Highlights
- The Fountain Hills AirNow monitoring station recorded ozone at 71.0 PPB at 1 a.m. on May 16, 2026.
- The reading crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
- The Maricopa County Air Quality Department operates the station; readers can track current conditions at AirNow's Phoenix-area page.
The EPA AirNow monitoring station in Fountain Hills recorded ozone at 71.0 parts per billion at 1 a.m. Saturday, May 16, according to the Maricopa County Air Quality Department, which operates the station under AQS site ID 040139704. That reading crossed AirNow's threshold designated as Unhealthy for Sensitive Groups for ozone.
The Maricopa County Air Quality Department is the reporting agency for the station. Residents seeking current forecasts, active advisories, or guidance for sensitive populations should consult the AirNow Phoenix-area page directly. The county also maintains an alert signup for High Pollution Advisories at its air quality portal.
Check the AirNow Phoenix page for updated hourly readings throughout the day.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040139704 retrieved 16/05/2026 02:51
- Maricopa County retrieved 16/05/2026 02:51
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 16/05/2026 02:51. Every claim traces to a source.
