This study analyzed the characteristics of air pollution and specific pollution periods within the HarbinChangchun(HC)metropolitan area during 2014e2020.Regarding annual,seasonal,and monthly variations of the six po...This study analyzed the characteristics of air pollution and specific pollution periods within the HarbinChangchun(HC)metropolitan area during 2014e2020.Regarding annual,seasonal,and monthly variations of the six pollutants,the change trend in 11 cities of HC showed strong consistency in spatial distribution.The western cities(Songyuan,Daqing,and Siping)were vulnerable to dust storms from Inner Mongolia.The concentrations of all air pollutants,except O3-8h,showed downward fluctuation trends from 2014 to 2018 and remained stable from 2018 to 2020 in terms of annual variations.The interannual trend of significant reductions in SO2 and SO2/PM2.5 during the heating period indicated that strict emission reduction measures posed by the government were highly successful.The ratio of PM2.5/SO2 was used to identify open biomass burning(OBB),which showed a double peak(OctobereNovember(OcteNov),MarcheApril(MareApr)).The burning prohibition shifted the OBB from OcteNov to Mar eApr.展开更多
基金This work was supported by the National Natural Science Foundation of China(41805097).
文摘This study analyzed the characteristics of air pollution and specific pollution periods within the HarbinChangchun(HC)metropolitan area during 2014e2020.Regarding annual,seasonal,and monthly variations of the six pollutants,the change trend in 11 cities of HC showed strong consistency in spatial distribution.The western cities(Songyuan,Daqing,and Siping)were vulnerable to dust storms from Inner Mongolia.The concentrations of all air pollutants,except O3-8h,showed downward fluctuation trends from 2014 to 2018 and remained stable from 2018 to 2020 in terms of annual variations.The interannual trend of significant reductions in SO2 and SO2/PM2.5 during the heating period indicated that strict emission reduction measures posed by the government were highly successful.The ratio of PM2.5/SO2 was used to identify open biomass burning(OBB),which showed a double peak(OctobereNovember(OcteNov),MarcheApril(MareApr)).The burning prohibition shifted the OBB from OcteNov to Mar eApr.
