Highlights
- The West Phoenix monitoring station recorded PM10 at 338.0 UG/M3 at 5 a.m. on Sept. 15, 2026.
- The reading crossed AirNow's unhealthy-for-sensitive-groups threshold for particulate matter.
- PM2.5 at the same station registered 35.4 UG/M3; ozone, NO2, and CO remained at lower levels.
- Maricopa County Air Quality Department operates the station; residents can track current conditions via AirNow.
The West Phoenix air quality monitoring station (AQS site ID 040130019) recorded a PM10 concentration of 338.0 micrograms per cubic meter at 5 a.m. Tuesday, Sept. 15, according to the EPA AirNow hourly aggregate reported by the Maricopa County Air Quality Department. That reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10.
The same station logged PM2.5 at 35.4 UG/M3 during the same hour. Ozone came in at 28.0 parts per billion, nitrogen dioxide at 6.0 parts per billion, and carbon monoxide at 0.3 parts per million.
The Maricopa County Air Quality Department operates the station and issues High Pollution Advisories when conditions warrant. Residents can sign up for email and text alerts through the county's notification system at maricopa.gov/1244/Air-Quality. Current Phoenix-area readings and any active advisories are available on the AirNow Phoenix page.
For health guidance specific to elevated particulate readings, Maricopa County Air Quality Department is the authoritative source.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 15/09/2026 06:23
- Maricopa County retrieved 15/09/2026 06:23
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 15/09/2026 06:23. Every claim traces to a source.
