Policy and Guidance

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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 nor the frequently asked questions document are not a substitute for any laws or regulations, thus do not impose legally binding requirements on EPA, DOT, states, or the regulated community.

Updated Interim Guidance on Mobile Source Air Toxic Analysis in NEPA Documents (also in PDF, 537KB) - October 2016 - 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. New: 10/27/2016
- Superseded: Interim Guidance or PDF (203KB, December 2012)
Frequently Asked Questions (FAQ) Conducting Quantitative MSAT Analysis for FHWA NEPA Documents (also in PDF, 156KB) - October 2016 - This FHWA technical assistance document provides information on how FHWA recommends that project sponsors can use MOVES for NEPA MSAT analysis including: a) defining the scope of MOVES work; b) gathering input data; and c) post-processing results. These are insights based on our experience in conducting quantitative MSAT analysis and questions received. New: 11/1/2016