Highlights
- The South Scottsdale air monitor recorded ozone at 75.0 PPB at 11 p.m. Tuesday, crossing AirNow's unhealthy-for-sensitive-groups breakpoint.
- PM10 at the same station measured 32.0 micrograms per cubic meter during the same hour.
- Maricopa County Air Quality Department is the reporting agency; readers can track current conditions and forecasts on AirNow's Phoenix-area page.
The EPA AirNow monitor at South Scottsdale (AQS site 040133003) recorded ozone at 75.0 PPB at 11 p.m. Tuesday, May 20, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for ozone, according to the Maricopa County Air Quality Department's hourly aggregate data. PM10 at the same station measured 32.0 micrograms per cubic meter during the same reporting hour.
The reading is reported by the Maricopa County Air Quality Department, which operates the county's network of air monitoring stations and issues High Pollution Advisories when conditions warrant. Residents seeking health guidance should consult Maricopa County Air Quality directly.
Current conditions, forecasts, and any active alerts for the Phoenix area are available on the EPA AirNow Phoenix page.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040133003 retrieved 21/05/2026 00:30
- Maricopa County retrieved 21/05/2026 00:30
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 21/05/2026 00:30. Every claim traces to a source.
