Yang Y.,Beijing Municipal Environmental Monitoring Center |
Yang Y.,Beijing Municipal Key Laboratory of Atmospheric Particulate Monitoring Technology |
Li J.,Beijing Municipal Environmental Monitoring Center |
Li J.,Beijing Municipal Key Laboratory of Atmospheric Particulate Monitoring Technology |
And 13 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015
In the study, 491 PM2.5 samples from 10 sites in Beijing were collected in the campaign from August 2012 to July 2013 and used to analyze the major sources of PM2.5. Five types of point source emissions, two types of mobile emissions and four types of fugitive emissions were defined and the chemical mass balance (CMB) model was used to conduct source apportionment analysis. Results indicated that the major sources of PM2.5 were organic matter (20%), secondary nitrate (20%), secondary sulfate (16%), motor vehicle (16%), coal burning (15%), soil dust (6%) and unidentified (7%). Compared with the previous results, the contribution from coal burning declined, while that of secondary inorganic matter and organic matter increased. Source apportionment of the key components showed that 25% of sulfates came from coal-burning boiler emission and 17% of OM emitted by motor vehicle. The source of each site was quite different, showing the characteristics of local pollutant source emission. To improve the air quality in Beijing City, it is important to take action regionally to reduce PM2.5 and precursor gases emissions. In the meanwhile, the local traffic and coal-burning emission should be more strictly controlled. ©, 2015, Science Press. All right reserved.