Highlights
- The West Phoenix air quality station logged PM10 at 247.0 micrograms per cubic meter at 8 p.m. Tuesday, Aug. 4.
- That reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for coarse particulate matter.
- Ozone registered 53.0 PPB and PM2.5 at 27.9 UG/M3 at the same hour; CO and NO2 were negligible.
- Maricopa County Air Quality Department operates the station; current conditions and any active advisories are posted at AirNow's Phoenix page.
The West Phoenix air monitoring station (AQS site ID 040130019) recorded PM10 at 247.0 micrograms per cubic meter at 8 p.m. Tuesday, Aug. 4, according to EPA AirNow hourly aggregate data reported by the Maricopa County Air Quality Department. That figure crossed AirNow's unhealthy-for-sensitive-groups breakpoint for coarse particulate matter.
At the same hour, the station logged ozone at 53.0 PPB, PM2.5 at 27.9 UG/M3, NO2 at 3.0 PPB, and CO at 0.0 PPM.
Maricopa County Air Quality Department operates the monitoring network and issues High Pollution Advisories when conditions warrant. Residents can sign up for email and text alerts through the county's notification system. Current readings, forecasts, and any active advisories for the Phoenix area are available at AirNow's Phoenix page.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 04/08/2026 21:48
- Maricopa County retrieved 04/08/2026 21:48
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 04/08/2026 21:48. Every claim traces to a source.
