Control of fine particulate nitrate during severe winter haze in“2+26”cities  

作　　者：Chuang Qin Xiao Fu Tao Wang Jian Gao Jiaqi Wang 

机构地区：[1]Institute of Environment and Ecology,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [2]Department of Civil and Environmental Engineering,Hong Kong Polytechnic University,Hong Kong 99907,China [3]State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 10084,China

出　　处：《Journal of Environmental Sciences》2024年第2期261-269,共9页环境科学学报（英文版）

基　　金：National Natural Science Foundation of China (No.22206106);the Scientific Research Start-up Funds from Tsinghua Shenzhen International Graduate School (No.QD2021015C);the Natural Science Foundation of Guangdong Province (No.2022A1515010705)。

摘　　要：The“2+26”cities,suffering the most severe winter haze pollution,have been the key region for air quality improvement in China.Increasing prominent nitrate pollution is one of the most challenging environmental issues in this region,necessitating development of an effective control strategy.Herein,we use observations,and state-of-the-art model simulations with scenario analysis and process analysis to quantify the effectiveness of the future SO_(2)-NO_(X)-VOC-NH_(3) emission control on nitrate pollution mitigation in“2+26”cities.Focusing on a serious winter haze episode,we find that limited NO_(X)emission reduction alone in the short-term period is a less effective choice than VOC or NH_3emission reduction alone to decrease nitrate concentrations,due to the accelerated NO_(X)-HNO_(3)conversion by atmospheric oxidants and the enhanced HNO_(3)to NO_(3)^(-)partition by ammonia,although deep NO_(X)emission reduction is essential in the long-term period.The synergistic NH_(3) and VOC emission control is strongly recommended,which can counteract the adverse effects of nonlinear photochemistry and aerosol chemical feedback to decrease nitrate more.Such extra benefits will be reduced if the synergistic NH_(3) and VOC reduction is delayed,and thus reducing emission of multiple precursors is urgently required for the effective control of increasingly severe winter nitrate pollution in“2+26”cities.

关 键 词：NITRATE Winter haze pollution Emission reduction “2+26”cities 

分 类 号：X513[环境科学与工程—环境工程]