TY - JOUR
T1 - Exploration of O3-precursor relationship and observation-oriented O3 control strategies in a non-provincial capital city, southwestern China
AU - Xie, Yutong
AU - Cheng, Chunlei
AU - Wang, Zaihua
AU - Wang, Ke
AU - Wang, Yu
AU - Zhang, Xichang
AU - Li, Xingheng
AU - Ren, Lijun
AU - Liu, Ming
AU - Li, Mei
N1 - Funding Information:
The article is supported by the Key-Area Research and Development Program of Guangdong Province (Grant No. 2019B110206001 and 2020B1111360001 ), the National Natural Science Foundation of China (Grant No. 41827804 and 42005080 ), Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province (Grant No. 2019B121205004 ) and the China Postdoctoral Science Foundation (Grant No. 2020M673059 ). We thank Prof. Hai Guo of the Hong Kong Polytechnic University for the assistance of the simulation by the PBM-MCM model.
Funding Information:
The article is supported by the Key-Area Research and Development Program of Guangdong Province (Grant No. 2019B110206001 and 2020B1111360001), the National Natural Science Foundation of China (Grant No. 41827804 and 42005080), Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province (Grant No. 2019B121205004) and the China Postdoctoral Science Foundation (Grant No. 2020M673059). We thank Prof. Hai Guo of the Hong Kong Polytechnic University for the assistance of the simulation by the PBM-MCM model.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12/15
Y1 - 2021/12/15
N2 - To investigate photochemical ozone (O3) formation and provide localized control strategies, an intensive sampling of O3 and its precursors (i.e. volatile organic compounds (VOCs) and nitrogen oxides (NOx = NO + NO2)) were conducted at an urban site in Leshan, Sichuan province during 4–13 August 2019. The mixing ratios of O3, total VOCs (TVOCs) and NOx were 40.0 ± 5.3, 22.5 ± 2.6 and 14.6 ± 3.8 ppbv, respectively (±95% confidence intervals). O3 and its precursors existed a well negative correlation, indicating intensive local O3 formation. To further explore the O3-precursors relationship and observation-oriented O3 control strategies, a photochemical box model coupled with master chemical mechanism (PBM-MCM) was adapted. The relative incremental reactivity (RIR) calculated by model results showed that Leshan was in the VOCs-limited and O3 production was most sensitive to alkenes. Moreover, O3 isopleth diagram was drawn using the PBM-MCM simulation results and seven reduction scenarios were evaluated in Leshan. The reduction ratio of VOCs/NOx on 3:1 was proposed to be the best solution, which can be achieved effective reduction on local O3 formation. At last, since VOCs were the key precursors of O3 in Leshan, VOC sources and their potential contributions to O3 formation were investigated by using the positive matrix factorization (PMF) model. Seven sources were identified, and traffic related emissions (including vehicle exhaust and gasoline evaporation, 29.9%) and fixed combustion (27.7%) had the large contribution to ambient VOCs. Among anthropogenic sources, fixed combustion and solvent usage in painting were the large contributors to O3 formation, accounting for 30.9% and 18.3%, respectively, which should have high priorities on source reduction. This study provides scientific advices for future O3 pollution control strategies in Leshan, which can be extended to other cities.
AB - To investigate photochemical ozone (O3) formation and provide localized control strategies, an intensive sampling of O3 and its precursors (i.e. volatile organic compounds (VOCs) and nitrogen oxides (NOx = NO + NO2)) were conducted at an urban site in Leshan, Sichuan province during 4–13 August 2019. The mixing ratios of O3, total VOCs (TVOCs) and NOx were 40.0 ± 5.3, 22.5 ± 2.6 and 14.6 ± 3.8 ppbv, respectively (±95% confidence intervals). O3 and its precursors existed a well negative correlation, indicating intensive local O3 formation. To further explore the O3-precursors relationship and observation-oriented O3 control strategies, a photochemical box model coupled with master chemical mechanism (PBM-MCM) was adapted. The relative incremental reactivity (RIR) calculated by model results showed that Leshan was in the VOCs-limited and O3 production was most sensitive to alkenes. Moreover, O3 isopleth diagram was drawn using the PBM-MCM simulation results and seven reduction scenarios were evaluated in Leshan. The reduction ratio of VOCs/NOx on 3:1 was proposed to be the best solution, which can be achieved effective reduction on local O3 formation. At last, since VOCs were the key precursors of O3 in Leshan, VOC sources and their potential contributions to O3 formation were investigated by using the positive matrix factorization (PMF) model. Seven sources were identified, and traffic related emissions (including vehicle exhaust and gasoline evaporation, 29.9%) and fixed combustion (27.7%) had the large contribution to ambient VOCs. Among anthropogenic sources, fixed combustion and solvent usage in painting were the large contributors to O3 formation, accounting for 30.9% and 18.3%, respectively, which should have high priorities on source reduction. This study provides scientific advices for future O3 pollution control strategies in Leshan, which can be extended to other cities.
KW - O control strategies
KW - O isopleth diagram
KW - O-precursor relationships
KW - PBM-MCM
KW - VOC sources
UR - http://www.scopus.com/inward/record.url?scp=85112586347&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.149422
DO - 10.1016/j.scitotenv.2021.149422
M3 - Journal article
C2 - 34426320
AN - SCOPUS:85112586347
SN - 0048-9697
VL - 800
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 149422
ER -
