What is the air quality in Alton today?

The current Air Quality Index (AQI) in Alton is 31 (Good). PM2.5 concentration is 7.49 µg/m³.

What is the temperature in Alton right now?

The current temperature in Alton is 14.6°C (feels like 14.6°C). Humidity is 78.3% and wind speed is 25.8 km/h.

Is it safe to go outside in Alton?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Alton, United States

Cloudy

14.6°C · 78.3% humidity

14.6°

Feels 14.6°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

25 10pm

31 1am

27 4am

26 7am

25 10am

25 1pm

25 4pm

27 7pm

Air Quality Index Trend

47h · 5 stn

View full history →

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.

78.3%

Humidity

25.8 km/h

Wind WNW

1014.0 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.49 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Alton?

Temperature & Precipitation

PM2.5 Trend

47h · 5 stations

PM2.57.49 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Both models agree Avg diff: 4.3°C

Where are air quality stations near Alton?

Jerseyvl, Illinois, USA

27.2 km PM2.5: 7.7 µg/m³

Jerseyvl, Illinois, USA

27.2 km PM2.5: 10.3 µg/m³

What cities are near Alton?

31 Upper Alton 27 Godfrey 38 Old Jamestown 38 Spanish Lake 34 Florissant 34 Ferguson 33 Hazelwood 43 Granite City 32 Edwardsville 28 Overland

Get AQI alerts for Alton

Notify me when air quality reaches:

ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-06-09T06:49 UTC.