Stay updated with real-time air quality in SeaTac, Washington featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
25
Good
SeaTac, Washington
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.33 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
14.69 μg/m³
0
55
155
255
425
605+
27.17 ppb
0
55
71
86
201
201+
0.24 ppb
0
36
76
186
605
1005+
3.16 ppb
0
54
101
361
1250
2050+
0.14 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
SeaTac, Washington
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AQI 25
Good
3.33μg/m³
PM2.5
14.69μg/m³
PM10
27.17ppb
O3
0.24ppb
SO2
3.16ppb
NO2
0.14ppm
CO
AQI 24
Good
3.50μg/m³
PM2.5
16.00μg/m³
PM10
26.49ppb
O3
0.24ppb
SO2
3.10ppb
NO2
0.14ppm
CO
AQI 26
Good
3.12μg/m³
PM2.5
13.06μg/m³
PM10
28.09ppb
O3
0.24ppb
SO2
3.33ppb
NO2
0.14ppm
CO
AQI 26
Good
3.04μg/m³
PM2.5
13.38μg/m³
PM10
27.79ppb
O3
0.24ppb
SO2
3.27ppb
NO2
0.14ppm
CO
AQI 26
Good
3.17μg/m³
PM2.5
13.44μg/m³
PM10
27.68ppb
O3
0.24ppb
SO2
3.12ppb
NO2
0.14ppm
CO
AQI 26
Good
3.14μg/m³
PM2.5
13.14μg/m³
PM10
27.85ppb
O3
0.24ppb
SO2
3.18ppb
NO2
0.14ppm
CO
Air quality and pollutant data for Washington, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Seatac, Washington is updated every hour for accuracy.
In the past 24 hours, the air quality in Seatac, Washington was at its worst at 03:00:00 on 2026-03-05.
In the last 24 hours, the best air quality in Seatac, Washington was observed at 05:00:00 on 2026-03-05.
As of now, the AQI in Seatac, Washington is 25, indicating Good conditions.
Seatac, Washington air has the highest levels of O3.
Poor air quality in Seatac, Washington means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Seatac, Washington are currently 3.327 μg/m3.
The PM10 concentration in Seatac, Washington is 14.694 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Seatac, Washington is 0.141 ppm.
Currently, Seatac, Washington has a sulfur dioxide (SO2) concentration of 0.244 ppb.
The current ozone (O3) level in Seatac, Washington at the moment is 27.168 ppm.
Nitrogen dioxide (NO2) level in Seatac, Washington at the moment is 3.157 ppb.
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