Air quality in Williston
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
34.3 µg/m³
WHO guideline 15
PM10
34.5 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
12:00 AM
💨
PM2.5 34.3 µg/m³
98Moderate
1:00 AM
💨
PM2.5 41.1 µg/m³
115Unhealthy for Sensitive Groups
2:00 AM
💨
PM2.5 46.2 µg/m³
127Unhealthy for Sensitive Groups
3:00 AM
💨
PM2.5 51 µg/m³
139Unhealthy for Sensitive Groups
4:00 AM
💨
PM2.5 56.3 µg/m³
151Unhealthy
5:00 AM
💨
PM2.5 62.4 µg/m³
155Unhealthy
6:00 AM
💨
PM2.5 67.3 µg/m³
157Unhealthy
7:00 AM
💨
PM2.5 69.4 µg/m³
158Unhealthy
8:00 AM
💨
PM2.5 71 µg/m³
159Unhealthy
9:00 AM
💨
PM2.5 63.1 µg/m³
155Unhealthy
10:00 AM
💨
PM2.5 34.5 µg/m³
98Moderate
11:00 AM
💨
PM2.5 16.1 µg/m³
59Moderate
Next few days
daily max · US EPA AQI
Thu
💨
Unhealthy for Sensitive Groups · UV Moderate
119
Fri
💨
Unhealthy · UV High
159
Sat
💨
Moderate · UV High
78