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DOI	10.1016/j.atmosenv.2020.117770
	Roles of RH, aerosol pH and sources in concentrations of secondary inorganic aerosols, during different pollution periods
	Gao J.; Wei Y.; Shi G.; Yu H.; Zhang Z.; Song S.; Wang W.; Liang D.; Feng Y.
发表日期	2020
ISSN	1352-2310
卷号	241
英文摘要	Secondary inorganic aerosols (SIA, including sulfate, nitrate, and ammonium) were found to be the most dominant aerosol components during haze period. Elucidating the driving factors during liquid-phase reaction formation process of SIA is a key step for understanding the origin of airborne particulate pollution. In this work, we used online instruments and collected hourly concentrations of ions, gases, meteorological parameters in a northern city of China. Source emissions were estimated by receptor model PMF/ME2 pulling run solution (Partial Target Transformation-PMF: PTT-PMF), and six sources were identified (dust, coal combustion, vehicle exhaust, secondary sulfate, secondary nitrate and biomass burning & SOC). pH values were calculated by ISORROPIA-II, with an average value of 4.68. The relationships between RH, pH, source behaviors and concentrations of SIA during different pollution episodes were discussed. Source emissions were found to influence pH and subsequently the SIA; high RH could result in high SIA because aerosol water content in atmosphere increases with RH, which is favorable for liquid-phase reactions. Finally, we employed statistical and machine learning (Random forest classification: RFC) methods to analysis importance of driving factors on SIA formation during different pollution episodes. Results showed precursors, wet conditions, atmospheric oxidation capacity and acidity favor formation of sulfate and nitrate at different pollution levels; changes of gaseous precursors, RH and temperature are more important to determine PM2.5 pollution classification (clean, slightly polluted, moderately polluted, heavily polluted episodes). The findings of this work can provide useful information for better understanding formation mechanism of SIA, mitigating air pollution and improving human health. © 2020 Elsevier Ltd
关键词	Aerosol pH Gaseous precursors Machine learning RH Secondary inorganic aerosols Source apportionment
语种	英语
scopus关键词	Aerosols; Coal combustion; Coal dust; Decision trees; Nitrates; Random forests; Sulfur compounds; Airborne particulate; Atmospheric oxidation capacity; Formation mechanism; Liquid-phase reaction; Meteorological parameters; On-line instruments; Random forest classification; Secondary inorganic aerosol; Air pollution; ammonia; coal; nitrate; sulfate; water; aerosol; atmospheric pollution; biomass burning; concentration (composition); haze; pH; pollutant source; urban area; acidity; aerosol; air pollution; Article; biomass; China; combustion; concentration (parameter); controlled study; dust; exhaust gas; gas; haze; human; liquid; meteorology; oxidation; particulate matter; pH; PM2.5 exposure; pollution; priority journal; random forest; water content; China; Sia
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/248946
作者单位	State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL 32816, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; College of Computer Science, Nankai University, Tianjin, 300350, China
推荐引用方式 GB/T 7714	Gao J.,Wei Y.,Shi G.,et al. Roles of RH, aerosol pH and sources in concentrations of secondary inorganic aerosols, during different pollution periods[J],2020,241.
APA	Gao J..,Wei Y..,Shi G..,Yu H..,Zhang Z..,...&Feng Y..(2020).Roles of RH, aerosol pH and sources in concentrations of secondary inorganic aerosols, during different pollution periods.ATMOSPHERIC ENVIRONMENT,241.
MLA	Gao J.,et al."Roles of RH, aerosol pH and sources in concentrations of secondary inorganic aerosols, during different pollution periods".ATMOSPHERIC ENVIRONMENT 241(2020).