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DOI	10.1016/j.atmosenv.2020.117542
	Impacts of precursors on peroxyacetyl nitrate (PAN) and relative formation of PAN to ozone in a southwestern megacity of China
	Sun M.; Cui J.; Zhao X.; Zhang J.
发表日期	2020
ISSN	1352-2310
卷号	231
英文摘要	Peroxyacetyl nitrate (PAN), an important species of photochemical smog, has received much concern for its impact on atmospheric chemistry and relation with other pollutants including ozone (O3). This study conducted PAN measurements at the CS site (urban area) and the NQ site (suburban area) of Chongqing in summer in 2015. Maximum PAN concentrations were 12.17 (mean: 2.05 ± 1.94 ppbv) and 8.53 ppbv (mean: 0.84 ± 0.89 ppbv) at the CS and NQ sites, respectively. An observation-based box model coupled with RACM2 was applied to explore PAN formation mechanisms and its key precursors. Results showed that PAN formation was limited by both nitrogen dioxides (NOX) and volatile organic compounds (VOCs) at both sites, and NOX and nitrous acid were essential PAN precursors, especially on polluted days. For VOCs, key first-generation precursors were identified as alkenes and aromatics at the CS site (aromatics and isoprene at the NQ site). On polluted days, the relative production efficiency of PAN to O3 enhanced more significantly at the NQ site (0.9 times) than at the CS site (0.4 times), which was related to formation/destruction reactivities of PAN and O3. Furthermore, this study firstly explored the quantitative impacts of precursors to the relative formation of PAN to O3, and the results indicated that NOX predominated their relative formation at both sites. For VOCs, urban alkenes and suburban aromatics contributed to elevated PAN formation relative to O3, and the increase of aromatics dominated the PAN enhancement relative to O3 during the polluted period. © 2020 Elsevier Ltd
关键词	Ozone Peroxyacetyl nitrate Photochemical pollution Precursors
语种	英语
scopus关键词	Air pollution; Aromatization; Atmospheric chemistry; Nitrates; Nitrogen oxides; Olefins; Ozone; Peroxides; Volatile organic compounds; Formation mechanism; Nitrogen dioxides; Nitrous acid; Peroxyacetyl nitrates; Photochemical smog; Production efficiency; Suburban areas; Urban areas; Urban growth; nitrogen dioxide; nitrous acid; ozone; peroxyacetylnitrate; volatile organic compound; atmospheric chemistry; isoprene; megacity; nitrogen dioxide; nitrous acid; ozone; peroxyacetyl nitrate; smog; volatile organic compound; Article; China; circadian rhythm; exhaust gas; maximum concentration; meteorology; photolysis; precursor; priority journal; summer; urban area; China; Chongqing
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249166
作者单位	State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Sun M.,Cui J.,Zhao X.,et al. Impacts of precursors on peroxyacetyl nitrate (PAN) and relative formation of PAN to ozone in a southwestern megacity of China[J],2020,231.
APA	Sun M.,Cui J.,Zhao X.,&Zhang J..(2020).Impacts of precursors on peroxyacetyl nitrate (PAN) and relative formation of PAN to ozone in a southwestern megacity of China.ATMOSPHERIC ENVIRONMENT,231.
MLA	Sun M.,et al."Impacts of precursors on peroxyacetyl nitrate (PAN) and relative formation of PAN to ozone in a southwestern megacity of China".ATMOSPHERIC ENVIRONMENT 231(2020).