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The underprediction of ambient secondary organic aerosol (SOA) levels bycurrent atmospheric models in urban areas is well established, yet the causeof this underprediction remains elusive. Likewise, the relative contributionof emissions from gasoline- and diesel-fueled vehicles to the formation ofSOA is generally unresolved. We investigate the source of these twodiscrepancies using data from the 2010 CalNex experiment carried out in theLos Angeles Basin (Ryerson et al., 2013). Specifically, we use gas-phaseorganic mass (GPOM) and CO emission factors in conjunction with measuredenhancements in oxygenated organic aerosol (OOA) relative to CO to quantifythe significant lack of closure between expected and observed organic aerosolconcentrations attributable to fossil-fuel emissions. Two possibleconclusions emerge from the analysis to yield consistency with the ambientdata: (1) vehicular emissions are not a dominant source of anthropogenicfossil SOA in the Los Angeles Basin, or (2) the ambient SOA mass yields usedto determine the SOA formation potential of vehicular emissions are substantiallyhigher than those derived from laboratory chamber studies

Emission factor ratios, SOA mass yields, and the impact of vehicular emissions on SOA formation