Air Quality in Alton, United States

Rain
18.6°C · 92.9% humidity
18.6°
Feels 18.6°
35
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model

Nearby Monitoring Stations

AQI Forecast
27 7am
34
34
35 10am
20
24
27 1pm
29
30
31 4pm
32
33
33 7pm
33
34
34 10pm
34
34
27 1am
27
27
27 4am
27
34
AD 728×90

Air Quality Index Trend

45h · 5 stn

Alton's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

92.9%
Humidity
39.4 km/h
Wind ENE
1019.1 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
35
8.52 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Alton?

Temperature & Precipitation

PM2.5 Trend

45h · 5 stations
PM2.58.52 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Both models agree Avg diff: 7.2°C

Where are air quality stations near Alton?

31
Jerseyvl, Illinois, USA
27.2 km PM2.5: 7.4 µg/m³
37
Jerseyvl, Illinois, USA
27.2 km PM2.5: 8.9 µg/m³

What cities are near Alton?

35 Upper Alton 37 Godfrey 39 Old Jamestown 38 Spanish Lake 40 Florissant 40 Ferguson 42 Hazelwood 36 Granite City 38 Edwardsville 46 Overland
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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 2026-09-05T15:48 UTC.