Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Office of Planning, Environment, & Realty (HEP)
PlanningEnvironmentReal Estate

HEP Events Guidance Publications Awards Contacts

Policy and Guidance

Unlike the criteria pollutants, toxics do not have National Ambient Air Quality Standards (NAAQS) making evaluation of their impacts more subjective. Because there are no standards established for MSAT not a lot of policy and guidance documents are available. Note that the interim guidance document is not a substitute for any laws or regulations, thus do not impose legally binding requirements on EPA, DOT, states, or the regulated community.

Interim Guidance or PDF (203KB) - This FHWA interim guidance provides a tiered approach for analyzing MSAT in NEPA documents. Depending on the specific project circumstances, FHWA has identified three levels of analysis.

PDF files can be viewed with the Acrobat® Reader®

Updated: 04/10/2014
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000