Air Quality in Mercer Island, United States

Partly Cloudy
20.7°C · 55.4% humidity
20.7°
Feels 20.7°
19
Good
Air quality is satisfactory. Enjoy outdoor activities.
23 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
28 9am
23
20
19 12pm
16
7
6 3pm
5
4
1 6pm
3
10
9 9pm
9
9
9 12am
9
9
9 3am
29
29
41 6am
41
41
Station readings
28
23
20
20
CAMS model adj -25
54
54
34
34
34
27
27
27
27
25
27
34
34
34
34
34
34
34
34
54
54
66
66
66
AD 728×90

Air Quality Index Trend

48h · 17 stn

Mercer Island's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

55.4%
Humidity
35.8 km/h
Wind NNW
1019.1 hPa
Pressure
10.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
19
4.59 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Mercer Island?

Temperature & Precipitation

PM2.5 Trend

48h · 17 stations
PM2.54.59 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX10.9
Extreme
AD 300×250
Station readings (23 stations within 25 km)
4.59
Median
4.8
Average
0.1
Low
13.26
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +2.8

What is the 7-day forecast for Mercer Island?

09-05
24.3° 9.4°
09-06
23.1° 11.7°
09-07
20.6° 10.4°
1.13 mm
09-08
26.7° 10.1°
0.75 mm
09-09
26.5° 12.3°
0.19 mm
09-10
27.3° 11.6°
09-11
23.4° 8.8°
Both models agree Avg diff: 3.7°C

Where are air quality stations near Mercer Island?

14
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.4 µg/m³
15
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.6 µg/m³
15
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.6 µg/m³
15
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.6 µg/m³
20
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 4.8 µg/m³
35
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 8.4 µg/m³
9
Seattle-S Myrtle St
6.5 km PM2.5: 2.2 µg/m³
14
Seattle-16th Ave S
6.8 km PM2.5: 3.4 µg/m³
10
Seattle-13th Ave S
7.7 km PM2.5: 2.4 µg/m³
25
10th and Weller, Seattle, Washington, USA
7.9 km PM2.5: 6.0 µg/m³

What cities are near Mercer Island?

20 Columbia City 19 Bryn Mawr-Skyway 16 West Lake Sammamish 23 Seattle 19 Renton 20 Tukwila 22 Kirkland 18 Sammamish 20 Redmond 17 City of Sammamish
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T19:46 UTC.