Arnold West

Data time: 9/25/2026 5:00 PM CST

Monitoring Site

Location

Address:: 1709 Lonedell Dr.
City:: Arnold
Latitude:: 38.4489
Longitude:: -90.398595
Region:: St. Louis

Air Quality Information
Pollutant	Concentration	Units of Measure
NO2	3.9	PPB
8hr-O3	0.03	PPM
PM10	12	ug/m3
PM2.5	4.7	ug/m3

https://dnr.mo.gov/air/hows-air/monitoring/sites/arnold-west-jefferson

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
17:00	4	Good	NO2	NO2_Direct	None	None
17:00	28	Good	8hr-O3	O3P	None	None
17:00	11	Good	PM10	PM-10	None	None
17:00	26	Good	PM2.5	PM25FEM	None	None
16:00	4	Good	NO2	NO2_Direct	None	None
16:00	27	Good	8hr-O3	O3P	None	None
16:00	11	Good	PM10	PM-10	None	None
16:00	25	Good	PM2.5	PM25FEM	None	None
15:00	4	Good	NO2	NO2_Direct	None	None
15:00	28	Good	8hr-O3	O3P	None	None
15:00	11	Good	PM10	PM-10	None	None
15:00	24	Good	PM2.5	PM25FEM	None	None
14:00	3	Good	NO2	NO2_Direct	None	None
14:00	29	Good	8hr-O3	O3P	None	None
14:00	11	Good	PM10	PM-10	None	None
14:00	24	Good	PM2.5	PM25FEM	None	None
13:00	2	Good	NO2	NO2_Direct	None	None
13:00	29	Good	8hr-O3	O3P	None	None
13:00	11	Good	PM10	PM-10	None	None
13:00	24	Good	PM2.5	PM25FEM	None	None
12:00	2	Good	NO2	NO2_Direct	None	None
12:00	29	Good	8hr-O3	O3P	None	None
12:00	11	Good	PM10	PM-10	None	None