Xiaoju Li, Luqman Chuah Abdullah, Shafreeza Sobri, Mohamad Syazarudin Md Said, Siti Aslina Hussain, Tan Poh Aun, Jinzhao Hu
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Finally, suggestions and measures for synergistic control of O<sub>3</sub> and PM<sub>2.5</sub> are put forward. The results showed that the CWT simulation results were basically consistent with the PSCF simulations, and there were significant inter-annual differences in the potential contributing source areas of pollutants. PM<sub>2.5</sub> and O<sub>3</sub> concentrations are not only affected by local source emissions, but regional transport (Chongqing, Lanzhou, Xi’an) is also an important source of contribution. In addition, the proportion of PM<sub>2.5</sub> pollution trajectories decreased from 30% in 2015 to 12% in 2020, while the proportion of O<sub>3</sub> pollution trajectories fluctuated. This study provides more detailed information on potential source regions of pollutants in typical megacities, better captures their spatial heterogeneity, and highlights the role of local sources and transboundary transport. 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Characteristics of air pollution variation and potential source contributions of typical megacities in the Sichuan Basin, Southwest China
Air pollution is a regional issue, influenced not only by local emission sources but also by regional transport. This study excavated the pollution variation of PM2.5 and O3 from 2014 to 2020 through statistical analysis in the megacity-Chengdu. Then, based on backward trajectory calculation and trajectory clustering, the long-term air mass transport pathways were explored, and the Potential Source Contribution Function (PSCF) model and Concentration Weighted Trajectory (CWT) analysis method were combined to further quantitatively identify the potential source areas affecting PM2.5 and O3 from an annual perspective. Finally, suggestions and measures for synergistic control of O3 and PM2.5 are put forward. The results showed that the CWT simulation results were basically consistent with the PSCF simulations, and there were significant inter-annual differences in the potential contributing source areas of pollutants. PM2.5 and O3 concentrations are not only affected by local source emissions, but regional transport (Chongqing, Lanzhou, Xi’an) is also an important source of contribution. In addition, the proportion of PM2.5 pollution trajectories decreased from 30% in 2015 to 12% in 2020, while the proportion of O3 pollution trajectories fluctuated. This study provides more detailed information on potential source regions of pollutants in typical megacities, better captures their spatial heterogeneity, and highlights the role of local sources and transboundary transport. More importantly, it also accumulated some experience for regional joint prevention and control air pollution in China’s megacities and other similar situations in the world.
期刊介绍：
Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health.
It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes.
International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals.
Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements.
This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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