Highlights
- The Central Phoenix air monitor logged ozone at 82.0 PPB at 11 p.m. Monday, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- Carbon monoxide and particulate matter readings at the same station remained within normal ranges at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions and forecasts are available at AirNow's Phoenix page.
The Central Phoenix air quality monitor recorded ozone at 82.0 PPB at 11 p.m. Monday, August 17, crossing the threshold that EPA AirNow designates as Unhealthy for Sensitive Groups, according to the hourly aggregate published by the Maricopa County Air Quality Department.
The reading came from AQS site 040133002, the Central Phoenix station. At the same hour, carbon monoxide measured 0.2 PPM and PM10 measured 19.0 UG/M3. Nitrogen dioxide registered 5.0 PPB.
Maricopa County operates a Rapid Response Notification System that sends email and text alerts when High Pollution Advisories are issued or when dust levels rise at selected monitoring locations. Residents seeking health guidance should consult the Maricopa County Air Quality Department directly.
Current readings, hourly updates, and any active advisories for the Phoenix area are available 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 18/08/2026 00:55
- Maricopa County retrieved 18/08/2026 00:55
- Maricopa County retrieved 18/08/2026 00:55
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 18/08/2026 00:55. Every claim traces to a source.
