Air quality in St. 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
5.1 µg/m³
WHO guideline 15
PM10
5.7 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
9:00 PM
💨
PM2.5 5.1 µg/m³
21 Good
10:00 PM
💨
PM2.5 4.9 µg/m³
20 Good
11:00 PM
💨
PM2.5 4.8 µg/m³
20 Good
12:00 AM
💨
PM2.5 4.5 µg/m³
20 Good
1:00 AM
💨
PM2.5 4.2 µg/m³
21 Good
2:00 AM
💨
PM2.5 4 µg/m³
21 Good
3:00 AM
💨
PM2.5 3.9 µg/m³
22 Good
4:00 AM
💨
PM2.5 3.7 µg/m³
22 Good
5:00 AM
💨
PM2.5 3.6 µg/m³
21 Good
6:00 AM
💨
PM2.5 3.6 µg/m³
21 Good
7:00 AM
💨
PM2.5 3.8 µg/m³
21 Good
8:00 AM
💨
PM2.5 4.2 µg/m³
21 Good
Next few days daily max · US EPA AQI
Sat
💨
Good · UV Moderate
36
Sun
💨
Good · UV Moderate
38
Mon
💨
Moderate · UV Moderate
91
Tue
💨
Unhealthy for Sensitive Groups · UV Moderate
128
Wed
💨
Moderate · UV Moderate
96
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain