Air quality in Alton
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
2.7 µg/m³
WHO guideline 15
PM10
2.8 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
2:00 AM
💨
PM2.5 2.7 µg/m³
17 Good
3:00 AM
💨
PM2.5 2.8 µg/m³
17 Good
4:00 AM
💨
PM2.5 3 µg/m³
16 Good
5:00 AM
💨
PM2.5 3.4 µg/m³
15 Good
6:00 AM
💨
PM2.5 4.1 µg/m³
17 Good
7:00 AM
💨
PM2.5 5.3 µg/m³
22 Good
8:00 AM
💨
PM2.5 5.7 µg/m³
24 Good
9:00 AM
💨
PM2.5 4.2 µg/m³
20 Good
10:00 AM
💨
PM2.5 2.2 µg/m³
25 Good
11:00 AM
💨
PM2.5 2 µg/m³
29 Good
12:00 PM
💨
PM2.5 2 µg/m³
33 Good
1:00 PM
💨
PM2.5 2.1 µg/m³
35 Good
Next few days daily max · US EPA AQI
Sat
💨
Moderate · UV Low
75
Sun
💨
Moderate · UV Low
77
Mon
💨
Moderate · UV Low
72
Tue
💨
Moderate · UV Low
58
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain