Source: Pima County, July 9, 2021
Pima County Department of Environmental Quality is issuing a High Pollution Advisory
for ground-level ozone air pollution for the Tucson metropolitan area. Individuals who are especially sensitive to air pollution may experience shortness of breath, coughing, throat irritation, wheezing and breathing discomfort. It is possible that ozone levels may be elevated this weekend, if weather conditions are similar.
If you are especially sensitive to ozone, you may want to limit your level of exertion outside between noon and 6 p.m. when elevated levels of ozone pollution are more likely to occur. Intense physical outdoor activity causes faster and deeper breathing, which allows ozone to penetrate into the parts of the lungs that are more likely to be injured.
Those who are most likely to be sensitive to ozone include children, people with respiratory disease, adults who are active outdoors, and certain individuals who have an unusual sensitivity to this particular pollutant.
There are many types of emissions that contribute to the creation of ground-level ozone. Motor vehicle exhaust, industrial and power plant emissions, gasoline vapors, chemical solvents, as well as natural sources, emit oxides of nitrogen and volatile organic compounds that form ozone in the presence of intense sunlight and heat.
Actions to reduce the production of ground level ozone: