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The challenge of paper sludge disposal has become an important environmental issue; therefore, the combustion characteristics of paper sludge need to be examined. In this paper, the combustion of paper sludge particles under different atmospheres was analysed and investigated using a flat flame burner and optical observation techniques under fast temperature rise conditions. The combustion of paper sludge could be divided into a preheating stage, volatile combustion stage, and coke combustion stage. The changes in oxygen content had different effects on the different stages of combustion. The increase in oxygen content had no significant impact on the ignition time of the sludge particles; however, the flame brightness significantly increased. The CH* free radical appeared in the most intense stage of combustion and was depleted before the volatile flame disappeared. A higher oxygen content correlated to a faster CH* depletion. The influence of the oxygen content on the combustion rate and burnout degree of the sludge particles was investigated by comparing mass loss data and heating data. The maximum temperature and heating rate also increased with increasing oxygen content. The reduced oxygen concentration could not fully penetrate the ash layer on the surface of the particles and react with the interior sludge, resulting in a lesser degree of sludge particle burnout. [ABSTRACT FROM AUTHOR]

There is growing global concern regarding the detrimental health impacts of PM2.5 emissions from traditional stoves that utilize polluting fuels. Conventional methods for estimating daily personal PM2.5 exposure involve personal air samplers and measuring devices placed in a waist pouch, but these instruments are cumbersome and inconvenient. To address this issue, we developed a novel neck-mounted PM2.5 monitoring device (Pocket PM2.5 Logger) that is compact, lightweight, and can operate continuously for 1 week without recharging. Twelve participants who utilized charcoal, firewood, or propane gas for cooking in rural regions of Rwanda wore the Pocket PM2.5 Logger continuously for 1 week, and time-series variations in personal PM2.5 exposure were recorded at 5-min intervals. Individual daily exposure concentrations during cooking differed significantly among users of the different fuel types, and PM2.5 exposure was at least 2.6 and 3.4 times higher for charcoal and firewood users, respectively, than for propane gas users. Therefore, switching from biomass fuels to propane gas would reduce daily individual exposure by at least one-third. An analysis of cooking times showed that the median cooking time per meal was 30 min; however, half the participants cooked for 1.5 h per meal, and one-third cooked for over 4.5 h per meal. Reducing these extremely long cooking times would reduce exposure with all fuel types. The Pocket PM2.5 Logger facilitates the comprehensive assessment of personal PM2.5 exposure dynamics and is beneficial for the development of intervention strategies targeting household air pollution. [ABSTRACT FROM AUTHOR]

The synergistic alkali metals fixation potential of Oxygen Carrier Aided Combustion (OCAC) technology has attracted increasing attention. Using the tailings from natural ilmenite after titanium extraction and its individual components Fe2TiO5 and TiO2 as absorbents, and KCl and CH3COOK as simulated alkali sources, the high-temperature absorption characteristics of alkali metal potassium by ilmenite tailings were studied in a static absorption experimental setup. The effects of various factors such as time, particle size, temperature, mass ratio, and gas-solid components on the absorption performance were systematically investigated. Techniques such as X-ray diffraction, inductively coupled plasma optical emission spectrometry scanning electron microscopy and X-ray energy dispersive spectroscopy were used to reveal the micro-mechanisms of K enrichment on the surface and bulk phase migration within ilmenite. The results show that ilmenite tailings possess good potassium absorption capabilities at high temperatures, with the absorption rate displaying a trend of rapid increase followed by a slow decline over time. Under certain conditions, reducing particle size, increasing reaction temperature, and the concentration of K in the gas phase can further enhance the alkali fixation performance of ilmenite tailings. At the temperatures and alkali metal concentrations like those of actual industrial flue gases, ilmenite tailings can achieve a K capture rate of over 40%. The primary phase of ilmenite tailings has a unique lamellar structure composed of iron-rich and titanium-rich layers arranged alternately. Compared to single-component model substances, it has a more complex morphology and superior alkali fixation capabilities. The process involves an initial deposition of K on the ilmenite surface, forming an enriched layer, followed by a solid-phase diffusion inward and migration deep into the particle along the titanium-rich layers. Fe in the titanium-rich layers migrates synchronously outward, doubly impacting the absorption of K in ilmenite. Additionally, Cl can further promote the absorption of K in ilmenite by reacting with Fe on the surface to form volatile FeCl2. Minerals such as almandine calcian in ilmenite tailings also show a significant synergistic absorption of K. The findings further confirm the synergistic alkali metals fixation potential of OCAC technology, while also offering new insights into the resource utilization of low-grade ilmenite.

As the Ethiopian energy demand urges for fuel options, it is essential to identify biomass fuels and estimate their energy potential. This study quantified the agricultural residues' biomass resources and their energy potential. Further analyzed and characterized the potential nature through quantitative and qualitative methodologies with descriptive, comparative, explanatory, and exploratory studies. Five-year crop yield data of 27 crops were collected from the Central Statistical Agency of Ethiopia. Conversion factors into energy were surveyed from the literature. Subsequently, the residues available and their energy potentials were estimated. Mathematical and statistical analysis methods were considered in an Excel sheet. A new measure of natural potential capacity for energy was defined in two views (resource and application). Accordingly, their potential capacities were rated and prioritized comparatively. The gross energy potential of all the residues was estimated to be 494.7 PJ. With 30% collecting efficiency, it corresponds to the imported petroleum fuel in 2018. Five major crops contributed to 80% of this gross potential. Maize and sorghum presented the highest potential due to their superior yields and good natural potential capacities. They are also well distributed in all the regions. Cotton and maize's natural potential capacities are the best in both views. Generally, commercial crops presented better capacities than the major cereal crops. However, major crops' energy potentials dominated due to their yields. These resources need mobilization into modern and commercially accessible fuel forms that await intervention. Densified and carbonized forms of consumption in nearby industries and households are most viable for the Ethiopian case. [ABSTRACT FROM AUTHOR]

Biochar, a solid material derived from a thermochemical process, has received significant attention due to its usefulness in various sectors. Previous studies have been conducted to improve the properties and quality of this material by altering the thermochemical processes, treating the feedstock, hybridizing the feedstock, and so forth, but little has been done on the effect of varying the reactor's configuration. This research aims to study the effect of varying the stainless‐steel‐based combustion compartment volume of a biomass‐fueled top‐lit updraft gasifier on the groundnut shell biochar. The biochar yields for reactors ranged from 34.9% to 51.2%. The sample produced in the smallest combustion compartment volume showed the highest carbon content, according to energy dispersive X‐ray spectroscopy (EDX) analysis. Potassium, another major element, decreased as the combustion compartment was reduced. Scanning electron microscopy (SEM) analysis revealed that the biochar samples produced had an irregular shape and rough surfaces, and reducing the combustion compartment volume resulted in larger particles on the surface. Fourier transform infrared (FTIR) spectroscopy analysis showed similarities and differences in peaks observed for all the samples. The biochar samples produced can find applications in wastewater treatment, energy conversion and storage, and soil amendment, and the findings contribute to the design and optimization of biomass‐based gasifiers. [ABSTRACT FROM AUTHOR]

In Eswatini, 62.3% of households still rely on solid fuel for cooking, especially wood (61.8%). Smoke emissions during biomass burning remain the primary source of indoor air pollution, comprising pollutants detrimental to health. This study provides a quantitative exposure assessment of fuels used in the Shiselweni region with the objectives of monitoring the carbon monoxide (CO) and carbon dioxide (CO2) concentrations during cooking events and evaluating cancer and noncancer risks due to exposure to particulate-bound polycyclic aromatic hydrocarbons (PAHs) during cooking events among cooking personnel in households that cook indoors by burning biomass. Real-time CO, CO2, and particulate matter (PM) monitoring was performed in seventeen kitchens during cooking events across the Shiselweni region using different cooking methods: biomass in open fires and stoves, liquefied petroleum gas (LPG), and electric stoves. PM2.5, PM10, and CO exceeded indoor exposure guidelines for biomass fuel-related homesteads. Particulate PAH intake concentrations were evaluated, and biomass fuel users exhibited high cancer risks and low embryo survival chances due to particulate PAH exposure. The average total cost of reducing the incremental lifetime cancer risk (ILCR) and hazard quotient (HQ) to acceptable levels was lower when shifting from biomass to LPG stoves than when shifting to electric stoves. [ABSTRACT FROM AUTHOR]

The carboxylic multi-walled carbon nanotube-loaded nickel (Ni/c-MWCNT) catalyst prepared by the excess impregnation method was used for the hydrogenation of oleoresin-based turpentine (OBT) into high energy density fuel. Benefiting from small nickel nanoparticle sizes (about 10 nm) and the carrier's high surface area, a hydrogenation rate of 99.1% was achieved at 145 °C and 3 MPa, superior to a commercial 5 wt.% Pd/C. Hydrogenated oleoresin-based turpentine (HOBT) satisfied the density, flash point, and freezing point outlined by the American Society of Testing and Materials standard. Hydrogenation improved the oxidative stability, smoke point, and calorific value of OBT while changing its color to water white. The impact of blend ratio on the blended biomass fuel performance was evaluated by measuring the smoke point, density, kinematic viscosity, calorific value, freezing point, and flash point of biofuels blended with HOBT and exo-tetrahydrodicyclopentadiene (JP-10). When HOBT was blended up to 20% (v/v) with JP-10, the performance of blended biomass fuel was comparable to that of JP-10 and even superior at freezing temperatures. [ABSTRACT FROM AUTHOR]

Abstract Legal reserve areas (LRAs) are a fundamental part of the Brazilian conservation strategy, together with permanent preservation areas. The LRAs are intended to maintain biodiversity and can be managed sustainably. When these areas are home to ecosystems that depend on fire and grazing, such as native grasslands and savannas, management practices that are suitable for their conservation and for dealing with the effects of global climate change should be adopted. However, this subject is still poorly discussed in Brazil, and public policies are not clear on this matter. This review article describes the grassland and savanna ecosystems in Brazil, the legal aspects related to the management of LRAs, the current and future climate scenarios, and the relationship between climate and fire risk. It also presents a review about the use of fire and grazing in grassland and savanna ecosystems, the legal challenges related to their application in LRAs, and the use of geotechnologies to monitor these practices. The conclusion is that grazing and fire, as management tools, are adequate for LRA functions, as long as they are practiced in accordance with legal and scientifically based standards to avoid the negative effects of their incorrect use.

The domestic utilization of biomass fuel for purposes such as cooking, space heating, and water heating has been linked to a number of respiratory ailments, particularly when burned inefficiently. However, there is an existing knowledge gap on the impact of this practice on the health of Basotho. This study aims to explore the impact of biomass fuels use on the prevalence of respiratory illnesses among residents of two rural communities in Thaba-Tseka. A quantitative, cross-sectional design was adopted, using a structured questionnaire, to assess the correlation between biomass fuel use and the prevalence of respiratory symptoms and diseases. Data were collected from 326 randomly selected individuals aged 18 and above. The major source of fuel energy used was firewood (39.6 %), followed by paraffin (29.1 %) and animal dung (15.6 %). The most prevalent respiratory symptom reported was cough, among 27.6 % of participants (n = 326), followed by sneezing (n = 326, 23.0 %), and fever (n = 326, 17.5 %). The lowest prevalent respiratory disease was pneumonia (0.9 %) while lung cancer was not reported. The reporting of respiratory symptoms and diseases was most prevalent in January. A greater prevalence of cough was reported by participants with a higher level of education (r (5) = 1.746, p = 0.008). More male participants reported to have tuberculosis (7.8 %) compared to females (3 %) (r (1) = 3.809, p = 0.051). Asthma was noted to be more prevalent among high income earners (r (3) = 8.169, p = 0.043) and those reported to have an employment (r (1) = 4.277, p = 0.039). Surprisingly, there was no association between respiratory diseases and symptoms, and the type of domestic fuel used. In the rural communities of Thaba-Tseka, about 4 in 10 Basotho rural communities, relied on firewood for cooking, space heating and water heating. Respiratory symptoms and diseases were observed mostly in the month of January. Several factors, including education level, marital status, gender, and income level, were significantly associated with specific respiratory symptoms and diseases. Targeted public health interventions are urgently needed to mitigate respiratory symptoms and diseases in the rural communities of Lesotho. More focus should be directed to health behavioral change and provision of improved stoves for exposure reduction of biomass emissions.

Abstract Background Chronic obstructive pulmonary disease (COPD) is the third leading cause of death worldwide among people over 40 years of age, and erythrocytosis is one of the major complications associated with increased mortality among COPD patients. The study aimed to determine the proportion of COPD, associated factors, and the burden of erythrocytosis among COPD participants. Methods and materials A descriptive cross-sectional study design was used. A consecutive sampling technique was used to obtain study participants at the Fort Portal Regional Referral Hospital outpatient clinic. Focused history and physical examination were carried out to select eligible participants. Participants were screened using the COPD population screener for spirometry after consenting to participate. The study enrolled all adults at risk of having COPD based on the COPD population screener and able to undergo spirometry. Spirometry was carried out according to the Global Chronic Obstructive Lung Disease and European Respiratory Society guidelines, and haemoglobin concentration was measured. Results One hundred eighty participants were enrolled in the study, most of whom were females. The modal and mean age of participants was 60 years with 139 (77.2%) females and primary as the highest education level 149(82.8%). The proportion of COPD was 25% (45) [95% CI 18.9 – 32] and highest among females (68.9%) and those aged 60 years and above (70%). The combined COPD assessment tool groups had a proportion of 55.6%, 37.8%, 4.4%, and 2.2% for groups A, B, C, and D, respectively. Age

The performance of two solid biomass wastes, date stone and jojoba solid waste, was experimentally examined for their potential application in combustion and propulsion systems. The fuels were tested in a hybrid rocket-like combustion environment, and the test result was analyzed with combustion and propulsion parameters. The performance of both fuels was comparatively evaluated and compared with a conventional hydrocarbon fuel in a hybrid rocket, with paraffin wax serving as a baseline. A compression device was introduced to compress the solid biomass wastes into a circular-shaped fuel grain compatible with a hybrid rocket combustion chamber with a hot surface ignitor. Thermogravimetric analysis (TGA) and chemical equilibrium analysis (CEA) results revealed that the performance of the biomass fuel can be comparable to conventionally used hydrocarbon paraffin-wax-based propellant within a certain range of oxidizer-to-fuel ratio, in terms of theoretical specific impulse performance. Through experimental performance tests, it was found that the compressed biomass fuel grains were successfully ignited and produced thrust. Both biomass fuels tested in a hybrid rocket combustion chamber are expected to pave the way for further developments in biomass fuels in the waste-to-energy field for their application in combustion and propulsion systems, potentially replacing fossil fuels with renewable resources. [ABSTRACT FROM AUTHOR]

With increased awareness of the large-scale CO2 emissions from the cement industry, there has been growing focus on greenhouse gas reduction strategies. Among all these strategies, fuel substitution using biomass fuel is extensively used to achieve CO2 zero-emission in cement production. Due to the avoidable high-temperature-generated thermal nitrogen oxides during cement production, research on the impact of biomass application on nitrogen oxide emissions shall be carried out. Three types of biomass fuel and bituminous coal were used to investigate the NO reduction characteristics under different O2 concentrations on experimental benches. It was found that the change in oxygen concentration from 9% to 1% increased the reaction time in the reactor from 555 s to 1425 s, which means the increase in oxygen concentration can lead to shorter reaction time, and correspondingly, the existing time of nitric oxide in the flue gas is also shortened, but the peak value of nitric oxide rises, during the process of O2 concentration changing from 1% to 9%, the peak NO concentration in the flue gas increased from 5.4×10−5 to 1.05×10−4. An increase in O2 concentration greatly reduces the total reduction of NO and the minimum change in NO concentration. The peak NO concentration during the combustion process of corn stalk is 4.56 ×10−4, which is approximately 7 times higher than that of coal, and it is caused by the high amount of N in corn stalk. The addition of raw meal has an inhibitory effect on the reduction of NO: after adding raw meal, the effective reduction time of NO by fuel decreased by about 20%, but adding raw meal raises CO2 concentration of fuel gas in the early stage of reaction. [ABSTRACT FROM AUTHOR]

Reliance on biomass fuel remains high in many developing countries, like India. Shifting to clean fuel has widely recognized benefits for women in saving time, improving health, and creating a better environment. Other benefits to women in the form of increasing empowerment are a relatively under‐researched area. Using data from the nationally representative National Family Health Survey (2019–21) in India, this study uses endogenous treatment effect models to explore the causal effect of shifting to clean fuel on awareness, work, mobility, decision‐making and financial autonomy. Analysis reveals significant gains in all dimensions, particularly in women's mobility and decision‐making. The gains are relatively higher among less educated women, those from poor households, and those belonging to socially advantaged groups. Focusing on gains to empowerment will motivate women to adopt clean fuel and enable a holistic transformation of society through the simultaneous attainment of several Sustainable Development Goals. [ABSTRACT FROM AUTHOR]

The utilization of isopropanol-butanol-ethanol (IBE) to clean energy effectively mitigated the problems of environmental pollution and sustainable energy regeneration. In order to improve the utilization efficiency of ethanol and isopropanol in IBE, a liquid double-layer porous media burner was designed. And the combustion characteristics with different porous pellets and isopropanol ratios were studied. The results indicated that the mole fraction of hydrogen decreased with the increasing pellet diameter, and the lower heating value of syngas reached the highest value of 82.0 MJ/Nm3 when the pellets possessed two holes. Meanwhile, the peak temperature reached the maximum of 1009 K when the water content was 20% due to the sufficient combustion. And the isopropanol was conducive to the improvement of the total energy conversion efficiency. In addition, the yields of hydrogen and carbon monoxide were improved by 23.7% and 30.5% when the velocity increased from 10 to 12 cm/s. These results showed that the combustion of ethanol and isopropanol in porous media burners achieved the sustainable production of hydrogen and efficient utilization of IBE biofuels. [Display omitted] • Isopropanol and ethanol were combined with porous media for hydrogen production. • Hydrogen production was greatly improved with isopropanol addition than n-propanol. • 15% isopropanol and 85% ethanol obtained the energy conversion efficiency of 96.0%. • Increasing the hole number in porous pellet reduced the combustion temperature. [ABSTRACT FROM AUTHOR]

The usage of fossil fuels such as coal is now being reduced and shifted to bio-fuel in the boilers. It is because fossil fuels are exhaustible and generate CO2 emission during burning. Whereas, bio-fuels are abundantly available at low cost and also produce fewer greenhouse gases. However, burning of such fuels create a lot of corrosive species which can damage the components used for construction of boilers. Ferritic, austenitic, and martensitic steels are widely used to construct various parts of the boiler. Hence, in this study, four different grades of steels known as T91, SS304, SS316, and SS410 have been placed in the actual boiler environment for 493h. The boiler utilizes wood chips, rice husk, sawdust, bamboo base and leaf cuttings as burning fuel and operates at 850±50∘C. The results indicate that T91 steel showed a maximum rate of corrosion followed by SS304, SS316, and SS410. Martensitic steel 410 showed the minimum loss in weight among other steels. No intergranular corrosion was noticed in 410 steel, but the oxide so formed on the surface was fragile and porous although the chromium content is less in SS410 as compared to SS304 and SS316. [ABSTRACT FROM AUTHOR]

IntroductionExposure to indoor air pollution such as biomass fuel and particulate matter is a significant cause of adverse pregnancy outcomes. However, there is limited information about the association between indoor air pollution exposure and adverse pregnancy outcomes in low and middle-income countries. Therefore, this meta-analysis aimed to determine the association between indoor air pollution exposure and adverse pregnancy outcomes in low and middle-income countries.MethodsInternational electronic databases such as PubMed, Science Direct, Global Health, African Journals Online, HINARI, Semantic Scholar, and Google and Google Scholar were used to search for relevant articles. The study was conducted according to the updated Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. A random effect model at a 95% confidence interval was used to determine the association between indoor air pollution exposure and adverse pregnancy outcomes using STATA version 14. Funnel plot and Higgs I2 statistics were used to determine the publication bias and heterogeneity of the included studies, respectively.ResultsA total of 30 articles with 2,120,228 study participants were included in this meta-analysis. The pooled association between indoor air pollution exposure and at least one adverse pregnancy outcome was 15.5% (95%CI: 12.6–18.5), with significant heterogeneity (I2 = 100%; p < 0.001). Exposure to indoor air pollution increased the risk of small for gestational age by 23.7% (95%CI: 8.2–39.3) followed by low birth weight (17.7%; 95%CI: 12.9–22.5). Exposure to biomass fuel (OR = 1.16; 95%CI: 1.12–1.2), particulate matter (OR = 1.28; 95%CI: 1.25–1.31), and kerosene (OR = 1.38; 95%CI: 1.09–1.66) were factors associated with developing at least one adverse pregnancy outcomes.ConclusionsWe found that more than one in seven pregnant women exposed to indoor air pollution had at least one adverse pregnancy outcome. Specifically, exposure to particulate matter, biomass fuel, and kerosene were determinant factors for developing at least one adverse pregnancy outcome. Therefore, urgent comprehensive health intervention should be implemented in the area to reduce adverse pregnancy outcomes.

As the Ethiopian energy demand urges for fuel options, it is essential to identify biomass fuels and estimate their energy potential. This study quantified the agricultural residues’ biomass resources and their energy potential. Further analyzed and characterized the potential nature through quantitative and qualitative methodologies with descriptive, comparative, explanatory, and exploratory studies. Five-year crop yield data of 27 crops were collected from the Central Statistical Agency of Ethiopia. Conversion factors into energy were surveyed from the literature. Subsequently, the residues available and their energy potentials were estimated. Mathematical and statistical analysis methods were considered in an Excel sheet. A new measure of natural potential capacity for energy was defined in two views (resource and application). Accordingly, their potential capacities were rated and prioritized comparatively. The gross energy potential of all the residues was estimated to be 494.7 PJ. With 30% collecting efficiency, it corresponds to the imported petroleum fuel in 2018. Five major crops contributed to 80% of this gross potential. Maize and sorghum presented the highest potential due to their superior yields and good natural potential capacities. They are also well distributed in all the regions. Cotton and maize’s natural potential capacities are the best in both views. Generally, commercial crops presented better capacities than the major cereal crops. However, major crops’ energy potentials dominated due to their yields. These resources need mobilization into modern and commercially accessible fuel forms that await intervention. Densified and carbonized forms of consumption in nearby industries and households are most viable for the Ethiopian case.

Introduction: Biomass Fuels (BMF) used for daily cooking in developing countries inside home is the highest exposures to air pollutants. Inhalation of these pollutants causes harmful health effects. This study aims to assess the health effects with the indoor air pollutants generated BMF. Materials and methods: A cross-sectional study, conducted in a rural village of India. 450 households were divided into two groups based on the cooking fuel, the BMF group and the Liquefied Petroleum Gas (LPG) clean fuel group. Socioeconomic and respiratory symptoms information was obtained using a standard questionnaire. Indoor air concentration for PM10 and PM2.5 was measured during cooking hours. Pulmonary Function Tests (PFTs) were conducted for the women inhabitants using spirometer. Results: Respiratory symptoms like chest pain, breathlessness, eye irritation, and blackout found to be significantly higher in biomass users (P

The present study highlights the differences/similarities in the sinter's microstructure that are essentially caused due to the adjustment in the fuel framework. In general, sintering draws energy from fuel to initiate the melt phase formation which is significant for sinter bond formation. Thus, it is possible that changing the fuel and its proportion may reflect various phenomena while sintering, and that can propagate changes in the mineralogy, morphology and subsequently the sinter strength and metallurgical properties. Here, two types of sinters (a) conventional coke based sinter and (b) biomass-coke blend based sinter at 70:30 ratio are assessed based on the comparative investigation of the microstructural and morphological aspects, which further relate to the sinter indices. Sinters are characterized for acquiring its internal chemistry, phase transitions, phase identification, textural transformations, bond phase distribution, elemental distribution, and metallurgical indices. The findings are similar for both the sinter types that concluded the technical feasibility of the biomass blend based sinters. When biomass proportion went higher than 30%, the extent of phase transition started to subside, and some unreacted hematite phases started to surface as the effect of under-heating. Although, 30% coke substitution with biomass feasibly ensured a cleaner sinter production with energy sustainability without compromising the internal chemistry nexus. [ABSTRACT FROM AUTHOR]

Smoky cookfires contribute to global climate change and kill approximately four million people annually. While many studies have examined the effects of fuel-efficient cookstoves, this study does so while selling stoves at market prices. After introducing a fuel-efficient cookstove, fuelwood use and household air particu-lates declined by 12% and by smaller percentages after adjusting for observer-induced bias, or the Hawthorne effect. These reductions were less than laboratory predictions and fell well short of World Health Organization pollution targets. Even when introducing a second stove, most households continued to use their traditional stoves for most cooking. Future research should focus on improving the usability of fuel-efficient cookstoves and/or policies that assist consumers to shift to safer fuels like gas or electricity coupled with mechanisms to disable the existing smoky cookfire. [ABSTRACT FROM AUTHOR]

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BackgroundCombustion of solid biomass fuels using traditional stoves which is the daily routine for 3 billion people emits various air pollutants including fine particulate matter which is one of the widely recognized risk factors for various cardiorespiratory and other health problems. But, there is only limited evidences of kitchen PM2.5 concentrations in rural Ethiopia.ObjectiveThis study is aimed to estimate the 24-h average kitchen area concentrations of PM2.5 and to identify associated factors in rural households of northwest Ethiopia.MethodThe average kitchen area PM2.5 concentrations were measured using a low-cost light-scattering Particle and Temperature Sensor Plus (PATS+) for a 24-h sampling period. Data from the PATS+ was downloaded in electronic form for further analysis. Other characteristics were collected using face-to-face interviews. Independent sample t-test and one-way analysis of variance were used to test differences in PM2.5 concentrations between and among various characteristics, respectively.ResultMixed fuels were the most common cooking biomass fuel. The 24-h average kitchen PM2.5 concentrations was estimated to be 405 μg/m3, ranging from 52 to 965 μg/m3. The average concentrations were 639 vs. 336 μg/m3 (p

The use of pili shells as fuel in a biomass roasting furnace for roasting meat was investigated in this study. To estimate the capacity of pili shells in roasting meat, researchers used observation, experimentation, data analysis, and interpretation. Pili shells as a fuel were found to be a good substitute for roasting. Pili shells are more effective than an electric oven, according to the researchers. More research into the qualities and components of pili nutshells is needed to establish the treatment required before they may be utilized as fuel. Increased pressure has an effect on torrefaction metrics such as mass yields, energy densification ratio, energy yield, process energy consumption, the proximate analysis, high heating value.

Objectives: To assess the exposure of indoor respirable suspended particulate matters (PM10, PM2.5, and PM1) and their association with asthma in children in a rural area of Delhi-NCR. Methods: It was a cross-sectional study. Fifty children with asthma from both biomass fuel users in group A and liquefied petroleum gas (LPG) fuel users in group B households were enrolled along with 50 healthy control subjects. The diagnosis of asthma was done as per the Global Initiative for Asthma (GINA), 2014. The 24-h levels of PM from all three groups of households were measured and compared. The level of PM with confounding factors like smoking and room occupancy was also compared between the groups. Results: The 24-h concentrations of PM10, PM2.5, and PM1 were found significantly higher in the households of group A and group B as opposed to group C (p < 0.001). The number of smokers with a mean pack year and a lack of an exhaust fan was highest in group A and lowest in group C, while diesel and kerosene machines were highest in group B. The PMs were highest in group A even with different confounding factor (p < 0.001). The level of all PM was higher in group B than in group C, despite the presence of both types of fuel in group C households. The level of all PM was highest during the cooking hour. Conclusion: The level of 24-h PM was highest in group-A households. However, the level of PM was higher in group-B households than group C despite the presence of biomass fuel users in group C. This may be due to the higher number of smokers, poor room-occupancy and lack of exhaust fans. [ABSTRACT FROM AUTHOR]

Abstract Background Worldwide, around 3 billion people rely on solid fuel for their daily energy needs. Household air pollution secondary to solid fuel burning is a major risk factor for respiratory mobility among vulnerable populations. This study aimed to investigate the respiratory symptoms associated with solid fuel usage, the level of kitchen fuel smoke exposure and its association with respiratory symptoms among reproductive-aged women in Sri Lanka, where most households exclusively use firewood as the primary cooking fuel. Methods A descriptive cross-sectional study was conducted among 403 reproductive-aged women (15 to 49 years) in the Central Province, Sri Lanka. A structured interviewer-administered questionnaire was used to collect data, and an exposure assessment was done using a breath carbon monoxide monitor. Results After adjusting for potential confounding factors by the logistic regression models, the odds ratios (OR) of the liquid petroleum gas-only users for at least one respiratory symptom relevant to cough (OR: 0.39; 95% confidence interval [CI]: 0.20–0.78), wheezing (OR: 0.47; 95% [CI]: 0.26–0.87), and dyspnea (OR: 0.44; 95% CI: 0.24–0.84) were significantly lower compared to firewood-only users. The mean of expired air carbon monoxide and estimated carboxyhemoglobin levels of liquid petroleum gas-only users (2.84 ± 2.85 ppm; 1.08 ± 0.46%) were significantly lower than those of firewood-only users (5.27 ± 4.64 ppm; 1.47 ± 0.74%). Conclusions The use of firewood increased the risk of respiratory symptoms among reproductive-aged women in Sri Lanka. Health education focused on positive behavioral changes and effective and efficient clean energy policies are recommended to mitigate the risk associated with solid fuel smoke exposure.

Wood biomass is an alternative to fossil fuels. However, biomass use has several limitations. Torrefaction, in which reduction conditions prevail to overcome these limitations, has been suggested. Here, torrefaction using different wood chips (Liriodendron tulipifera, Populus canadensis, Pinus rigida, and Pinus koraiensis) was conducted under oxygen-rich and oxygen-lean conditions to determine the effects of oxygen. Torrefaction was conducted at 230–310 °C for 1 h. A mass yield difference of 3.53–20.02% p (percentage point) was observed between oxygen-lean and oxygen-rich conditions. The calorific value increased by a maximum of 50.95% and 48.48% under oxygen-rich and oxygen-lean conditions, respectively. Decarbonization (DC), dehydrogenation (DH), and deoxygenation (DO) occurred in the following order because of dehydration and devolatilization during biomass torrefaction: DO > DH > DC. The calorific value of the torrefied biomass increased linearly with the extent of all three processes. The combustibility index and volatile ignitability were calculated based on proximate composition to suggest the optimal conditions for replacing anthracite and bituminous coal. This study provides suggestions for stable operation in a standard boiler design. [ABSTRACT FROM AUTHOR]

This paper focuses on the combustion mechanism of furan-based fuels synthesized from lignocellulose. The fuel is a binary alternative fuel consisting of 2-methylfuran and 2,5-dimethylfuran derived from furfural. The key reactions affecting the combustion mechanism of this fuel were identified via path analysis, and the initial reaction kinetic mechanism was constructed using a decoupling methodology. Then, a genetic algorithm was used to optimize the initial mechanism. The final skeleton mechanism consisted of 67 species and 228 reactions. By comparing experimental data on ignition delay, component concentration, and laminar flame velocity under a wide range of conditions over various fundamental reactors, it was shown that the mechanism has the ability to predict the combustion process of this fuel well. [ABSTRACT FROM AUTHOR]

Biomass wastes originating from palm oil milling activities can be characterized by their high biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS), and oil and grease content. The utilization of oil palm wastes such as palm oil mill effluent (POME) and empty fruit bunch (EFB) has great potential for a sustainable energy biomass pellet as it reduces the reliance on conventional materials for energy production. A mixture of POME and EFB in various ratios ranging between 7:3, 8:2, 9:1, and 10:0 was fermented in the presence of Lysinibacillus sp. LC 556247 for 120 h at 37 ± 2 °C and 180 rpm with the aim of elucidating the biodegradation of complex organic material in terms of BOD, COD, TSS, total organic carbon, inorganic carbon, and total carbon content. After fermentation, the mixtures were oven dried at 105 °C overnight and then subjected to calorific energy value (CEV) determination. The highest CEV of 20.26 MJ/kg was achieved for a ratio of 10:0 (slightly higher than the control experiment with the value of 18.67 MJ/kg), with maximum removal efficiencies of COD (12.19%), BOD (11.72%), TSS (93.94%), and oil reduction of 17.43%. The addition of EFB did not positively increase the CEV. [ABSTRACT FROM AUTHOR]

The combustion of solid fuels in a combustion chamber can be perfect if all the fuel included can burn out, and nothing remains. The combustion chamber requires sufficient air to burn all the fuel; therefore, meeting the air supply requires modifications with various considerations. The perforated plate modeled through computational fluid dynamics (CFD) was modified to investigate the excess air supply into the combustion chamber. The CFD simulation modeled in this study was used to validate the results of the experiments carried out with the previous fluidized-bed combustor technology. The simulation results show that the temperature increased for all fuels tested in geometry-2 compared with geometry-1. The best boiler efficiency from the simulation results is in geometry-1 for 45% oil palm midrib fuel with a mass flow rate of 7.78 kg/s. The maximum radiation was recorded from geometry-2 at a variation of 66.939 W/m2, with a heat loss level of 1.10 W/m2. Overall, the simulation was performed by modifying the fuel floor plate in geometry-2 to increase the temperature and radiation with lower heat loss.

Background: We conducted a clean fuel intervention trial (Bangladesh Global Environmental and Occupational Health (GEOHealth) (NCT02824237) with liquefied petroleum gas (LPG) for 26 months among rural Bangladeshi women chronically exposed to household air pollution (HAP) from biomass fuel (BMF) use. We aimed to evaluate the effect of HAP reduction following LPG intervention on immune response outcome. Methods: We supplied LPG cook stove and refills in cylinder in 200 households for 26 months. We measured personal exposure to HAP [particulate matter 2.5 (PM2·5), black carbon (BC) and carbon monoxide (CO)] in 200 women (main cook) by personal monitors at pre- and post-intervention. Immune function was assessed before and after intervention, in blood collected within 2 weeks of HAP measurements. Primary endpoints included reduction in HAP, lymphocyte proliferation and oxidative stress response, and alterations in T and B cell proportions. Findings: Exclusive LPG use for 26 months resulted in significant reduction in PM2·5 (43.5%), BC (13%) and CO (48%) exposure in the women. For one unit decrease in BC, Treg cells and memory B cells increased by 7% and 34% respectively, in the peripheral circulation. One unit decrease in CO was significantly associated with increase in early B cells and plasmablasts by 66% and 5% respectively. For one unit decrease in BC, percent-dividing cells, proliferation and expansion indices increased by 2%, 0.4%, and 1%, respectively. Interpretation: Reduced personal exposure to HAP through clean fuel intervention was related to a return towards cellular immune balance.

The performance of two solid biomass wastes, date stone and jojoba solid waste, was experimentally examined for their potential application in combustion and propulsion systems. The fuels were tested in a hybrid rocket-like combustion environment, and the test result was analyzed with combustion and propulsion parameters. The performance of both fuels was comparatively evaluated and compared with a conventional hydrocarbon fuel in a hybrid rocket, with paraffin wax serving as a baseline. A compression device was introduced to compress the solid biomass wastes into a circular-shaped fuel grain compatible with a hybrid rocket combustion chamber with a hot surface ignitor. Thermogravimetric analysis (TGA) and chemical equilibrium analysis (CEA) results revealed that the performance of the biomass fuel can be comparable to conventionally used hydrocarbon paraffin-wax-based propellant within a certain range of oxidizer-to-fuel ratio, in terms of theoretical specific impulse performance. Through experimental performance tests, it was found that the compressed biomass fuel grains were successfully ignited and produced thrust. Both biomass fuels tested in a hybrid rocket combustion chamber are expected to pave the way for further developments in biomass fuels in the waste-to-energy field for their application in combustion and propulsion systems, potentially replacing fossil fuels with renewable resources.

This paper proposes a new technical route of solar-biomass assisted thermophotovoltaic (TPV) system for power generation which uses renewable fuel and contributes to carbon neutrality. Here, a thermophysics model is established for solar-biomass assisted TPV based on energy-balance principle. The effects of some key parameters on the new system performance are investigated, including concentrate ratio, emitter area, biomass fuels, etc. Besides, biomass fuel saving after adding solar energy is investigated. The results show that the solar-biomass assisted TPV system can not only increase the output power of photovoltaic cells by more than 10 kW/m2 compared to biomass-driven TPV but also increase the electrical efficiency by nearly 10 percentage points. It is pointed out that improving the absorptance of solar absorber is the key for system optimization. Furthermore, the annual performance analysis shows that it also saves biomass fuel by up to 60% in one year. This study provides a reference for the design and application of renewable TPV technology.

Most households in low- and middle-income countries (LMICs) rely on biomass fuel for daily cooking. Studies investigating the association between early life exposure to household air pollution and health outcomes in children in LMICs are limited. To investigate the effects of biomass fuel for cooking and different types of stoves on wheeze and allergies in children of rural Sri Lankan communities. A cross-sectional study was conducted on 452 children aged 5 years and younger in Kandy, Sri Lanka. Mothers completed a questionnaire on the use of biomass fuel and respiratory and allergic outcomes in children. The associations between biomass fuel and outcomes were analyzed using logistic regression models, adjusting for potential confounders. Use of biomass fuel for cooking was associated with increased risk of childhood wheeze (aOR 2.29; 95% CI 1.04–5.08) and eczema (aOR 4.57; 95% CI 1.24–16.89) compared with households that used clean fuel (liquid petroleum gas (LPG), electricity and/or biogas). Among households that used biomass fuel, use of traditional biomass stoves was associated with a higher risk of childhood wheeze (aOR 2.95; 95% CI 1.19–7.33), allergic rhinitis (aOR 3.01; 95% CI 1.42–6.39), and eczema (aOR 7.39; 95% CI 1.70–32.06) compared with households that used clean stoves. Children living in households that use biomass fuel, especially traditional biomass cookstoves, have a higher risk of wheeze and allergic diseases. Access to affordable clean energy sources that reduce air pollution may help improve the health of children in rural LMICs. Supplemental data for this article is available online at at www.tandfonline.com/ijas. [ABSTRACT FROM AUTHOR]

Palm oil mill effluent (POME) is a potential alternative sources of biomass fuel upon phycoremediation treatment using microorganisms. In this study, Coccomyxa dispar and Scenedesmus parvus, as acidophilic microalgae, were used to investigate growth and the production of biomass fuel from the cultivation of POME, as well the effectiveness of removing contaminants from POME. Individual cultivation was conducted at 26 ± 3 °C for 14 days under three growth modes (mixotrophic, heterotrophic, and autotrophic). To elucidate the potential phycoremediation properties, the characteristics of treated POME were compared, such as optical density (OD), cell dry weight (CDW), calorific energy values (CEV), chemical oxygen demand (COD), biochemical oxygen demand (BOD), carbon, hydrogen, and nitrogen (CHN) elemental analysis, including oil and grease content. S. parvus exhibits an outstanding growth profile for all growth modes compared to C. dispar, with measurements of 228.8, 37.08, and 118.2 mg/L observed at day 14 of cultivation. The highest CEV is 32.30 MJ/kg, which was obtained from S. parvus in the mixotrophic mode. Maximum removal efficiency for COD and BOD was 81% and 19% in the mixotrophic growth mode with S. parvus. These results pinpoint that S. parvus has the potential to be utilized for biomass fuel production with high CEV and effective POME phycoremediation. [ABSTRACT FROM AUTHOR]

Background: Most of the households in developing countries burn biomass fuel in traditional stoves with incomplete combustion that leads to high indoor air pollution and acute respiratory infections. The use of Biomass fuels in household cooking contributes to indoor air pollution and is the cause of more than 4 million deaths around the world annually. Three billion people (more than 40% of the global population) are still dependent on Biomass fuels like firewood, dung cakes, coal, wood and agricultural residues in these countries. Material And Methods: Observational cross sectional study design was employed among Healthy adult Female relatives of new patient comes in Pulmonary medicine department between age of 20 to 60. A total of 120 healthy adult female were included in the study. Aim of the study is to evaluate Association between biomass fuel exposure and Respiratory function. Objectives of study are to assess respiratory function among women using biomass fuel & To Assess various types & severity of respiratory disorders among women using biomass fuel. Result: Of total 120 female participants, maximum number of participants belong to low to medium socioeconomic status and live in Rural areas. Almost 31% participants from High Biomass Index group of this study found Obstructive respiratory disorders. Present study revealed that approximately 55% participants had various respiratory complaints. Cough, Dyspnoea, Headache and wheeze were highly found in High Biomass exposure index group. Contrary to this, running nose and Sneezing were more commonly found in the Low biomass exposure index group. Conclusion: Exposure to Biomass fuels for cooking increases the potential risk of TB, COPD and bronchial asthma. Access to clean and efficient fuels for cooking is essential to reduce the burden of respiratory disease. Measures are needed to increase the availability of clean fuels for households, especially among socially disadvantaged and marginalized groups, to reduce the burden of respiratory diseases in India. [ABSTRACT FROM AUTHOR]

• A more comprehensive numerical model for the use of biochar in sintering process was proposed first which consider coke/biochar dual-fuel phase heat supply and their pyrolysis, volatiles release, and combustion processes and Nox emissions model is simultaneously coupled in the model. • ·The effects of equivalent fixed carbon method, biochar replacing proportion, and fuel type on sintering performance were systematically studied. • ·Using equivalent fixed carbon substitution and particle size optimization methods can improve the biochar substitution rate. • ·Relevant improvements may make numerical simulation unique in studies on multiple green sintering processes. For green production of iron ore sintering, the research on replacing traditional coke with clean energy such as biochar is a new hot topic. Most of the work conducted in biomass fuel utilization in sintering is done on a laboratory or pilot-scale. Little work was reported by using mathematical models to predict the influence of biomass-based fuel replacement on sintering performance quantitatively. In this paper, a more comprehensive numerical model that incorporates most of the significant reaction processes and heat transfer modes was proposed first, especially with considerations of coke/biochar dual-fuel phase heat supply and their pyrolysis, volatiles release, and combustion processes. Experimental data of the sintering pot reasonably agreed with the numerical results, which validated the model. Based on the equivalent fixed carbon method, the combustion and sintering behaviors in replacing proportions, particle size, and fuel types of commercial biochar for coke in the sintering bed were compared. With the lower replacement proportions (<20 %), both two biochars (Oak and Pine) can ensure thermal state indicators (PT, RT, MQI, CR) and combustion performance indicators (FFS and combustion efficiency), and keep the yield enough high. When the replacement proportion exceeds 50 %, the sintering index is worsened significantly. The emission of NO x can be decreased by 57.62 % when a 100 % replacement proportion of biochar is used. The results also indicate that coarsening particle size (2.4 mm was recommended for use) can further improve sintering indicators, and make Oak char 50 % replacing proportion reach the level of all coke method. The performance of pine sintering is even better than Oak sintering. The multiphase multicomponent model is used to give a mechanism explanation for the behavior and performance of biochar replacing coke in the sintering process. [ABSTRACT FROM AUTHOR]

Introduction: The WHO states that around 2.6 billion people still cook using solid fuels (such as wood, crop wastes, charcoal, coal, and dung) and kerosene in open fires and inefficient stoves. Evidence suggests that exposure to indoor air pollution by biomass fuel cooking is associated with chronic obstructive pulmonary disease, asthma, cardiovascular diseases, lung cancer, hypertension, depression, breast cancer, and cataract. This systematic review aims at providing evidence-based insight into indoor air pollution by comprehensively assessing the association of major noncommunicable diseases with the household air pollution from biomass solid fuel. Methods and Analysis: We will undertake a systematic search in PubMed, EMBASE, Scopus, OVID, MEDLINE, and Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library from January 2000 to April 2022. The study designs to be included will be cross-sectional, case-control, cohort, and randomized controlled trials. Subgroup analyses will be performed, and sensitivity analyses will be conducted to assess the robustness of the findings. Ethics and Dissemination: No ethical issues are foreseen. Dissemination will be done by submitting scientific articles to academic peer-reviewed journals. We will present the results at relevant conferences and meetings. Study Design: Systematic review and meta-analysis. Conclusion: This systematic review will collate empirical evidence to assess the association of NCDs with the household air pollution from biomass fuel. Prospero Registration: CRD42022356857.

Introduction: In India, about 90% of the rural population relied upon biomass fuels like animal dung, crop residues and wood. Women generally being involved in cooking are at higher risk of developing respiratory diseases following use of unclean fuels. Objective: The objective of the study is to assess the association of respiratory morbidity with different fuels and the duration of exposure in the women residing in the rural area of Maharashtra. Methodology: A community-based cross-sectional study was conducted in field practice area of the Department of Community Medicine of Government Medical College in Maharashtra. Total of 994 eligible subjects were included in the study and data was collected using predesigned structured questionnaire. Abnormal pulmonary function of the study subjects was assessed by the measurement of peak expiratory flow rate (PEFR). Statistical tests such as ANOVA, bivariate and multivariate analysis were used. Results: Out of 994 subjects, 725 (72.9%) subjects were using only biomass fuel and 120 (12.1%) were using only LPG for domestic purposes. Lowest mean PEFR was seen in mixed fuel users, that is, 284.09 (SD ± 64.83), followed by biomass fuel users, that is, 287.88 (SD ± 61.47). Respiratory morbidity was seen in 369 (38.1%) subjects with maximum morbidity in biomass users, that is, 262 (p < 0.001). Occurrence of respiratory symptoms like dyspnoea, cough and rhinitis was significantly higher amongst the subjects using biomass fuel, with P < 0.001. Bivariate and multivariate analysis showed that use of biomass fuel, age above 60 years and EI more than 90 had higher odds of having respiratory morbidity.Conclusion: The risk of developing respiratory morbidities is high in subjects using biomass fuel. Also, the occurrence of such morbid conditions depends on the higher age and longer duration of exposure to biomass smoke.

Abstract Background Indoor air pollution (IAP) remains a major global public health hazard more so in developing countries where use of fossil fuels is still very common. However, despite the popularity of kerosene and fuelwood as energy sources among many households in the Sub-Saharan Africa, little is known about their health effects and the predisposing factors particularly on those with direct exposure. This study sought to relate indoor air pollution exposure to self-reported prevalence of respiratory outcomes including (sputum production, congestion, breathing difficulties, eye problems, fatigue, and headaches and wheezing) among women and children of Trans Nzoia County, in the rural villages of western Kenya. Methods In this cross-sectional survey, simple random technique was used to select 251 households from 14 villages. Households were the sampling units, while the woman of the household with/or in custody of a child aged less than 5 years old were the unit of analysis. A total of 251 women with/or in custody of a child aged less than 5 years old took part in the study. A structured questionnaire was used to collect information on cause and effects of IAP among women and children. Data was analyzed descriptively and inferentially. We used Poisson generalized linear models with IAP symptoms and indoor cooking as dependent variables and household profiles and other socio-demographics as independent variables to identify the factors that affect health outcome. Results Mean age of respondents was 36.49 years, (95% CI [35.5, 37.5]). Most (64.5%) houses were semi-permanent, with 58.6% having an average kitchen size (5.6 m2). Wood and kerosene were the most preferred fuel types for cooking (96.8%) and lighting (97.4%), respectively. Smoke from the wood was identified as the dominant (96.8%) source of IAP. Most women (92.0%) and children (95.4%) had coughs of varying intensities during the year, while 31.5% of the women reported wheezing. About 98% of them experienced fatigued and headaches. Use of wood fuel was associated with increased coughing (p = 0.03), phlegm (p = 0.02), wheezing (p = 0.04), eye problems (p = 0.03) and headaches (p = 0.01) among women and children in the previous 24 h. Education level, ventilation, main fuel source used in 24 h, indoor cooking and house type were significantly associated with IAP health effects (p ≤ 0.05). Conclusions Supporting the impoverished households and increasing their level of awareness on health-effects of IAP occasioned by use of biomass fuel while cooking indoors may be the first step in implementing a programme aimed at reducing exposure among rural households in Trans Nzoia County, in rural parts of Western Kenya.

Background: Worldwide, around 3 billion people rely on solid fuel for their daily energy needs. Household air pollution secondary to solid fuel burning is a major risk factor for respiratory mobility among vulnerable populations. This study aimed to investigate the respiratory symptoms associated with solid fuel usage, the level of kitchen fuel smoke exposure and its association with respiratory symptoms among reproductive-aged women in Sri Lanka, where most households exclusively use firewood as the primary cooking fuel.Methods: A descriptive cross-sectional study was conducted among 403 reproductive-aged women (15 to 49 years) in the Central Province, Sri Lanka. A structured interviewer-administered questionnaire was used to collect data, and an exposure assessment was done using a breath carbon monoxide monitor.Results: After adjusting for potential confounding factors by the logistic regression models, the odds ratios (OR) of the liquid petroleum gas-only users for at least one respiratory symptom relevant to cough (OR: 0.39; 95% confidence interval [CI]: 0.20-0.78), wheezing (OR: 0.47; 95% [CI]: 0.26-0.87), and dyspnea (OR: 0.44; 95% CI: 0.24-0.84) were significantly lower compared to firewood-only users. The mean of expired air carbon monoxide and estimated carboxyhemoglobin levels of liquid petroleum gas-only users (2.84 ± 2.85 ppm; 1.08 ± 0.46%) were significantly lower than those of firewood-only users (5.27 ± 4.64 ppm; 1.47 ± 0.74%).Conclusions: The use of firewood increased the risk of respiratory symptoms among reproductive-aged women in Sri Lanka. Health education focused on positive behavioral changes and effective and efficient clean energy policies are recommended to mitigate the risk associated with solid fuel smoke exposure. [ABSTRACT FROM AUTHOR]

Introduction: In India, about 90% of the rural population relied upon biomass fuels like animal dung, crop residues and wood. Women generally being involved in cooking are at higher risk of developing respiratory diseases following use of unclean fuels. Objective: The objective of the study is to assess the association of respiratory morbidity with different fuels and the duration of exposure in the women residing in the rural area of Maharashtra. Methodology: A community-based cross-sectional study was conducted in field practice area of the Department of Community Medicine of Government Medical College in Maharashtra. Total of 994 eligible subjects were included in the study and data was collected using predesigned structured questionnaire. Abnormal pulmonary function of the study subjects was assessed by the measurement of peak expiratory flow rate (PEFR). Statistical tests such as ANOVA, bivariate and multivariate analysis were used. Results: Out of 994 subjects, 725 (72.9%) subjects were using only biomass fuel and 120 (12.1%) were using only LPG for domestic purposes. Lowest mean PEFR was seen in mixed fuel users, that is, 284.09 (SD ± 64.83), followed by biomass fuel users, that is, 287.88 (SD ± 61.47). Respiratory morbidity was seen in 369 (38.1%) subjects with maximum morbidity in biomass users, that is, 262 (p < 0.001). Occurrence of respiratory symptoms like dyspnoea, cough and rhinitis was significantly higher amongst the subjects using biomass fuel, with P < 0.001. Bivariate and multivariate analysis showed that use of biomass fuel, age above 60 years and EI more than 90 had higher odds of having respiratory morbidity.Conclusion: The risk of developing respiratory morbidities is high in subjects using biomass fuel. Also, the occurrence of such morbid conditions depends on the higher age and longer duration of exposure to biomass smoke. [ABSTRACT FROM AUTHOR]