Wei Wen, N. D. Tharaka W. A., Lei Liu, Xin Ma, Liyao Shen, Zifan Deng
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引用次数: 0
Abstract
The implementation of policies such as the “Clean Air Action Plan” has contributed to the ongoing enhancement of air quality in Beijing. This study investigates the characteristics of visibility, PM2.5 concentration, and its components, as well as their effects on extinction, and oxidative potential (OPv) through observational data and the WRF-Chem model within the context of these emission reduction strategies. Analysis of data collected during the spring and summer of 2019 revealed that PM2.5 concentrations were significantly higher in spring (48 µg/m³) compared to summer (35 µg/m³), primarily due to emissions related to heating and unfavorable meteorological conditions. While average visibility showed slight variation between the seasons (21.53 km in spring versus 20.99 km in summer), OPv was markedly elevated in summer. The chemical composition of PM2.5 was found to exert a more substantial influence on visibility and OPv than mass concentration alone. Visibility appeared to be strongly influenced by relative humidity (RH), mainly when RH ≤ 60%. Conversely, PM2.5 concentrations significantly affected visibility within the range of 40% ≤ RH < 60%. Nitrate contributed the most to the extinction coefficient (37%), followed by organic carbon (24%) and sulfate (15%). The contribution rates of various chemical components to atmospheric extinction were significantly altered depending on visibility levels. Secondary components were identified as the principal source of atmospheric extinction, comprising 41% of total extinction, and were also the predominant contributors to OPv. The findings of this study lay the groundwork for the development of more effective air quality management strategies in Beijing.
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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