Air Quality in Alton, United States
Partly Cloudy
29.6°C · 55.7% humidity
29.6°
Feels 33.2°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Alton's air quality — share it
AQI Forecast
25
8am
25
25
26
11am
25
25
25
2pm
25
25
25
5pm
25
25
27
8pm
27
27
27
11pm
27
27
27
2am
25
25
25
5am
25
25
Air Quality Index Trend
46h · 4 stnAlton'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 Alton is 1.2× the WHO annual guideline of 5 µg/m³.
55.7%
Humidity
25.9 km/h
Wind NNW
1020.3 hPa
Pressure
14.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
6.23 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Alton?
Temperature & Precipitation
PM2.5 Trend
46h · 4 stationsPM2.56.23 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX14.9
Extreme
What is the 7-day forecast for Alton?
05-29
29.6° 8.5°
0.25 mm
05-30
27.5° 18.5°
3.56 mm
05-31
30.6° 12.2°
06-01
30.0° 17.4°
06-02
25.5° 13.9°
0.06 mm
06-03
29.2° 24.3°
0.13 mm
06-04
28.5° 18.8°
6.44 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 2026-05-29T16:10 UTC.