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Transportation - Air Quality


Air Quality Conformity Analysis of the 2015 CLRP Amendment and the FY2015-2020 TIP for the Washington Metropolitan Region
Publication Date: 10/21/2015
Publication Number: 20156516

This report documents an updated analysis of the 2015 Constrained Long Range Plan Amendment (CLRP) with respect to air quality conformity requirements under the 1990 Clean Air Act Amendments. The analysis used criteria and procedures contained in the Environmental Protection Agency (EPA)'s final conformity rule, published in the November 24, 1993 Federal Register, with subsequent amendments and additional federal guidance published by the Environmental Protection Agency (EPA) and by the Federal Highway Administration (FHWA) and the Federal Transit Administration (FTA). The analysis is a responsibility of the National Capital Region Transportation Planning Board (TPB).

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  • Air Quality Conformity Analysis of the 2015 CLRP Amendment and the FY2015-2020 TIP for the Washington Metropolitan Region



  • Air Quality Conformity Determination of the 2014 CLRP and FY 2015-2020 TIP for the Washington Metropolitan Region
    Publication Date: 10/15/2014
    Publication Number: 20146442

    This report documents the assessment of the
    2014 Constrained Long Range Plan (CLRP) and
    the FY 2015-2020 Transportation Improvement
    Program (TIP) with respect to air quality
    conformity requirements under the 1990 Clean
    Air Act Amendments. The assessment used
    criteria and procedures contained in the
    Environmental Protection Agency (EPA)'s final
    conformity rule, published in the November 24,
    1993 Federal Register, with subsequent
    amendments and additional federal guidance
    published by the Environmental Protection
    Agency (EPA) and by the Federal Highway
    Administration (FHWA) and the Federal Transit
    Administration (FTA). The assessment is a
    responsibility of the National Capital Region
    Transportation Planning Board (TPB).

    Free File Download
  • Full Report with Appendices (10 MB)



  • Air Quality Conformity Determination of the 2013 CLRP and FY 2013-2018 TIP for the Washington Metropolitan Region
    Publication Date: 7/17/2013
    Publication Number: 20136442

    This report documents the assessment of the
    2013 Constrained Long Range Plan (CLRP) and
    the FY 2013-2018 Transportation Improvement
    Program (TIP) with respect to air quality
    conformity requirements under the 1990 Clean
    Air Act Amendments. The assessment used
    criteria and procedures contained in the
    Environmental Protection Agency (EPA)'s final
    conformity rule, published in the November 24,
    1993 Federal Register, with subsequent
    amendments and additional federal guidance
    published by the Environmental Protection
    Agency (EPA) and by the Federal Highway
    Administration (FHWA) and the Federal Transit
    Administration (FTA). The assessment is a
    responsibility of the National Capital Region
    Transportation Planning Board (TPB).

    Free File Download
  • Short Report with Comments
  • Full Report with Appendices (8.7 MB)



  • Air Quality Conformity Determination of the 2012 CLRP and FY 2013-2018 TIP for the Washington Metropolitan Region
    Publication Date: 7/18/2012
    Publication Number: 20126442



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  • 2012 CLRP Conformity Update - March 20, 2013 (7.8 MB)
  • 2012 CLRP Conformity Update - December 19, 2012 (10 MB)
  • Full Report with Appendices (9.4 MB)



  • Air Quality Conformity Determination of the 2011 Constrained Long Range Plan for the Washington Metropolitan Region
    Publication Date: 11/16/2011
    Publication Number: 20116424



    Free File Download
  • Full Report with Appendicies (13.7 MB)



  • Air Quality Conformity Determination of the 2010 Constrained Long Range Plan and the FY 2011-2016 Transportation Improvement Program for the Washington Metropolitan Region
    Publication Date: 11/17/2010
    Publication Number: 20106395



    Free File Download
  • Full Report with Appendicies (10.5 MB)
  • Appendix A - Air Quality Conformity Scope of Work
  • Appendix B - List of Project Inputs (1.9 MB)
  • Appendix C - Interagency and Public Involvement Process (1.6 MB)
  • Appendix D - Documentation of Emission Factor Development (4.3 MB)
  • Appendix E - Documentation of Mobile Source Emission Calculations (post-processor)
  • Appendix F - Vehicle-related Emissions Calculations
  • Appendix G - Auto Access Emissions Calculations
  • Appendix H - Bus Emissions Estimation
  • Appendix I - TERMs Implementation reports



  • Fine Particles (PM 2.5) Standards Air Quality Conformity Assessment
    Publication Date: 12/21/2005
    Publication Number: 20056257

    This report documents the results of the fine particles (PM2.5) standards air quality conformity assessment of the 2005 Constrained Long Range Plan (CLRP) and the FY2006-2011 Transportation Improvement Program (TIP). This supplements the technical report, Air Quality Conformity Determination Of The 2005 Constrained Long Range Plan And The FY2006-2011 Transportation Improvement Program For The Washington Metropolitan Region (October 19, 2005), which addressed carbon monoxide and the 8-hour ozone standard.

    Free File Download
  • Fine Particles (PM 2.5) Standards Air Quality Conformity Assessment (10 MB)



  • Transportation Planning Board Consultation Procedures
    Publication Date: 5/20/1998
    Publication Number: 19986233

    This report presents the consultation procedures which the TPB will follow in assessing conformity of its plans and programs. These procedures will also provide the basis for the state air agencies to make the required revisions to their state implementation plans.

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  • TPB Consultation Procedures with Respect to Transportation Conformity Regulations Governing TPB Plans and Programs (2 MB)



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