Air Quality in Mercer Island, United States
Partly Cloudy
20.7°C · 55.4% humidity
20.7°
Feels 20.7°
20
Good
Air quality is satisfactory. Enjoy outdoor activities.
26 stations
Nearby Monitoring Stations
AQI Forecast
Calibrated
14
5am
14
18
20
8am
16
16
0
11am
0
0
0
2pm
0
0
0
5pm
0
0
0
8pm
0
0
0
11pm
0
0
0
2am
0
16
Station readings
14
14
18
18
CAMS model
adj -38
54
54
54
54
54
54
34
34
34
27
27
27
27
25
27
34
34
34
34
34
34
34
34
54
Air Quality Index Trend
48h · 16 stnMercer 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
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.66 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Mercer Island?
Temperature & Precipitation
PM2.5 Trend
48h · 16 stationsPM2.54.66 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX1.4
Low
Station readings (26 stations within 25 km)
4.66
Median
4.65
Average
0.1
Low
7.75
High
PM2.5 µg/m³ · Model: 10.0 · Bias: +5.3
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?
15
SE 12th St, Bellevue, Washington, USA
14
SE 12th St, Bellevue, Washington, USA
14
SE 12th St, Bellevue, Washington, USA
5
Beacon Hill, Seattle, Washington, USA
11
Beacon Hill, Seattle, Washington, USA
20
Beacon Hill, Seattle, Washington, USA
21
Seattle-S Myrtle St
17
Seattle-16th Ave S
29
Seattle-13th Ave S
26
10th and Weller, Seattle, Washington, USA
What cities are near Mercer Island?
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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 2026-09-05T15:52 UTC.