Highlights
- Central Phoenix ozone measured 74.0 PPB at midnight July 3, 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.
- Residents can check current forecasts and any active alerts at AirNow's Phoenix-area page or sign up for Maricopa County advisories.
Ozone at the Central Phoenix air monitoring station hit 74.0 parts per billion at midnight on July 3, crossing AirNow's threshold for Unhealthy for Sensitive Groups, according to EPA AirNow data reported by the Maricopa County Air Quality Department.
The reading was recorded at AQS site 040133002. Other pollutants measured at the same hour: carbon monoxide at 0.1 parts per million, nitrogen dioxide at 5.0 parts per billion, and PM10 particulate matter at 19.0 micrograms per cubic meter.
Maricopa County operates a rapid-response notification system that sends email and text alerts when a High Pollution Advisory is issued or when dust levels rise at selected monitoring locations. Residents can enroll through the county's notification page.
Current forecast conditions and any active alerts for the Phoenix area are available at AirNow's Phoenix page. For health guidance specific to this reading, 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 03/07/2026 01:13
- Maricopa County retrieved 03/07/2026 01:13
- Maricopa County retrieved 03/07/2026 01:13
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 03/07/2026 01:13. Every claim traces to a source.
