The US Environmental Protection Agency (EPA) issued the Mobile Source Toxics (MSAT) Rule on February 26, 2007 (40 CFRParts 59, 80, 85 and 86). This rule required refiners to reduce the average benzene concentration in the gasoline pool to 0.62 vol% or less by January 1, 2011. Refiners producing higher levels could reduce their concentration by purchasing credits, but they are capped at a maximum actual average concentration of 1.3 vol%.
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