Air Quality
Good
Water Violations
3
Air quality in Fairfax County is rated good with a median AQI of 44 (274 days measured in 2025). 1 community water system serve the area, with 3 recent violations in the last 5 years.
Air Quality — Fairfax 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
113Ozone Daysi
145Drinking 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
1Active Systemsi
1Recent Violationsi
3Recent Violations (Last 5 Years)
VIENNA, TOWN OF