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Gasoline samples (n=20) collected from San Francisco Bay area refineries and service stations had mercury concentrations ranging from 0.08 to 1.4ngg −1 ; diesel samples (n=19) had concentrations of 0.05–0.34ngg −1 . These relatively low levels show little evidence for mercury enrichment or contamination into these fuels from the refining process. Combustion of these fuels in the San...