Regulation of Fuels and Fuel Additives: Federal Volatility Control Program in the Denver-Boulder-Greeley-Ft. Collins-Loveland, CO, 1997 8-Hour Ozone Nonattainment Area

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This action establishes an applicable standard of 7.8 pounds per square inch (psi) Reid vapor pressure (RVP) under the federal volatility control program in the Denver-Boulder-Greeley-Ft. Collins- Loveland, Colorado, 1997 8-hour ozone nonattainment area during the high ozone season--June 1st to September 15th of each year-- beginning in 2010. This action requires the use of 7.8 psi RVP gasoline in Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and Jefferson counties, and in portions of Larimer, and Weld counties.