Highlights
- The Fountain Hills air quality station recorded ozone at 72.0 PPB at 9 p.m. on May 22, 2026.
- The reading crossed AirNow's threshold for the Unhealthy for Sensitive Groups category.
- 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 recorded an ozone concentration of 72.0 parts per billion at the Fountain Hills monitoring station (AQS site ID 040139704) at 9 p.m. Thursday, May 22, according to EPA AirNow hourly data. The reading crossed AirNow's threshold for the Unhealthy for Sensitive Groups classification for ozone.
Current conditions and any active advisories for the Phoenix area are available at AirNow's Phoenix page. For health guidance specific to this reading, the Maricopa County Air Quality Department is the responsible agency.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040139704 retrieved 22/05/2026 22:54
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 22/05/2026 22:54. Every claim traces to a source.
