Highlights
- The West Phoenix AQS monitor recorded PM10 at 3,785 micrograms per cubic meter at 6 a.m. Tuesday, August 4.
- PM2.5 at the same station hit 349.5 micrograms per cubic meter, crossing AirNow's unhealthy-for-sensitive-groups threshold.
- Maricopa County Air Quality Department operates the station; current conditions and active alerts are posted at AirNow's Phoenix page.
- CO registered at 0.0 PPM and NO2 at 2.0 PPB at the same reporting hour.
The West Phoenix air quality monitor operated by the Maricopa County Air Quality Department recorded PM10 at 3,785 micrograms per cubic meter at 6 a.m. Tuesday, August 4, according to EPA AirNow hourly aggregate data. The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for particulate matter.
PM2.5 at the same station, AQS site 040130019, reached 349.5 micrograms per cubic meter during the same hour, also above the unhealthy-for-sensitive-groups threshold. Carbon monoxide registered at 0.0 PPM and nitrogen dioxide at 2.0 PPB.
The Maricopa County Air Quality Department maintains a rapid-response notification system that sends email and text alerts when dust pollution levels rise at selected monitoring locations, including a West 43rd Avenue station at 43rd Avenue and Broadway Road. Residents can sign up through the county's air quality page or check the Rapid Response Notification System for station-level alerts.
For the current forecast and any active advisories covering the Phoenix area, the AirNow Phoenix page reflects the latest conditions as Maricopa County updates readings throughout the day.
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 07:48
- Maricopa County retrieved 04/08/2026 07:48
- Maricopa County retrieved 04/08/2026 07:48
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 07:48. Every claim traces to a source.
