The Influence of Synoptic Pattern on PM10 Heavy Air Pollution in Beijing
造成北京PM10重污染的二类典型天气形势

PM10 heavy air pollution events(API great than 3 grades) in Beijing area have been researched by analyzing air quality data and NCEP reanalysis data.1)The days of PM10 heavy air pollution in Beijing area are only about 10 days,but air pollution days related with them maybe accounted about 40%~50% of total air pollution days in Beijing.So,the study on synoptic pattern resulting in PM10 heavy air pollution is very important for the forecast and project of PM10 heavy air pollution and the control and management of air pollution sources.2)By using objective analytical method of surface air pressure,two typical types of synoptic patterns,which often result in PM10 heavy air pollution in Beijing area and around,was defined,that are the blocking pattern of moving southward anticyclone and the weak anticyclone pattern related to moving northward tropical cyclone.