West Alton

Data time: 9/24/2026 6:00 PM CST

Monitoring Site

Location

Address:: Highway 94
City:: West Alton
Latitude:: 38.8725
Longitude:: -90.2269
Region:: St. Louis

Air Quality Information
Pollutant	Concentration	Units of Measure
NO2	3.2	PPB
8hr-O3	0.027	PPM

https://dnr.mo.gov/air/hows-air/monitoring/sites/west-alton-st-charles

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
18:00	3	Good	NO2	NO2_Direct	None	None
18:00	25	Good	8hr-O3	O3P	None	None
17:00	3	Good	NO2	NO2_Direct	None	None
17:00	25	Good	8hr-O3	O3P	None	None
16:00	2	Good	NO2	NO2_Direct	None	None
16:00	25	Good	8hr-O3	O3P	None	None
15:00	2	Good	NO2	NO2_Direct	None	None
15:00	25	Good	8hr-O3	O3P	None	None
14:00	3	Good	NO2	NO2_Direct	None	None
14:00	24	Good	8hr-O3	O3P	None	None
13:00	2	Good	NO2	NO2_Direct	None	None