Skip to content
Facebook iconYouTube iconTwitter iconFlickr iconLinkedInInstagram
Office of Planning, Environment, & Realty (HEP)
HEP Events Guidance Publications Glossary Awards Contacts

Updated Interim Guidance on Mobile Source Air Toxic (MSAT) Analysis in National Environmental Policy Act (NEPA) Documents

This FHWA interim guidance Memorandum provides a tiered approach for analyzing MSAT in NEPA documents. Depending on the specific project circumstances, FHWA has identified three levels of analysis: Projects with No Meaningful Potential MSAT Effects, or Exempt Projects, Projects with Low Potential MSAT Effects, and Projects with Higher Potential MSAT Effects.  The Memorandum includes appendices to use for prototype language, incomplete and unavailable information, research, and mitigation resources. The MSAT Frequently Asked Questions document provides technical assistance information on how FHWA recommends that project sponsors can use MOVES for NEPA MSAT analysis.

Updated: 01/30/2023
Updated: 1/30/2023
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000