Highlights
- The West Phoenix station (AQS 040130019) recorded ozone at 72.0 PPB at 7 p.m. on Sept. 10, 2026.
- The reading crossed AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
- Carbon monoxide, nitrogen dioxide, PM10, and PM2.5 readings at the same station remained below alert thresholds.
- Maricopa County Air Quality Department is the reporting agency; current Phoenix-area conditions are tracked at AirNow.
The West Phoenix air monitoring station recorded ozone at 72.0 PPB at 7 p.m. Thursday, crossing the AirNow threshold designated Unhealthy for Sensitive Groups, according to data published by the Maricopa County Air Quality Department through the EPA AirNow public hourly aggregate.
The station, identified by AQS site ID 040130019, logged the following readings for the same hour: carbon monoxide at 0.2 PPM, nitrogen dioxide at 4.0 PPB, PM10 at 25.0 UG/M3, and PM2.5 at 5.3 UG/M3. None of those four pollutants triggered an advisory at that hour.
Ozone was the sole pollutant flagged. The 72.0 PPB reading placed it at or above AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
Maricopa County operates a Rapid Response Notification System that sends email and text alerts when a High Pollution Advisory is issued or when dust pollution levels rise at selected monitoring locations across the county.
Readers can check current and forecast conditions for the Phoenix area at the AirNow Phoenix page. For any health guidance related to elevated ozone, 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.
- 040130019 retrieved 10/09/2026 20:39
- Maricopa County retrieved 10/09/2026 20:39
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 10/09/2026 20:39. Every claim traces to a source.
