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Estimates of the amount of secondary organic aerosol formed in the atmosphere from the degradation of&#x0D;traffic C6-C12 hydrocarbon emissions in the city of Athens are presented. Around 1.26 tn of organic aerosol&#x0D;is estimated to be produced during a six hours air pollution episode from the aromatic hydrocarbons,&#x0D;the other NMHC groups contributing an additional 0.2 tn. The main contributor to the SOA production is&#x0D;m-xylene. It accounts, together with toluene, for around 50% of the produced organic aerosol. The main&#x0D;aerosol products that are expected to form from the Athens NMHC traffic mixture are nitrophenols. Due&#x0D;to predominant wind flow to the S-SE direction in the area, a portion of these aerosols is likely to contribute&#x0D;to the SOA burden of the marine atmosphere over SE Mediterranean. These results are also relevant to&#x0D;ozone abatement strategies involving species-specific NMHC reductions and affecting fine particulate&#x0D;composition and concentrations.

Estimation of secondary organic aerosol (SOA) production from traffic from the city of Athens