Highlights
- The West Phoenix AQS station recorded ozone at 74.0 PPB at midnight July 4, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- Maricopa County Air Quality Department is the reporting agency for the reading at AQS site ID 040130019.
- Readers can check current forecasts and any active alerts on the AirNow Phoenix-area page.
The West Phoenix air quality monitoring station recorded ozone at 74.0 PPB at midnight on July 4, crossing AirNow's threshold for Unhealthy for Sensitive Groups, according to data reported by the Maricopa County Air Quality Department.
The reading came from AQS site ID 040130019. Other pollutants logged at the same hour were within normal ranges: carbon monoxide at 0.1 PPM, nitrogen dioxide at 2.0 PPB, PM10 at 15.0 micrograms per cubic meter, and PM2.5 at 5.0 micrograms per cubic meter.
For current forecast conditions and any active advisories, the AirNow Phoenix-area page is the authoritative source. Maricopa County also operates a Rapid Response Notification System for residents who want email or text alerts when pollution levels rise at selected monitoring locations. Any health guidance specific to this reading should be sought from 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 04/07/2026 01:27
- Maricopa County retrieved 04/07/2026 01:27
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 04/07/2026 01:27. Every claim traces to a source.
