Stay updated with real-time air quality in Mattoon, Illinois 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
Mattoon, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.59 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.26 μg/m³
0
55
155
255
425
605+
19.50 ppb
0
55
71
86
201
201+
0.75 ppb
0
36
76
186
605
1005+
23.31 ppb
0
54
101
361
1250
2050+
0.45 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Mattoon, Illinois
Mattoon, Illinois
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AQI 38
Good
6.59μg/m³
PM2.5
30.30μg/m³
PM10
25.39ppb
O3
0.79ppb
SO2
22.00ppb
NO2
0.40ppm
CO
AQI 54
Moderate
11.38μg/m³
PM2.5
41.20μg/m³
PM10
16.27ppb
O3
0.86ppb
SO2
27.85ppb
NO2
0.47ppm
CO
AQI 49
Good
8.57μg/m³
PM2.5
37.86μg/m³
PM10
20.21ppb
O3
0.62ppb
SO2
22.49ppb
NO2
0.31ppm
CO
AQI 44
Good
7.82μg/m³
PM2.5
34.52μg/m³
PM10
20.41ppb
O3
0.40ppb
SO2
24.41ppb
NO2
0.21ppm
CO
AQI 44
Good
8.06μg/m³
PM2.5
35.79μg/m³
PM10
18.59ppb
O3
0.41ppb
SO2
24.77ppb
NO2
0.21ppm
CO
AQI 38
Good
7.24μg/m³
PM2.5
31.71μg/m³
PM10
15.06ppb
O3
0.36ppb
SO2
22.09ppb
NO2
0.22ppm
CO
Air quality and pollutant data for Illinois, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Mattoon, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Mattoon, Illinois was at its worst at 03:00:00 on 2026-10-08.
In the last 24 hours, the best air quality in Mattoon, Illinois was observed at 10:00:00 on 2026-10-08.
As of now, the AQI in Mattoon, Illinois is 38, indicating Good conditions.
Mattoon, Illinois air has the highest levels of PM2.5.
Poor air quality in Mattoon, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Mattoon, Illinois are currently 7.152 μg/m3.
The PM10 concentration in Mattoon, Illinois is 28.874 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Mattoon, Illinois is 0.394 ppm.
Currently, Mattoon, Illinois has a sulfur dioxide (SO2) concentration of 0.757 ppb.
The current ozone (O3) level in Mattoon, Illinois at the moment is 26.315 ppm.
Nitrogen dioxide (NO2) level in Mattoon, Illinois at the moment is 21.981 ppb.
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