Proposed Rule:
Transportation Conformity Rule:
PM2.5 and PM10 Amendments
The U.S. Environmental Protection Agency (EPA) is proposing
changes to the transportation conformity rule that primarily
concern conformity's implementation in PM2.5 and PM10 nonattain-
ment and maintenance areas.
• EPA is proposing to update the transportation conformity
regulation in light of the October 17, 2006, final rule that
strengthened the 24-hour PM2.5 standard and revoked the
annual PM10 standard.
• EPA is also proposing to clarify the regulations concerning
project-level air quality analyses to address a court's remand of
the transportation conformity hot-spot requirements for further
explanation.
This proposed rule would ensure that air quality is protected and
would clarify requirements for implementers.
EPA has worked closely with the U.S. Department of Transportation
in the development of this proposed rule.
Background
Transportation conformity is a Clean Air Act requirement that ensures that federally
supported highway and transit projects are consistent with state air quality imple-
mentation plans. Conformity helps protect public health through early consider-
ation of the air quality impacts of transportation decisions in places where air quality
does not currently meet federal standards or has not met them in the past.
United States
Environmental Protection
Agency
Office of Transportation and Air Quality
EPA-420-F-09-005
May 2009
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Key Elements of the Proposed Rule
The proposed rule directly supports EPA's broader strategy for implementing the revised 2006
PM2.5 National Ambient Air Quality Standard (NAAQS). Providing clear guidance on how to
implement transportation conformity under this NAAQS would ensure that transportation and
air quality planning is coordinated and that clean air is achieved.
The proposed rule describes when conformity first applies in 2006 PM2.5 nonattainment areas.
The Clean Air Act and transportation conformity rule allow a one-year grace period before
conformity applies for the revised NAAQS. This grace period begins upon the effective date of
EPA's nonattainment designation.
The proposed rule also describes the general requirements for demonstrating conformity for the
2006 PM2.5 NAAQS, including the regional emissions test(s) that would apply before and after
SIP motor vehicle emissions budgets are established for the revised NAAQS. A motor vehicle
emissions budget (or "budget") is the level of emissions from cars and trucks that the state has
determined to be consistent with local air quality goals. EPA is proposing that all 2006 PM2.5
nonattainment areas without SIP budgets would have a choice of conformity emissions tests for
ensuring that transportation decisions are consistent with clean air. Under the proposal, SIP
budgets for the existing 1997 PM2.5 NAAQS would be used for conformity prior to establish-
ing 2006 PM2.5 SIPs. Using existing 1997 PM2.5 SIP budgets in the interim would ensure that
progress continues towards achieving the 2006 PM2.5 NAAQS,
The proposed rule would update the baseline year for the interim emissions test in 2006 PM2.5
nonattainment areas. EPA is seeking comment on several proposed options.
The proposed rule would clarify which budgets PM10 nonattainment and maintenance areas
would use for transportation conformity determinations, now that the annual PM10 standard
has been revoked.
The proposed rule would clarify that federally funded or approved highway and transit projects
in PM2.5, PM10 and CO nonattainment and maintenance areas must not delay timely attain-
ment or achievement of other interim milestones.
Health and Environmental Benefits
The proposed rule would improve the health and environmental benefits of the existing trans-
portation conformity program. The proposed rule would ensure that new PM2.5 nonattainment
areas and existing PM10 nonattainment and maintenance areas use conformity tests that ensure
that air quality progress continues in areas that need to attain or maintain federal air quality
standards. The proposed rule would also clarify that hot-spot analyses are performed in a man-
ner consistent with the Clean Air Act's public health and environmental requirements.
Public Participation Opportunities
We welcome your comments on this proposed rule. Comments will be accepted for 30 days
beginning when this proposal is published in the Federal Register.
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All comments should be identified by Docket ID No. EPA-HQ-OAR-2008-0540 and submitted
by one of the following methods:
• Internet: www.regulations.gov
• E-mail: a-and-r-docket@epa.gov
• Fax: (202) 566-9744
• Mail:
Air Docket, Environmental Protection Agency
Mail Code: 2822T
1200 Pennsylvania Avenue NW
Washington, DC 20460
• Hand Delivery:
EPA West Building
EPA Docket Center (Room 3334)
1301 Constitution Avenue NW
Washington, D.C.
If a public hearing is requested within ten days after publication of the proposed rule in the
Federal Register, it will be held in Ann Arbor, Michigan approximately 20 days after publication
of the proposed rule in the Federal Register, Additional information about the hearing will be
printed in the Federal Register, Please see the proposed rule for additional information about the
hearing.
For More Information
You can access documents on transportation conformity on EPA's Office of Transportation and
Air Quality Web site at: www.epa.gov/otaq/stateresources/transconf
For further information on this proposed rule, please contact
Laura Berry
U.S. Environmental Protection Agency
Office of Transportation and Air Quality
2000 Traverwood Drive,
Ann Arbor, MI 48105
734-214-4858
E-mail: berry.laura@epa.gov
Or
Patty Klavon
U.S. Environmental Protection Agency
Office of Transportation and Air Quality
2000 Traverwood Drive,
Ann Arbor, MI 48105
734-214-4476
E-mail: klavon.patty@epa.gov
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