Highlights
- The Fountain Hills AirNow monitoring station recorded ozone at 75.0 PPB at 10 p.m. on May 9, 2026.
- The reading crossed AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone.
- The reading is reported by the Maricopa County Air Quality Department via the EPA AirNow network.
- Residents can check current conditions and active alerts at AirNow's Phoenix-area page.
The Maricopa County Air Quality Department recorded an ozone concentration of 75.0 parts per billion at the Fountain Hills monitoring station (AQS site 040139704) at 10 p.m. Friday, May 9, 2026, crossing the EPA AirNow threshold designated as unhealthy for sensitive groups.
The reading was reported through the EPA AirNow public hourly aggregate network. Maricopa County Air Quality Department is the reporting agency for the station.
Residents can track current readings and any active advisories for the Phoenix area at AirNow's Phoenix-area page. For health guidance related to air quality conditions, Maricopa County Air Quality Department is the authoritative local source.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040139704 retrieved 09/05/2026 23:40
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 09/05/2026 23:40. Every claim traces to a source.
