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Chemical characteristics of PM2.5 during haze episodes in spring 2013 in Beijing.
Urban Climate, DOI: 10.1016/j.uclim.2016.01.003 (2015)
A continuous daily PM2.5 sampling campaign from 10 April till 8 June 2013, including three haze episodes, was conducted in Beijing. Chemical species, including EC, OC, water-soluble ions and inorganic elements, were analysed by a thermal/optical carbon analyser, IC and ICP-MS, respectively. A comparison of air quality during such haze episodes in relation to clear air situations, as well as the differences between the haze episodes was emphasised. The results showed that the most important fractions of PM2.5 during haze were SO4 2-, NO3 - and NH4 + (namely, SNA) which together accounted for 54-61% of the total PM2.5 mass. Estimated secondary organic carbon (SOC) was also found to be increased during haze, but the relative increase compared to clear days was much lower than for SNA, leading to a decrease in relative contribution of SOC to PM2.5 in the observed haze events. Cluster analyses from back trajectories showed four air mass clusters during spring 2013 and air flow, which was from the south-easterly directions, might favour the accumulation of PM2.5, especially SNA and anthropogenic elements. All these results proved that the anthropogenic air pollution in the Southeast of Beijing was responsible for the formation of hazes in Beijing during spring 2013.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Back Trajectory ; Cluster Analyses ; Haze ; Pm2.5 Characteristics ; Pm2.5 Chemical Composition ; Sna
ISSN (print) / ISBN
2212-0955
e-ISSN
2212-0955
Journal
Urban Climate
Publisher
Elsevier
Publishing Place
Amsterdam [u.a.]
Non-patent literature
Publications
Reviewing status
Peer reviewed