Characteristics and Aging of Traffic-Emitted Particles with Sulfate and Organic Compound Formation in Urban Air

Traffic is a major source of anthropogenic aerosol in urban atmosphere. In this study, particles were measured with TEM-EDX system at the roadside main road northwestern part Beijing, China, under clear and hazy conditions. Soot, organic, sulfur-rich (S-rich), mineral, metal particles, as well mixtures, frequently encountered aerosols. Under conditions, S-rich coated organic matter (S-OM particles) accounted for most total (15% to 24%), followed by soot (18% 21%), (17% non-mixed (10% 18%), soot-, mineral-, or metal-inclusions (here referred S-inclusion (11% 15%). dominant components, while mineral secondary among which, ~14% had sulfate core OM coating; inclusions mixture often mixed cores. core–OM shell structure ratio diameter whole particle was ~0.52 conditions ~0.60 indicating substantial formation on particles. Soot 18% 21% The relative growth aged higher than sum, from traffic emissions matter.