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
16 µg/m³
WHO guideline 15
PM10
16.8 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
2:00 PM
💨
PM2.5 16 µg/m³
59Moderate
3:00 PM
💨
PM2.5 17.2 µg/m³
62Moderate
4:00 PM
💨
PM2.5 18 µg/m³
76Moderate
5:00 PM
💨
PM2.5 18.5 µg/m³
85Moderate
6:00 PM
💨
PM2.5 18.7 µg/m³
81Moderate
7:00 PM
💨
PM2.5 19.3 µg/m³
68Moderate
8:00 PM
💨
PM2.5 21.2 µg/m³
70Moderate
9:00 PM
💨
PM2.5 24 µg/m³
76Moderate
10:00 PM
💨
PM2.5 26 µg/m³
80Moderate
11:00 PM
💨
PM2.5 27.6 µg/m³
84Moderate
12:00 AM
💨
PM2.5 29.3 µg/m³
87Moderate
1:00 AM
💨
PM2.5 31 µg/m³
91Moderate
Next few days
daily max · US EPA AQI
Thu
💨
Moderate · UV Moderate
87
Fri
💨
Moderate · UV Moderate
100
Sat
💨
Moderate · UV Moderate
76
Sun
💨
Moderate · UV High
88
Mon
💨
Moderate · UV High
93