Relationship between atmospheric pollution and sandy weather in Shijiazhuang

Based on hourly meteorological and environmental monitoring data from 2002 to 2006 in shijiazhuang,the effects of sandy weather on air pollution were analyzed with 8 typical cases of sandy weather.The results showed that the main pollutant in sandy weather was PM210.Both the middle extent pollution days and the more serious pollution days happened in the day or next day of sandy weather.Pollution sources causing sandy weather could be divided into three types,i.e.outside pollution type,local pollution type and mixed pollution type.Of all,the local pollution type was mainly influenced by the cold front.And there was a positive correlation between PM10 concentration and wind speed.While the outside pollution type was often controlled by weak pressure filed,and PM10 concentration had a negative correlation with the south wind.When the wind veered to the north,it was favorable to pollutant accumulation.