EPA's Approval of a Request from
Louisiana to Relax the Federal
Summer Gasoline Volatility Standard
in the Baton Rouge Area
r I 4ie U.S. Environmental Protection Agency (EPA) is issuing a
JL final rule to relax the federal Reid Vapor Pressure (RVP) standard
applicable to gasoline sold in the five Louisiana parishes of East Baton
Rouge, West Baton Rouge, Livingston, Ascension, and Iberville (the
Baton Rouge Area). This final action amends EPA's regulations to

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•	This final rule is in response to an April 10, 2017 request from Louisiana to relax the
federal summertime gasoline volatility requirements for 16 parishes, including the five
parishes covered by this final action. EPA approved Louisiana's request to relax summer-
time gasoline volatility requirements for the other 11 parishes in a separate rulemaking
on December 26, 2017 (82 FR 60886).
•	Finalizing this rule is based on a separate EPA rulemaking that approved a revised CAA
section 175 A maintenance plan for the Baton Rouge Area showing that the relaxation
of the federal RVP gasoline requirement will not interfere with continued maintenance
of the 2008 ozone national ambient air quality standard (NAAQS) or any other applica-
ble NAAQS, including the 2015 ozone NAAQS. Louisiana submitted the section CAA
175 A maintenance plan revision with a section 110(1) non-interference demonstration
to EPA on January 30, 2018, and EPA finalized its approval of the State's submission
on May 25, 2018 (83 FR 24226). EPA also notes that on June 4, 2018 the Baton Rouge
Area was designated as an attainment/unclassifiable area for the 2015 ozone NAAQS
(83 FR 25776).
•	Relaxing the volatility requirements for gasoline sold in the five Louisiana parishes could
be beneficial because this action will improve the fungibility of gasoline in the Baton
Rouge Area by allowing the gasoline sold in the five parishes to be identical to the
summertime fuel sold in the rest of Louisiana. For motorists, the change in summertime
gasoline volatility performance should be virtually unnoticed.
Background
In 1987, EPA determined that gasoline nationwide had become increasingly volatile, causing an
increase in evaporative emissions from gasoline-powered vehicles and equipment. Evaporative
emissions from gasoline, referred to as volatile organic compounds (VOCs), are precursors to
the formation of tropospheric ozone and contribute to the nation's ground-level ozone problem.
Ground-level ozone causes health problems, including damaged lung tissue, reduced lung func-
tion, and lung sensitization to other pollutants.
The most common measure of fuel volatility is RVP. To provide for cleaner air and greater public
health protection, EPA enforces maximum limits on the RVP of gasoline sold during the sum-
mer ozone season. Specifically, EPA's regulations at 40 CFR 80.27(a)(2) establish maximum
RVP standards of 9.0 psi or 7.8 psi depending on the state, the month, and the area's initial
ozone designation with respect to the ozone NAAQS.
To relax the applicable federal RVP standard in an area where the more stringent federal RVP
of 7.8 psi is required, EPA believes such relaxation is best accomplished if an area is designated
as (or redesignated to) attainment. If the redesignated area is still covered by a Clean Air Act
(CAA) section 175A maintenance plan requirement, then it must also submit a revised main-
tenance plan demonstrating continued attainment of the ozone NAAQS with the less stringent
RVP standard in place.

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For More Information
You can access the rule and related documents on EPA's Office of Transportation and
Air Quality Web site at:
www.epa.gov/otaq/fuels/gasolinefuels/volatility/index.htm
For further information on this final rule, please contact:
David Dickinson
U.S. Environmental Protection Agency
Office of Transportation and Air Quality
1200 Pennsylvania Ave, NW
Washington, DC 20460
202-343-9256
E-mail: dickinson.david@epa.gov
Or
Rudy Kapichak
U.S. Environmental Protection Agency
Office of Transportation and Air Quality
2000 Traverwood Drive
Ann Arbor, MI 48105
734-214-4574
E-mail: kapichak.rudolph@epa.gov

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