Highlights
- The West Phoenix AQS station recorded PM10 at 306.0 micrograms per cubic meter at 5 p.m. Tuesday, Aug. 4.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10 particulate matter.
- PM2.5 at the same station registered 34.5 micrograms per cubic meter during the same hour.
- Maricopa County Air Quality Department is the reporting agency; current Phoenix-area conditions are tracked at AirNow.
The West Phoenix air monitoring station (AQS site ID 040130019) recorded PM10 particulate matter at 306.0 micrograms per cubic meter at 5 p.m. Tuesday, according to EPA AirNow hourly data reported by the Maricopa County Air Quality Department. That reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10.
The same station recorded PM2.5 at 34.5 micrograms per cubic meter during the same hour. Other pollutants at the station at that time: ozone at 44.0 parts per billion, nitrogen dioxide at 6.0 parts per billion, and carbon monoxide at 0.1 parts per million.
Maricopa County operates a Rapid Response Notification System for dust and pollution spikes at selected monitoring locations across the valley, including a West 43rd Avenue station at 43rd Avenue and Broadway Road. Residents can sign up for email and text alerts through the county's air quality page.
For current forecast conditions and any active advisories for the Phoenix area, see AirNow's Phoenix page. Any health guidance specific to this reading should be sought from 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 18:48
- Maricopa County retrieved 04/08/2026 18:48
- Maricopa County retrieved 04/08/2026 18:48
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 18:48. Every claim traces to a source.
