Regional Emissions Analysis

Associated Guidance:

• Court Decision on Transportation Conformity Rule, October 20, 2006 New 10/26/06
• Interim Guidance for Implementing the Transportation Conformity Provisions in SAFETEA-LU

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.

Associated Research:

• Regional Emissions Analysis in Small Urban and Rural Areas (or PDF - 405 KB)
  This study documents and assesses 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 highlights strengths and weaknesses of each.

• 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.