Modeling particulate matter in central California
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Detailed calculations carried out with the UCD-CIT air quality model predict particulate matter concentrations that are in relatively good agreement with measurements during the CRPAQS winter intensive field study. Source apportionment calculations carried out by the UCD-CIT model predict that the highest carbon concentrations are associated with wood smoke emitted in urban areas within Central California during the cold winter conditions. Regional nitrate concentrations are driven by local emissions of NOx from transportation sources. The majority of the PM2.5 concentrations within any subregion of Central California were associated with emissions from within the same subregion. Pollutants transported long distances in the upper atmosphere did not cause high concentrations at ground level.