Highlights
- The West Phoenix air monitoring station recorded ozone at 78.0 parts per billion at 5 p.m. Tuesday, July 14.
- That reading crossed AirNow's 'Unhealthy for Sensitive Groups' breakpoint for ozone.
- Maricopa County Air Quality Department is the reporting agency; residents can track current conditions and forecasts via AirNow.
The West Phoenix air monitoring station (AQS site 040130019) recorded ozone at 78.0 parts per billion at 5 p.m. Tuesday, July 14, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department. That reading crossed AirNow's threshold flagged as unhealthy for sensitive groups for ozone.
Other pollutants recorded at the same station and hour: carbon monoxide at 0.2 parts per million, nitrogen dioxide at 12.0 parts per billion, PM10 at 20.0 micrograms per cubic meter, and PM2.5 at 9.5 micrograms per cubic meter.
Residents can monitor current conditions, forecasts, and any active advisories for the Phoenix area through AirNow's Phoenix page. For health guidance specific to Maricopa County, the Maricopa County Air Quality Department maintains advisories and a rapid-response notification system for elevated pollution events.
The next hourly reading from the West Phoenix station is expected at 6 p.m.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 14/07/2026 18:35
- Maricopa County retrieved 14/07/2026 18:35
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 14/07/2026 18:35. Every claim traces to a source.
