Highlights
- Central Phoenix ozone reached 71.0 PPB at midnight July 23, per EPA AirNow data from AQS site 040133002.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for ozone.
- Maricopa County Air Quality Department operates the station; residents can track current conditions and forecasts at AirNow's Phoenix page.
- CO registered 0.1 PPM, NO2 at 2.0 PPB, and PM10 at 11.0 UG/M3 during the same hour.
Ozone at the Maricopa County Air Quality Department's Central Phoenix monitor hit 71.0 PPB during the midnight hour on July 23, crossing the AirNow threshold that designates air quality as unhealthy for sensitive groups, according to EPA AirNow hourly aggregate data from AQS site 040133002.
The same reading logged carbon monoxide at 0.1 PPM, nitrogen dioxide at 2.0 PPB, and PM10 particulate matter at 11.0 micrograms per cubic meter.
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 can also report air quality concerns through the county's online form, listed on the Maricopa County Air Quality Department page.
Current readings, forecasts, and any active alerts for the Phoenix area are available at AirNow's Phoenix page. The Arizona Department of Environmental Quality also publishes a Phoenix air quality forecast updated daily.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 23/07/2026 01:17
- Maricopa County retrieved 23/07/2026 01:17
- Maricopa County retrieved 23/07/2026 01:17
- azdeq.gov retrieved 23/07/2026 01:17
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 01:17. Every claim traces to a source.
