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Source apportionment modeling provides valuableinformation on the contributions of different source sectors and/or sourceregions to ozone (O3) or fine particulate matter (PM2.5)concentrations. This information can be useful in designing air qualitymanagement strategies and in understanding the potential benefits ofreducing emissions from a particular source category. The Comprehensive Airquality Model with Extensions (CAMx) offers unique source attribution tools,called the Ozone and Particulate Source Apportionment Technology(OSAT/PSAT), which track source contributions. We present results from aCAMx source attribution modeling study for a summer month and a winter monthusing a recently evaluated European CAMx modeling database developed forPhase 3 of the Air Quality Model Evaluation International Initiative(AQMEII). The contributions of several source sectors (including modelboundary conditions of chemical species representing transport of emissionsfrom outside the modeling domain as well as initial conditions of thesespecies) to O3 or PM2.5 concentrations in Europe were calculatedusing OSAT and PSAT, respectively. A 1-week spin-up period was used toreduce the influence of initial conditions. Evaluation focused on 16 majorcities and on identifying source sectors that contributed above 5 %.Boundary conditions have a large impact on summer and winter ozone in Europeand on summer PM2.5, but they are only a minor contributor to winterPM2.5. Biogenic emissions are important for summer ozone andPM2.5. The important anthropogenic sectors for summer ozone aretransportation (both on-road and non-road), energy production andconversion, and industry. In two of the 16 cities, solvent andproduct also contributed above 5 % to summertime ozone. For summertimePM2.5, the important anthropogenic source sectors are energy, transportation, industry, and agriculture. Residential woodcombustion is an important anthropogenic sector in winter for PM2.5over most of Europe, with larger contributions in central and eastern Europeand the Nordic cities. Other anthropogenic sectors with large contributionsto wintertime PM2.5 include energy, transportation, and agriculture

Source-sector contributions to European ozone and fine PM in 2010 using AQMEII modeling data