Highlights
- The Central Phoenix air monitor recorded PM10 at 423.0 micrograms per cubic meter at 4 a.m. Monday, Aug. 31.
- That reading exceeds AirNow's unhealthy-for-sensitive-groups breakpoint for PM10 particulate matter.
- Maricopa County Air Quality Department is the reporting agency; residents can track current conditions and active alerts at AirNow's Phoenix page.
The Central Phoenix air quality monitor (AQS site 040133002) recorded PM10 particulate matter at 423.0 micrograms per cubic meter at 4 a.m. Monday, Aug. 31, according to EPA AirNow hourly aggregate data reported by the Maricopa County Air Quality Department. That reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10.
Other pollutants recorded at the same station and hour: carbon monoxide at 0.1 PPM, nitrogen dioxide at 1.0 PPB, and ozone at 39.0 PPB.
Residents can check current conditions, forecasts, and any active advisories on AirNow's Phoenix-area page. For guidance specific to Maricopa County, the Air Quality Department maintains a rapid-response notification system for high-pollution advisories and dust events. Updated hourly readings are expected through the morning.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 31/08/2026 05:21
- Maricopa County retrieved 31/08/2026 05:21
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 31/08/2026 05:21. Every claim traces to a source.
