Highlights
- The West Phoenix monitoring station (AQS 040130019) recorded PM10 at 424.0 micrograms per cubic meter at 8 a.m. Tuesday.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10; PM2.5 also registered at 35.7 micrograms per cubic meter.
- Maricopa County Air Quality Department is the reporting agency; readers can track current conditions and any active alerts via AirNow's Phoenix page.
The West Phoenix air quality monitoring station logged PM10 particulate matter at 424.0 micrograms per cubic meter at 8 a.m. Tuesday, August 4, according to EPA AirNow hourly aggregate data reported by the Maricopa County Air Quality Department. The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10.
The same station recorded PM2.5 at 35.7 micrograms per cubic meter during the same hour, also at the unhealthy-for-sensitive-groups threshold or above. Other pollutants at the station registered at lower levels: ozone at 42.0 parts per billion, nitrogen dioxide at 3.0 parts per billion, and carbon monoxide at 0.0 parts per million.
Maricopa County operates a Rapid Response Notification System for dust and pollution alerts at selected monitoring locations across the valley. Current conditions and any active advisories for the Phoenix area are available through AirNow's Phoenix forecast 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 09:48
- Maricopa County retrieved 04/08/2026 09:48
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 09:48. Every claim traces to a source.
