Tag Archive: tier 3

An Updated Guide to EPA’s Tier 3 Gasoline Sulfur Standards

January 5, 2020 , , , , ,

January 5, 2020 by Mike Leister and E.J. Ledet Effective January 1, 2017, the U.S. Environmental Protection Agency (EPA) began requiring all U.S. gasoline to meet an annual 10 parts per million (ppm) average sulfur requirement as part of its new Tier 3 vehicle and fuel regulations. (Stillwater wrote a quick guide to Tier 3 back then, and it’s still...
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