Air quality in Smithtown
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.
US AQI · EPA
142
Unhealthy for Sensitive Groups
PM2.5
18.1 µg/m³
WHO guideline 15
PM10
19.3 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
1:00 PM
💨
PM2.5 18.1 µg/m³
142Unhealthy for Sensitive Groups
2:00 PM
💨
PM2.5 17.2 µg/m³
165Unhealthy
3:00 PM
💨
PM2.5 15.9 µg/m³
165Unhealthy
4:00 PM
💨
PM2.5 16.6 µg/m³
150Unhealthy for Sensitive Groups
5:00 PM
💨
PM2.5 17.5 µg/m³
129Unhealthy for Sensitive Groups
6:00 PM
💨
PM2.5 17.5 µg/m³
101Unhealthy for Sensitive Groups
7:00 PM
💨
PM2.5 16.3 µg/m³
71Moderate
8:00 PM
💨
PM2.5 11.3 µg/m³
49Good
9:00 PM
💨
PM2.5 6.1 µg/m³
43Good
10:00 PM
💨
PM2.5 3.3 µg/m³
38Good
11:00 PM
💨
PM2.5 1.5 µg/m³
35Good
12:00 AM
💨
PM2.5 1.3 µg/m³
34Good
Next few days
daily max · US EPA AQI
Tue
💨
Unhealthy · UV High
165
Fri
💨
Moderate · UV High
80