Abstract:

According to the air pollution monitoring data in Chongqing city during 2003～2008,we analyzed the weather characteristics of the changes of pollution events.The results showed that the major pollutant was PM10 in Chongqing.The consistency of PM10 had a  diurnal fluctuations called “Dual Peaks and Dual Valley”.The pollution weather had obvious seasonal and continuity characteristics that these pollution events mainly occurred from lateautumn to next early spring with continuing period for 2～7 d.The process of the pollution weather had the typical characteristics of atmospheric circulation and weather.Local atmospheric circulations were equipped with low or mean pressure in the lower troposphere and zonal or northwest flows in the upper troposphere,resulting in overcast sky or rainsunshine.In the process of the pollution weather,local meteorological elements had regular changes，such as in 24 h the ground air pressure changed in negative,temperature changed in plus,〖JP2〗average relative humidity was between 72% and 85%,the wind speed changed little and kept 1～2 m/s,lowlevel inversion was evident.When the pollution weather was over,air pressure would pick up obviously,temperature would drop，and the relative humidity would increase.〖