Vehicles that emit excessive smoke are a contributor to poor air quality and smog in the Phoenix and Tucson areas. To promote clean air, Maricopa County operates a smoking vehicle notification program. This educational program is designed to improve air quality by increasing the understanding of the relationship between the quality of vehicle maintenance and air pollution.
To report vehicles you believe to be smoking excessively, please contact:
Maricopa County Air Quality Department - (602) 372-2703