科研之友
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摘要
Since the publicly releasing of the Guangzhou Air Quality Compliance Plan（GAQCP）in 2017，the air quality in Guangzhou had been significantly improved，with all the air quality indices attaining standards for the first time in 2020. Qualifying the impact of the local emission control measures in GAQCP would provide critical references for subsequent air pollution control policy-making. In this study，the emission reductions caused by three anthropogenic factors，including reductions contributed by the local emission control measures，the COVID-19 shutdown，and the emission control in neighboring cities，were first estimated. The associated estimates were then applied to quantify the contributions of these three anthropogenic factors and the meteorological variation to the air quality improvement in Guangzhou from 2017 to 2020 by using the WRF-CMAQ and the SMAT-CE. The results showed that the implementation of local emission control measures was the dominant factor in SO2，NO2，PM10，and PM2.5 concentration decreases during 2017—2020，with contributions of 53.58%，31.60%，34.24%，and 30.82%，respectively. The contributions of the COVID-19 shutdown to the pollutant concentration decreases were significant in the early period but then declined as the industrial and manufacturing activities recovered. The emission reduction in neighboring cities was less beneficial to air quality improvement compared with the local emission control measures. The changes in meteorological conditions had positive effects on all the pollutant concentration decreases，with significant contributions to the O3 concentration reductions（81.96%）. ? 2023 Science Press.
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