Air Quality in Mercer Island, United States

Clear
22.3°C · 41.6% humidity
22.3°
Feels 22.3°
50
Good
Air quality is satisfactory. Enjoy outdoor activities.
20 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
51 10am
52
55
50 1pm
53
53
53 4pm
53
33
33 7pm
33
53
53 10pm
53
53
53 1am
53
33
33 4am
26
53
53 7am
53
53
Station readings
51
52
55
54
CAMS model adj -1
54
54
54
54
54
54
54
54
34
34
34
54
54
54
54
54
54
34
34
27
54
54
54
54
AD 728×90

Air Quality Index Trend

48h · 15 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.

41.6%
Humidity
8.0 km/h
Wind NNE
1015.5 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
50
12.0 µg/m³
PM10
31
34.3 µg/m³
050100150200300500

What is the weather forecast for Mercer Island?

Temperature & Precipitation

PM2.5 Trend

48h · 15 stations
PM2.512.0 µg/m³ ✓ WHO
Good
PM1034.3 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (20 stations within 25 km)
12.0
Median
11.76
Average
7.95
Low
30.35
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +1.5

What is the 7-day forecast for Mercer Island?

07-21
28.8° 10.2°
07-22
25.0° 11.1°
07-23
29.5° 12.6°
07-24
28.5° 10.8°
07-25
25.4° 10.5°
07-26
29.5° 9.2°
07-27
26.4° 11.9°
Both models agree Avg diff: 4.5°C

Where are air quality stations near Mercer Island?

35
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 8.4 µg/m³
47
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 11.3 µg/m³
35
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 8.4 µg/m³
84
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 27.8 µg/m³
21
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 5.0 µg/m³
40
Seattle-S Myrtle St
6.5 km PM2.5: 9.7 µg/m³
31
Seattle-16th Ave S
6.8 km PM2.5: 7.5 µg/m³
39
Seattle-13th Ave S
7.7 km PM2.5: 9.4 µg/m³
50
10th and Weller, Seattle, Washington, USA
7.9 km PM2.5: 12.0 µg/m³
68
10th and Weller, Seattle, Washington, USA
7.9 km PM2.5: 20.2 µg/m³

What cities are near Mercer Island?

50 Columbia City 51 Bryn Mawr-Skyway 50 West Lake Sammamish 49 Seattle 51 Renton 49 Tukwila 48 Kirkland 50 Sammamish 49 Redmond 51 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 2026-07-21T20:31 UTC.