Highlights
- The Fountain Hills air quality monitor recorded ozone at 74.0 PPB at 10 p.m. Thursday, Aug. 20.
- That reading crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency; current conditions are tracked at AirNow's Phoenix-area page.
The Maricopa County Air Quality Department monitoring station in Fountain Hills recorded ozone at 74.0 parts per billion at 10 p.m. Thursday, Aug. 20, crossing AirNow's Unhealthy for Sensitive Groups breakpoint for ozone, according to the EPA AirNow hourly aggregate for AQS site 040139704.
The reading was logged at the 22:00 local hour. Sensitive groups, which the Arizona Department of Environmental Quality identifies as including children, older adults, people with heart or lung disease, and those with asthma or bronchitis, face elevated risk when ozone reaches this threshold.
The town of Fountain Hills directs residents to Maricopa County Air Quality for regulatory guidance; the department's main line is 602-506-6010. Updated readings and any active advisories for the Phoenix area are available at AirNow.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040139704 retrieved 20/08/2026 23:55
- azdeq.gov retrieved 20/08/2026 23:55
- fountainhillsaz.gov retrieved 20/08/2026 23:55
Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 20/08/2026 23:55. Every claim traces to a source.
