With the Tucson area’s population approaching 1 million, maintaining healthy air, understanding the sources of pollution and initiating steps to curb pollution are important.
Currently, air quality in the Tucson region is good and meets all of the federal environmental health standards. However, several air pollutants (ground-level ozone, particulate matter, carbon monoxide) are of key significance in our area. Of these three, ground-level ozone is of the greatest concern since increasing levels may exceed the total concentrations recommended by the federal health standard.
Although air pollutants are emitted from commercial and industrial sources, the majority of air pollution in the county comes from motor vehicle use.