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)
27
Good
SeaTac, Washington
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.65 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
19.59 μg/m³
0
55
155
255
425
605+
19.05 ppb
0
55
71
86
201
201+
0.47 ppb
0
36
76
186
605
1005+
4.92 ppb
0
54
101
361
1250
2050+
0.11 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
SeaTac, Washington
SeaTac, Washington
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AQI 27
Good
4.65μg/m³
PM2.5
19.59μg/m³
PM10
19.05ppb
O3
0.47ppb
SO2
4.92ppb
NO2
0.11ppm
CO
AQI 27
Good
4.90μg/m³
PM2.5
21.00μg/m³
PM10
19.06ppb
O3
0.48ppb
SO2
4.78ppb
NO2
0.11ppm
CO
AQI 22
Good
4.41μg/m³
PM2.5
17.03μg/m³
PM10
19.63ppb
O3
0.48ppb
SO2
4.42ppb
NO2
0.11ppm
CO
AQI 27
Good
4.99μg/m³
PM2.5
21.62μg/m³
PM10
18.61ppb
O3
0.47ppb
SO2
5.85ppb
NO2
0.11ppm
CO
AQI 22
Good
3.94μg/m³
PM2.5
16.65μg/m³
PM10
19.41ppb
O3
0.48ppb
SO2
4.96ppb
NO2
0.11ppm
CO
AQI 22
Good
4.26μg/m³
PM2.5
17.92μg/m³
PM10
19.32ppb
O3
0.48ppb
SO2
5.21ppb
NO2
0.11ppm
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 2026-09-07.
In the last 24 hours, the best air quality in Seatac, Washington was observed at 10:00:00 on 2026-09-07.
As of now, the AQI in Seatac, Washington is 27, indicating Good conditions.
Seatac, Washington air has the highest levels of PM2.5.
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 4.647 μg/m3.
The PM10 concentration in Seatac, Washington is 19.593 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Seatac, Washington is 0.109 ppm.
Currently, Seatac, Washington has a sulfur dioxide (SO2) concentration of 0.475 ppb.
The current ozone (O3) level in Seatac, Washington at the moment is 19.051 ppm.
Nitrogen dioxide (NO2) level in Seatac, Washington at the moment is 4.92 ppb.
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