Highlights
- The Central Phoenix station (AQS 040133002) recorded ozone at 73.0 PPB at midnight on Aug. 18, 2026.
- That reading crosses AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency; current forecasts are available via AirNow's Phoenix page.
The air quality monitor at Central Phoenix recorded ozone at 73.0 parts per billion at midnight Tuesday, crossing AirNow's threshold for conditions deemed unhealthy for sensitive groups, according to EPA AirNow hourly aggregate data reported by the Maricopa County Air Quality Department.
The reading came from AQS site 040133002. Other pollutants logged at the same hour: carbon monoxide at 0.2 PPM, nitrogen dioxide at 5.0 PPB, and particulate matter (PM10) at 23.0 micrograms per cubic meter, none of which crossed a threshold flag.
Ozone was the sole pollutant of concern in this snapshot. Maricopa County operates a Rapid Response Notification System for High Pollution Advisories and dust events; residents can sign up for email or text alerts through the county's air quality page.
Current conditions and the active forecast for the Phoenix area are posted on AirNow's Phoenix page; check there for any updated advisory status as Tuesday morning progresses.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 18/08/2026 01:55
- Maricopa County retrieved 18/08/2026 01:55
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 18/08/2026 01:55. Every claim traces to a source.
