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
9.5 µg/m³
WHO guideline 15
PM10
11.4 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
7:00 AM
💨
PM2.5 9.5 µg/m³
40Good
8:00 AM
💨
PM2.5 9.6 µg/m³
40Good
9:00 AM
💨
PM2.5 11 µg/m³
46Good
10:00 AM
💨
PM2.5 11.9 µg/m³
50Good
11:00 AM
💨
PM2.5 11.1 µg/m³
73Moderate
12:00 PM
💨
PM2.5 9.5 µg/m³
78Moderate
1:00 PM
💨
PM2.5 8.8 µg/m³
75Moderate
2:00 PM
💨
PM2.5 8.8 µg/m³
70Moderate
3:00 PM
💨
PM2.5 8.6 µg/m³
65Moderate
4:00 PM
💨
PM2.5 8.4 µg/m³
60Moderate
5:00 PM
💨
PM2.5 8.2 µg/m³
51Moderate
6:00 PM
💨
PM2.5 8.4 µg/m³
48Good
Next few days
daily max · US EPA AQI
Thu
💨
Moderate · UV High
78
Fri
💨
Moderate · UV High
60
Sat
💨
Moderate · UV Moderate
51
Sun
💨
Moderate · UV High
56
Mon
💨
Moderate · UV Moderate
53