The ultimate goal of the Pima County air quality control program is to reduce the concentration of harmful air contaminants in ambient air to safe and healthy levels, and to maintain those levels. A key process in controlling air pollution is to define the nature and extent of air quality problems within a geographical area through monitoring. Ambient air monitoring in Pima County has been conducted by the Pima County Department of Environmental Quality (PDEQ) and its predecessors since the 1960's. Over time, various air pollution monitoring and research programs have been established and revised to meet changing federal regulations and local needs.
Currently, the Pima County monitoring section monitors for six criteria pollutants in the Tucson area and Green Valley. Pima County DEQ monitors in accordance to the regulations established by the Environmental Protection Agency (EPA) and reports this data to this web page hourly as well as the EPA's Air Now website and various other agencies. An Air Index Now report that is based on the Air Quality Index (AQI) is generated hourly for public notification of current air quality conditions and how it may affect them. Below are the current values.
If you cannot see the Air Index Now in the box below, the internet browser you are using may need to be updated.
Besides the tabs below the Information, Education, Public Outreach
and the Clean Air Program
area will have additional information about air quality. As part of its role in the community, PDEQ offers educational, regulatory and professional group tours of its air quality monitoring facilities. Our highly trained staff can explain various aspects of air quality monitoring. Many schools, including the University of Arizona, utilize these tours in their curriculum. Please call our Community Outreach Contact, at (520) 724-7400 if you would like more information on this service.