Highlights
- The Central Phoenix air monitoring station recorded PM10 at 504.0 micrograms per cubic meter at 7 a.m. Tuesday, Aug. 4.
- That reading exceeds AirNow's unhealthy-for-sensitive-groups breakpoint for PM10 particulate matter.
- Maricopa County Air Quality Department operates the station; residents can track current conditions and active alerts via AirNow.
- Other pollutants at the same station — CO, NO2, and ozone — were within normal ranges at the same hour.
The Central Phoenix air monitoring station (AQS site ID 040133002) recorded PM10 particulate matter at 504.0 micrograms per cubic meter at 7 a.m. Tuesday, Aug. 4, according to EPA AirNow hourly aggregate data reported by the Maricopa County Air Quality Department. That reading crosses AirNow's unhealthy-for-sensitive-groups breakpoint for PM10.
Other pollutants measured at the same station and hour were: carbon monoxide at 0.1 PPM, nitrogen dioxide at 1.0 PPB, and ozone at 42.0 PPB.
Maricopa County operates a Rapid Response Notification System that sends email and text alerts when dust pollution levels rise at selected monitoring locations, including a South Phoenix station at Central Avenue. Residents can sign up for those alerts through the county's website.
Current conditions, forecast AQI, and any active advisories for the Phoenix area are available on the AirNow Phoenix page. The Arizona Department of Environmental Quality also publishes a Phoenix-area air quality forecast.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133002 retrieved 04/08/2026 08:48
- Maricopa County retrieved 04/08/2026 08:48
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 04/08/2026 08:48. Every claim traces to a source.
