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Sulfur naturally occurs in gasoline and diesel fuel, contributing to pollution when the fuel is burned. Beginning in 2004, standards were set on the amount of sulfur in gasoline (Tier 2 standards). Separate standards were set for different entities, such as large refiners, small refiners, importers, downstream wholesalers, etc. In March 2014, Tier 3 standards were finalized by the Environmental Protection Agency (EPA). Tier 3 standards take effect in 2017. Large refinery standards are shown below, both the maximum and average per gallon. See the Environmental Protection Agency website for additional details on sulfur standards.

EPA Gasoline Sulfur Standards, 2004-On

Graph of the gasoline surfur standards for 2004, 2005, 2006 and 2017-on. See table for more detailed information.

Note: N/A = not applicable.

Supporting Information

EPA Gasoline Sulfur Standards, 2004-On
  Sulfur Standards
(Parts per Million)
  2004 2005 2006 2017-on
Per Gallon Maximum 300 300 80 80
Per Gallon Average N/A 30 30 10
U.S. Environmental Protection Agency Tier 2 Vehicle and Gasoline Sulfur Program and Tier 3 Vehicle Emission and Fuel Standards Program

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