Highlights
- The West Phoenix air monitor (AQS site 040130019) recorded PM10 at 168.0 µg/m³ at 9 p.m. Tuesday.
- That reading crosses AirNow's Unhealthy for Sensitive Groups breakpoint for coarse particulate matter.
- Ozone at the same station measured 55.0 ppb; PM2.5 came in at 17.2 µg/m³ for the same hour.
- Maricopa County Air Quality Department operates the station; current Phoenix-area conditions are tracked at AirNow.
The West Phoenix air quality monitor recorded PM10 at 168.0 µg/m³ at 9 p.m. Tuesday, Aug. 4, crossing AirNow's Unhealthy for Sensitive Groups breakpoint for coarse particulate matter, according to EPA AirNow hourly data reported by the Maricopa County Air Quality Department.
The reading came from AQS site 040130019, the West Phoenix station. Other pollutants logged at the same hour: ozone at 55.0 ppb, PM2.5 at 17.2 µg/m³, NO2 at 3.0 ppb, and CO at 0.0 ppm.
Maricopa County operates a Rapid Response Notification System that sends email and text alerts when a High Pollution Advisory is issued or 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.
For the current Phoenix-area forecast and any active advisories, the AirNow Phoenix page is the authoritative source. Health guidance for sensitive groups should be sought from 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 22:48
- Maricopa County retrieved 04/08/2026 22:48
- Maricopa County retrieved 04/08/2026 22:48
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 22:48. Every claim traces to a source.
