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The concentrations of BTEX (Benzene, Toluene, m,p -xylenes and o-xylene) were monitored at roadsides of three kinds of urban road (open road, cross road and street canyon) in Beijing during 2008-2009. Each sampling was taken with the change of traffic volume at 7:30, 11:30, 14:30 and 17:30. Air samples were pre-concentrated on Tenax-TA tubes, which were analyzed by a GC system coupled with FID in...
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