SEASONAL VARIATION,SOURCE AND LIGHT EXTINCTION CONTRIBUTION OF WATER-SOLUBLE INORGANIC IONS OF PM2.5 IN THE NORTHERN SUBURB OF ANYANG,CHINA
Seasonal variation,source characteristics as well as light extinction contribution of water-soluble inorganic ions(WSIIs)in PM2.5 were explored in the northern suburb of Anyang.Gaseous pollutants,PM2.5 samples,and their chemical components were online monitored from March 2018 to February 2019.The results showed that the annual average concentrations of PM2.5 and WSIIs were(76.68±73.00)μg/m3 and(45.60±34.17)μg/m3,respectively,which showed obvious seasonal variation with the maximum values in winter,and the minimum values in summer.NH4 most likely existed in the form of(NH4)2SO4,NH4NO3,and NH4C1 in four seasons at the observation sites.The main sources of WSIIs were secondary nitrate,secondary sulfate,dust,and combustion source by using positive matrix factorization(PMF).Furthermore,the revised IMPROVE algorithm was used to estimate the extinction coefficient(best).The results illustrated that the extinction contribution of SNA could reach 67％.Finally,typical pollution episodes were explored in winter in this study.Continuous emission and accumulation of pollutants under unfavorable metrological conditions was the major cause of the PM2.5 pollution events at this site.Meanwhile,a rapid increase of SNA,especially SO42-,can lead to higher PM2.5 concentrations.Hence,the control of SNA is not only conducive to the reduction of regional PM2.5 concentration,but also to improving atmospheric visibility.
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