| March 14, 2012 | Transportation Conformity Rule Restructuring Amendments; Final Rule - Federal Register, Vol. 77, No. 50, page 14979, March 14, 2012. EPA promulgated revisions to the transportation conformity rule to restructure several sections of the rule so that they apply to any anew or revised NAAQS. EPA did not take final action on the proposal that areas analyze a near-term analysis year when using the budget test. |
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| February 27, 2012 | Transportation Conformity Rule: MOVES Regional Grace Period Extension; Final Rule - Federal Register, Vol. 77, No. 38, page 11394, February 27, 2012. EPA promulgated a revision to the transportation conformity rule to extend the grace period before MOVES is required for regional emissions analyses for transportation conformity determinations by one year (March 2, 1013). |
| October 13, 2011 | Transportation Conformity Rule: MOVES Regional Grace Period Extension; Proposed Rule - Federal Register, Vol. 76, No. 198, October 13, 2011. EPA proposed to extend the grace period by one year before MOVES is required for regional emissions analyses for transportation conformity determinations (March 2, 2013). |
| August 13,2010 | Transportation Conformity Rule Restructuring Amendments; Proposed Rule - Federal Register, Vol. 75, No. 156, August 13, 2010. EPA proposed to restructure several sections of the transportation conformity so they would apply to any new or revised NAAQS. EPA also proposed that a near-term year would have to be analyzed when using the budget test when an area’s attainment date has passed or has not been established. |
| March 24, 2010 | Transportation Conformity Rule PM2.5 and PM10 Amendments; Final Rule - Federal Register, Vol. 75, No. 56, page 14260, March 24, 2010. EPA promulgated revisions to the transportation conformity rule to address the 2006 24-hour PM2.5 NAAQS, revocation of the annual PM10 NAAQS, and a court remand concerning hot-spot analyses in PM2.5, PM10 and CO areas. |
| May 15, 2009 | Transportation Conformity Rule PM2.5 and PM10 Amendments; Proposed Rule - Federal Register, Vol. 74, No. 93, page 23024, May 15, 2009. EPA proposed to amend the transportation conformity rule to address the 2006 24-hour PM2.5 NAAQS, revocation of the annual PM10 NAAQS, and a court remand concerning hot-spot analyses in PM2.5, PM10 and CO areas. |
| January 24, 2008 | Transportation Conformity Rule Amendments to Implement Provisions Continued in the 2005 Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU); Final Rule - Federal Register, Vol. 73, No. 16, page 4419, January 24, 2008. EPA promulgated revisions to the transportation conformity rule to make it consistent with Clean Air Act section 176(c) as amended by SAFETEA-LU. |
| May 2, 2007 | Transportation Conformity Rule Amendments to Implement Provisions Contained in the 2005 Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU); Proposed rule - Federal Register, Vol. 72, No. 84, page 24472, May 2, 2007. EPA proposed to amend the transportation conformity rule to make it consistent with Clean Air Act section 176(c) as amended by SAFETEA-LU. |
| March 10, 2006 | PM2.5 and PM10 Hot-Spot Analyses in Project-Level Transportation Conformity Determinations for the New PM2.5 and Existing PM10 National Ambient Air Quality Standards - Federal Register, Vol. 71, No. 47, page 12468, March 10, 2006. EPA promulgated revisions to the transportation conformity rule establishing criteria for determining which transportation projects must be analyzed for local particle emissions impacts in PM2.5 and PM10 nonattainment and maintenance areas. Final Rule Summary. |
| June 1, 2005 | Transportation Conformity Rule Amendments for the New PM2.5 National Ambient Air Quality Standard: PM2.5 Precursors; Correction - Federal Register, Vol. 70, No. 104, page 31354, June 1, 2005. Notice to correct two errors in the preamble to the May 1, 2005 final rule. |
| May 6, 2005 | Transportation Conformity Rule Amendments for the New PM2.5 National Ambient Air Quality Standard: PM2.5 Precursors - Federal Register, Vol. 70, No. 87, page 24280, May 6, 2006. EPA promulgated revisions to the transportation conformity rule for the consideration of PM2.5 precursors in conformity determinations. |
| December 13, 2004 | Options for PM2.5 and PM10 Hot-Spot Analyses in the Transportation Conformity Rule Amendments for the New PM2.5 and Existing PM10 National Ambient Air Quality Standards; Supplemental Notice of Proposed Rule - Federal Register, Vol. 69, No. 238, page 72140, December 13, 2004. EPA requested further comment and proposed additional options to amend the transportation conformity rule regarding the consideration of localized PM2.5 and PM10 emissions impacts of individual transportation projects. |
| July 20, 2004 | Transportation Conformity Rule Amendments for the New 8-Hour Ozone and PM2.5 National Ambient Air Quality Standards and Miscellaneous Revisions for Existing Areas; Transportation Conformity Rule Amendments: Response to Court Decision and Additional Rule Changes; Correction to the Preamble - Federal Register, Vol. 69, No. 138, page 43325, July 20, 2004. Notice to correct two errors in the preamble to the July 1, 2004 final rule. |
| July 1, 2004 | Transportation Conformity Amendments for the New 8-Hour Ozone and PM2.5 National Ambient Air Quality Standards and Miscellaneous Revisions for Existing Areas; Transportation Conformity Rule Amendments: Response to Court Decision and Additional Rule Changes; Final Rule - Federal Register, Vol. 69, No. 126, page 40004, July 1, 2004. EPA promulgated revisions to the transportation conformity rule to include criteria and procedures for the new 8-hour ozone and fine particulate matter (PM2.5) national ambient air quality standards, and to address a March 2, 1999 court decision. Final Rule Summary and Highlights.
NOTE:On October 20, 2006, the DC Circuit U.S. Court of Appeals vacated 40 CFR 93.109(e)(2)(v). 8-hour ozone areas that do not have adequate or approved 8-hour budgets can no longer utilize this provision to use the interim emissions tests instead of their 1-hour budgets to demonstrate conformity. Please see: (Circuit Court Ruling) |
| November 5, 2003 | Transportation Conformity Amendments for the New 8-Hour Ozone and PM2.5 National Ambient Air Quality Standards and Miscellaneous Revisions for Existing Areas; Proposed Rule - Federal Register, Vol. 68, No. 214, page 62690, November 5, 2003. EPA proposed to amend the transportation conformity rule to include criteria and procedures for the new 8-hour ozone and fine particulate matter (PM2.5) national ambient air quality standards. |
| June 30, 2003 | Transportation Conformity Amendments: Response to Court Decision and Additional Rule Changes; Proposed Rule - Federal Register, Vol. 68, No. 125, page 38974, June 30, 2003. EPA proposed to amend the transportation conformity rule to address a March 2, 1999 court decision. |
| August 6, 2002 | Transportation Conformity Amendments: Minor Revision of 18-Month Requirement for Initial SIP Submissions and Addition of Grace Period for Newly Designated Nonattainment Areas; Final Rule - Federal Register, Vol. 67, No. 151, page 50808, August 6, 2002. EPA promulgated two minor revisions to the transportation conformity rule. |
| October 5, 2001 | Transportation Conformity Amendments: Minor Revision of 18-Month Requirement for Initial SIP Submissions and Addition of Grace Period for Newly Designated Nonattainment Areas; Proposed Rule - Federal Register, Vol. 66, No. 194, page 50954, October 5, 2001. EPA proposed two minor revisions to the transportation conformity rule. |
| April 10, 2000 | Transportation Conformity Amendment: Deletion of Grace Period; Final Rule - Federal Register, Vol. 65, No. 69, page 18911, April 10, 2000. EPA eliminated a provision of the transportation conformity rule that was overturned by court decision. |
| November 30, 1999 | Transportation Conformity Amendment: Deletion of Grace Period; Proposed Rule - Federal Register, Vol. 64, No. 229, page 66832, November 30, 1999. EPA proposed to delete a provision of the transportation conformity rule that was overturned by court decision. |
| March 18, 1999 | Transportation ConformityRule Amendment for the Transportation Conformity Pilot Program; Final Rule - Federal Register, Vol. 64, No. 52, page 13476, March 18, 1999. EPA finalized the amendment to the transportation conformity rule which allows EPA to create and implement a conformity pilot program. |
| August 15, 1997 | Transportation Conformity Rule Amendments: Flexibility and Streamlining; Final Rule - Federal Register, Vol. 62, No. 158, page 43780, August 15, 1997. EPA promulgated a clarified and more flexible transportation conformity rule. |
| July 9, 1996 | Transportation Conformity Rule Amendments: Flexibility and Streamlining; Proposed Rule - Federal Register, Vol. 61, No. 132, page 36112, July 9, 1996. EPA proposed a more streamlined and flexible transportation conformity rule. |
| July 9, 1996 | Transportation Conformity Rule Amendment and Solicitation for Participation in the Transportation Conformity Pilot Program; Proposed Rule - Federal Register, Vol. 61, No. 132, page 35994, July 9, 1996. EPA proposed to amend the transportation conformity rule to allow EPA to create and implement a conformity pilot program. |
| November 14, 1995 | Transportation Conformity Rule Amendments: Miscellaneous Revisions; Final Rule - Federal Register, Vol. 60, No. 219, page 57179, November 14, 1995. EPA made several changes to the transportation conformity rule. |
| August 29, 1995 | Transportation Conformity Rule Amendments: Miscellaneous Revisions; Proposed Rule - Federal Register, Vol. 60, No. 167, page 44790, August 29, 1995. EPA proposed to make several changes to the transportation conformity rule. |
| August 7, 1995 | Transportation Conformity Rule Amendments: Transition to the Control Strategy Period; Final Rule - Federal Register, Vol. 60, No. 151, page 40098, August 7, 1995. EPA permanently aligned the timing of certain consequences of State air quality planning failures under EPA's transportation conformity rule with the imposition of Clean Air Act highway sanctions. |
| February 8, 1995 | Transportation Conformity Rule Amendments: Transition to the Control Strategy Period; Interim Final Rule - Federal Register, Vol. 60, No. 26, page 7449, February 8, 1995. EPA aligned the timing of certain transportation conformity consequences with the imposition of Clean Air Act highway sanctions for a six-month period. |
| February 8, 1995 | Transportation Conformity Rule Amendments: Transition to the Control Strategy Period; Proposed Rule - Federal Register, Vol. 60, No. 26, page 7508, February 8, 1995. EPA proposed to permanently align the timing of certain transportation conformity consequences with the imposition of Clean Air Act highway sanctions. |
| November 24, 1993 | Air Quality: Transportation Plans, Programs, and Projects; Federal or State Implementation Plan Conformity; Final Rule - Federal Register, Vol. 58, No. 225, page 62188, November 24, 1993. EPA established the criteria and procedures for determining that transportation plans, programs, and projects which are funded or approved under title 23 U.S.C. or the Federal Transit Act conform with State or Federal air quality implementation plans. A PDF version of this notice of proposed rulemaking can be downloaded from the EPA website. |
| January 11, 1993 | Criteria and Procedures for Determining Conformity to Transportation Plans; Proposed Rule - Federal Register, Vol. 58, No. 6, page 3768, January 11, 1993. EPA proposed criteria and procedures for determining that transportation plans, programs, and projects which are funded or approved under title 23 U.S.C or the Federal Transit Act conform with State or Federal air quality implementation plans. A PDF version of this notice of proposed rulemaking can be downloaded from the EPA website at: https://www.epa.gov/sites/production/files/2016-06/documents/1993-conformity-proposedrule.pdf |
