Air quality in Helena
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
10.1 µg/m³
WHO guideline 15
PM10
10.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
6:00 AM
💨
PM2.5 10.1 µg/m³
42Good
7:00 AM
💨
PM2.5 10 µg/m³
42Good
8:00 AM
💨
PM2.5 9.5 µg/m³
40Good
9:00 AM
💨
PM2.5 9.9 µg/m³
41Good
10:00 AM
💨
PM2.5 10.5 µg/m³
44Good
11:00 AM
💨
PM2.5 10.7 µg/m³
45Good
12:00 PM
💨
PM2.5 10.3 µg/m³
43Good
1:00 PM
💨
PM2.5 10.8 µg/m³
45Good
2:00 PM
💨
PM2.5 10.9 µg/m³
46Good
3:00 PM
💨
PM2.5 10.6 µg/m³
49Good
4:00 PM
💨
PM2.5 10.7 µg/m³
50Good
5:00 PM
💨
PM2.5 10.6 µg/m³
49Good
Next few days
daily max · US EPA AQI
Mon
💨
Moderate · UV High
64
Tue
💨
Moderate · UV Very high
81
Wed
💨
Moderate · UV Very high
74
Thu
💨
Moderate · UV Very high
73
Fri
💨
Good · UV Very high
40