Humidity plays an important role in the PM2.5 pollution in Beijing

doi:10.1016/j.envpol.2014.11.028

CORC > 北京大学 > 环境科学与工程学院

	Humidity plays an important role in the PM2.5 pollution in Beijing
	Cheng, Yuan ; He, Ke-bin ; Du, Zhen-yu ; Zheng, Mei ; Duan, Feng-kui ; Ma, Yong-liang
刊名	environmental pollution
	2015
关键词	PM2.5 Chemical composition Meteorological parameter SOA Aqueous-phase reaction MASS SIZE DISTRIBUTIONS CHEMICAL CHARACTERISTICS SOURCE APPORTIONMENT AEROSOL CHINA WATER NITRATE PARTICLES MECHANISM EMISSIONS
DOI	10.1016/j.envpol.2014.11.028
英文摘要	Heavily-polluted PM2.5 (fine particulate matter) episodes frequently impacting Beijing, especially during winter, have become a substantial concern. We found that during winter, the daily variation of PM2.5 in Beijing tracked the pattern of relative humidity (RH). With the increase of PM2.5 (or RH), water-soluble components (especially inorganic ions) became more abundant, and the water-soluble organic carbon to organic carbon ratios increased. The nitrate to sulfate ratios also exhibited dependence on RH, and were higher than those measured about a decade ago, consistent with the increasing trend of nitrogen oxides emissions. Surprisingly, the ratios of water-insoluble organic carbon to elemental carbon showed significant increase at high RH levels, presumably indicating the formation of secondary organic aerosol that is not soluble in water. In addition, humid winters were occasionally identified during 1996-2013 which are expected to be favorable for the formation of air pollution episodes with high PM2.5 concentrations. (C) 2014 Elsevier Ltd. All rights reserved.; Environmental Sciences; SCI(E); EI; PubMed; 0; ARTICLE; ycheng@mail.tsinghua.edu.cn; hekb@tsinghua.edu.cn; 68-75; 197
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/188728]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Cheng, Yuan,He, Ke-bin,Du, Zhen-yu,et al. Humidity plays an important role in the PM2.5 pollution in Beijing[J]. environmental pollution,2015.
APA	Cheng, Yuan,He, Ke-bin,Du, Zhen-yu,Zheng, Mei,Duan, Feng-kui,&Ma, Yong-liang.(2015).Humidity plays an important role in the PM2.5 pollution in Beijing.environmental pollution.
MLA	Cheng, Yuan,et al."Humidity plays an important role in the PM2.5 pollution in Beijing".environmental pollution (2015).