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
4.5 µg/m³
WHO guideline 15
PM10
5.6 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
5:00 PM
💨
PM2.5 4.5 µg/m³
39Good
6:00 PM
💨
PM2.5 4.3 µg/m³
36Good
7:00 PM
💨
PM2.5 4.4 µg/m³
32Good
8:00 PM
💨
PM2.5 4.8 µg/m³
27Good
9:00 PM
💨
PM2.5 5.1 µg/m³
23Good
10:00 PM
💨
PM2.5 5 µg/m³
21Good
11:00 PM
💨
PM2.5 5 µg/m³
21Good
12:00 AM
💨
PM2.5 5.3 µg/m³
22Good
1:00 AM
💨
PM2.5 5.7 µg/m³
24Good
2:00 AM
💨
PM2.5 5.9 µg/m³
25Good
3:00 AM
💨
PM2.5 6.1 µg/m³
25Good
4:00 AM
💨
PM2.5 6.7 µg/m³
28Good
Next few days
daily max · US EPA AQI
Sat
💨
Good · UV Moderate
42
Wed
💨
Good · UV Moderate
17