期刊
ATMOSPHERIC ENVIRONMENT
卷 152, 期 -, 页码 354-361出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2016.12.056
关键词
PAHs; NPAHs; Air pollution; Source control measure; Beijing
资金
- Ministry of Education, Culture, Sports, Science [21256001, 21120503, 21590132, 23406004, 24590769, 24406020]
- Global Environment Research Fund from the Ministry of Environment, Japan [5-1306]
- National Natural Science Foundation of China [21677152]
- Grants-in-Aid for Scientific Research [24406020, 21120503, 24590769, 17K08388, 17H06283, 16H05625, 21590132, 23406004] Funding Source: KAKEN
Airborne particulates were collected at an urban site (site 1) from 2004 to 2010 and at a suburban site (site 2) in 2010 in Beijing. Nine polycyclic aromatic hydrocarbons (PAHs) and five nitropolycyclic aromatic hydrocarbons (NPAHs) in the airborne particulates were determined by HPLC with fluorescence and chemiluminescence detection, respectively. The concentrations of PAHs and NPAHs were higher in heating season than in non-heating season at the two sites. Both the concentrations of PAHs and NPAHs decreased in the non-heating season but only the concentrations of NPAHs decreased in heating season at site 1, from 2004 to 2010. These findings suggest that source control measures implemented by the city of Beijing helped to reduce air pollution in Beijing. The concentrations of PAHs increased at site 1 in 2010, possibly because of the transport of emissions from windward other areas, such as Shanxi province. Several diagnostic ratios of PAHs and NPAHs showed that the different sources contributed to Beijing's air pollution, although coal combustion was the main source in the heating season and vehicle emission was the main source in the non-heating season. An analysis of physical parameters at Beijing showed that high wind speed can remove atmospheric PAHs and NPAHs in the heating season and that high relative humidity can remove them in the non-heating season. (C) 2017 Elsevier Ltd. All rights reserved.
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