Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit
This study analyzed the effectiveness of temporary emission control measures on air quality of Nanjing, China during the Jiangsu Development Summit (JDS). We employed a regional chemistry model WRF-Chem to simulate air pollutants in Nanjing and compared the results to surface observations and satell...
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doaj-f2b09e8a51404f448f719c934f9320032021-07-30T06:27:12ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2021-07-01910.3389/fenvs.2021.693513693513Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development SummitHaoran Zhang0Keqin Tang1Weihang Feng2Xintian Yan3Hong Liao4Nan Li5Nan Li6Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Shanghai, ChinaThis study analyzed the effectiveness of temporary emission control measures on air quality of Nanjing, China during the Jiangsu Development Summit (JDS). We employed a regional chemistry model WRF-Chem to simulate air pollutants in Nanjing and compared the results to surface observations and satellite retrievals. During the JDS, air pollutant emissions from industry and transportation sectors largely decreased by 50–67% due to the short-term emission control measures such as reducing coal combustions, shutting down factories, and partially limiting traffic. Benefiting from the emission control, the simulated concentrations of PM2.5, NO2, SO2, CO and VOCs in Nanjing decreased by 17%, 20%, 20%, 19%, and 15% respectively, consistent with the surface and satellite observations. However, both the observed and simulated O3 increased by 3–48% during the JDS, which was mainly due to the remarkable NOx emission reduction (26%) in the downtown of Nanjing where the O3 production regime was mainly VOC-controlled. In addition, the atmospheric oxidation capacity and further the sulfur oxidation ratio, were facilitated by the elevated O3, which led to variable mitigation efficiencies of different secondary PM2.5 compositions. Our study offers an opportunity for understanding the coordinated control of PM2.5 and O3 in typical city clusters, and can provide implications for future mitigation actions.https://www.frontiersin.org/articles/10.3389/fenvs.2021.693513/fullPM2.5O3emission controlWRF-Chemsatellite remote sensing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haoran Zhang Keqin Tang Weihang Feng Xintian Yan Hong Liao Nan Li Nan Li |
spellingShingle |
Haoran Zhang Keqin Tang Weihang Feng Xintian Yan Hong Liao Nan Li Nan Li Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit Frontiers in Environmental Science PM2.5 O3 emission control WRF-Chem satellite remote sensing |
author_facet |
Haoran Zhang Keqin Tang Weihang Feng Xintian Yan Hong Liao Nan Li Nan Li |
author_sort |
Haoran Zhang |
title |
Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit |
title_short |
Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit |
title_full |
Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit |
title_fullStr |
Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit |
title_full_unstemmed |
Impact of Short-Term Emission Control Measures on Air Quality in Nanjing During the Jiangsu Development Summit |
title_sort |
impact of short-term emission control measures on air quality in nanjing during the jiangsu development summit |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Environmental Science |
issn |
2296-665X |
publishDate |
2021-07-01 |
description |
This study analyzed the effectiveness of temporary emission control measures on air quality of Nanjing, China during the Jiangsu Development Summit (JDS). We employed a regional chemistry model WRF-Chem to simulate air pollutants in Nanjing and compared the results to surface observations and satellite retrievals. During the JDS, air pollutant emissions from industry and transportation sectors largely decreased by 50–67% due to the short-term emission control measures such as reducing coal combustions, shutting down factories, and partially limiting traffic. Benefiting from the emission control, the simulated concentrations of PM2.5, NO2, SO2, CO and VOCs in Nanjing decreased by 17%, 20%, 20%, 19%, and 15% respectively, consistent with the surface and satellite observations. However, both the observed and simulated O3 increased by 3–48% during the JDS, which was mainly due to the remarkable NOx emission reduction (26%) in the downtown of Nanjing where the O3 production regime was mainly VOC-controlled. In addition, the atmospheric oxidation capacity and further the sulfur oxidation ratio, were facilitated by the elevated O3, which led to variable mitigation efficiencies of different secondary PM2.5 compositions. Our study offers an opportunity for understanding the coordinated control of PM2.5 and O3 in typical city clusters, and can provide implications for future mitigation actions. |
topic |
PM2.5 O3 emission control WRF-Chem satellite remote sensing |
url |
https://www.frontiersin.org/articles/10.3389/fenvs.2021.693513/full |
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