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Ozone prompts 2nd air-quality warning in a week for Tucson

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Ozone prompts 2nd air-quality warning in a week for Tucson

  • A hot, hazy day in August 2020
    Pima CountyA hot, hazy day in August 2020

Air pollution in the Tucson metro area hit harmful levels on Wednesday, prompting an advisory from the Pima County Department of Environmental Quality that residents should avoid intense physical outdoor activity. The air-quality announcement is the second this week. 

Forecasts for Tucson include high levels of ground-level ozone on Friday as well, meaning another warning may follow.

“Individuals who are especially sensitive to air pollution may experience shortness of breath, coughing, throat irritation, wheezing and breathing discomfort,” county officials said.

The advisory suggests limiting levels of exertion outside between noon and 6 p.m., especially for anyone sensitive to air pollution.

PDEQ issued the advisory because the county agency detected high amounts of ground-level ozone in the Tucson metro area’s air. Ground-level ozone commonly comes from car exhaust, industrial and power plant emissions and volatile organic compounds, or hydrocarbons, that react with heat and sunlight, PDEQ said.

People who might be sensitive to ozone include children, adults who are active outdoors, people with respiratory diseases and certain individuals who have an unusual sensitivity to this particular pollutant, PDEQ said. Anyone feeling symptoms should seek medical attention, the advisory warns.

According to the advisory, intense physical outdoor activity also allows ozone to penetrate into part of the lungs more likely to be injured.

PDEQ recommended the following actions to reduce adding to ground-level air pollution:

  • Reduced driving and combining errands.
  • Avoid leaving the engine running.
  • Refuel cars after 6 p.m. when vapors are less likely to form air-pollutants like ozone.
  • Always stop at the click when refueling.
  • Avoid using gas-powered lawn and gardening equipment.
  • Check tire pressure monthly to reduce gas use.
  • Conserve electricity to reduce emissions from power plants.

Bennito L. Kelty is’s IDEA reporter, focusing on Inclusion, Diversity, Equity and Access stories, and a Report for America corps member supported by readers like you.

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