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EPA’s Tier 3 Motor Vehicle Emission and Fuel Standard rule is designed to reduce air pollution from passenger cars and trucks. When fully implemented with new fuel technology and more advanced, cleaner automobiles, the program will be an important piece of the puzzle and step forward in Utah’s efforts to clean and maintain our air quality.

The new rule targets both new automobile technologies and fuel sulfur levels. Tier 2 standards, implemented over the past several years, significantly reduced fuel sulfur levels from 300 ppm to 30 ppm. The Tier 3 rule will further reduce sulfur on average from 30 ppm to 10 ppm. The Tier 3 rule will be phased in over several years, and Utah's small refineries are required to implement changes by 2020.