Air quality in Princeton
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
5.3 µg/m³
WHO guideline 15
PM10
5.5 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
4:00 PM
💨
PM2.5 5.3 µg/m³
45Good
5:00 PM
💨
PM2.5 5.3 µg/m³
44Good
6:00 PM
💨
PM2.5 5.3 µg/m³
42Good
7:00 PM
💨
PM2.5 5.3 µg/m³
38Good
8:00 PM
💨
PM2.5 5.6 µg/m³
35Good
9:00 PM
💨
PM2.5 6.6 µg/m³
32Good
10:00 PM
💨
PM2.5 7.6 µg/m³
32Good
11:00 PM
💨
PM2.5 8.4 µg/m³
35Good
12:00 AM
💨
PM2.5 9.1 µg/m³
38Good
1:00 AM
💨
PM2.5 9.4 µg/m³
39Good
2:00 AM
💨
PM2.5 9.3 µg/m³
39Good
3:00 AM
💨
PM2.5 9.3 µg/m³
39Good
Next few days
daily max · US EPA AQI
Mon
💨
Good · UV Very high
44
Tue
💨
Moderate · UV Very high
53
Wed
💨
Moderate · UV Very high
65
Thu
💨
Good · UV Very high
44