Highlights
- The Fountain Hills air monitoring station recorded ozone at 77.0 PPB at 11 p.m. on May 15, 2026.
- The reading crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency for the station, AQS site ID 040139704.
- Residents can check current forecasts and active alerts at AirNow's Phoenix-area page.
The Maricopa County Air Quality Department's Fountain Hills monitoring station recorded ozone at 77.0 parts per billion at 11 p.m. Thursday, May 15, crossing AirNow's Unhealthy for Sensitive Groups threshold for ozone, according to EPA AirNow public hourly aggregate data.
The reading came from AQS site ID 040139704, the agency's Fountain Hills station. Maricopa County Air Quality Department is the reporting agency for the station.
Residents seeking current forecasts or any active advisories can monitor the AirNow Phoenix-area page for updates. For health guidance specific to the reading, Maricopa County Air Quality Department is the authoritative source; the county's air quality information is available at maricopa.gov.
The AirNow Phoenix-area page will reflect any changes to the advisory status as conditions develop overnight.
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 00:51
- Maricopa County retrieved 16/05/2026 00:51
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 00:51. Every claim traces to a source.
