Abstract
Regardless of many reports describing the formation of regional PM2.5 pollution, it remains unclear how and why regional vs. local characteristics differ among aerosol species especially low molecular weight organic acids (LMWOAs). Here, PM2.5 was sampled simultaneously at Wuhan (megacity site) and Dongting Lake (background site) in Central China, a typical polluted region, from September 2017 to August 2018. High levels of PM2.5 were found at both sites, with SO42--NO3--NH4+ contributing over 60%. Similarity was observed in PM2.5 compositions, despite a 200 km distance between the two sites. More specifically, secondary ions, biomass-burning-related ions (K+ and Cl−), and LMWOAs were dominated by regional contributions, whereas other ions were mainly of local origin. Such high regional contributions might be mainly driven by meteorological homogeneity and, to a lesser extent, by the homogeneity of gaseous precursors. The results highlight the roles of secondary formation of both organic and inorganic aerosols as well as meteorology in the evolution of regional PM2.5 pollution.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
