Air Quality in Decatur, United States
Windy
25.5°C · 74.7% humidity
25.5°
Feels 25.5°
35
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Decatur's air quality — share it
AQI Forecast
34
3pm
34
34
35
6pm
34
34
54
9pm
34
34
34
12am
34
34
34
3am
34
34
34
6am
34
54
54
9am
54
54
54
12pm
34
34
Air Quality Index Trend
34h · 2 stnDecatur's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
74.7%
Humidity
47.0 km/h
Wind E
1010.5 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
8.4 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Decatur?
Temperature & Precipitation
PM2.5 Trend
34h · 2 stationsPM2.58.4 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX4.4
Moderate
Station readings (1 station within 25 km)
8.4
Median
8.4
Average
8.4
Low
8.4
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -1.3
What is the 7-day forecast for Decatur?
07-21
31.6° 21.1°
4.06 mm
07-22
28.9° 21.4°
0.06 mm
07-23
29.8° 19.4°
0.81 mm
07-24
27.4° 19.9°
0.44 mm
07-25
27.1° 20.1°
4.44 mm
07-26
30.9° 21.0°
2.12 mm
07-27
27.2° 20.2°
7.06 mm
Both models agree
Avg diff: 4.3°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 2026-07-21T23:11 UTC.