Impacts of emission reduction and meteorological conditions on air quality improvement from 2016 to 2020 in the Northeast Plain,China  

作　　者：Xueling Yang Qiyuan Wang Lang Liu Jie Tian Hailing Xie Luyao Wang Yue Cao Steven Sai Hang Ho 

机构地区：[1]Key Laboratory of Aerosol Chemistry and Physics,State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [2]Xi’an Institute for Innovative Earth Environment Research,Xi’an 710061,China [3]National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain,Xi’an 710061,China [4]College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073,China [5]Division of Atmospheric Sciences,Desert Research Institute,Reno,NV 89512,USA

出　　处：《Journal of Environmental Sciences》2025年第5期484-496,共13页环境科学学报(英文版)

基　　金：supported by the National Key R&D Program of China(No.2022YFF0802501);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2022416);the Natural Science Basic Research Program of Shaanxi(No.2022JQ-267);the State Key Laboratory of Loess and Quaternary Geology(No.SKLLQG2335).

摘　　要：The Northeast Plain in China ranks among the top five regions that have been significantly impacted by haze pollution.To effectively control pollution,it is crucial to accurately assess the effects of emission reduction measures.In this study,we analyzed surveillance data and found substantial decreases(ranging from 19.0%to 50.1%)in average annual mass concentrations of key pollutants(such as CO,SO_(2),NO_(2),and PM_(2.5))in the Northeast Plain from 2016 to 2020.To precisely determine the contributions of meteorological conditions and emission reductions to the improvement of air quality in the Northeast Plain,we conducted three scenario simulations.By comparing source emissions in December 2016 and 2020 using the WRF-Chem model(except for SO_(2)),we observed significant reductions of 21.3%,8.8%,and 9.8%in mass concentrations of PM_(2.5),NO_(2),and CO,respectively,from 2016 to 2020.This highlights the essential role that meteorological conditions play in determining air quality in the Northeast Plain.Moreover,further reducing source emissions by 30%in December 2016 resulted in subsequent reductions of 25.3%,29.0%,4.5%,and 30.3%in mass concentrations of PM_(2.5),SO_(2),NO_(2),and CO,respectively,under the same meteorological conditions.Notably,source emission reduction was effective for PM_(2.5),SO_(2),and CO,but not for NO_(2).The improvement in air quality in the Northeast Plain from 2016 to 2020 can be attributed to the combined effects of improved meteorological conditions and reduced pollution sources.

关 键 词：Air quality Emission reduction Meteorological conditions The Northeast Plain WRF-Chem 

分 类 号：X51[环境科学与工程—环境工程]