Air Quality in Mercer Island, United States

Clear
22.3°C · 41.6% humidity
22.3°
Feels 22.3°
45
Good
Air quality is satisfactory. Enjoy outdoor activities.
23 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
51 10am
52
55
45 1pm
47
49
50 4pm
51
31
32 7pm
32
52
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
PM2.5
45
10.94 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

48h · 15 stations
PM2.510.94 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
10.94
Median
11.11
Average
8.4
Low
24.37
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +2.6
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°
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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 2026-07-21T20:06 UTC.