Emissions Modeling

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Microscale and Regional Modeling and Emission Models

EPA's MOBILE6 Vehicle Emission Modeling Software

EPA's MOVES (Motor Vehicle Emission Simulator) Website

Associated Guidance:

• Transportation Conformity Guidance for Qualitative Hot-Spot Analyses in PM_2.5 and PM₁₀ Nonattainment and Maintenance Areas - March 2006
• Guidance for Qualitative Project Level "Hot-Spot" Analysis in PM₁₀ Nonattainment and Maintenance Areas - September 12, 2001

Associated EPA Guidance:

• Guidance for Creating Annual On-Road Mobile Source Emission Inventories for PM_2.5 Nonattainment Areas for Use in SIPs and Conformity. A PDF copy of this guidance can be downloaded from the EPA website.
• Official Release of the MOBILE6.2 Motor Vehicle Emissions Factor Model and the December 2003 AP-42 Methods for Re-Entrained Road Dust
• Official Release of the MOBILE6 Motor Vehicle Emissions Factor Model
• Official Release of EMFAC2007 Motor Vehicle Emissions Factor Model for Use in the State of California
• Policy Guidance on the Use of MOBILE6 for SIP Development and Transportation Conformity
• Technical Guidance on the Use of MOBILE6 for Emission Inventory Preparation
• Policy Guidance on Use of November 2006 Update to AP-42 for Re-entrained Road Dust for SIP Development and Transportation Conformity

Associated Research:

• Implications of the Implementation of the MOBILE6 Emissions Factor Model on Project-Level Impact Analyses Using the CAL3QHC Dispersion Model August 2004. (PDF 1.9 MB)
  Prepared by ICF Consulting for the Federal Highway Administration, this report discusses how the revisions to the MOBILE model affect the estimation of localized CO concentrations, including problems and difficulties in the interaction of MOBILE6 with CAL3QHC, and recommendations for addressing these issues. In addition, this report discusses how the implementation of MOBILE6 impacts screening assessment procedures.

• MOBILE6 Implementation Experience
  The FHWA, in conjunction with the Association of Metropolitan Planning Organizations (AMPO) Air Quality Subcommittee, worked with a group of MPOs to document their experience in applying MOBILE6 in the conformity process. The purpose of this study is to provide an understanding of what steps these organizations took to prepare for use of the new MOBILE model and to identify potential training and technical assistance needs. Specifically, this study documents how MPOs are implementing MOBILE6, what data is being collected locally, how data is being collected, and identifies implementation issues that arose during the transition to MOBILE6. FHWA and AMPO intend to share this information with other MPOs and practitioners who can learn from the experiences of the MPOs that participated in this effort.

• Multi-Pollutant Emissions Benefits of Transportation Strategies-FHWA (PDF 1.3 MB) November 2006.
  Prepared by ICF Consulting for the Federal Highway Administration, this report provides a compendium of traditional and innovative transportation-related control strategies. The report identifies the emissions effects of the strategies on CO, PM10, PM2.5, NOx, VOCs, Sox, and NH3.

• Regional Emissions Analysis in Small Urban and Rural Areas (PDF 405 KB)
  This study documents and assesses methodologies tha
  The purpose of this project is to document and assess methodologies that can be used for estimating regional emissions for conformity analyses in small urban or rural areas. The report provides transportation practitioners a menu of methodologies and techniques for small urban or rural areas to consider for regional emissions analysis. The report also includes an assessment of these methodologies/techniques, and highlight strengths and weaknesses of each.