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On March 29, 2006, FHWA and EPA issued "Transportation Conformity Guidance for Qualitative Hot-Spot Analysis in PM2.5 and PM10 Nonattainment and Maintenance Areas." Future qualitative PM2.5 and PM10 hot-spot analyses should be based on the March 29, 2006 guidance, which supersedes this 2001 guidance. However, any PM10 hot-spot analysis that was started prior to March 29, 2006 may be completed with this 2001 guidance.

Guidance for Qualitative Project Level "Hot Spot" Analysis in PM-10 Nonattainment and Maintenance Areas

Federal Highway Administration
Office of Natural Environment

September 2001

Table of Contents

Summary of Guidance
Questions and Answers
Figure 1--PM-10 Nonattainment and Maintenance Areas

Updated: 7/6/2011
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