Leaded gasoline was slowly phased out after the EPA issued reduction standards in 1973. At that point, the average lead content was 2-3 grams per gallon. By 1986, the number dropped to 1/10 of a gram per gallon. The Clean Air Act completely banned the sale of leaded fuel, effective January 1, 1996. However, “fuel containing lead may continue to be sold for off-road uses, including aircraft, racing cars, farm equipment, and marine engines.”
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