Environmental Research Institute, Ajou University, Suwon, Republic of Korea.
Department of Environmental and Safety Engineering, Ajou University, Suwon, Republic of Korea.
Sci Rep. 2020 Dec 17;10(1):22112. doi: 10.1038/s41598-020-79088-2.
In January 2020, anthropogenic emissions in Northeast Asia reduced due to the COVID-19 outbreak. When outdoor activities of the public were limited, PM concentrations in China and South Korea between February and March 2020 reduced by - 16.8 μg/m and - 9.9 μg/m respectively, compared with the average over the previous three years. This study uses air quality modeling and observations over the past four years to separate the influence of reductions in anthropogenic emissions from meteorological changes and emission control policies on this PM concentration change. Here, we show that the impacts of anthropogenic pollution reduction on PM were found to be approximately - 16% in China and - 21% in South Korea, while those of meteorology and emission policies were - 7% and - 8% in China, and - 5% and - 4% in South Korea, respectively. These results show that the influence on PM concentration differs across time and region and according to meteorological conditions and emission control policies. Finally, the influence of reductions in anthropogenic emissions was greater than that of meteorological conditions and emission policies during COVID-19 period.
2020 年 1 月，由于 COVID-19 爆发，东北亚地区的人为排放减少。当公众的户外活动受到限制时，2020 年 2 月至 3 月中国和韩国的 PM 浓度分别比过去三年的平均值减少了-16.8μg/m 和-9.9μg/m。本研究利用过去四年的空气质量模型和观测数据，将人为排放减少对 PM 浓度变化的影响与气象变化和排放控制政策的影响区分开来。结果表明，人为污染减排对 PM 的影响在中国约为-16%，在韩国约为-21%，而气象和排放政策的影响在中国分别为-7%和-8%，在韩国分别为-5%和-4%。这些结果表明，PM 浓度的影响因时间、区域、气象条件和排放控制政策而异。最后，在 COVID-19 期间，人为排放减少的影响大于气象条件和排放政策的影响。
