Highlights
- The West Phoenix air monitoring station recorded ozone at 74.0 PPB at 7 p.m. Monday, Aug. 10.
- That reading crosses AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency; current Phoenix-area conditions are at AirNow.gov.
The West Phoenix air monitoring station (AQS site 040130019) recorded ozone at 74.0 PPB at 7 p.m. Monday, Aug. 10, according to EPA AirNow hourly data reported by the Maricopa County Air Quality Department. That reading crosses AirNow's threshold for the "Unhealthy for Sensitive Groups" category for ozone.
Other pollutants at the same station and hour: carbon monoxide at 0.2 PPM, nitrogen dioxide at 3.0 PPB, PM10 at 26.0 micrograms per cubic meter, and PM2.5 at 3.3 micrograms per cubic meter.
Readers can check current Phoenix-area air quality conditions and any active advisories at AirNow's Phoenix page. For Maricopa County-specific alerts, the county's Rapid Response Notification System allows residents to sign up for High Pollution Advisory notices by email or text.
Updated hourly readings from Maricopa County monitoring stations are available at AirNow.gov.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 10/08/2026 20:45
- Maricopa County retrieved 10/08/2026 20:45
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 10/08/2026 20:45. Every claim traces to a source.
