Highlights
- The South Scottsdale air monitor recorded ozone at 74.0 PPB at 10 p.m. on Sept. 10, 2026.
- The reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for ozone.
- PM10 particulate matter at the same station registered 17.0 micrograms per cubic meter in the same hour.
- Maricopa County Air Quality Department is the reporting agency; current conditions are available on AirNow's Phoenix-area page.
The air quality monitor at South Scottsdale (AQS site ID 040133003) recorded ozone at 74.0 parts per billion at 10 p.m. Wednesday, Sept. 10, 2026, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for ozone, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
PM10 particulate matter at the same station registered 17.0 micrograms per cubic meter during the same hour.
Maricopa County's hot, sunny climate creates conditions that can increase the formation of ground-level ozone, a harmful air pollutant produced when emissions from vehicles and gasoline-powered equipment interact with sunlight, according to a county public notice. The county operates a sign-up service for email and text alerts when a High Pollution Advisory is issued or when dust pollution levels rise at selected monitoring locations.
For health guidance specific to this reading, readers should consult the Maricopa County Air Quality Department directly. Current forecast and active alerts for the Phoenix area are posted on AirNow's 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 10/09/2026 23:39
- Maricopa County retrieved 10/09/2026 23:39
- Maricopa County retrieved 10/09/2026 23:39
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 10/09/2026 23:39. Every claim traces to a source.
