Reducing secondary organic aerosol formation from gasoline vehicle exhaust.

ABSTRACT: On-road gasoline vehicles are a major source of secondary organic aerosol (SOA) in urban areas. We investigated SOA formation by oxidizing dilute, ambient-level exhaust concentrations from a fleet of on-road gasoline vehicles in a smog chamber. We measured less SOA formation from newer vehicles meeting more stringent emissions standards. This suggests that the natural replacement of older vehicles with newer ones that meet more stringent emissions standards should reduce SOA levels in urban environments. However, SOA production depends on both precursor concentrations (emissions) and atmospheric chemistry (SOA yields). We found a strongly nonlinear relationship between SOA formation and the ratio of nonmethane organic gas to oxides of nitrogen (NO_x) (NMOG:NO_x), which

SUBMITTER: Zhao Y 

PROVIDER: S-EPMC5502599 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature