Effects of Early Pollution Control Measures on Secondary Species of PM_2.5 in Jiaozuo, China.

ABSTRACT: Various measures for reducing air pollution have been promulgated since 2013 in China. To investigate the synergistic results of emission control and meteorological environment, PM_2.5 samples collected from October 2013 to July 2016 and November 2018 to October 2019 in Jiaozuo city were analyzed for their compositions, secondary species (Ss) variations, and factors changing for Ss formation. The results showed that the concentrations of sulfate, nitrate, ammonium, and secondary organic aerosols (SOAs) generally decreased over the same seasonal period during these years. In addition, the concentrations and proportions of each Ss increased with the increase in the PM_2.5 level in these years, implying that although PM_2.5 levels have been reduced by various con

SUBMITTER: Tang J 

PROVIDER: S-EPMC7818311 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature