Ethanol and Air Quality – Separating Fact from Fiction

On October 9, President Trump announced that he was directing EPA to allow year-round sales of E15 (15 percent ethanol, 85 percent gasoline), and it is expected that the EPA will release a Notice of Proposed Rulemaking in the coming weeks to allow the sale of higher blends of ethanol.  After Tuesday’s announcement, the oil industry and some environmental groups were quick to claim that increasing the volume of ethanol in the fuel supply would worsen air quality. However, the evidence suggests otherwise. 

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To Contact the Editor: Jessie Stolark at

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