What is the air quality in Alton today?

The current Air Quality Index (AQI) in Alton is 31 (Good). PM2.5 concentration is 7.41 µg/m³.

What is the temperature in Alton right now?

The current temperature in Alton is 10.5°C (feels like 10.5°C). Humidity is 59.8% and wind speed is 104.9 km/h.

Is it safe to go outside in Alton?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Alton, United States

Windy

10.5°C · 59.8% humidity

10.5°

Feels 10.5°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

43h · 3 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.

59.8%

Humidity

104.9 km/h

Wind NNE

1026.2 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.41 µg/m³

PM10

27.4 µg/m³

050100150200300500

What is the weather forecast for Alton?

Temperature & Precipitation

PM2.5 Trend

43h · 3 stations

PM2.57.41 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Alton?

10-20

12.8° 2.0°

0.06 mm

10-21

24.4° 12.8°

5.69 mm

10-22

21.5° 9.1°

2.63 mm

10-23

12.3° 7.5°

10.19 mm

10-24

25.9° 10.4°

10-25

16.5° 2.3°

10-26

24.9° 5.4°

0.19 mm

Both models agree Avg diff: 4.8°C

Where are air quality stations near Alton?

Jerseyvl, Illinois, USA

27.2 km PM2.5: 10.1 µg/m³

Jerseyvl, Illinois, USA

27.2 km PM2.5: 10.8 µg/m³

Jerseyvl, Illinois, USA

27.2 km PM2.5: 10.1 µg/m³

What cities are near Alton?

30 Upper Alton 43 Godfrey 27 Old Jamestown 32 Spanish Lake 33 Florissant 32 Ferguson 27 Hazelwood 31 Granite City 35 Edwardsville 33 Overland

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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 2026-10-20T20:57 UTC.