Chemical composition and quantitative relationship between meteorological condition and fine particles in Beijing.
The recent year's monitor results of Beijing indicated that the pollution level of fine particles PM2.5 showed an increasing trend. To understand pollution characteristics of PM2.5 and its relationship with the meteorological conditions in Beijing, a one-year monitoring of PM2.5 mass concentration and correspondent meteorological parameters was performed in Beijing in 2001. The PM2.5 levels in Beijing were very high, the annual average PM2.5 concentration in 2001 was 7 times of the National Ambient Air Quality Standards proposed by US EPA. The major chemical compositions were organics, sulfate, crustals and nitrate. It was found that the mass concentrations of PM2.5 were influenced by meteorological conditions. The correlation between the mass concentrations of PM2.5 and the relative humidity was found. And the correlation became closer at higher relative humidity. And the mass concentrations of PM2.5 were negtive-correlated to wind speeds, but the correlation between the mass concentration of PM2.5 and wind speed was not good at stronger wind.
Wang
Jing-Li
JL
Institute of Urban Meteorology, CMA, Beijing 100089, China. wjingli123@163.com
Zhang
Yuan-Hang
YH
Shao
Min
M
Liu
Xu-Lin
XL
Zeng
Li-Min
LM
Cheng
Cong-Lan
CL
Xu
Xiao-Feng
XF
D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D006813:Humidity; D010316:Particle Size; D012621:Seasons; D013052:Spectrometry, X-Ray Emission; D013997:Time Factors; D014887:Weather; D014919:Wind
D000393:Air Pollutants