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)
25
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)
1.71 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
5.51 μg/m³
0
55
155
255
425
605+
Ozone (O3)
27.25 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.22 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
7.84 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 25
Good
3.82μg/m³
PM2.5
14.54μg/m³
PM10
27.21ppb
O3
0.22ppb
SO2
7.80ppb
NO2
0.14ppm
CO
Bellevue, Washington
AQI 23
Good
3.83μg/m³
PM2.5
15.79μg/m³
PM10
25.38ppb
O3
0.23ppb
SO2
8.25ppb
NO2
0.15ppm
CO
White Center, Washington
AQI 25
Good
3.61μg/m³
PM2.5
15.27μg/m³
PM10
26.94ppb
O3
0.23ppb
SO2
9.31ppb
NO2
0.14ppm
CO
Kirkland, Washington
AQI 24
Good
3.54μg/m³
PM2.5
14.46μg/m³
PM10
26.12ppb
O3
0.24ppb
SO2
9.07ppb
NO2
0.15ppm
CO
Bainbridge Island, Washington
AQI 25
Good
3.02μg/m³
PM2.5
12.16μg/m³
PM10
27.44ppb
O3
0.27ppb
SO2
7.65ppb
NO2
0.15ppm
CO
Bryn MawrSkyway, Washington
AQI 24
Good
3.30μg/m³
PM2.5
13.17μg/m³
PM10
26.05ppb
O3
0.23ppb
SO2
7.80ppb
NO2
0.14ppm
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 01:00:00 on 2026-07-20.
When did Seattle, Washington have its best air quality in the last 24 hours?
The best air quality in Seattle, Washington was recorded at 03:00:00 on 2026-07-19.
What is the real-time air quality index for Seattle, Washington?
The real-time air quality index in Seattle, Washington is 25, currently categorized as Good.
Which pollutant is found most often in Seattle, Washington?
The most common pollutant in Seattle, Washington is O3.
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 1.707 μg/m3.
What are the current PM10 levels at Seattle, Washington?
The current PM10 levels in Seattle, Washington are 5.512 μg/m3.
What are the current carbon monoxide (CO) levels at Seattle, Washington?
The current carbon monoxide (CO) level in Seattle, Washington is 0.1 ppm.
What are the current sulfur dioxide (SO2) levels at Seattle, Washington?
The current sulfur dioxide (SO2) levels in Seattle, Washington are 0.222 ppb.
What are the current ozone (O3) levels at Seattle, Washington?
The current ozone (O3) levels at Seattle, Washington is 27.252 ppm.
What are the current nitrogen dioxide (NO2) levels at Seattle, Washington?
The current nitrogen dioxide (NO2) levels at Seattle, Washington is 7.845 ppb.
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