Highlights
- Central Phoenix ozone read 75.0 PPB at 8 p.m. Thursday, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- The reading comes from AQS site 040133002, reported by the Maricopa County Air Quality Department via EPA AirNow.
- PM10 at the same station registered 64.0 micrograms per cubic meter during the same hour.
- Readers can track current conditions and any active advisories at AirNow's Phoenix-area page.
Ozone at the Central Phoenix air monitoring station (AQS site 040133002) reached 75.0 parts per billion during the 8 p.m. hour Thursday, July 31, crossing AirNow's threshold for Unhealthy for Sensitive Groups, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
The same station recorded carbon monoxide at 0.2 parts per million, nitrogen dioxide at 6.0 parts per billion, and PM10 at 64.0 micrograms per cubic meter during the same reporting hour.
Maricopa County operates a Rapid Response Notification System for residents who want email or text alerts when pollution levels rise at selected monitoring locations. Sign-up is available through the county's air quality page.
Current readings, forecasts, and any active advisories for the Phoenix area are available at AirNow's Phoenix page. For health guidance specific to this reading, the Maricopa County Air Quality Department is the authoritative source.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 31/07/2026 21:59
- Maricopa County retrieved 31/07/2026 21:59
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 31/07/2026 21:59. Every claim traces to a source.
