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Objective To analyze the basic hygiene status and main health hazard factors of public places in Hainan Province, so as to provide technical support for promoting health management of public places. Methods The health hazard factors of 200 public places in Hainan Province were monitored in 2022, and the results were statistically analyzed. Results A total of 2 339 samples from public places in Hainan Province were monitored, and the overall qualified rate was 83.9%. There were significant differences in the qualified rates of samples from different types of places (χ#178;=120.63, P < 0.05). Among them, the qualified rates of swimming pools (halls) and hotels (hotels) were relatively low, which were 65.8% and 76.3%, respectively, while the overall qualified rates of the other five types of places were between 85.7% and 96.5%. The main unqualified indexes of indoor air in hotels were formaldehyde, the total number of bacteria, PM10, and PM25. The main unqualified indexes of indoor air in barber shops and beauty shops were ammonia and PM10. The main unqualified index of indoor air in shopping malls (supermarkets) was the total number of bacteria. The total number of bacteria detected in all kinds of public goods and appliances in 6 types of public places exceeded the limit. The unqualified rate of pH value of towels in hotels, beauty shops, and barber shops was 43.2%, 13.6% and 11.4%, respectively. The main unqualified indexes of swimming pool were the pH value of swimming pool water, urea and oxidation-reduction potential, and the unqualified rate of oxidation-reduction potential was 29.6%. Conclusion The hygienic condition of public places in Hainan Province still needs to be improved in 2022. It is suggested that the relevant departments further strengthen the supervision and monitoring of the total number of bacteria, ammonia, PM10, PM25 and formaldehyde in indoor air, the total number of bacteria, coliform group and pH value of towels for public goods, and the redox potential, urea and pH value of swimming pool water. [ABSTRACT FROM AUTHOR]

The indoor thermal environment for the impinging jet ventilation combined with radiant ceiling(IJV/RC) air-conditioning system with different operating load conditions was simulated. The GA-BP neural network was applied to develop the predictive models between the operating performance(draught discomfort RPD, temperature difference between the head and ankle level Δt, air change efficiency eACE, and average temperature of operation ta) and design variables (supply temperature ts, supply velocity vs, chilled ceiling temperature tc, and room load Qc). The significance of each design variable on the studied operating performance was determined and ranked through correlation analysis. The results show that Δt decreases with the increase of vs, but the value of RPD increases accordingly. The increase of tc is helpful for the decrease of Δt and RPD, but the value of ta increases. The decrease of ta can be achieved by reducing ts, but the indoor air quality becomes worse. To achieve the goals of providing good indoor air quality and indoor thermal comfort, a multi-objective optimization for the IJV/RC was conducted by applying the improved particle swarm optimization(PSO) algorithm, and the optimal combinations of the studied design variables corresponding to the room loads were developed. The current results can provide theoretical guidance for the design and operation control for the IJV/RC system. [ABSTRACT FROM AUTHOR]

The aromatic odor of Plectranthus hadiensis var. tomentosus has been found to have the potential to improve physical and mental health of people in indoor environment, but its effectivess is reduced for that the release of volatile organic compounds from plants is susceptible to indoor environmental changes. The purpose of this study was to investigate the response of volatile organic compounds released by P. hadiensis var. tomentosus to common indoor environmental changes, and to provide a scientific basis for its efficient and sustainable application in building a comfortable pro-biotic environment to improve the physical and mental health of indoor personnel. Thus, the effects of four typical indoor environmental factors, such as air temperature, air relative humidity, CO2 concentration and light variation, on the release of volatile organic compounds from P. hadiensis var. tomentosus were investigated in this study. And the dynamic headspace and gas chromatography-mass spectrometry techniques were used to analyze the volatile organic compounds in different indoor environments with an environmental control device based on mixed-level orthogonal array design. The results were as follows:(1)Among the four typical indoor environmental factors of air temperature, air relative humidity, CO2 concentration and light condition, CO2 concentration and air temperature had greater effects on the release of volatile organic compounds from P. hadiensis var. tomentosus, while the effects of air relative humidity and light were weak.(2)For P. hadiensis var. tomentosus cultivated under normal photoperiod, an environmental condition with CO2 concentration of 500 μmol·mol-1, air temperature of 25 ℃ and air relative humidity of 60% was the most suitable for releasing volatile organic compounds from P. hadiensis var. tomentosus in the absence of light. Under this environmental condition, the total amount of volatile organic compounds released by P. hadiensis var. tomentosus was 86.23 μg·L-1·kg-1, and the content of biological active components with potentials for the positive intervention of physical and mental health was 78.03 μg·L-1·kg-1. In summary, the results suggest that when the aroma plant P. hadiensis var. tomentosus is used to build an indoor pro-biotic environment to maintain or improve the physical and mental health of people in indoor, the environmental conditions should be controlled properly, especially CO2 concentration and air temperature, so as to fully and efficiently produce the positive health benefits from P. hadiensis var. tomentosus. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Benzene toluene ethylbenzene & xylene (BTEX) in indoor air has significant harm for human health. This paper designs an experiment platform for alternating adsorption-enhanced catalytic treatment of BTEX by plasma. The experiment platform consists of adsorption/catalysis dual-function module, low-temperature plasma generation module, pipeline system and control system. The development of the experiment platform achieves the green goal of continuous control of low concentration BTEX for a long time without O3 secondary pollution. The teaching application of the platform enriches the form and content of experimental courses such as air pollution control engineering and environmental comprehensive experiment, and helps to cultivate students' innovative thinking and comprehensive ability to solve practical engineering problems. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The emission characteristics of VOCs (volatile organic compounds) from laminate flooring were investigated and their impacts on indoor environment evaluated in order to provide basic data for the study of harmful gas release from laminate flooring, and to provide reference for producers and consumers to evaluate their effects on indoor air quality. In this study, Shuang Xiang laminate flooring was selected and sampled with 1 m 3 climate chamber method. The sampled VOCs were analyzed by GC-MS (gas chromatography-mass spectrometry) and according to the forestry industry standards LY/ T 3230-2020 “Classification of volatile organic compound emissions contents from wood-made panels and their finishing products” and LY/ T 3229 - 2020 “ Specification for indoor carrying capacity of wood-based panels and finishing products based on volatile organic compounds emission”, the laminate flooring on indoor air quality was evaluated. Results showed that the TVOC release of this laminate flooring gradually decreased with time and reached the release equilibrium at day 28. The VOCs released were mainly olefins, aromatic hydrocarbons and alkanes, with small amounts of aldehydes, ketones, lipids and alcohols. In one cycle, the release level of naphthalene on the 3rd day of the laminate flooring did not meet the Class I standard, and the release levels of several major pollutants were Class I at the rest of the time. VOCs composite index of laminate flooring decreased with the increase of time after the 3rd day, and according to the composite index grading standard, the VOCs release class of laminate flooring on the 3rd day was Class Ⅱ, and the indoor air quality was qualified, and the VOCs release class of the rest of the time was Class I, and the indoor air quality was excellent. The TVOC release rate of this laminate flooring gradually decreased with time, in line with the mass transfer principle. After the VOCs were released in equilibrium, the release class is in line with Class I. The calculated composite index was in line with Class I. The indoor air quality was excellent and consumers can use it with confidence [ABSTRACT FROM AUTHOR]

In order to solve the problem of poor indoor air quality in teaching buildings of natural ventilation colleges and universities in cold areas, the temperature and humidity, CO2 concentration, wind speed and other parameters of 13 natural ventilation classrooms in a university in Xi’an were monitored. At the same time, 698 students′ subjective evaluation of indoor temperature, humidity and air quality were recorded. The results show that the average clothing thermal resistance in winter is 1.29 clo, and the indoor thermal neutral temperature is 20.7 ℃. Except for the humidity, the temperature and CO2 concentration in the tested classroom do not meet the requirements of national indoor air quality standards. Combined with the students′ evaluation of indoor air quality, it is concluded that the unreasonable use of doors and windows for ventilation has led to poor indoor air circulation, the overall environment comfort degree and satisfaction level the students percieved during class is low, such as by drowsiness, dry skin, decreased concentration, and emotional depression.

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problem of poor indoor air quality in teaching buildings of natural ventilation colleges and universities in cold areas, the temperature and humidity, CO2 concentration, wind speed and other parameters of 13 natural ventilation classrooms in a university in Xi’an were monitored. At the same time, 698 students′ subjective evaluation of indoor temperature, humidity and air quality were recorded. The results show that the average clothing thermal resistance in winter is 1.29 clo, and the indoor thermal neutral temperature is 20.7℃. Except for the humidity, the temperature and CO2 concentration in the tested classroom do not meet the requirements of national indoor air quality standards. Combined with the students′ evaluation of indoor air quality, it is concluded that the unreasonable use of doors and windows for ventilation has led to poor indoor air circulation, the overall environment comfort degree and satisfaction level the students percieved during class is low, such as by drowsiness, dry skin, decreased concentration, and emotional depression. [ABSTRACT FROM AUTHOR]

Copyright of South Architecture / Nanfang Jianzhu is the property of South Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To study the influence of diluent types on the properties of paint film and the benzene series releasing from PU-painted particleboard, two kinds of solvents(Ethyl acetate, industrial mixed solvent) were chosen as PU lacquer thinners. Taking PU-lacquered particleboard as the research object, a small environmental cabin was used to simulate the indoor environment, and the benzene series releasing from lacquered board were detected by GC-MS. According to the pollution index evaluation model, the indoor air quality under two coating conditions was evaluated, and the performance of paint film was tested to explore the influence of diluent type on paint film properties. The results showed that: under the condition of using particleboard furniture alone, 14 benzene series were detected from PU-M with a total concentration of 257.55μg/m3, and the pollution index of VOCs and benzene series exceeded the standard. 10 benzene series were detected from PU-E with a total concentration of 130.4μg/m3,the total pollution index exceeded the standard, and the adhesion of paint film and alkali resistance were better than PU-M. Therefore, choosing Ethyl acetate as diluent can effectively reduce the type and concentration of benzene series releasing from the plate, with lower pollution index and better paint film performance, which can provide guidance for industrial production of environment-friendly PU paint. [ABSTRACT FROM AUTHOR]

Housing environment has become a driving factor on hen health, egg quality and efficient production in intensive poultry industry. In large layer poultry housing system, an environmental index is typically used to control air conditions, including air temperature (T), relative humidity (RH) and concentration of carbon dioxide (CO2) in different season. In hot seasons, thermal environment of laying hen housing is usually assessed using the temperature humidity index (THI) via the online monitored temperature and relative humidity. However, the simple assessment cannot meet the harsh requirement of indoor air quality in a large layer house, as the stocking density increases in recent years. In this paper, a comprehensive environmental index (CEI) was proposed based on the radar map to integrate the impacts of both thermal and air quality factors, in order to systematically assess the environment comfort of the birds. A LabVIEW software system was selected to illustrate the environmental comfort using the fuzzy mathematics. Five key environmental factors, including temperature, RH, air velocity, concentration of CO2 and ammonia (NH3), were used to evaluate the environmental comfort of laying hen housing, where the their weights were normalized in a radar map. In the visualized system, early warning can be delivered when either a single factor or the CEI was over the prescribed value, and thereby a quick action can be taken to adjust the environmental conditions in the layer housing to a comfort level. A field measurement was carried out at a commercial layer breeder farm in Hebei province from January to February, and from July to August, 2019. The experimental results indicated that a good performance of the CEI can be obtained to assess the comprehensive environment in the tested house via monitoring the five environmental indexes. The specific sensors were properly settled in the henhouse. The data of environmental conditions was collected to verify, and then the maximum of five indexes were selected for later use. During the summer daytime, the CEI agreed well with the THI, indicating the positive impacts of thermal environment on the comfort of the birds, while it performed better to integrate the thermal and air quality at night time. In winter, the increase in the weight of CO2 concentration can contribute to the CEI for the comfort in layer housing system. The in situ monitoring data in the actual use demonstrated that the CEI can efficiently represent the change of comprehensive environmental comfort in the chicken house, and respond to the interaction between environmental factors in each period, especially when the air quality has an increasing influence on the comprehensive environmental comfort at night in summer and in winter. The findings can provide a promising method to systematically evaluate the housing environment via the five key factors in laying hen housing, further to improve the birds comfort via precisely controlling the air conditions in intensive poultry production. [ABSTRACT FROM AUTHOR]

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At present, most of the swine farms adopt reduce ventilation in winter to keep warm. In order to evalute the indoor air quality under this feeding model, this paper took weaned piglet house with natural ventilation as research object, and adopted CFD technology to run numerical simutation on air velocity, temperature, CO2 concentration in natural ventilated piglet house and on the basis of environment factor spot measurement. The simulation results showed that within piglets activity area, where the breathing level height was 0.4 m and wind speed was under 0.1 m/ s. There was a large airflow stagnation area in the second half of the house, mainly due to the insufficient air ventilation, the fresh air was unable to penetrate the entire pig house. The temperature distribution range was 15~21°C the average temperature round air inlet end was around 16°C the average temperature inside the house was 20°C average CO2 concentration was 0.16%~0.25%, with an average concentration of 0.19%. At 6 environmental measurement points, the relative error of airflow field ranged from 0.2% ~ 30%. The temperature field error was 2% ~ 13%. The relative error range of CO2 concentration was 4.3%~24.2%. The relative error range between measured value and simulation value was within the acceptable limits. The temperature and CO2 concentration in the shed were not within the environmental hygiene standards. The natural ventilation model could not meet the demands of weaned piglets for winter environment. The above results laid a foundation for effectively improving the feeding and management level, and realizing the maximization of economic benefits. [ABSTRACT FROM AUTHOR]

Copyright of New Architecture is the property of New Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The methods of experimental measurements and theoretical calculation are used to research the relationship of indoor CO2 concentration and building air tightness in natural ventilation and mechanical ventilation, respectively. Three experimental conditions of windows closed and opened are designed. The blower door test method is used to test natural ventilation, and the indoor CO2 concentration is tested. The general ventilation theoretical calculation formula is used to calculate the indoor CO2 concentration of mechanical ventilation conditions. The results show that the indoor CO2 concentration difference of windows opened and closed is about 20% in natural ventilation, and it is 10% in mechanical ventilation. [ABSTRACT FROM AUTHOR]

Moxibustion is an effective therapy for treatment of a lot of clinical problems, but the ignited moxa-induced smoke containing harmful substances may bring about indoor air pollution to affect both patients' and medical workers' health. However, there is no standards about controlling indoor air quality (IAQ) for moxibustion rooms in China. In the present study, the authors reviewed newly-published articles about some substances released from moxa smoke as inhalable particles (PM 10 and PM 2.5), formaldehyde, benzene, methylbenzene, xylene, bene[α]pyrene, total volatile organic compounds, CO, CO 2 , NO, SO 2 , NH 3 , O 3 , etc. some of which affect IAQ. On this account, the authors put forward some strategies for controlling IAQ in moxibustion clinics including setting united safe standards, enhancing ventilation, controlling moxibustion material quality and strengthening scientific research on the safety of moxa smoke control, fully playing the superiority of moxibustion therapy and reducing its unfavorable aspects in clinical practice in the future.

Background: Ambient air at the psychiatric nursing station in our hospital had been notably poor for an extensive period of time. CO2 levels at the station averaged 1211 ppm during August, 2009 and a specialist team estimated a CO2 abnormality ratio of 32%. Analysis identified key issues in three problem areas, including (1) ENVIRONMENT: air at the station was not refreshed and electronic equipment was in constant operation; (2) Staff: the station had a high staff-to-space ratio and staffs lacked practical knowledge on indoor air quality maintenance; and (3) Policy: the hospital had no guidelines addressing indoor air quality maintenance., Purpose: The purpose of this project was to reduce ambient CO2 levels at the hospital's acute psychiatric ward in order to create a high-quality working environment for all staff. The short-term goal was to reduce the CO2 abnormality ratio from 32% to 10%. Long-term goals were to maintain an ambient CO2 level in the ward below 1000ppm and further reduce the abnormality ratio to 0%., Methods: To address environment-related issues, we increased the number of indoor plants and turned certain computers off at night. To address staff-related issues, we rearranged staff activity space and educated staff on how to maintain indoor air quality. To address the policy-related issue, we drafted proposed hospital guidelines on indoor air quality maintenance., Results: Post-intervention measurements made in October, 2011 found significantly improved ambient air quality, with CO2 levels at 997ppm and a CO2 abnormality ratio of 0%., Conclusions: Results demonstrate that improvement measures implemented can effectively improve the quality of ambient air at psychiatric nursing stations. A post-intervention survey further found that staffs were both more satisfied with ward air quality and perceived a friendlier ward work environment.