Air Quality in Mercer Island, United States

Cloudy
15.0°C · 70.0% humidity
15.0°
Feels 15.0°
72
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
22 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
63 1pm
70
66
72 4pm
69
68
66 7pm
65
65
64 10pm
64
64
63 1am
63
63
63 4am
63
63
63 7am
43
43
43 10am
43
43
Station readings
63
70
66
CAMS model adj +9
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
34
34
34
34
34
AD 728×90

Air Quality Index Trend

47h · 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. Current PM2.5 concentration in Mercer Island is 1.5× the WHO 24-hour guideline of 15 µg/m³.

70.0%
Humidity
32.8 km/h
Wind S
1017.1 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
72
21.86 µg/m³
PM10
31
34.3 µg/m³
050100150200300500

What is the weather forecast for Mercer Island?

Temperature & Precipitation

PM2.5 Trend

47h · 17 stations
PM2.521.86 µg/m³ ×1.5 WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX12.9
Extreme
AD 300×250
Station readings (22 stations within 25 km)
21.86
Median
20.14
Average
0.84
Low
51.3
High
PM2.5 µg/m³ · Model: 13.5 · Bias: -8.4

What is the 7-day forecast for Mercer Island?

08-03
29.5° 9.3°
0.06 mm
08-04
25.0° 10.5°
0.06 mm
08-05
29.3° 10.6°
08-06
25.1° 13.6°
0.31 mm
08-07
27.3° 12.2°
08-08
24.8° 9.2°
0.06 mm
08-09
23.7° 8.9°
Both models agree Avg diff: 4.6°C

Where are air quality stations near Mercer Island?

57
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 15.0 µg/m³
64
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 18.3 µg/m³
67
SE 12th St, Bellevue, Washington, USA
6.5 km PM2.5: 19.7 µg/m³
61
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 16.9 µg/m³
62
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 17.3 µg/m³
66
Beacon Hill, Seattle, Washington, USA
6.5 km PM2.5: 19.2 µg/m³
66
Seattle-S Myrtle St
6.5 km PM2.5: 19.4 µg/m³
61
Seattle-16th Ave S
6.8 km PM2.5: 17.0 µg/m³
69
Seattle-13th Ave S
7.7 km PM2.5: 20.5 µg/m³
62
10th and Weller, Seattle, Washington, USA
7.9 km PM2.5: 17.3 µg/m³

What cities are near Mercer Island?

65 Columbia City 67 Bryn Mawr-Skyway 83 West Lake Sammamish 62 Seattle 68 Renton 64 Tukwila 71 Kirkland 81 Sammamish 77 Redmond 79 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 2026-08-07T23:08 UTC.