Highlights
- The Fountain Hills air quality station recorded ozone at 78.0 parts per billion at 10 p.m. on June 20.
- That reading crossed AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone, per EPA AirNow data.
- The Maricopa County Air Quality Department operates the station; current forecasts and active alerts are available at AirNow's Phoenix-area page.
The Maricopa County Air Quality Department's monitoring station in Fountain Hills recorded ozone at 78.0 parts per billion at 10 p.m. on June 20, crossing AirNow's threshold for the Unhealthy for Sensitive Groups category.
The reading comes from AQS site ID 040139704, one of the county's fixed air quality monitors, as reported through the EPA AirNow public hourly aggregate feed.
For current forecasts and any active advisories covering the Phoenix area, including Fountain Hills, the AirNow Phoenix page is the authoritative source. Health guidance for sensitive groups should be sought from the Maricopa County Air Quality Department.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040139704 retrieved 20/06/2026 23:56
- Maricopa County retrieved 20/06/2026 23:56
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 20/06/2026 23:56. Every claim traces to a source.
