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
AD 728×90

Air Quality Index Trend

48h · 16 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
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
20
4.66 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Mercer Island?

Temperature & Precipitation

PM2.5 Trend

48h · 16 stations
PM2.54.66 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
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
6.5 km PM2.5: 3.6 µg/m³
14
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.4 µg/m³
14
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 3.4 µg/m³
5
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 1.2 µg/m³
11
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 2.6 µg/m³
20
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 4.8 µg/m³
21
Seattle-S Myrtle St
6.5 km PM2.5: 5.0 µg/m³
17
Seattle-16th Ave S
6.8 km PM2.5: 4.0 µg/m³
29
Seattle-13th Ave S
7.7 km PM2.5: 7.0 µg/m³
26
10th and Weller, Seattle, Washington, USA
7.9 km PM2.5: 6.2 µg/m³

What cities are near Mercer Island?

20 Columbia City 20 Bryn Mawr-Skyway 18 West Lake Sammamish 20 Seattle 20 Renton 20 Tukwila 20 Kirkland 18 Sammamish 19 Redmond 19 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 2026-09-05T15:52 UTC.