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This page contains policy guidance issued by EPA and/or the U.S. Department of Transportation (DOT) to assist States in implementing the transportation conformity program. Policy guidance can be found on the following topics:
Contact: Rudy Kapichak, phone: (734) 214-4574, email: kapichak.rudolph@epa.gov
About PDF Files
| Transportation Planning and Conformity Requirements |
| Companion Guidance for the July 1, 2004, Final Transportation Conformity Rule: Conformity Implementation in Multi-jurisdictional Nonattainment and Maintenance Areas for Existing and New Air Quality Standards (EPA420-B-04-012, July 2004) |
| This guidance document describes how the rule's requirements for conformity determinations apply in areas that contain more than one MPO, a donut area, parts of more than one state, or any combination. It expands on the July 1, 2004, final conformity rule by including additional detail, examples, and pictorial representations of boundary scenarios that are present in the field. |
917K PDF (47 pp.) |
| Contact: Laura Voss Berry, phone: (734) 214-4858, email: berry.laura@epa.gov |
| Federal Highway Administration Guidance for Qualitative Project Level "Hot Spot" Analysis in PM-10 Nonattainment and Maintenance Areas |
| This document, issued in September, 2001, provides guidance and suggested approaches for performing a qualitative analysis of highway and transit projects in areas that are designated nonattainment or maintenance for particulate matter less than or equal to 10 microns in diameter. |
822K DOC |
81K PDF |
| Contact: Meg Patulski, phone: (734) 214-4842, email: patulski.meg@epa.gov |
| US Department of Transportation's (DOT) Guidance on Plan Requirements in Nonattainment and Maintenance Areas |
FHWA and FTA's May 25 2001 Memorandum:
This document provides clarification on the implementation of the three-year transportation plan update requirements in nonattainment and maintenance areas. |
| Contact: Angela Spickard, phone: (734) 214-4283, email: spickard.angela@epa.gov |
| OTAQ Guidance on Conformity Frequency Requirements: Application of 40 CFR 93.104(e) to Houston Attainment SIP |
| May 9, 2001, Memorandum: This document further clarifies EPA's position on interpreting the conformity regulations as they apply to the status and applicability of initially submitted SIP budgets that EPA finds inadequate (incorporates the April 23, 2001, memorandum). |
15K WPD |
250K PDF |
| April 23, 2001 Memorandum: This document clarifies EPA's interpretation ofthe conformity regulations as they apply to the status and applicability of initially submitted SIP budgets that EPA finds inadequate |
9K WPD |
165K PDF |
| Contact: Laura Voss Berry, phone: (734) 214-4858, email: berry.laura@epa.gov |
| EPA and DOT Joint Guidance on Use of Latest Planning Assumptions in Conformity Determinations |
| This January 18, 2001 guidance memorandum clarifies EPA's and DOT's expectations for implementing the transportation conformity rule's requirements for use of latest planning assumptions in conformity determinations. This memorandum also reiterates EPA's expectations for using latest planning assumptions in the development of motor vehicle emission budgets in state implementation plans. |
73K
PDF |
| Contact: Meg Patulski, phone: (734) 214-4842, email: patulski.meg@epa.gov |
| March
2, 1999 Conformity Court Decision |
| EPA's Conformity Guidance on Implementation of March 2, 1999, Conformity Court Decision (EPA420-F-99-025, May 1999) |
| This guidance includes details about using submitted budgets in conformity, EPA's new adequacy review process, non-federal projects, SIP disapprovals, and certain safety margins consistent with the court decision. EPA released this guidance on May 14, 1999. |
46K
PDF |
| US DOT's Revised Guidance
for the Implementation of March 2, 1999, Conformity Court Decision. This guidance document was released on January 2, 2002, and supersedes and replaces all previous FHWA and FTA guidance implementing the Court's decision, including the supplemental guidance issued on June 18, 1999. It covers projects that can proceed during a conformity lapse. |
"Revised Guidance for Implementing the March 1999 Circuit Court Decision Affecting Transportation Conformity."
US DOT's February 7, 2002 Federal Register Notice announcing their revised guidance on projects that can proceed during a conformity lapse. This notice provides DOT's rational and justification for revising the guidance |
48K
PDF |
| May 20, 2003, FHWA/FTA Guidance: Clarification of Transportation Conformity Requirements for FHWA/FTA Projects Requiring Environmental Impact Statements |
107K
PDF |
| April 9, 2003, FTA Guidance: Revised FTA Procedures for a conformity lapse. (Addresses funding and approval of FTA projects during a conformity lapse.) |
2.3M
PDF |
| June 10, 1999, Federal Register Notice: Adequacy Status of Submitted State Implementation Plans for Transportation Conformity Purposes |
| Contact Laura Voss Berry, phone: (734) 214-4858, email: berry.laura@epa.gov |
| Emission Models and Conformity |
| Clarification of Question 5 of Policy Guidance for MOBILE6 SIPs in Mid-course Review Areas |
| This memorandum clarifies the approach for determining that attainment SIPs in mid-course review areas continue to demonstrate attainment with revised MOBILE6 inventories. The EPA memorandum was issued on February 12, 2003.
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113K
PDF |
| Contact: Gary Dolce, phone: (734) 214-4414, email: dolce.gary@epa.gov |
| Policy Guidance on Use of MOBILE6 for SIP Development and Transportation Conformity |
| This memorandum describes how and when to use MOBILE6 in state implementation plan development and transportation conformity determinations. The time period requirements set forth in this policy document became effective upon publication of the January 29, 2002 Federal Register notice of availability that announced EPA's approval of the new model for official purposes. |
105K
PDF |
| January 29, 2002, Federal Register Notice of Availability:
Official Release of the MOBILE6 Motor Vehicle Emissions Factor Model |
48K
PDF |
| Contact: Meg Patulski, phone: (734) 214-4842, email: patulski.meg@epa.gov |
| Use of EMFAC2002 Model in California |
| April 1, 2003 Federal Register Notice of Availability: Official Release of EMFAC2002 Motor Vehicle Emission Factor Model for use in the State of California |
47K
PDF |
| Contact: Meg Patulski, phone: (734) 214-4842, email: patulski.meg@epa.gov or Karina O/Connor, Region 9, phone (775) 833-1276 or email: oconnor.karina@epa.gov |
| Use of EMFAC2000 and EMFAC2001 Models in California |
| This memorandum describes EPA's intentions to approve new EMFAC emissions models for state implementation plan development, and clarifies when these new models will be required for transportation conformity analyses in California. |
17K
WPD |
17K
PDF |
| Federal Register Notice of Availability: Official Release of EMFAC2000 Motor Vehicle Emission Factor Model for use in the San Francisco Bay Area, California |
38K
PDF |
| Contact: Meg Patulski, phone: (734) 214-4842, email: patulski.meg@epa.gov or Karina O/Connor, Region 9, phone (775) 833-1276 or email: oconnor.karina@epa.gov |
| SIPS and Conformity |
Guidance on Quantifying NOx Benefits for Cetane Improvement Programs for use in SIPs and Transportation Conformity
(EPA420-B-04-005, June 2004) |
| Thisdocument, issued in June 2004, provides guidance on quantifying emission reductions from the use of cetane improvement additives in diesel fuel. These emission reductions may be used either to meet state implementation plan requirements such as reasonable further progress or attainment or in transportation conformity determinations. |
253K
PDF |
Guidance for Quantifying Long Duration Truck Idling Emission Reductions in State Implementation Plans and Transportation Conformity
(EPA420-B-04-001, January 2004) |
| The January 2004 Long Duration Truck Idling Emission Reduction Guidance provides information on quantifying emission reductions from the use of technologies which reduce long duration truck idling emissions. These emission reductions may be used either to meet state implementation plan requirements such as reasonable further progress or attainment or in transportation conformity determinations.
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379K
PDF |
| EPA Policy Guidance on the Adoption and Use of SIP Transportation Control Measure Substitution Mechanisms |
| On April 7, 2004, EPA issued policy guidance that describes the adoption and use of transportation control measure (TCM) substitution mechanisms. A TCM substitution mechanism provides flexibility by establishing a process by which TCMs in an approved state implementation plan (SIP) can be removed and replaced with substitute TCMs without the need for EPA to conduct notice and comment rulemaking on the individual substitutions. |
630K
PDF |
| Currently, EPA has approved TCM substitution mechanisms in Portland, Oregon, and the State of Texas. EPA recommends that States or areas that are considering adopting such a mechanism use the Portland or Texas SIPs as a starting point for developing their TCM substitution mechanism. |
| Portland, Oregon, TCM Substitution Mechanism |
148K
PDF |
| Texas TCM Substitution Mechanism |
289K
PDF |
| Contact: Rudy Kapichak, phone: (734) 214-4574, fax: (734) 214-4052, email: kapichak.rudolph@epa.gov |
| Guidance on Motor Vehicle Emissions Budgets in One-Hour Ozone Attainment Demonstrations in Serious and Severe Ozone Nonattainment Areas |
| This November 3, 1999 memo includes information about establishing a motor vehicle emissions budget, by when budgets must be established, what constitutes an adequate budget, date extensions, Tier 2 and adequacy, and what areas must do when additional emission reductions are necessary. |
229K
PDF |
| One-Hour Ozone Attainment Demonstrations and Tier 2/Sulfur Rulemaking in Serious and Severe Ozone Nonattainment Areas |
| This November 8, 1999 memo provides information about the relationship between one-hour ozone attainment demonstrations and the emissions achieved by the Tier2/sulfur rulemaking and provides emission data related to that rulemaking. |
856K
PDF |
| Land-Use and Conformity |
| Comparing Methodologies to Assess Transportation and Air Quality Impacts of Brownfields and Infill Development, October 2001 (EPA-231-R-01-001, August 2001) |
| This document describes four methods for characterizing the air quality benefits resulting from infill development, compares these methodologies, and examines their advantages and disadvantages. It also includes the June 7, 2001 guidance memo listed directly below . |
17K PDF |
| Guidance on Applicable Methodologies to Account for the Benefits of Infill in SIPs and Conformity Determinations, June 7, 2001 |
| This memo guides the use of the four methods in preparing SIPs and transportation conformity determinations. |
28K WPD |
142K PDF |
| Contact: Laura Berry, OTAQ, phone: (734) 214-4858, email: berry.laura@epa.gov or Mary Kay Santore, OPEI, phone (202) 260-8745 or email: santore.marykay@epa.gov |
Final Policy Guidance: Improving Air Quality Through Land Use Activities. January 2001
This document discusses how to include land use activities in a SIP. It includes examples of land use activities and discusses requirements. (See Chapter 8 for conformity requirements and examples.) |
| Announcement |
9K WPD |
6K PDF |
| "Improving Air Quality Through Land Use Activities" Brochure |
3M PDF |
"Improving Air Quality Through Land Use Activities", Complete Report
(EPA420-R-01-001, January 2001) |
358K ZIP WPD |
1.9M PDF |
| Contact: Laura Voss Berry, phone: (734) 214-4858, email: berry.laura@epa.gov |
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