Fri Apr 11 09:40:00 UTC 2025: ## Arizona Issues Ozone Pollution Advisory, Urges Residents to Limit Driving and Outdoor Activities

**PHOENIX, ARIZONA** — Maricopa County has issued a high ozone pollution advisory through Thursday, urging its millions of residents to take steps to reduce air pollution. Stagnant weather and increased emissions are creating unhealthy levels of ground-level ozone, posing significant risks to children, the elderly, and those with respiratory problems.

The Arizona Department of Environmental Quality (ADEQ) reports that ozone concentrations are expected to exceed federal health standards. The pollution is formed when emissions from vehicles, industrial processes, and other sources react with sunlight, a process exacerbated during spring and summer months.

To combat the unhealthy air quality, officials are encouraging residents to work from home, carpool, or utilize public transportation. They also advise against outdoor exercise during the day, delaying vehicle refueling until evening, and postponing projects using volatile organic compounds.

Air quality monitoring shows parts of Arizona reaching “very unhealthy” levels, according to the AirNow interactive map. While Phoenix ozone levels are currently in the moderate range, the situation is expected to worsen before improving over the weekend with the arrival of a low-pressure system. However, this system may also bring stronger winds, potentially increasing airborne dust. A similar air quality alert has been issued in Houston, Texas.

The ADEQ has implemented additional measures, including a ban on wood burning in outdoor fireplaces and fire pits, and a prohibition on government workers using leaf blowers. Maricopa County officials stress that all residents are at risk from ground-level ozone, which can harm lungs and trigger asthma, with children facing the highest risk due to their developing respiratory systems. Residents are urged to monitor air quality forecasts and follow ADEQ guidelines.

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