Impact of land-cover layout on particulate matter 2.5 in urban areas of China
2020
Li, Jiayi | Huang, Xin
Urbanization in China is closely connected with ambient particulate matter 2.5 (PM₂.₅). However, the potential for altering PM₂.₅ through the urban landscape characteristics is uncertain. In this study, we analyzed the urban PM₂.₅ pollution situation for 2014–2016 and investigated the impact of landscape factors on urban PM₂.₅ in China at the city level. All the prefecture-level cities were stratified by urban population size into small (<500,000), medium (500,000–1,000,000), and large (>1,000,000), and the other second-level administrative cities were assigned as ‘other’ cities. The multivariate regression model including both urban landscape factors and social-economic variables explained 70.0%, 32.8%, 19.2%, and 12.4% of the arithmetic mean PM₂.₅ concentration (AMC-PM₂.₅) for the other, small, medium, and large cities, respectively. With regard to the configuration of land cover, agricultural activity is a major contributor of PM₂.₅ pollution, for which the explanatory power ranged from 7.6% (for the large cities) to 64% (for the other cities). In addition, grassland aggregation also has a limited but negative effect on urban PM₂.₅ pollution, despite the negligible effect on dry deposition. Overall, these findings likely reflect the interaction between urban air quality and urbanization, and will have implications for air quality control strategies.
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