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| Photo chemical property and source of particles during contunious episodes in October 2011 in Beijing |
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Abstract The gaseous pollutants, particles and single particles were observed in October 2011 in Beijing. Here we analyzed the relationship between primary pollutants, physical and chemical properties of single particles, and photochemical properties of air masses. The origination of the air masses was analyzed combining with back trajectories. The result show that in October there were three obvious pollution episodes: in the first episode, the air masses were found to be regional and photochemical aged, which originated from the border of Hebei and Shandong Province. The air masses during the second episode mainly came from Hebei Province and mixed with local air masses with short photochemical age. During the third one, the air masses characterized as freshly emitted plume, which were supposed to originate from Beijing, Tianjin or areas in Mid-North of Hebei Province.
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Received: 20 January 2013
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