The cause for increasing of NO, CO and SO_2 concentration during 20: 00 ~ 23: 00 on September. 9 of 2001 is due to weak vertical diffuse and pollutants accumulated at low atmosphere in the night.
造成9月9日夜间20：00～23：00一次污染物NO、CO和SO_2浓度急剧升高的原因是由于夜间稳定情况下，大气的垂直扩散减弱，污染物在底层积累造成的。
The cause for increasing of NO, CO and SO_2 concentration during 20: 00 ~ 23: 00 on September. 9 of 2001 is due to weak vertical diffuse and pollutants accumulated at low atmosphere in the night.
造成9月9日夜间20：00～23：00一次污染物NO、CO和SO_2浓度急剧升高的原因是由于夜间稳定情况下，大气的垂直扩散减弱，污染物在底层积累造成的。
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