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
6.7 µg/m³
WHO guideline 15
PM10
7.6 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
4:00 AM
💨
PM2.5 6.7 µg/m³
28 Good
5:00 AM
💨
PM2.5 6.9 µg/m³
29 Good
6:00 AM
💨
PM2.5 7.1 µg/m³
30 Good
7:00 AM
💨
PM2.5 7.4 µg/m³
31 Good
8:00 AM
💨
PM2.5 7.9 µg/m³
33 Good
9:00 AM
💨
PM2.5 8 µg/m³
33 Good
10:00 AM
💨
PM2.5 8.2 µg/m³
34 Good
11:00 AM
💨
PM2.5 6.9 µg/m³
34 Good
12:00 PM
💨
PM2.5 5.8 µg/m³
37 Good
1:00 PM
💨
PM2.5 5.2 µg/m³
39 Good
2:00 PM
💨
PM2.5 5.1 µg/m³
39 Good
3:00 PM
💨
PM2.5 4.1 µg/m³
38 Good
Next few days daily max · US EPA AQI
Mon
💨
Moderate · UV Low
56
JavaScript is needed for the map — the city links below work without it.
Precip NEXRAD · NOAA Temp Wind Clouds Terrain