The Quantitative Relationship Between Visibility
And Mass Concentration Of PM2.5 In Beijing
Author(s)
J.-L. Wang, Y.-H. Zhang, M. Shao & X.-L. Liu
Abstract
The pollution of 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 six times that of the US national ambient air quality standards
proposed by US EPA. The major contributors to mass of PM2.5 were organics,
crustal elements and sulfate. The chemical composition of PM2.5 varied largely
with season, but was similar at different monitor stations in the same season. The
fine particles (PM2.5) cause atmospheric visibility deterioration through light
extinction. The mass concentrations of PM2.5 were anti-correlated to the
visibility, the best fits between atmospheric visibility and the mass
concentrations of PM2.5 varied throughout the year: following a power law in
spring, exponential in summer, logarithmic in autumn, and power or exponential
in winter. As in each season the meteorological parameters such as air
temperature and relative humidity change from day to day, the reason for the
above correlations between PM2.5 and visibility obtained at different seasons
probably come from the differences in chemical compositions of PM2.5.
Keywords: PM2.5, atmospheric urban aerosol, air pollution, meteorological
factor, visibility.
1 Introduction
Aerosol is of great concern in current atmospheric chemistry researches (Wang
[9]). The research on physical and chemical properties of aerosol is important for
Keywords
PM2.5, atmospheric urban aerosol, air pollution, meteorological
factor, visibility.
Related Book
Other papers in this volume
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