Highlights
- The West Phoenix air monitoring station recorded ozone at 78.0 PPB at 10 p.m. on Aug. 18, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- Maricopa County Air Quality Department is the reporting agency for the AQS site ID 040130019 reading.
- Residents can track current conditions and active alerts on the AirNow Phoenix-area page or sign up for county notifications at maricopa.gov.
The West Phoenix air monitoring station (AQS site 040130019) recorded ozone at 78.0 PPB at 10 p.m. Tuesday, Aug. 18, crossing AirNow's threshold for Unhealthy for Sensitive Groups, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
Other pollutants at the station during the same hour: carbon monoxide at 0.0 PPM, nitrogen dioxide at 4.0 PPB, PM10 at 15.0 UG/M3, and PM2.5 at 6.0 UG/M3.
For current forecasts and any active advisories, the AirNow Phoenix-area page is updated hourly. Maricopa County also operates a Rapid Response Notification System for email and text alerts when High Pollution Advisories are issued or dust levels spike at selected monitoring locations.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 18/08/2026 23:55
- Maricopa County retrieved 18/08/2026 23:55
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 18/08/2026 23:55. Every claim traces to a source.
