Highlights
- Ozone at the West Phoenix AQS station (040130019) read 76.0 PPB at 9 p.m. on Aug. 10, 2026.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for ozone.
- CO, NO2, PM10, and PM2.5 readings at the same station remained within normal ranges at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current Phoenix-area conditions are at AirNow.
Ozone at the West Phoenix air monitoring station reached 76.0 parts per billion at 9 p.m. Monday, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for ozone, according to data reported by the Maricopa County Air Quality Department via the EPA AirNow public hourly aggregate.
The reading came from AQS site 040130019, the West Phoenix station. Other pollutants logged at the same hour were within normal ranges: carbon monoxide at 0.2 PPM, nitrogen dioxide at 4.0 PPB, PM10 at 17.0 micrograms per cubic meter, and PM2.5 at 5.1 micrograms per cubic meter.
For current conditions, active alerts, and forecast guidance, Maricopa County residents can check the AirNow Phoenix-area page. Maricopa County also operates a Rapid Response Notification System for high-pollution advisories and dust alerts at selected monitoring locations across the valley.
Updated hourly readings will be posted to AirNow as the overnight period progresses.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 10/08/2026 22:45
- Maricopa County retrieved 10/08/2026 22:45
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 10/08/2026 22:45. Every claim traces to a source.
