A Study On The Characteristics Of PM₁₀ And Its Meteorological Factors In The Main Cities Of Northern China

In recent years, with the rapid development of scale and economic of cities, the air pollution in cities of particulate matter (PM10) for the primary air pollutants is increasingly serious, which has become one of the important indicators of urban living environment because of its harm to residents’ physical health, further study of spatial and temporal variation characteristics of PM10pollution and its relationship with meteorological elements and weather situation and reveal the change rule and cause have theoretical and practical significance, therefore, this paper mainly studied the particulate matter (PM10) data and the meteorological data of the17major cities in north China from2000to2012(including Lanzhou, Xining, Yinchuan, Urumqi, Xi’an, Taiyuan, Zhengzhou, Hohhot, Beijing, Shijiazhuang, Jinan, Qingdao, Tianjin, Shenyang, Dalian, Changchun and Harbin), obtained the following conclusion:1, The characteristics of interannual and monthly change of the PM10concentration have following situation, the PM10concentration in Dalian and Qingdao has been on the rise but which in other cities has been reduced in2000-2012, especially the interannual trend of PM10concentration in Shijiazhuang and Taiyuan was very obvious, The monthly change of PM10concentration was consistent in all cities, the peak of PM10concentration appeared in winter and spring but the value was different, the lowest value appeared in august and september, This rule of seasonal change Illustrated that the atmospheric pollution mainly was soot and dust in China.2, The PM10concentration have significant differences on the region in the northern city of China, the high value area of PM10concentration is mainly in the northwest region and the beijing-tianjin-hebei region, such as Lanzhou, Urumqi,Shijiazhuang and Beijing. 3, The temperatures and PM10concentration was not a simple linear relationship in different season, but there was a temperature threshold of PM10concentration peak (and change with regional and time), on both sides of that the change of PM10concentration with the temperature was inconsistent and nonlinear.4, Compared the meteorological elements on air quality in major cities in North China as "heavy pollution" and "excellent", analyzed the typical pollution case, and reached the conclusion that spring air pollution was mainly for outside dust conveyor type, the winter air pollution was mainly for the local source pollution.5, Compared the meteorological elements and PM10concentrations in the northern city of Lanzhou and the southern city of Shanghai and and reached the conclusion that the concentration of PM10in distribution is consistent, continuous precipitation scavenging rate of PM10were obviously. PM10concentration in Lanzhou city was significantly higher than that of Shanghai city; clear degree of Shanghai PM10of wind speed were higher than that of Lanzhou.