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
8.4 µg/m³
WHO guideline 15
PM10
8.8 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
8:00 PM
💨
PM2.5 8.4 µg/m³
40Good
9:00 PM
💨
PM2.5 8.4 µg/m³
36Good
10:00 PM
💨
PM2.5 7.8 µg/m³
34Good
11:00 PM
💨
PM2.5 7.3 µg/m³
34Good
12:00 AM
💨
PM2.5 7 µg/m³
36Good
1:00 AM
💨
PM2.5 6.7 µg/m³
38Good
2:00 AM
💨
PM2.5 6.5 µg/m³
38Good
3:00 AM
💨
PM2.5 6.3 µg/m³
37Good
4:00 AM
💨
PM2.5 6 µg/m³
35Good
5:00 AM
💨
PM2.5 5.8 µg/m³
32Good
6:00 AM
💨
PM2.5 5.7 µg/m³
28Good
7:00 AM
💨
PM2.5 5.8 µg/m³
28Good
Next few days
daily max · US EPA AQI
Sat
💨
Moderate · UV High
95
Sun
💨
Unhealthy for Sensitive Groups · UV High
124
Mon
💨
Unhealthy for Sensitive Groups · UV Very high
145
Tue
💨
Unhealthy for Sensitive Groups · UV Very high
131
Wed
💨
Good · UV Very high
39