The federal Clean Air Act establishes national fuel emission standards, but also allows states to adopt unique fuel programs to meet local air quality needs. The combination of federal and state fuel programs is intended to balance the importance of standard fuel quality across the country with the need for sufficient flexibility to address specific air quality issues at the state or local level.
State fuel programs are sometimes referred to as "boutique." Most of these programs set lower gasoline volatility requirements than the federal standards, and most are effective for only part of the year. For more information on these programs, please view the list of states with boutique fuel programs.
EPA issued a Federal Register notice listing fuels approved in State Implementation Plans (SIPs) as of September 1, 2004. The list includes the states and Petroleum Administration for Defense Districts (PADDs) where the fuels are used. Issuance of this list is required by the Energy Policy Act of 2005.
|Type of Fuel Control||PADD**||Region - State|
|RVP of 7.8 psi||1
|1 - ME1
3 - PA
5 - IN
5 - OH
6 - TX (May 1-Oct. 1)*
|RVP of 7.0 psi||2
|7 - KS
5 - MI
7 - MO
6 - TX
|RVP of 7.0 with gasoline sulfur provisions||1||4 - GA|
|Low Emission Diesel||3||6-TX|
|Cleaner Burning Gasoline (Summer)||5||9 - AZ (May 1 - Sept 30)|
|Cleaner Burning Gasoline (non-Summer)||5||9 - AZ (Oct 1- Apr 30)|
|Winter Gasoline (aromatics & sulfur)||5||9 - NV|
*Dates listed in parentheses refer to summer gasoline programs with different RVP control periods from the federal RVP control period, which runs from June 1 through September 15.
**Petroleum Administration for Defense Districts (PADDs)
1 Androscoggin, Cumberland, Kennebec, Knox, Lincoln, Sagadahoc, and York counties in Maine are now RFG covered areas; however, a SIP requirement of 7.8 psi RVP is still in place. As such, the VOC performance requirement for RFG now also applies.