Highlights
- West Phoenix ozone reached 76.0 PPB at 8 p.m. on Aug. 21, crossing AirNow's Unhealthy for Sensitive Groups breakpoint.
- The reading was recorded at AQS site 040130019; CO, NO2, PM10, and PM2.5 levels remained low at the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions and forecasts are available at AirNow's Phoenix page.
The Maricopa County Air Quality Department recorded an ozone concentration of 76.0 parts per billion at the West Phoenix monitoring station (AQS site 040130019) at 8 p.m. Friday, Aug. 21, crossing the EPA AirNow threshold for Unhealthy for Sensitive Groups.
Other pollutants measured at the same station and hour remained well below concern levels: carbon monoxide at 0.2 PPM, nitrogen dioxide at 3.0 PPB, PM10 at 10.0 micrograms per cubic meter, and PM2.5 at 3.5 micrograms per cubic meter.
Readers can track current conditions and any active advisories for the Phoenix area through the EPA AirNow Phoenix page. For health guidance related to elevated ozone, Maricopa County Air Quality Department is the authoritative local source.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 21/08/2026 21:56
- Maricopa County retrieved 21/08/2026 21:56
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 21/08/2026 21:56. Every claim traces to a source.
