Highlights
- West Phoenix AQS site 040130019 recorded PM2.5 at 195.3 µg/m³ at 4 a.m. Sunday, crossing AirNow's Unhealthy threshold.
- PM10 simultaneously hit 237.0 µg/m³ at the same station, also flagged as unhealthy for sensitive groups or worse.
- Maricopa County Air Quality Department is the reporting agency; current Phoenix-area conditions and any active advisories are posted at AirNow.
The Maricopa County Air Quality Department station in West Phoenix recorded PM2.5 particulate matter at 195.3 µg/m³ at 4 a.m. Sunday, July 5, according to EPA AirNow hourly aggregate data. The reading crossed AirNow's threshold for Unhealthy for Sensitive Groups and extends into the Unhealthy range on the AQI scale.
The same station (AQS site ID 040130019) simultaneously logged PM10 at 237.0 µg/m³, also flagged at unhealthy-for-sensitive-groups or worse. Other pollutants at the hour were CO at 0.8 PPM, NO2 at 34.0 PPB, and ozone at 3.0 PPB.
Maricopa County operates a Rapid Response Notification System that sends email and text alerts when High Pollution Advisories are issued or when dust pollution levels rise at selected monitoring locations across the county.
Readers can track current Phoenix-area air quality conditions, forecasts, and any active alerts at the EPA AirNow Phoenix page. For health guidance specific to Maricopa County, contact the Air Quality Department directly.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 05/07/2026 05:27
- Maricopa County retrieved 05/07/2026 05:27
- Maricopa County retrieved 05/07/2026 05:27
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 05/07/2026 05:27. Every claim traces to a source.
