Highlights
- The South Scottsdale monitoring station (AQS 040133003) recorded PM10 at 1,034 µg/m³ at 5 a.m. Thursday, Aug. 20.
- The reading exceeds AirNow's 'Unhealthy for Sensitive Groups' breakpoint for particulate matter.
- Ozone at the same station measured 41.0 ppb during the same hour, within normal range.
- Maricopa County Air Quality Department is the reporting agency; current conditions and advisories are posted at AirNow's Phoenix-area page.
AIR QUALITY BULLETIN: The South Scottsdale air monitoring station operated by the Maricopa County Air Quality Department recorded a PM10 concentration of 1,034.0 micrograms per cubic meter at 5 a.m. Thursday, Aug. 20, according to the EPA AirNow public hourly aggregate. That reading crosses AirNow's threshold for the 'Unhealthy for Sensitive Groups' category, or worse, for coarse particulate matter.
Ozone at the same station (AQS site ID 040133003) measured 41.0 parts per billion during the same hour.
For current conditions, active advisories, and forecast data for the Phoenix area, Maricopa County Air Quality Department directs residents to AirNow's Phoenix-area page. Maricopa County also offers email and text alerts for High Pollution Advisories and elevated dust readings through its air quality alert program.
The Signal will update this bulletin if Maricopa County Air Quality issues a formal advisory tied to this reading.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133003 retrieved 20/08/2026 06:55
- Maricopa County retrieved 20/08/2026 06:55
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 20/08/2026 06:55. Every claim traces to a source.
