Pollution characteristics of atmospheric particulates in chengdu from August to September in 2009 and their relationship with meteorological conditions
Abstract:Daily samples of PM2.5, PM10 were collected at three sites in Chengdu from August to September in 2009 in order to study the temporal and spatial distribution characteristics of atmospheric particulate, and their relationship with meteorological conditions. Average daily mass concentrations of PM2.5 and PM10 were 66 μg/m3 and 94μg/m3 respectively, and both had a wide concentration variation range and the same change trend during the sampling period. The mass concentrations had a spatial distribution characteristics as Panda Base > Caotang Temple > Lidu Garden, which meant that the pollution at the downwind area was most serious, followed by the commercial area and the residential area. In the viewpoint of time distribution characteristics, the atmospheric particulate pollution was most serious in the two periods of September 17th ~ 19th and September 5th ~ 9th with adverse weather conditions and pollutants accumulation being the main reasons. Correlation analysis showed that the correlation coefficient of daily mass concentrations of PM2.5 and PM10 was 0.93, and the ratio of PM2.5/PM10 was 0.69 revealing a significant contribution of PM2.5 to PM10. Temperature had no significant influence on the variation characteristics of the mass concentrations of atmospheric particulate, while precipitation and wind speed had great influence on it mainly through wet clearing and promoting diffusion. Within certain range of relative humidity, high humidity tended to cause severe pollution of atmospheric particulate pollution. A significantly negative correlation existed between the visibility and the concentration of atmospheric particulate, and the correlation coefficient between the visibility and concentration of PM2.5 was greater than that of PM10.
邓利群, 钱骏, 廖瑞雪, 佟洪金. 2009年8~9月成都市颗粒物污染及其与气象条件的关系[J]. 中国环境科学, 2012, 32(8): 1433-1438.
DENG Li-Qun, QIAN Jun, LIAO Rui-Xue, TONG Hong-Jin. Pollution characteristics of atmospheric particulates in chengdu from August to September in 2009 and their relationship with meteorological conditions. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(8): 1433-1438.