Stay updated with real-time air quality in Decatur, Indiana featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
49
Good
Decatur, Indiana
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
8.68 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.49 μg/m³
0
55
155
255
425
605+
32.67 ppb
0
55
71
86
201
201+
1.27 ppb
0
36
76
186
605
1005+
5.31 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Decatur, Indiana
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AQI 44
Good
8.38μg/m³
PM2.5
26.69μg/m³
PM10
33.33ppb
O3
1.26ppb
SO2
5.18ppb
NO2
0.20ppm
CO
AQI 54
Moderate
10.52μg/m³
PM2.5
43.96μg/m³
PM10
32.69ppb
O3
1.18ppb
SO2
5.32ppb
NO2
0.19ppm
CO
AQI 49
Good
9.00μg/m³
PM2.5
39.26μg/m³
PM10
30.98ppb
O3
1.29ppb
SO2
5.45ppb
NO2
0.21ppm
CO
AQI 54
Moderate
10.52μg/m³
PM2.5
45.32μg/m³
PM10
32.38ppb
O3
1.20ppb
SO2
5.30ppb
NO2
0.19ppm
CO
AQI 35
Good
4.38μg/m³
PM2.5
16.69μg/m³
PM10
38.24ppb
O3
1.24ppb
SO2
3.54ppb
NO2
0.14ppm
CO
AQI 44
Good
7.68μg/m³
PM2.5
22.88μg/m³
PM10
32.85ppb
O3
1.23ppb
SO2
4.21ppb
NO2
0.20ppm
CO
The air quality data for Indiana, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Decatur, Indiana are available every hour.
Decatur, Indiana experienced its worst air quality at 03:00:00, 2026-03-06.
The best air quality in Decatur, Indiana was observed at 05:00:00 on 2026-03-06.
The air quality in Decatur, Indiana right now is Good, with an AQI of 49.
In Decatur, Indiana, PM2.5 is the most frequently found pollutant.
When air quality in Decatur, Indiana is compromised, staying indoors and wearing a mask can reduce health risks.
Decatur, Indiana currently has a PM2.5 concentration of 8.676 μg/m3.
Decatur, Indiana currently has a PM10 concentration of 24.487 μg/m3.
The current carbon monoxide (CO) level in Decatur, Indiana is 0.204 ppm.
The current sulfur dioxide (SO2) concentration in Decatur, Indiana is 1.274 ppb.
Decatur, Indiana currently has an ozone (O3) concentration of 32.674 ppm.
The current level of nitrogen dioxide (NO2) in Decatur, Indiana is 5.313 ppb.
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