Highlights
- West Phoenix station AQS 040130019 recorded PM10 at 396.0 UG/M3 at 6 p.m. on Aug. 4, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- PM2.5 at the same station simultaneously reached 45.1 UG/M3, also flagged at the Unhealthy for Sensitive Groups threshold or worse.
- Maricopa County Air Quality Department operates the station; readers can track current conditions and active alerts via AirNow's Phoenix-area page.
The Maricopa County Air Quality Department monitoring station in West Phoenix recorded a PM10 concentration of 396.0 micrograms per cubic meter at 6 p.m. Tuesday, Aug. 4, crossing the AirNow threshold designated as Unhealthy for Sensitive Groups or worse, according to EPA AirNow public hourly aggregate data.
The same station simultaneously logged PM2.5 at 45.1 UG/M3, also flagged at the Unhealthy for Sensitive Groups level or worse. Other pollutants at the station at that hour included ozone at 46.0 parts per billion, nitrogen dioxide at 5.0 parts per billion, and carbon monoxide at 0.1 parts per million.
The station's AQS site ID is 040130019. Maricopa County operates a Rapid Response Notification System that covers multiple valley locations, including a West 43rd Avenue site at 43rd Avenue and Broadway Road.
Readers can monitor current conditions, forecasts, and any active advisories for the Phoenix area through EPA AirNow's Phoenix page. For health guidance specific to elevated particulate readings, contact the Maricopa County Air Quality Department directly.
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 19:48
- Maricopa County retrieved 04/08/2026 19:48
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 19:48. Every claim traces to a source.
