The Air District is authorized to regulate stationary sources of air emissions in the Bay Area, but mobile sources – such as cars, trucks, trains and construction equipment – actually contribute most of the air pollution in the region.
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5/16/2012Board of Directors Special Meeting More Information: 5/16/2012 Agenda (442 kb PDF, 8 pgs)
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4/18/2012 Board of Directors Meeting More Information: 4/18/2012 Agenda (4 Mb PDF, 315 pgs)
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Quantifying Intra- and Inter-basin Pollutant Transport
District staff have used various data analysis, meteorological, and photochemical modeling applications to study intra- and inter-air basin pollutant transport. Air flow regimes within the Bay Area were studied to determine the source contributions to observed ozone and PM levels in various areas of the District. Air flow regimes were also studied between the Bay Area and the Central Valley for summertime ozone and wintertime PM transport. During the winter months, PM concentrations are higher in the Central Valley compared to the Bay Area because of the Central Valley’s meteorology, which permits high PM levels. These elevated concentrations travel westward under certain meteorological conditions, contributing significantly to PM levels in the Bay Area. A technical report detailing staff findings will be available soon.