Highlights
- The West Phoenix station (AQS site 040130019) recorded ozone at 74.0 PPB at 7 p.m. on Aug. 26, crossing AirNow's Unhealthy for Sensitive Groups threshold.
- Carbon monoxide, nitrogen dioxide, and particulate readings at the same station remained within normal ranges at the same hour.
- Maricopa County Air Quality Department is the reporting agency; readers can track current and forecast conditions at AirNow's Phoenix-area page.
The West Phoenix air monitoring station recorded ozone at 74.0 parts per billion at 7 p.m. Wednesday, Aug. 26, crossing the AirNow threshold designated Unhealthy for Sensitive Groups, according to the EPA AirNow hourly aggregate reported by the Maricopa County Air Quality Department.
The reading comes from AQS site 040130019. Other pollutants measured at the same station and hour were within lower ranges: carbon monoxide at 0.2 parts per million, nitrogen dioxide at 5.0 parts per billion, PM10 at 22.0 micrograms per cubic meter, and PM2.5 at 5.1 micrograms per cubic meter.
For current conditions, active alerts, and the Phoenix-area forecast, Maricopa County Air Quality directs residents to AirNow's Phoenix page. The county also operates a Rapid Response Notification System for email and text alerts when High Pollution Advisories are issued or when dust levels rise at selected monitoring locations.
Any health guidance for sensitive groups will come from Maricopa County Air Quality Department. Updated hourly readings are expected through the evening.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 26/08/2026 20:22
- Maricopa County retrieved 26/08/2026 20:22
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 26/08/2026 20:22. Every claim traces to a source.
