Highlights
- The Central Phoenix air quality station recorded PM10 at 423.0 µg/m³ at 5 p.m. Tuesday, August 4.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for PM10 particulate matter.
- Maricopa County Air Quality Department is the reporting agency; readers can track current conditions and forecasts at AirNow.
- Ozone measured 42.0 ppb, NO2 at 5.0 ppb, and CO at 0.2 ppm at the same station and hour.
The Central Phoenix air quality monitoring station (AQS site ID 040133002) recorded PM10 particulate matter at 423.0 µg/m³ at 5 p.m. Tuesday, August 4, 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.
At the same station and hour, ozone measured 42.0 ppb, nitrogen dioxide at 5.0 ppb, and carbon monoxide at 0.2 ppm.
The Maricopa County Air Quality Department operates a rapid-response notification system for dust and pollution advisories. Residents can sign up for email and text alerts through the county's air quality page and track current Phoenix-area readings and any active alerts at AirNow's Phoenix forecast page.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 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.
