Sources of fine organic aerosol. 2. Noncatalyst and catalyst-equipped automobiles and heavy-duty diesel trucks

摘要: Gasoline- and diesel-powered vehicles are known to contribute appreciable amounts of inhalable fine particulate matter the atmosphere in urban areas. Internal combustion engines burning gasoline diesel fuel more than 21% primary organic carbon emitted Los Angeles atmosphere. In present study, (d[sub p] [le] 2 [mu]m) exhaust emissions from six noncatalyst automobiles, seven catalyst-equipped two heavy-duty trucks examined by gas chromatography/mass spectrometry. The purposes this study as follows: (a) search for conservative marker compounds suitable tracing presence vehicular atmosphere, (b) compile quantitative source profiles, (c) contributions More 100 quantified, including n-alkanes, n-alkanoic acids, benzoic benzaldehydes, PAH, oxy-PAH, steranes, pentacyclic triterpanes, azanaphthalenes, others. Although fossil markers such steranes triterpanes can be other sources, it shown that their ambient concentrations measured attributable mainly emissions. 102 refs., 9 figs., 6 tabs.