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)
33
Good
Decatur, Indiana
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.96 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
23.40 μg/m³
0
55
155
255
425
605+
33.95 ppb
0
55
71
86
201
201+
0.98 ppb
0
36
76
186
605
1005+
3.54 ppb
0
54
101
361
1250
2050+
0.15 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Decatur, Indiana
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AQI 33
Good
5.82μg/m³
PM2.5
24.58μg/m³
PM10
33.39ppb
O3
0.97ppb
SO2
3.44ppb
NO2
0.15ppm
CO
AQI 38
Good
6.53μg/m³
PM2.5
28.64μg/m³
PM10
31.10ppb
O3
0.83ppb
SO2
3.66ppb
NO2
0.15ppm
CO
AQI 33
Good
5.50μg/m³
PM2.5
23.67μg/m³
PM10
31.59ppb
O3
1.07ppb
SO2
4.69ppb
NO2
0.15ppm
CO
AQI 38
Good
6.64μg/m³
PM2.5
29.18μg/m³
PM10
30.58ppb
O3
0.83ppb
SO2
3.52ppb
NO2
0.15ppm
CO
AQI 38
Good
7.07μg/m³
PM2.5
30.40μg/m³
PM10
39.98ppb
O3
1.34ppb
SO2
2.01ppb
NO2
0.16ppm
CO
AQI 33
Good
5.49μg/m³
PM2.5
20.74μg/m³
PM10
35.69ppb
O3
0.80ppb
SO2
3.19ppb
NO2
0.15ppm
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, 2026-03-09.
The best air quality in Decatur, Indiana was observed at 12:00:00 on 2026-03-09.
The air quality in Decatur, Indiana right now is Good, with an AQI of 33.
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 5.965 μg/m3.
Decatur, Indiana currently has a PM10 concentration of 23.399 μg/m3.
The current carbon monoxide (CO) level in Decatur, Indiana is 0.15 ppm.
The current sulfur dioxide (SO2) concentration in Decatur, Indiana is 0.982 ppb.
Decatur, Indiana currently has an ozone (O3) concentration of 33.947 ppm.
The current level of nitrogen dioxide (NO2) in Decatur, Indiana is 3.542 ppb.
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