Abstract
This paper reports altitude-resolved concentrations of sulfur dioxide (SO 2) and particulate matter up to 10 microns in diameter (PM 10) in the planetary boundary layer of major urban centers during extreme pollution episodes. The concentration of SO 2 was observed continuously from November 24, 2004, to December 4, 2004, in Beijing during the heating period. Fluorescence SO 2 analyzers were used to measure the atmospheric SO 2 concentrations. Four SO 2 analyzers were placed at 4 different levels (8 m, 47 m, 120 m, and 280 m) of the 325-m high meteorological observation tower of the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences. A maximal SO 2 concentration of 172.3 ppb was measured during this pollution episode, and SO 2 concentration increased with altitude and reached its maximal value at ∼50 m. The study also analyzed the meteorological situation before, during, and after the pollution episode.
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