Highlights
- The South Scottsdale air quality station recorded ozone at 71.0 PPB at 6 p.m. Wednesday, May 21.
- That reading crossed AirNow's unhealthy-for-sensitive-groups breakpoint for ozone.
- PM10 particulate matter at the same station measured 19.0 micrograms per cubic meter at the same hour.
- Readers can track current and forecast conditions at AirNow's Phoenix-area page.
The Maricopa County Air Quality Department South Scottsdale monitoring station (AQS site ID 040133003) recorded ozone at 71.0 parts per billion at 6 p.m. Wednesday, May 21, crossing AirNow's unhealthy-for-sensitive-groups breakpoint for ozone, according to the EPA AirNow public hourly aggregate.
PM10 particulate matter at the same station measured 19.0 micrograms per cubic meter during the same hour.
For current readings, active advisories, and the Phoenix-area forecast, the EPA AirNow Phoenix page is updated hourly. Health guidance, if any is issued, will come from Maricopa County Air Quality.
Sources
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- 040133003 retrieved 21/05/2026 19:31
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 19:31. Every claim traces to a source.
