期刊
ATMOSPHERIC RESEARCH
卷 218, 期 -, 页码 25-33出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2018.10.010
关键词
Haze; PM2.5; Chemical compositions; Organic tracers; Source apportionment
资金
- National Key R&D Program of China [2017YFCO210000]
- Ministry of Science and Technology of China [2016YFC0202001]
- China National Natural Science Founds for Distinguished Young Scholars [41325014]
- National Nature Science Foundation of China [41773117]
Air pollution in north China is still severe, although Chinese government has exerted great efforts to cut down pollutant emissions in the past decade. To understand the chemistry and sources of the haze particles in north China, PM2.5 aerosols were collected in Beijing from January 7 to February 27, 2014, during which two haze episodes (haze I and haze II) occurred. The samples were analyzed for water soluble inorganic ions, trace elements, sugars, n-alkane, polycyclic aromatic hydrocarbons (PAHs), fatty acids, dicarboxylic acid, EC (elemental carbon) and OC (organic carbon). Our results showed that relative abundances of primary species such as sugars, PAHs and EC were more abundant on the clean days and the haze I period in Beijing, while secondary aerosols especially secondary inorganic aerosol (SIA)were more abundant in the haze II period. Source apportionment further showed that emissions from cooking (21.6%), road-dust (19.4%), coal combustion (17.8%) and biomass burning (15.4%) were the main sources of PM2.5 during the clean days, while biomass burning (20.1%) and coal combustion (17.1%) were the main sources during haze I period. For the haze II period, vehicle exhausts (26.9%), secondary aerosol formation (26.6%) and industrial emission (19.1%) were the dominant sources of PM2.5. Our work suggests that it is indispensable to reduce the emissions from biomass burning and vehicle exhaust in Beijing in order to further mitigate the haze pollution.
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