Highlights
- The Central Phoenix air monitor recorded ozone at 80.0 PPB at 10 p.m. on Aug. 17, crossing AirNow's unhealthy-for-sensitive-groups breakpoint.
- Carbon monoxide read 0.2 PPM, nitrogen dioxide 4.0 PPB, and PM10 24.0 micrograms per cubic meter at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions and any active advisories are posted at AirNow's Phoenix page.
The Central Phoenix air quality monitor (AQS site 040133002) recorded ozone at 80.0 PPB at 10 p.m. Monday, Aug. 17, crossing AirNow's threshold for the Unhealthy for Sensitive Groups category, according to the EPA AirNow hourly aggregate reported by the Maricopa County Air Quality Department.
The same hour's readings at the station: carbon monoxide at 0.2 PPM, nitrogen dioxide at 4.0 PPB, and particulate matter PM10 at 24.0 micrograms per cubic meter.
Readers seeking current forecasts, active advisories, or health guidance should check AirNow's Phoenix-area page and the Maricopa County Air Quality Department, which operates the Rapid Response Notification System for high-pollution and dust advisories. The county also offers email and text alerts when a High Pollution Advisory is issued.
Updated hourly readings for the Central Phoenix station will post to AirNow as conditions change through the overnight hours.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 17/08/2026 23:55
- Maricopa County retrieved 17/08/2026 23:55
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 17/08/2026 23:55. Every claim traces to a source.
