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
6.6 µg/m³
WHO guideline 15
PM10
6.7 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
12:00 AM
💨
PM2.5 6.6 µg/m³
31Good
1:00 AM
💨
PM2.5 5 µg/m³
31Good
2:00 AM
💨
PM2.5 4.3 µg/m³
32Good
3:00 AM
💨
PM2.5 3.8 µg/m³
31Good
4:00 AM
💨
PM2.5 3.4 µg/m³
30Good
5:00 AM
💨
PM2.5 3.2 µg/m³
30Good
6:00 AM
💨
PM2.5 3.1 µg/m³
30Good
7:00 AM
💨
PM2.5 3.2 µg/m³
30Good
8:00 AM
💨
PM2.5 4.2 µg/m³
31Good
9:00 AM
💨
PM2.5 4.4 µg/m³
35Good
10:00 AM
💨
PM2.5 3.5 µg/m³
40Good
11:00 AM
💨
PM2.5 2.7 µg/m³
44Good
Next few days
daily max · US EPA AQI
Fri
💨
Good · UV Moderate
45
Sat
💨
Good · UV Moderate
42
Sun
💨
Moderate · UV Moderate
51
Mon
💨
Moderate · UV High
61
Tue
💨
Moderate · UV High
58