Highlights
- The West Phoenix monitoring station recorded ozone at 74.0 PPB at 8 p.m. on Aug. 17, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- Carbon monoxide, nitrogen dioxide, PM10, and PM2.5 readings at the same station remained within normal ranges at the same hour.
- Maricopa County Air Quality Department operates the station; residents can track current conditions and active alerts at AirNow's Phoenix-area page.
The West Phoenix air quality monitoring station (AQS site ID 040130019) recorded ozone at 74.0 PPB at 8 p.m. Monday, Aug. 17, crossing the threshold that EPA AirNow designates as Unhealthy for Sensitive Groups, according to the hourly aggregate published by the Maricopa County Air Quality Department.
Other pollutants measured at the station during the same hour were within normal ranges: carbon monoxide at 0.1 PPM, nitrogen dioxide at 5.0 PPB, PM10 at 8.0 UG/M3, and PM2.5 at 5.3 UG/M3.
Residents seeking current forecasts or active advisories for the Phoenix area can check AirNow's Phoenix page directly. For health guidance specific to Maricopa County, the Maricopa County Air Quality Department is the authoritative source. The department also operates a Rapid Response Notification System for dust and pollution alerts at specific monitoring locations across the valley.
Updated hourly readings for the West Phoenix station 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 17/08/2026 21:55
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 17/08/2026 21:55. Every claim traces to a source.
