气候变化领域集成服务门户(CCPortal): Remarkable nucleation and growth of ultrafine particles from vehicular exhaust

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DOI	10.1073/pnas.1916366117
	Remarkable nucleation and growth of ultrafine particles from vehicular exhaust
	Guo S.; Hu M.; Peng J.; Wu Z.; Zamora M.L.; Shang D.; Du Z.; Zheng J.; Fang X.; Tang R.; Wu Y.; Zeng L.; Shuai S.; Zhang W.; Wang Y.; Ji Y.; Li Y.; Zhang A.L.; Wang W.; Zhang F.; Zhao J.; Gong X.; Wang C.; Molina M.J.; Zhang R.
发表日期	2020
ISSN	0027-8424
起始页码	3427
结束页码	3432
卷号	117 期号:7
英文摘要	High levels of ultrafine particles (UFPs; diameter of less than 50 nm) are frequently produced from new particle formation under urban conditions, with profound implications on human health, weather, and climate. However, the fundamental mechanisms of new particle formation remain elusive, and few experimental studies have realistically replicated the relevant atmospheric conditions. Previous experimental studies simulated oxidation of one compound or a mixture of a few compounds, and extrapolation of the laboratory results to chemically complex air was uncertain. Here, we show striking formation of UFPs in urban air from combining ambient and chamber measurements. By capturing the ambient conditions (i.e., temperature, relative humidity, sunlight, and the types and abundances of chemical species), we elucidate the roles of existing particles, photochemistry, and synergy of multipollutants in new particle formation. Aerosol nucleation in urban air is limited by existing particles but negligibly by nitrogen oxides. Photooxidation of vehicular exhaust yields abundant precursors, and organics, rather than sulfuric acid or base species, dominate formation of UFPs under urban conditions. Recognition of this source of UFPs is essential to assessing their impacts and developing mitigation policies. Our results imply that reduction of primary particles or removal of existing particles without simultaneously limiting organics from automobile emissions is ineffective and can even exacerbate this problem. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Growth; New particle formation; Nucleation; Organics; Ultrafine particles
语种	英语
scopus关键词	ammonia; hydrocarbon; nitrate; sulfate; sulfuric acid; toluene; volatile organic compound; air pollution; air temperature; Article; concentration (parameter); exhaust gas; humidity; hydrogen bond; limit of detection; membrane permeability; particle size; particulate matter; photochemistry; photolysis; photooxidation; priority journal; solar radiation; sunlight; thermodynamics; wind; air pollutant; chemistry; exhaust gas; oxidation reduction reaction; particle size; particulate matter; temperature; Air Pollutants; Oxidation-Reduction; Particle Size; Particulate Matter; Temperature; Vehicle Emissions
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/161053
作者单位	Guo, S., State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Hu, M., State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Peng, J., Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States, Department of Chemistry, Texas A&M University, College Station, TX 77843, United States, Center for Urban Transport Emission Research, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China; Wu, Z., State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Zamora, M.L., Depar...
推荐引用方式 GB/T 7714	Guo S.,Hu M.,Peng J.,et al. Remarkable nucleation and growth of ultrafine particles from vehicular exhaust[J],2020,117(7).
APA	Guo S..,Hu M..,Peng J..,Wu Z..,Zamora M.L..,...&Zhang R..(2020).Remarkable nucleation and growth of ultrafine particles from vehicular exhaust.Proceedings of the National Academy of Sciences of the United States of America,117(7).
MLA	Guo S.,et al."Remarkable nucleation and growth of ultrafine particles from vehicular exhaust".Proceedings of the National Academy of Sciences of the United States of America 117.7(2020).