Highlights
- The Central Phoenix air monitoring station recorded PM10 at 514.0 micrograms per cubic meter at 7 p.m. Tuesday, Aug. 4.
- That reading crossed AirNow's threshold for Unhealthy for Sensitive Groups or worse for coarse particulate matter.
- Ozone registered 49.0 PPB, CO at 0.2 PPM, and NO2 at 5.0 PPB at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions and active alerts are posted at AirNow's Phoenix page.
The Maricopa County Air Quality Department monitoring station in Central Phoenix recorded PM10, coarse particulate matter, at 514.0 micrograms per cubic meter at 7 p.m. Tuesday, Aug. 4, according to EPA AirNow hourly aggregate data. That reading crossed AirNow's threshold for Unhealthy for Sensitive Groups or worse.
At the same hour, the station (AQS site ID 040133002) logged ozone at 49.0 PPB, nitrogen dioxide at 5.0 PPB, and carbon monoxide at 0.2 PPM.
For current conditions, forecasts, and any active advisories, Maricopa County residents can check AirNow's Phoenix-area page. Health guidance, if issued, will come 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.
- 040133002 retrieved 04/08/2026 20:48
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 20:48. Every claim traces to a source.
