Chemical composition of emissions from urban sources of fine organic aerosol

Abstract

A dilution source sampling system was used to collect
\nprimary fine aerosol emissions from important sources of
\nurban organic aerosol, including a boiler burning No. 2 fuel
\noil, a home fireplace, a fleet of catalyst-equipped and
\nnoncatalyst automobiles, heavy-duty diesel trucks, natural
\ngas home appliances, and meat cooking operations. Alternative
\ndilution sampling techniques were used to collect
\nemissions from cigarette smoking and a roofing tar pot,
\nand grab sample techniques were employed to characterize
\npaved road dust, brake lining wear, tire wear, and vegetative
\ndetritus. Organic aerosol constituted the majority
\nof the fine aerosol mass emitted from many of the sources
\ntested. Fine primary organic aerosol emissions within the
\nheavily urbanized western portion of the Los Angeles Basin
\nwere determined to total 29.8 metric tons/day. Over 40%
\nof these organic aerosol emissions are from anthropogenic
\npollution sources that are expected to emit contemporary
\n(nonfossil) aerosol carbon, in good agreement with the
\navailable ambient monitoring data.