Air quality in Seattle
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
8.3 µg/m³
WHO guideline 15
PM10
10.8 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
2:00 PM
💨
PM2.5 8.3 µg/m³
35Good
3:00 PM
💨
PM2.5 8.2 µg/m³
37Good
4:00 PM
💨
PM2.5 8.1 µg/m³
38Good
5:00 PM
💨
PM2.5 7.9 µg/m³
38Good
6:00 PM
💨
PM2.5 8.1 µg/m³
36Good
7:00 PM
💨
PM2.5 8.4 µg/m³
35Good
8:00 PM
💨
PM2.5 9.9 µg/m³
41Good
9:00 PM
💨
PM2.5 11.7 µg/m³
49Good
10:00 PM
💨
PM2.5 13 µg/m³
53Moderate
11:00 PM
💨
PM2.5 14.9 µg/m³
57Moderate
12:00 AM
💨
PM2.5 17.3 µg/m³
62Moderate
1:00 AM
💨
PM2.5 20.3 µg/m³
68Moderate
Next few days
daily max · US EPA AQI
Sun
💨
Moderate · UV Moderate
57
Mon
💨
Unhealthy for Sensitive Groups · UV Moderate
117
Tue
💨
Moderate · UV Moderate
91
Wed
💨
Unhealthy for Sensitive Groups · UV Low
101
Thu
💨
Moderate · UV Moderate
74