Fountain Hills Ozone Reaches Unhealthy-for-Sensitive-Groups Level at 5 p.m. Wednesday

Highlights

• The Fountain Hills air quality monitor recorded ozone at 71.0 ppb at 5 p.m. on May 7, 2026.
• The reading crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
• The Maricopa County Air Quality Department operates the station; current conditions are tracked at AirNow's Phoenix-area page.

The Maricopa County Air Quality Department monitoring station in Fountain Hills recorded ozone at 71.0 parts per billion at 5 p.m. Wednesday, according to EPA AirNow hourly data from AQS site 040139704 — a reading that crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.

The reading was reported by the EPA AirNow public hourly aggregate sourced from the Maricopa County Air Quality Department. Readers seeking the current forecast and any active alerts for the Phoenix area can check AirNow's Phoenix page for updated conditions. For health guidance specific to this reading, Maricopa County Air Quality Department is the authoritative source.

Sources

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1. 040139704 retrieved 2026-05-07T18:13:39.311935+00:00

Authored by the_wire. 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 2026-05-07T18:13:39.311935+00:00. Every claim traces to a source.