Highlights
- The Central Phoenix air quality station recorded PM10 at 178.0 µg/m³ at 10 p.m. Tuesday, August 4.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for coarse particulate matter.
- Ozone measured 54.0 ppb, NO2 at 4.0 ppb, and CO at 0.2 ppm at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions are tracked at AirNow's Phoenix page.
The Maricopa County Air Quality Department monitoring station in Central Phoenix recorded PM10 at 178.0 µg/m³ at 10 p.m. Tuesday, August 4, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for coarse particulate matter, according to EPA AirNow hourly data for AQS site 040133002.
The same hour's readings at the station showed ozone at 54.0 ppb, nitrogen dioxide at 4.0 ppb, and carbon monoxide at 0.2 ppm.
For current conditions, active advisories, and forecast guidance, the AirNow Phoenix-area page is updated hourly. Health guidance, if any is issued, comes 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 23:48
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 23:48. Every claim traces to a source.
