Unspeciated organic emissions from combustion sources and their influence on the secondary organic aerosol budget in the United States.

ABSTRACT: Secondary organic aerosol (SOA) formed from the atmospheric oxidation of nonmethane organic gases (NMOG) is a major contributor to atmospheric aerosol mass. Emissions and smog chamber experiments were performed to investigate SOA formation from gasoline vehicles, diesel vehicles, and biomass burning. About 10-20% of NMOG emissions from these major combustion sources are not routinely speciated and therefore are currently misclassified in emission inventories and chemical transport models. The smog chamber data demonstrate that this misclassification biases model predictions of SOA production low because the unspeciated NMOG produce more SOA per unit mass than the speciated NMOG. We present new source-specific SOA yield parameterizations for these unspeciated emissions. These parameterizati

SUBMITTER: Jathar SH 

PROVIDER: S-EPMC4115499 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature