4 . 6 The chemical composition of fine particles and quantitative relationship between the mass concentration and meteorological condition in Beijing ∗
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Quantitative relationship between visibility and mass concentration of PM2.5 in Beijing.
The pollution of particulate matter less than 2.5 microm (PM2.5) is a serious environmental problem in Beijing. The annual average concentration of PM2.5 in 2001 from seasonal monitor results was more than 6 times that of the U.S. national ambient air quality standards proposed by U.S. EPA. The major contributors to mass of PM2.5 were organics, crustal elements and sulfate. The chemical composi...
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