Air quality in Harvard
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
2.2 µg/m³
WHO guideline 15
PM10
2.3 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
8:00 PM
💨
PM2.5 2.2 µg/m³
26Good
9:00 PM
💨
PM2.5 2 µg/m³
26Good
10:00 PM
💨
PM2.5 2.1 µg/m³
24Good
11:00 PM
💨
PM2.5 2.2 µg/m³
22Good
12:00 AM
💨
PM2.5 2.2 µg/m³
20Good
1:00 AM
💨
PM2.5 2.4 µg/m³
19Good
2:00 AM
💨
PM2.5 2.8 µg/m³
17Good
3:00 AM
💨
PM2.5 3.3 µg/m³
17Good
4:00 AM
💨
PM2.5 3.7 µg/m³
16Good
5:00 AM
💨
PM2.5 4.1 µg/m³
17Good
6:00 AM
💨
PM2.5 4.5 µg/m³
19Good
7:00 AM
💨
PM2.5 5.1 µg/m³
21Good
Next few days
daily max · US EPA AQI
Tue
💨
Good · UV Moderate
44
Thu
💨
Moderate · UV High
62
Fri
💨
Moderate · UV High
66