Highlights
- Ozone at the Central Phoenix AQS station (040133002) measured 73.0 PPB at midnight on Aug. 11, 2026.
- That reading crossed AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone.
- CO, NO2, and PM10 readings at the same hour remained within lower concern ranges.
- Maricopa County Air Quality Department is the reporting agency; current forecasts are at AirNow's Phoenix page.
Ozone at the Central Phoenix air monitoring station reached 73.0 parts per billion at midnight Tuesday, crossing the threshold AirNow designates as unhealthy for sensitive groups, according to EPA AirNow hourly data reported by the Maricopa County Air Quality Department.
The station, identified by AQS site ID 040133002, recorded the following readings for the midnight hour: carbon monoxide at 0.2 parts per million, nitrogen dioxide at 4.0 PPB, ozone at 73.0 PPB, and particulate matter (PM10) at 35.0 micrograms per cubic meter. Only the ozone figure triggered the elevated designation.
For current forecasts and any active advisories covering the Phoenix area, the Maricopa County Air Quality Department directs residents to AirNow's Phoenix forecast page. Residents can also sign up for High Pollution Advisory alerts and dust-level notifications through Maricopa County's air quality alert system.
Updated hourly readings for the Central Phoenix station are available through AirNow as conditions develop through Tuesday.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 11/08/2026 01:45
- Maricopa County retrieved 11/08/2026 01:45
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 11/08/2026 01:45. Every claim traces to a source.
