On this page:

• Accelerated Retirement of Vehicles
• Airports
• Commuter Programs
• Idling
• Intelligent Transportation Systems Management
• Land Use
• Diesel Retrofit and Replacements
• Transportation Control Measures
• Transportation Pricing
• Guidance

Accelerated Retirement of Vehicles

• Guidance for the Implementation of Accelerated Retirement of Vehicles Programs (PDF) (29 pp, 69 K, EPA420-R-93-018, February 1993)
  Guidance that illustrates a methodology for calculating benefits and an administrative framework targeting vehicles that have been identified as high emitters.

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Airports

• Guidance on Airport Emissions and Emission Reductions
  These documents and links provide guidance for establishing strategies to reduce airport emissions, including emissions from airport ground support equipment (GSE) and ground access vehicles. These documents were developed for regional, state, and local agencies, airports, airlines, and other organizations that want to reduce airport pollution.
  • Guidance on Airport Emission Reductions Credits for Early Measures through Voluntary Airport Low Emission Programs (PDF) (45 pp, 312 K)
    Joint guidance issued by EPA and the Federal Aviation Administration (FAA) outlining the process for crediting voluntary airport emission reductions in a State Implementation Plan (SIP). 
  • Emissions and Dispersion Modeling System (EDMS)
    An FAA air quality assessment tool designed to assess the air quality impacts of airport emission sources, including aircraft, GSE, ground access vehicles, and other sources.
  • Technical Support for the Development of Airport Ground Support Equipment Reductions (PDF) (144 pp, 734 K, EPA420-R-99-007, May 1999)
    A study that discusses program design and the potential for achieving emission reductions from GSE.
  • Airport GSE Model (XLS)(2 pp, 504 K)  Free Viewers
    A spreadsheet tool that provides users with a quick analysis of the emission benefits and cost-effectiveness of controlling GSE emissions.
  • Airport GSE Model Directions 
    Directions for operating the Airport GSE Model.

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Commuter Programs

• Guidance on Emissions and Emission Reductions from Commuter Programs
  The document below provides guidance for crediting emission reductions from commuter programs when the program successfully reduces pollution from vehicle sources.
  • Commuter Programs: Quantifying and Using Their Emission Benefits in SIPs and Conformity (PDF) (13 pp, 498 K, EPA-420-B-14-004, February 2014, supersedes EPA-420-B-07-015, October 2007)
    Guidance describing how to credit commuter benefit programs in a SIP or transportation conformity determination.

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Idling 

• Locomotive Idling Guidance (PDF) (24 pp, 312 K, EPA-420-B-09-037, October 2009)
  Guidance for quantifying and using long duration switch yard locomotive idling emission control programs in State Implementation Plans and conformity. Update of June 2013:  
  • The default locomotive emission factors included in this guidance have since been updated; consult the locomotives page for the most recent emission factors.
  • In addition, Appendix I to EPA's Transportation Conformity Guidance for Quantitative Hot-spot Analyses in PM_2.5; and PM₁₀ Nonattainment and Maintenance Areas describes how to estimate locomotive emissions at the project level and may be a useful resource when quantifying locomotive emission reductions.

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Intelligent Transportation Systems Management

• Assessing the Emissions and Fuel Consumption Impacts of Intelligent Transportation Systems (ITS) (PDF) (70 pp, 506 K, EPA-231-R-98-007, December 1998)
  This study describes the types of modeling approaches needed to capture the short- and long-term transportation, emissions, and fuel consumption impacts of ITS deployment.

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Land Use

• Background Information for Land Use SIP Policy (PDF) (66 pp, 736 K, EPA420-R-98-012, September 1998) 
  This report summarizes efforts by states to take SIP credit for land use strategies and areas where additional policies are needed to support effective land use SIP policies.
• Comparing Methodologies to Assess Transportation and Air Quality Impacts of Brownfields and Infill Development (PDF) (49 pp, 1.4 MB, EPA-231-R-01-001, August 2001)
  This report describes and compares four methods for characterizing the air quality benefits resulting from infill development. This report is a companion piece to EPA's policy guidance entitled, "Improving Air Quality Through Land Use Activities."
• Evaluation of Modeling Tools for Assessing Land Use Policies and Strategies (PDF) (60 pp, 244 K, EPA420-R-97-007, August 1997)
  This EPA-sponsored report addresses the relationship between land use, mobility, and vehicle miles traveled; provides an assessment of various travel demand and land use modeling tools.
• Granting Air Quality Credit for Land Use Measures: Policy Options (PDF) (56 pp, 180 K, EPA420-P-99-028, September 1999)
  This study analyzes policy options for recognizing and providing credit for sustainable land use activities when specific control measures are employed.
• Improving Air Quality Through Land Use Activities (PDF) (110 pp, 1.8 MB, EPA420-R-01-001, January 2001)
  Guidance to assist air quality and transportation planners in accounting for the air quality impacts of voluntary land use policies and projects.

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Diesel Retrofit and Replacements

• Diesel Retrofit and Replacement Projects: Quantifying and Using Their Emission Benefits in SIPs and Conformity - Guidance for State and Local Air and Transportation Agencies (PDF) (65 pp, 1.0 MB, EPA-420-B-18-017, March 2018)
  This document provides guidance on quantifying and using emission reductions from highway and nonroad diesel vehicles, engines, and equipment that have been retrofitted or replaced with cleaner technologies. The guidance discusses how emission reductions from diesel retrofit and replacement projects can be used in a SIP and in transportation conformity and general conformity determinations, based on the new MOVES2014a methodology described in this guidance.
  • Nonroad Retrofit Tool (XLTM) (14 MB, July 2018): This spreadsheet-based tool simplifies the creation of a nonroad retrofit and replacement input table by creating a template for that table and then filling that table based on user input. Instructions are included with the tool.

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Transportation Control Measures

• EPA’s Travel Efficiency Assessment Method (TEAM): Development and Case Studies
  This presentation was given in an October 20, 2016 webinar describing EPA’s recent case studies examining the potential for travel efficiency strategies (such as transit, road and parking pricing, land use changes, bike and pedestrian infrastructure) to reduce emissions of criteria pollutants and greenhouse gases. During this webinar, EPA and its partner agencies in the Atlanta, Orlando and St. Louis case studies provided an overview of the TEAM analytical process, the travel efficiency strategies each agency considered, and their potential emission reductions.
• Assessing Regional Emissions Reductions from Travel Efficiency: Applying the Travel Efficiency Assessment Method
  This presentation was given at the 2016 TRB Summer Conference on Transportation and Air Quality in Minneapolis, MN. It summarizes the application of the Travel Efficiency Assessment Method (TEAM) to analyze selected transportation emission reduction strategies in three case studies EPA conducted in partnership with Atlanta, Orlando, and St. Louis.
• Applying TEAM in Regional Sketch Planning: Three Case Studies in Atlanta, Orlando, St. Louis (PDF) (81 pp, 946 K, EPA-420-R-16-009, July 2016)

  This report documents 3 case studies of the application of TEAM (Travel Efficiency Assessment Method) to estimate the travel activity and emissions impacts of potential travel efficiency scenarios. EPA partnered with Metropolitan Planning Organizations in Atlanta, Orlando and St. Louis to apply the TEAM approach. TEAM uses a transportation sketch model, regionally derived travel activity data and EPA’s MOVES emissions model to estimate potential emission reductions from combinations of travel efficiency strategies. The case studies provide a useful planning resource for modeling and estimating greenhouse gas and criteria air pollutant emission reductions resulting from travel efficiency strategies.

  Contact: Mark Simons, phone: (734) 214-4420, email: simons.mark@epa.gov

• Estimating Emission Reductions from Travel Efficiency Strategies: Three Sketch Modeling Case Studies (PDF) (76 pp, 2.5 MB, EPA-420-R-14-003a, June 2014)
  This report documents 3 case studies of the application of TEAM (Travel Efficiency Assessment Method) to assess the potential regional emission reductions from travel efficiency strategies. TEAM is an analytical approach that uses local travel activity information, sketch-planning travel activity analysis, and MOVES emissions modeling to estimate potential emission reductions from combinations of travel efficiency strategies. The case studies offered an opportunity for EPA to provide technical support to 3 areas interested in exploring tools to assess travel efficiency strategies, to demonstrate the capabilities of the TEAM approach, and to evaluate its usefulness at the regional scale. The resulting report documents the process, modeling and analyses performed in partnership with regional planners from Boston, Kansas City and Tucson. 
  Contact: Mark Simons, email: simons.mark@epa.gov, phone: 734-214-4420.
• Analyzing Emission Reductions From Travel Efficiency Strategies: A Guide to The TEAM Approach (PDF) (46 pp, 2 MB, EPA-420-R-11-025, December 2011)
  This document provides information and guidance for using the Travel Efficiency Assessment Method (TEAM) approach for assessing the potential of travel efficiency strategies for reducing criteria and greenhouse gas emissions. The guide supports a preliminary evaluation of emission reductions for several travel efficiency strategies and combinations of strategies. TEAM uses regionally derived travel model data and other travel activity information, sketch-planning analysis and EPA’s Motor Vehicle Emissions Simulator (MOVES) to estimate emission reductions. 
  Contact: Mark Simons, email: simons.mark@epa.gov, phone: 734-214-4420.
• Potential Changes in Emissions Due To Improvements In Travel Efficiency (PDF) (84 pp, 2.5 MB, EPA-420-R-11-003, March 2011)
  This report provides information on the effectiveness of travel efficiency measures for reducing criteria and greenhouse gas emissions at the national scale. The report describes an approach that uses regionally derived travel model data and other travel activity information, and sketch-planning analysis to estimate potential emission reductions from urban areas of varying size and characteristics. The results are applied to other urban areas in the U.S. of similar characteristic to estimate national emission reductions.
  • Potential Changes in Emissions Due To Improvements in Travel Efficiency - Supplemental Report: Analysis of Potential Co-Benefits (PDF) (21 pp, 1.7 MB, EPA-420-R-11-014, November 2011)
    In this supplemental report, several co-benefits resulting from the implementation of the travel efficiency strategies or combinations of strategies (referred to as scenarios) analyzed in the March 2011 primary report are evaluated. The co-benefits from implementation of these scenarios include a reduction in health impacts associated with air pollution, reduced traffic congestion, reduced user operating costs, improved energy security, and reduction in traffic accidents. 
    Contact: Mark Simons, email: simons.mark@epa.gov, phone: 734-214-4420.
• Transportation Control Measures: An Information Document for Developing and Implementing Emission Reduction Programs (PDF) (42 pp, 6.6 MB, EPA-430-R-09-040, March 2011)
  This document provides information on transportation control measures that have been implemented across the country for a variety of purposes, including reducing criteria pollutants and greenhouse gases. The document describes the processes used to develop and implement the strategies and, where available, their effectiveness.
  Contact: Mark Simons, email: simons.mark@epa.gov, phone: 734-214-4420.
• Benefits Estimates for Selected Transportation Control Measure (TCM) Programs (PDF) (95 pp, 677 K, EPA420-R-98-002, March 1999)
  This report quantifies TCMs that have been implemented, and outlines the methodologies used for estimating their emission and travel activity effects.
• Methodologies for Estimating Emission and Travel Activity Effects of TCMs (PDF) (146 pp, 3.49 MB, EPA420-R-94-002, July 1994)
  This is an overview of several different methodologies available for assessing the potential emission reductions associated with transportation control measures.
• Transportation Control Measure: State Implementation Plan Guidance 
  This document lists approval criteria that needs to be met so that a transportation control measure (TCM) may be incorporated into a SIP. The guidance also directs states to use additional TCM-specific guidance where available.
• Index of Transportation Measure Quantification Efforts: Methodology Matrix 
  This is a list of summaries of a broad range of studies that have been conducted to evaluate the effectiveness of transportation control measures.
• Transportation Control Measure Information Documents (PDF) (34 pp, 2.06 MB, EPA400-R-92-006, March 1992)
  This report describes variations in implementation, examples, expected transportation and emission impacts, and other important considerations for the 16 broad categories of TCMs as required and described under Section 108(f) of the Clean Air Act. 

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Transportation Pricing

• Opportunities to Improve Air Quality through Transportation Pricing Programs 
  This document provides general information on pricing programs, including pricing program advantages, the institutional relationships necessary for pricing measures to work, and some pitfalls to avoid in implementing a program.
• Technical Methods for Analyzing Pricing Measures to Reduce Transportation Emissions (PDF) (257 pp, 1.8 MB, EPA 231-R-98-006, August 1998)
  This report, jointly funded by EPA and DOT, provides technical assistance on best practice approaches for analyzing various transportation pricing policies.

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Guidance 

Guidance on Fulfilling Clean Air Act Section 182(d)(1)(A) Requirements (PDF) (7 pp, 830 K, 420-B-12-053, August 2012)