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PM2.5 samples were collected from three monitoring sites including Handan Iron & Steel Group (Han Gang), Environmental Monitoring Center in Handan (Huan Bao Ju) and Hebei University of Engineering (Kuang Yuan) in Handan urban area for typical months of four seasons. The water-soluble ions, elements and carbonaceous components were analyzed. A coupled PM2.5 source apportionment approach, combining emission inventory, receptor model and source-oriented model, was used to identify PM2.5 source contributions in Handan urban area. The results show that the annual PM2.5 concentration in Handan urban area was 85.5µg/m3. The concentration in autumn and winter was significantly higher than other seasons. The PM2.5 concentration in Han Gang site was slightly higher than that in other sites. The components in PM2.5 with higher proportion were NO3-, SO42-, POA, SOA and NH4+, accounted for 15.7%, 14.5%, 13.2%, 12.2% and 12.4% of the total PM2.5 concentration, respectively, presenting obvious secondary and organic pollution characteristics. The proportion of secondary and organic components in winter was slightly higher than that in other seasons. The primary organic aerosol (POA) and secondary organic aerosol (SOA) in Huan Bao Ju site was slightly higher than that in other sites. Metallurgy and dust emission were the main sources of PM2.5 concentration. The contribution was 27.0% and 18.7%, respectively. The contribution ratio of metallurgy in spring and summer was higher than that in other seasons. The contribution ratio in Han Gang site was significantly higher than other sites. © 2019, Editorial Board of China Environmental Science. All right reserved.
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