Air quality in Saint Charles
The US Air Quality Index (EPA) grades air from 0 to 500 using fine particles (PM2.5/PM10), ozone and nitrogen dioxide. 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and anything higher affects everyone.
PM2.5
3.7 µg/m³
WHO guideline 15
PM10
3.7 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
3:00 PM
💨
PM2.5 3.7 µg/m³
51Moderate
4:00 PM
💨
PM2.5 3.6 µg/m³
50Good
5:00 PM
💨
PM2.5 3.6 µg/m³
48Good
6:00 PM
💨
PM2.5 4.4 µg/m³
42Good
7:00 PM
💨
PM2.5 5.8 µg/m³
35Good
8:00 PM
💨
PM2.5 7.6 µg/m³
32Good
9:00 PM
💨
PM2.5 9 µg/m³
38Good
10:00 PM
💨
PM2.5 9.5 µg/m³
40Good
11:00 PM
💨
PM2.5 10.3 µg/m³
43Good
12:00 AM
💨
PM2.5 11.9 µg/m³
50Good
1:00 AM
💨
PM2.5 13.7 µg/m³
54Moderate
2:00 AM
💨
PM2.5 15.1 µg/m³
57Moderate
Next few days
daily max · US EPA AQI
Tue
💨
Moderate · UV High
51
Wed
💨
Moderate · UV Very high
78
Thu
💨
Good · UV Moderate
49
Fri
💨
Unhealthy for Sensitive Groups · UV High
113
Sat
💨
Moderate · UV High
54