Real-time air quality index in Seattle, Washington today
Stay updated with real-time air quality in Seattle, 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)
44
Good
Seattle, Washington
Last updated: ... (Local time)
Common air pollutants in Seattle, Washington
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
7.57 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
31.45 μg/m³
0
55
155
255
425
605+
Ozone (O3)
16.78 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.20 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
5.27 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.10 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Seattle, Washington
Seattle, Washington
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Seattle, Washington air quality map: Real-time AQI near you
Air quality in nearby cities
Mercer Island, Washington
AQI 27
Good
5.27μg/m³
PM2.5
20.23μg/m³
PM10
20.86ppb
O3
0.28ppb
SO2
3.36ppb
NO2
0.10ppm
CO
Bellevue, Washington
AQI 27
Good
5.22μg/m³
PM2.5
21.14μg/m³
PM10
19.69ppb
O3
0.28ppb
SO2
3.36ppb
NO2
0.10ppm
CO
White Center, Washington
AQI 27
Good
4.55μg/m³
PM2.5
18.39μg/m³
PM10
20.74ppb
O3
0.28ppb
SO2
3.45ppb
NO2
0.10ppm
CO
Kirkland, Washington
AQI 27
Good
5.34μg/m³
PM2.5
21.16μg/m³
PM10
19.43ppb
O3
0.28ppb
SO2
3.37ppb
NO2
0.11ppm
CO
Bainbridge Island, Washington
AQI 27
Good
5.33μg/m³
PM2.5
21.71μg/m³
PM10
20.54ppb
O3
0.28ppb
SO2
4.24ppb
NO2
0.11ppm
CO
Bryn MawrSkyway, Washington
AQI 22
Good
4.09μg/m³
PM2.5
16.80μg/m³
PM10
21.32ppb
O3
0.28ppb
SO2
3.77ppb
NO2
0.10ppm
CO
How accurate is Washington, USA air quality data?
Air quality measurements for Washington, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Frequently asked questions
How frequently is the air quality data for Seattle, Washington updated?
Air quality data for Seattle, Washington is updated on an hourly basis.
When did Seattle, Washington experience the worst air quality in the last 24 hours?
The worst air quality in Seattle, Washington was recorded at 03:00:00 on 2025-07-22.
When did Seattle, Washington have its best air quality in the last 24 hours?
The best air quality in Seattle, Washington was recorded at 09:00:00 on 2025-07-22.
What is the real-time air quality index for Seattle, Washington?
The real-time air quality index in Seattle, Washington is 44, currently categorized as Good.
Which pollutant is found most often in Seattle, Washington?
The most common pollutant in Seattle, Washington is PM2.5.
What can I do if the air quality in Seattle, Washington is poor?
If the air quality in Seattle, Washington is poor, limit outdoor activities and use a mask to safeguard your health.
What are the current PM2.5 levels in Seattle, Washington?
The measured PM2.5 levels in Seattle, Washington at present are 8.331 μg/m3.
What are the current PM10 levels at Seattle, Washington?
The current PM10 levels in Seattle, Washington are 35.661 μg/m3.
What are the current carbon monoxide (CO) levels at Seattle, Washington?
The current carbon monoxide (CO) level in Seattle, Washington is 0.103 ppm.
What are the current sulfur dioxide (SO2) levels at Seattle, Washington?
The current sulfur dioxide (SO2) levels in Seattle, Washington are 0.297 ppb.
What are the current ozone (O3) levels at Seattle, Washington?
The current ozone (O3) levels at Seattle, Washington is 19.911 ppm.
What are the current nitrogen dioxide (NO2) levels at Seattle, Washington?
The current nitrogen dioxide (NO2) levels at Seattle, Washington is 2.466 ppb.
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