Air quality in Holliston
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
5.4 µg/m³
WHO guideline 15
PM10
5.6 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
7:00 PM
💨
PM2.5 5.4 µg/m³
38Good
8:00 PM
💨
PM2.5 7.5 µg/m³
32Good
9:00 PM
💨
PM2.5 9.1 µg/m³
38Good
10:00 PM
💨
PM2.5 9.7 µg/m³
40Good
11:00 PM
💨
PM2.5 9.3 µg/m³
39Good
12:00 AM
💨
PM2.5 8.9 µg/m³
37Good
1:00 AM
💨
PM2.5 8 µg/m³
33Good
2:00 AM
💨
PM2.5 6.2 µg/m³
26Good
3:00 AM
💨
PM2.5 5.1 µg/m³
27Good
4:00 AM
💨
PM2.5 4.7 µg/m³
28Good
5:00 AM
💨
PM2.5 4.6 µg/m³
29Good
6:00 AM
💨
PM2.5 4.6 µg/m³
29Good
Next few days
daily max · US EPA AQI
Thu
💨
Moderate · UV High
65
Fri
💨
Good · UV Moderate
45
Sat
💨
Good · UV Moderate
37
Sun
💨
Good · UV Moderate
38