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Comparison of Different Impact Factors and Spatial Scales in PM 2.5 Variation.
- Source :
- Atmosphere; Mar2024, Vol. 15 Issue 3, p307, 20p
- Publication Year :
- 2024
-
Abstract
- PM<subscript>2.5</subscript> particles with an aerodynamic diameter of less than 2.5 μm are receiving increasing attention in China. Understanding how complex factors affect PM<subscript>2.5</subscript> particles is crucial for the prevention of air pollution. This study investigated the influence of meteorological factors and land use on the dynamics of PM<subscript>2.5</subscript> concentrations in four urban agglomerations of China at different scales from 2010 to 2020, using the Durbin spatial domain model (SDM) at five different grid scales. The results showed that the average annual PM<subscript>2.5</subscript> concentration in four core urban agglomerations in China generally had a downward trend, and the meteorological factors and land use types were closely related to the PM<subscript>2.5</subscript> concentration. The impact of temperature on PM<subscript>2.5</subscript> changed significantly with an increase in grid scale, while other factors did not lead to obvious changes. The direct and spillover effects of different factors on PM<subscript>2.5</subscript> in inland and coastal urban agglomerations were not entirely consistent. The influence of wind speed on coastal urban clusters (the Pearl River urban agglomeration (PRD) and Yangtze River urban agglomeration (YRD)) was not significant among the meteorological factors, but it had a significant impact on inland urban clusters (the Beijing–Tianjin–Hebei urban agglomeration (BTH) and Chengdu–Chongqing urban agglomeration (CC)). The direct effect of land use type factors showed an obvious U-shaped change with an increase in the research scale in the YRD, and the direct effect of land use type factors was almost twice as large as the spillover effect. Among land use type factors, human factors (impermeable surfaces) were found to have a greater impact in inland urban agglomerations, while natural factors (forests) had a greater impact in coastal urban agglomerations. Therefore, targeted policies to alleviate PM<subscript>2.5</subscript> should be formulated in inland and coastal urban agglomerations, combined with local climate measures such as artificial precipitation, and urban land planning should be carried out under the consideration of known impacts. [ABSTRACT FROM AUTHOR]
- Subjects :
- POLLUTION prevention
LAND use planning
LAND use
WIND speed
URBAN planning
Subjects
Details
- Language :
- English
- ISSN :
- 20734433
- Volume :
- 15
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Atmosphere
- Publication Type :
- Academic Journal
- Accession number :
- 176270302
- Full Text :
- https://doi.org/10.3390/atmos15030307