Highlights
- The West Phoenix air monitor recorded ozone at 77.0 PPB at 9 p.m. Monday, crossing AirNow's unhealthy-for-sensitive-groups breakpoint.
- Carbon monoxide read 0.0 PPM, nitrogen dioxide 4.0 PPB, PM10 12.0 micrograms per cubic meter, and PM2.5 7.6 micrograms per cubic meter at the same hour.
- Maricopa County Air Quality Department operates the station; readers can track current and forecast conditions at AirNow's Phoenix-area page.
The West Phoenix air quality monitor recorded ozone at 77.0 parts per billion at 9 p.m. Monday, Aug. 17, crossing AirNow's threshold for unhealthy-for-sensitive-groups conditions, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
The reading came from AQS site 040130019. Other pollutants at the same hour: carbon monoxide at 0.0 PPM, nitrogen dioxide at 4.0 PPB, PM10 at 12.0 micrograms per cubic meter, and PM2.5 at 7.6 micrograms per cubic meter.
For current conditions, active advisories, and the Phoenix-area forecast, Maricopa County Air Quality directs residents to AirNow's Phoenix page. The department also operates a Rapid Response Notification System for high-pollution and dust advisories by email or text.
Updated hourly readings will be available through AirNow as conditions develop overnight.
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 22:55
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 22:55. Every claim traces to a source.
