Air quality discussions address the emissions of pollutants from transportation systems which can be harmful to human beings, the natural environment, and the integrity of man-made materials. The Colorado Department of Transportation (CDOT) conducts air quality evaluations for its projects. The CDOT Environmental Programs Branch (EPB) or Regional Air Quality Specialist evaluates the potential for air quality impacts from a proposed transportation project and then determines if coordination with the Colorado Department of Public Health and the Environment Air Pollution Control Division.