Environment
FRANCIS HOWELL UNION HIGH — Environment & Air Quality
Air quality, drinking-water safety and environmental hazards within 1–5 miles of FRANCIS HOWELL UNION HIGH in O'Fallon, Missouri.
Latest Air Quality Index
34
Good · monitor 32.7 km away
Water health violations 10yr0
TRI sites within 1 mi1
Air Quality
EPA AirNow + AQS · 2024
34
AQI latest — Good
34
AQI 7-day avg
3
Days unhealthy in last 90
49.8
Ozone annual ppb
19.4
NO₂ annual ppb
Public Water System
ST CHARLES COUNTY PWSD 2 · PWS MO6024530
0
Health-based violations (10yr)
0
Acute violations (10yr)
100,587
Population served
31
Most recent violation type
2025-06-01
Nearby Environmental Hazards
EPA Superfund (NPL), TRI release sites, brownfields (2024)
1
TRI sites within 1 mile
6
TRI sites within 5 miles
1.6 mi
Nearest Superfund (NPL)
WELDON SPRING QUARRY PLANT PITS USDOE ARMY
6.5 mi
Nearest brownfield
SISTERS OF THE MOST PRECIOUS BLOOD CONVENT
Sources: school_air_quality + school_air_quality_daily (EPA AQS / AirNow), school_water_safety (EPA SDWIS), school_env_hazards (EPA NPL / TRI / Brownfields).