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
9.2 µg/m³
WHO guideline 15
PM10
9.5 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
8:00 AM
💨
PM2.5 9.2 µg/m³
38Good
9:00 AM
💨
PM2.5 8.3 µg/m³
35Good
10:00 AM
💨
PM2.5 7.7 µg/m³
38Good
11:00 AM
💨
PM2.5 6.9 µg/m³
51Moderate
12:00 PM
💨
PM2.5 6.5 µg/m³
85Moderate
1:00 PM
💨
PM2.5 5.9 µg/m³
93Moderate
2:00 PM
💨
PM2.5 5.3 µg/m³
88Moderate
3:00 PM
💨
PM2.5 5.1 µg/m³
83Moderate
4:00 PM
💨
PM2.5 5.1 µg/m³
80Moderate
5:00 PM
💨
PM2.5 5.1 µg/m³
76Moderate
6:00 PM
💨
PM2.5 5.1 µg/m³
70Moderate
7:00 PM
💨
PM2.5 5.2 µg/m³
58Moderate
Next few days
daily max · US EPA AQI
Thu
💨
Moderate · UV High
93
Fri
💨
Moderate · UV High
66
Mon
💨
Good · UV Very high
36