Air quality in Old Greenwich
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
5.1 µg/m³
WHO guideline 15
PM10
5.3 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
7:00 AM
💨
PM2.5 5.1 µg/m³
21Good
8:00 AM
💨
PM2.5 6 µg/m³
25Good
9:00 AM
💨
PM2.5 6.4 µg/m³
27Good
10:00 AM
💨
PM2.5 6.7 µg/m³
32Good
11:00 AM
💨
PM2.5 6.2 µg/m³
38Good
12:00 PM
💨
PM2.5 5.9 µg/m³
41Good
1:00 PM
💨
PM2.5 5.7 µg/m³
43Good
2:00 PM
💨
PM2.5 5.6 µg/m³
43Good
3:00 PM
💨
PM2.5 5.4 µg/m³
45Good
4:00 PM
💨
PM2.5 5.4 µg/m³
46Good
5:00 PM
💨
PM2.5 5.4 µg/m³
44Good
6:00 PM
💨
PM2.5 5.5 µg/m³
39Good
Next few days
daily max · US EPA AQI
Sat
💨
Moderate · UV High
68
Sun
💨
Unhealthy for Sensitive Groups · UV High
138
Mon
💨
Moderate · UV High
85
Tue
💨
Unhealthy · UV Low
154
Wed
💨
Moderate · UV Moderate
75