Secondary organic aerosol formation from naphthalene roadway emissions in the South Coast Air Basin of California Online publication date: Fri, 28-Feb-2014
by Alexander Cohan; Arantzazu Eiguren-Fernandez; Antonio H. Miguel; Donald Dabdub
International Journal of Environment and Pollution (IJEP), Vol. 52, No. 3/4, 2013
Abstract: Naphthalene is the simplest and most abundant polycyclic aromatic hydrocarbon (PAH) in California fuels, with concentrations of up to 2,600 mg L−1 in gasoline and 1,600 mg L−1 in diesel fuel. In this work, naphthalene emission factors for gasoline and diesel vehicles are combined with an activity-based automobile inventory to characterise anthropogenic naphthalene emissions in the South Coast Air Basin of California (SoCAB). A three-dimensional air quality model is used to examine transport and chemical reaction losses of naphthalene in the SoCAB. Inclusion of naphthalene emissions from on-road gasoline and diesel vehicles was found to increase modelled SOA growth by up to 10%. Hence, reductions of naphthalene from both gasoline and diesel fuels may be an effective means of reducing the emissions of an important SOA-forming precursor to the atmosphere of large urban centres with characteristics similar to the SoCAB. The implications of these findings are discussed.
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