Highlights
- Central Phoenix ozone reached 77.0 PPB at 8 p.m. Monday, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- The reading came from AQS site 040133002, operated by the Maricopa County Air Quality Department.
- PM10 also registered at 53.0 micrograms per cubic meter at the same station and hour.
- Readers can track current and forecast conditions at AirNow's official Phoenix-area page.
The Maricopa County Air Quality Department recorded an ozone concentration of 77.0 parts per billion at the Central Phoenix monitoring station (AQS site 040133002) during the 8 p.m. hour Monday, August 10, crossing EPA AirNow's Unhealthy for Sensitive Groups breakpoint for ozone.
The same station logged PM10 at 53.0 micrograms per cubic meter, carbon monoxide at 0.2 parts per million, and nitrogen dioxide at 4.0 parts per billion during the same reporting hour.
The data were published through the EPA AirNow public hourly aggregate. Maricopa County Air Quality Department is the reporting agency for the station. Readers seeking current readings, forecasts, or any active advisories should consult AirNow's official Phoenix-area page. For dust-related or other air quality concerns, the county operates a Rapid Response Notification System and an online reporting form for violations.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 10/08/2026 21:45
- Maricopa County retrieved 10/08/2026 21:45
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 10/08/2026 21:45. Every claim traces to a source.
