Project Development - Air Quality

Project Level Transportation Conformity

Air Quality Conformity Regulations
These federal regulations cover the legal consultation and methodology requirements on air quality conformity, and the criteria/procedures for violations. Only applicable in Nonattainment Areas.

PM Hot-spot Analyses: Frequently Asked Questions
This Environmental Protection Agency (EPA) document describes the type of projects that need a quantitative PM hot-spot analysis. Please contact Environmental Planning Air Quality staff for interagency consultation requirements. 

2017 Carbon Monoxide Categorical Hot-Spot Finding
This Federal Highway Administration  (FHWA) Carbon Monoxide (CO) categorical hot-spot finding  guidance describes projects that can proceed without a quantitative CO Hot-Spot Analysis.  Please contact Environmental Planning Air Quality staff for information on the appropriate level of CO analysis for projects in CO nonattainment areas.

Project Exemption List
This list consist of projects that are exempt from conformity to transportation plans and TIPs.

Transportation Conformity: A Basic Guide for State and Local Officials, FHWA Guidance FHWA-HEP-17-034

Quick Reference Guide For Transportation Planners/Engineers: Generating Traffic & Activity Data for Project-Level Air Quality Analyses 
This quick reference guide is intended to assist traffic analysts who work with traffic data and models in providing the traffic data required for emissions modeling and air quality analysis for transportation projects. It is intended as a supplement to National Cooperative Highway Research Program (NCHRP) Report 765, Analytical Travel Forecasting Approaches for Project-Level Planning and Design.

NEPA Air Quality

Mobile Source Air Toxics Guidance
This guidance helps the practitioner evaluate the mobile source air toxics on ADOT's highway improvement projects.

FHWA Green House Gas (GHG) Resource
This Federal Highway Administration website provides guidance on how to address Climate Change in NEPA documents.

Addressing Air Quality Issues in the NEPA Process for Highway Projects
This handbook was developed by the American Association of State Highway and Transportation Officials (AASHTO) to assist practitioners in addressing air quality issues in the NEPA process required under the clean air act. Please use this as a guide for developing the necessary NEPA air quality reports for ADOT projects.