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)
39
Good
Mattoon, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.44 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
23.73 μg/m³
0
55
155
255
425
605+
42.36 ppb
0
55
71
86
201
201+
1.20 ppb
0
36
76
186
605
1005+
3.64 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Mattoon, Illinois
Mattoon, Illinois
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AQI 39
Good
4.46μg/m³
PM2.5
23.52μg/m³
PM10
41.62ppb
O3
1.23ppb
SO2
3.83ppb
NO2
0.20ppm
CO
AQI 41
Good
4.61μg/m³
PM2.5
24.28μg/m³
PM10
43.97ppb
O3
1.20ppb
SO2
3.01ppb
NO2
0.20ppm
CO
AQI 35
Good
4.79μg/m³
PM2.5
20.96μg/m³
PM10
38.05ppb
O3
0.76ppb
SO2
3.00ppb
NO2
0.19ppm
CO
AQI 39
Good
4.14μg/m³
PM2.5
18.48μg/m³
PM10
42.13ppb
O3
1.11ppb
SO2
3.82ppb
NO2
0.19ppm
CO
AQI 39
Good
4.10μg/m³
PM2.5
18.05μg/m³
PM10
42.16ppb
O3
1.13ppb
SO2
3.85ppb
NO2
0.19ppm
CO
AQI 41
Good
4.47μg/m³
PM2.5
19.52μg/m³
PM10
43.67ppb
O3
0.93ppb
SO2
3.44ppb
NO2
0.18ppm
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 10:00:00 on 2026-07-23.
In the last 24 hours, the best air quality in Mattoon, Illinois was observed at 02:00:00 on 2026-07-23.
As of now, the AQI in Mattoon, Illinois is 39, indicating Good conditions.
Mattoon, Illinois air has the highest levels of O3.
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 4.441 μg/m3.
The PM10 concentration in Mattoon, Illinois is 23.727 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Mattoon, Illinois is 0.196 ppm.
Currently, Mattoon, Illinois has a sulfur dioxide (SO2) concentration of 1.203 ppb.
The current ozone (O3) level in Mattoon, Illinois at the moment is 42.358 ppm.
Nitrogen dioxide (NO2) level in Mattoon, Illinois at the moment is 3.642 ppb.
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