Reference Material

The following are reference materials developed by FHWA and others to help practitioners in the implementation of FHWA's air quality programs.

2008 8-hour Ozone Nonattainment Area Maps - Maps of each area designated nonattainment area for the 2008 8-hour ozone standard
2006 Particulate Matter (PM2.5) Nonattainment Area Maps - Maps of each area designated nonattainment areas for the 1997 particulate matter standard.
1997 8-hour Ozone Nonattainment Area Maps - Maps of each area designated nonattainment area for the 1997 8-hour ozone standard
1997 Particulate Matter (PM2.5) Nonattainment Area Maps - Maps of each area designated nonattainment areas for the 1997 particulate matter standard.
Air Quality Planning for Transportation Officials - The purpose of this guide is to provide an overview of the air quality planning requirements of the Clean Air Act (CAA) that are transportation-related.
Air Quality Trends - EPA's status of air quality and air pollutant emissions
EPA's Greenbook - Listing of area in the country that are currently designated as nonattainment or maintenance for the criteria pollutants
Transportation Air Quality: Selected Facts and Figures (2006, FHWA) - This updated brochure provides an overview of recent transportation and air quality trends from across the Nation. Information regarding new federal tailpipe control standards, new air quality standards, recent travel and congestion rates by city, sources of greenhouse gas emissions, transportation policy strategies, and other useful sources of air quality-related information are provided. The resource section of this brochure provides a useful listing of relevant web sites that can link you to up-to-date transportation and air quality reports and information.