Air Quality
Good
Water Violations
101
Air quality in Armstrong County is rated good with a median AQI of 42 (210 days measured in 2025). 5 community water systems serve the area, with 101 recent violations in the last 5 years.
Air Quality — Armstrong County (2025)i
AQSThe Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.
Median AQI
PM2.5 Daysi
111Ozone Daysi
99Drinking Wateri
SDWISPublic water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Violations indicate a system failed to meet federal drinking water standards.
Community Systemsi
5Active Systemsi
3Recent Violationsi
101Recent Violations (Last 5 Years)