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Study on influence factors of urban aerosol on visibility & extinction coefficient

Xu Pengwei~(1),Tan Xiangping~(1),Cai Juzhen ~(2),Liu Jinsong~(3).(1.Environmental Science Research & Design Institute of Zhejiang Province,Hangzhou Zhejiang 310007;2.Zhejiang Province Climate Center,Hangzhou Zhejiang 310021;3.Zhejiang Province Environmental Monitoring Station,Hangzhou Zhejiang 310012)  
For understanding the relation between visibility decline and air pollution in Hangzhou,authors observed the ambient particle concentration of PM_(2.5) and PM_(10) from May 2001 to May 2002,analyzed the visibility under rain-free weather condition,calculated the extinction causing by aerosol and vapor molecule,found that mainly factor on visibility decline is the extinction of minuteness particles in atmosphere.Base on the statistics the seasonal differences of visibility,extinction coefficient,aerosol concentration,PM_(2.5)/PM_(10) ratio and relative humidity,finally,the regress models of visibility and extinction coefficient forecast are established.
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