A designated volatility nonattainment area is an area that is designated as being nonattainment for the ozone National Ambient Air Quality Standard (NAAQS) pursuant to a rulemaking under CAA section 107(d)(4)(A)(ii), and a designated volatility attainment area is an area not designated as being in nonattainment with the NAAQS for ozone.ĭesignations and exact boundaries of the ozone nonattainment areas subject to the 7.8 psi RVP standard were published in the November 6, 1991, notice that designated areas pursuant to CAA section 107(d)(4)(A)(ii). EPA set the Reid Vapor Pressure (RVP) standard at 9.0 psi for designated volatility attainment areas and the RVP standard at 7.8 psi for certain designated volatility nonattainment areas. In response to the 1990 CAA Amendments, EPA amended the volatility regulations. The 1990 Clean Air Act (CAA) Amendments added a new section, 211(h), that prohibited the EPA from establishing a volatility standard more stringent than 9.0 pounds per square inch (psi) in an ozone attainment area, except that EPA may impose a lower (i.e., more stringent) standard in any former ozone nonattainment area that has been redesignated to attainment. Learn more about the RVP federal regulations. Mary Parishes Louisiana Įast Baton Rouge, West Baton Rouge, Livingston, Ascension, and Iberville (the Baton Rouge Area), Louisiana andĬherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding, and Rockdale, Georgia (the Atlanta RVP Area). Raleigh-Durham-Chapel Hill, Greensboro, Winston-Salem, High Point and Charlotte, North Carolina īeauregard, Calcasieu, Jefferson, Lafayette, Lafourche, Orleans, Pointe Coupee, St. In order to relax the more stringent federal 7.8 psi RVP standard the state must submit a revision to the area’s attainment demonstration or maintenance plan demonstrating timely attainment or continued attainment of the ozone NAAQS with the less stringent RVP standard in place and that the RVP relaxation complies with the anti-backsliding requirements in CAA section 110(l).ĮPA has approved relaxation of the summer gasoline RVP standards for a number of states and areas, including: EPA provides a 1.0 psi RVP allowance for gasoline containing 10 percent ethanol. Phase II is applicable to 1992 and later calendar years.ĭepending on the state and month, gasoline RVP may not exceed 9.0 psi or 7.8 psi. Depending on the state and month, gasoline RVP was not to exceed 10.5 pounds per square inch (psi), 9.5 psi, or 9.0 psi. Phase I was applicable to calendar years 1989 through 1991. These rules reduce gasoline emissions of volatile organic compounds (VOC) that are a major contributor to ground-level ozone (smog). EPA regulates the vapor pressure of gasoline sold at retail stations during the summer ozone season (June 1 to September 15) to reduce evaporative emissions from gasoline that contribute to ground-level ozone and diminish the effects of ozone-related health problems.ĮPA established a two-phase reduction in summertime commercial gasoline volatility. RVP is an abbreviation for "Reid vapor pressure," a common measure of and generic term for gasoline volatility. Volatility is the property of a liquid fuel that defines its evaporation characteristics.
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