TY - JOUR
T1 - Evidence for Reducing Volatile Organic Compounds to Improve Air Quality from Concurrent Observations and in Situ Simulations at 10 Stations in Eastern China
AU - Lyu, Xiaopu
AU - Guo, Hai
AU - Zou, Qiaoli
AU - Li, Ke
AU - Xiong, Enyu
AU - Zhou, Beining
AU - Guo, Peiwen
AU - Jiang, Fei
AU - Tian, Xudong
N1 - Funding Information:
The work described in this paper was supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (PolyU 15219621 and PolyU 15212421) and the Start-up Fund for RAPs under the Strategic Hiring Scheme of the Hong Kong Polytechnic University (1-BD87). Z.Q. and T.X. thank the support of Zhejiang Society for Environmental Sciences (2020HT0048). We thank Dr. Glenn Wolfe at NASA, U.S.A. for providing the original code for F0AM.
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/11/15
Y1 - 2022/11/15
N2 - Ground-level ozone (O3) has been an emerging air pollution in China and interacts with fine particulate matters (PM2.5). We synthesized observations of O3and its precursors in two summer months of 2020 at 10 sites in the Zhejiang province, East China and simulated the in situ photochemistry. O3pollution in the northeastern Zhejiang province was more serious than that in the southwest. The site-average daytime O3increment correlated well (R2= 0.73) with the total reactivity of volatile organic compounds (VOCs) and carbon monoxide toward the hydroxyl radical (OH) in urban areas. Model simulation revealed that the main function of nitrogen oxides (NOx) at the rural sites where isoprene accounted for >85% of OH reactivity of VOCs was to facilitate the radical cycling. With NOxreduction from 0 to 90%, the self-reactions between peroxy radicals (Self-Rxns), a proven pathway for secondary organic aerosol formation, were intensified by up to 23-fold in a NOx-rich environment. In contrast, reducing VOCs could weaken the Self-Rxns while reducing O3production rate and atmospheric oxidation capacity. This study observes and simulates O3chemistry based on extensive measurements in typical Chinese cities, highlighting the necessity of reducing VOCs for co-benefit of O3and PM2.5
AB - Ground-level ozone (O3) has been an emerging air pollution in China and interacts with fine particulate matters (PM2.5). We synthesized observations of O3and its precursors in two summer months of 2020 at 10 sites in the Zhejiang province, East China and simulated the in situ photochemistry. O3pollution in the northeastern Zhejiang province was more serious than that in the southwest. The site-average daytime O3increment correlated well (R2= 0.73) with the total reactivity of volatile organic compounds (VOCs) and carbon monoxide toward the hydroxyl radical (OH) in urban areas. Model simulation revealed that the main function of nitrogen oxides (NOx) at the rural sites where isoprene accounted for >85% of OH reactivity of VOCs was to facilitate the radical cycling. With NOxreduction from 0 to 90%, the self-reactions between peroxy radicals (Self-Rxns), a proven pathway for secondary organic aerosol formation, were intensified by up to 23-fold in a NOx-rich environment. In contrast, reducing VOCs could weaken the Self-Rxns while reducing O3production rate and atmospheric oxidation capacity. This study observes and simulates O3chemistry based on extensive measurements in typical Chinese cities, highlighting the necessity of reducing VOCs for co-benefit of O3and PM2.5
KW - atmospheric oxidation capacity
KW - coordinated air pollution control
KW - ground-level ozone
KW - in situ photochemistry
KW - volatile organic compounds
UR - http://www.scopus.com/inward/record.url?scp=85141471756&partnerID=8YFLogxK
U2 - 10.1021/acs.est.2c04340
DO - 10.1021/acs.est.2c04340
M3 - Journal article
C2 - 36314604
AN - SCOPUS:85141471756
SN - 0013-936X
VL - 56
SP - 15356
EP - 15364
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 22
ER -