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)
44
Good
Decatur, Indiana
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
8.13 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
31.29 μg/m³
0
55
155
255
425
605+
26.85 ppb
0
55
71
86
201
201+
0.91 ppb
0
36
76
186
605
1005+
7.27 ppb
0
54
101
361
1250
2050+
0.21 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Decatur, Indiana
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AQI 49
Good
9.49μg/m³
PM2.5
18.91μg/m³
PM10
31.16ppb
O3
0.91ppb
SO2
3.65ppb
NO2
0.21ppm
CO
AQI 38
Good
6.80μg/m³
PM2.5
29.91μg/m³
PM10
37.22ppb
O3
0.81ppb
SO2
3.57ppb
NO2
0.23ppm
CO
AQI 38
Good
7.14μg/m³
PM2.5
29.55μg/m³
PM10
30.51ppb
O3
1.06ppb
SO2
3.84ppb
NO2
0.20ppm
CO
AQI 38
Good
6.76μg/m³
PM2.5
29.90μg/m³
PM10
36.96ppb
O3
0.82ppb
SO2
3.57ppb
NO2
0.23ppm
CO
AQI 52
Moderate
10.12μg/m³
PM2.5
42.44μg/m³
PM10
25.01ppb
O3
0.67ppb
SO2
4.95ppb
NO2
0.16ppm
CO
AQI 44
Good
8.20μg/m³
PM2.5
33.09μg/m³
PM10
26.63ppb
O3
0.86ppb
SO2
3.72ppb
NO2
0.23ppm
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 11:00:00, 2026-06-07.
The best air quality in Decatur, Indiana was observed at 04:00:00 on 2026-06-08.
The air quality in Decatur, Indiana right now is Good, with an AQI of 44.
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 7.605 μg/m3.
Decatur, Indiana currently has a PM10 concentration of 27.268 μg/m3.
The current carbon monoxide (CO) level in Decatur, Indiana is 0.21 ppm.
The current sulfur dioxide (SO2) concentration in Decatur, Indiana is 1.065 ppb.
Decatur, Indiana currently has an ozone (O3) concentration of 32.083 ppm.
The current level of nitrogen dioxide (NO2) in Decatur, Indiana is 3.86 ppb.
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