Highlights
- The West Phoenix air monitor recorded ozone at 75.0 PPB at 1 a.m. Thursday, July 23.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency; current conditions are available on AirNow's Phoenix page.
The EPA AirNow monitor at West Phoenix (AQS site ID 040130019) recorded ozone at 75.0 PPB at 1 a.m. Thursday, July 23, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for ozone, according to the Maricopa County Air Quality Department's hourly aggregate data.
Other pollutants at the same station and hour were within normal ranges: carbon monoxide at 0.1 PPM and nitrogen dioxide at 2.0 PPB. Particulate matter readings were PM10 at 3.0 UG/M3 and PM2.5 at -0.2 UG/M3.
For the current forecast and any active advisories, readers can check AirNow's Phoenix-area page. Maricopa County also offers a Rapid Response Notification System for alerts at specific monitoring locations across the valley. For health guidance related to air quality conditions, contact the 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.
- 040130019 retrieved 23/07/2026 02:17
- Maricopa County retrieved 23/07/2026 02:17
- Maricopa County retrieved 23/07/2026 02:17
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 23/07/2026 02:17. Every claim traces to a source.
