Highlights
- The West Phoenix air monitoring station recorded PM10 at 173.0 µg/m³ at 3 p.m. on Aug. 4, crossing the unhealthy-for-sensitive-groups breakpoint.
- Maricopa County Air Quality Department is the reporting agency for the AQS site ID 040130019 reading.
- Ozone measured 32.0 ppb and PM2.5 came in at 19.9 µg/m³ at the same hour.
- Readers can track current conditions and active alerts on AirNow's Phoenix-area page.
The West Phoenix air monitoring station recorded PM10 particulate matter at 173.0 µg/m³ at 3 p.m. Tuesday, Aug. 4, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for that pollutant, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
The same hour's readings at AQS site ID 040130019 showed ozone at 32.0 ppb, PM2.5 at 19.9 µg/m³, and carbon monoxide at 0.2 ppm.
Maricopa County operates a Rapid Response Notification System for dust and pollution spikes; residents can sign up for email and text alerts through the county's Air Quality page. Current forecast conditions and any active advisories for the Phoenix metro are available on AirNow's Phoenix page. For health guidance specific to this reading, consult Maricopa County Air Quality Department.
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 16:48
- Maricopa County retrieved 04/08/2026 16:48
- Maricopa County retrieved 04/08/2026 16:48
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 16:48. Every claim traces to a source.
