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
8.3 µg/m³
WHO guideline 15
PM10
8.5 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
9:00 AM
💨
PM2.5 8.3 µg/m³
37Good
10:00 AM
💨
PM2.5 10.2 µg/m³
48Good
11:00 AM
💨
PM2.5 13 µg/m³
81Moderate
12:00 PM
💨
PM2.5 15 µg/m³
106Unhealthy for Sensitive Groups
1:00 PM
💨
PM2.5 15.8 µg/m³
129Unhealthy for Sensitive Groups
2:00 PM
💨
PM2.5 16.2 µg/m³
145Unhealthy for Sensitive Groups
3:00 PM
💨
PM2.5 16.9 µg/m³
152Unhealthy
4:00 PM
💨
PM2.5 18.1 µg/m³
150Unhealthy for Sensitive Groups
5:00 PM
💨
PM2.5 19.1 µg/m³
140Unhealthy for Sensitive Groups
6:00 PM
💨
PM2.5 19.7 µg/m³
117Unhealthy for Sensitive Groups
7:00 PM
💨
PM2.5 21.2 µg/m³
93Moderate
8:00 PM
💨
PM2.5 24.7 µg/m³
77Moderate
Next few days
daily max · US EPA AQI
Fri
💨
Unhealthy · UV High
152
Sat
💨
Moderate · UV High
89
Sun
💨
Moderate · UV High
75
Mon
💨
Moderate · UV High
80