Size-resolved particulate matter composition in Beijing during pollution and dust events

摘要: Each spring, Beijing, China, experiences dust storms which cause high particulate matter concentrations. Beijing also has many anthropogenic sources of including the large Capitol Steel Company. On basis measured size segregated, speciated concentrations, and calculated back trajectories, three types pollution events occurred in from 22 March to 1 April 2001: storms, urban events, an industrial event. For each event type, source element is determined be soil or profiles are created that characterize composition. Dust associated with winds traveling desert regions total suspended particle (TSP) PM2.5 Sixty-two percent TSP due elements oxides 98% soil. Urban have smaller concentrations but 49% soil, indicating a major component even when there not active storm. The characterized by southwest, location Company, mass acidic ion highest during as Mn, Zn, As, Rb, Cd, Cs Pb These can used tracers for steel mill complex. potentially more detrimental human health than higher toxic