Air Quality in Crystal Lake, United States
Windy
23.3°C · 72.8% humidity
23.3°
Feels 23.3°
38
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Crystal Lake's air quality — share it
AQI Forecast
24
2pm
24
24
38
5pm
34
31
30
8pm
29
28
27
11pm
26
28
55
2am
83
84
84
5am
83
83
54
8am
83
146
146
11am
146
146
Air Quality Index Trend
49h · 1 stnCrystal Lake's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
72.8%
Humidity
41.0 km/h
Wind ENE
1014.4 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
9.03 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Crystal Lake?
Temperature & Precipitation
PM2.5 Trend
49h · 1 stationPM2.59.03 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX5.9
High
What is the 7-day forecast for Crystal Lake?
07-21
27.5° 21.3°
0.81 mm
07-22
24.1° 16.5°
07-23
22.9° 16.2°
3.0 mm
07-24
26.8° 14.9°
07-25
22.7° 17.0°
0.44 mm
07-26
25.7° 20.1°
2.81 mm
07-27
24.7° 19.2°
3.56 mm
Both models agree
Avg diff: 4.0°C
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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 2026-07-21T22:59 UTC.