Transportation Conformity: A Basic Guide for State and Local Officials

Revised April 2005
This guide was originally published in 1997 and was last updated in 2000.

Table of Contents

• Executive Summary
• Introduction
• Transportation Conformity and Actions Subject to Conformity
• Pollutants that Come from On-road Vehicles (e.g., cars, trucks, buses)
• Description of a Conformity Determination
• Responsibility for Making a Conformity Determination
• Frequency Requirements for Transportation Conformity
• Conformity in New 8-Hour Ozone and PM-2.5 Areas
• Key Elements of a Conformity Determination
• Interagency Consultation and Public Involvement
• Public Involvement
• Latest Planning Assumptions and Emissions Model
• Regional Emissions Analysis
• Motor Vehicle Emission Budget
• Timely Implementation of TCMs
• Fiscal Constraint
• Project Level Conformity and Hot-spot Analysis
• Conformity Lapse
• Options to Resolve a Conformity Lapse
• Options for MPOs to Reduce Emissions
• Appendix A: Health Effects of Pollutants
• Appendix B: Options to Reduce Emissions from On-Road Motor Vehicles
• Appendix C: Reource Agencies and Other Helpful Contacts
• Glossary