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Exploring the Joint Impacts of Natural and Built Environments on PM2.5 Concentrations and Their Spatial Heterogeneity in the Context of High-Density Chinese Cities
- Source :
- Sustainability, Vol 13, Iss 11775, p 11775 (2021)
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- Air pollution in China has attracted wide interest from the public and academic communities. PM2.5 is the primary air pollutant across China. PM2.5 mainly comes from human activities, and the natural environment and urban built environment affect its distribution and diffusion. In contrast to American and European cities, Chinese cities are much denser, and studies on the relationships between urban form and air quality in high-density Chinese cities are still limited. In this paper, we used the ordinary least square (OLS) and geographical weighted regression (GWR) models, selected an already high-density city, Shenzhen, as the study area, and explored the effects of the natural and built environments on air pollution. The results showed that temperature always had a positive influence on PM2.5 and wind speed had a varied impact on PM2.5 within the city. Based on the natural factors analysis, the paper found that an increase in the floor area ratio (FAR) and road density may have caused the increase in the PM2.5 concentration in the central city. In terms of land use mix, land use policies should be adopted separately in the central city and suburban areas. Finally, in terms of spatial heterogeneity, the GWR models achieved much better performances than the global multivariate regression models, with lower AICc and RMSE values and higher adjusted R2 values, ultimately explaining 60% of the variance across different city areas. The results indicated that policies and interventions should be more targeted to improve the air environment and reduce personal exposure according to the spatial geographical context.
- Subjects :
- Geography, Planning and Development
Air pollution
TJ807-830
Context (language use)
Management, Monitoring, Policy and Law
TD194-195
medicine.disease_cause
Renewable energy sources
medicine
GE1-350
PM2.5 concentrations
Air quality index
Built environment
Environmental effects of industries and plants
Land use
Renewable Energy, Sustainability and the Environment
business.industry
Environmental resource management
spatial heterogeneity
Variance (land use)
Floor area ratio
Spatial heterogeneity
Environmental sciences
Geography
business
natural and built environment
Subjects
Details
- ISSN :
- 20711050
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Sustainability
- Accession number :
- edsair.doi.dedup.....38949eb2b19927fbbf7d1f7ebb658079