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)
52
Moderate
Mattoon, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
10.11 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
49.79 μg/m³
0
55
155
255
425
605+
54.04 ppb
0
55
71
86
201
201+
1.83 ppb
0
36
76
186
605
1005+
4.99 ppb
0
54
101
361
1250
2050+
0.20 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Mattoon, Illinois
Mattoon, Illinois
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AQI 54
Moderate
11.46μg/m³
PM2.5
45.94μg/m³
PM10
53.44ppb
O3
1.56ppb
SO2
7.06ppb
NO2
0.20ppm
CO
AQI 54
Moderate
10.70μg/m³
PM2.5
47.19μg/m³
PM10
55.96ppb
O3
1.73ppb
SO2
4.37ppb
NO2
0.22ppm
CO
AQI 47
Good
7.91μg/m³
PM2.5
34.44μg/m³
PM10
51.38ppb
O3
0.20ppb
SO2
1.39ppb
NO2
0.15ppm
CO
AQI 52
Moderate
10.34μg/m³
PM2.5
45.67μg/m³
PM10
53.39ppb
O3
0.51ppb
SO2
2.31ppb
NO2
0.14ppm
CO
AQI 52
Moderate
10.39μg/m³
PM2.5
45.96μg/m³
PM10
53.31ppb
O3
0.51ppb
SO2
2.22ppb
NO2
0.14ppm
CO
AQI 52
Moderate
10.12μg/m³
PM2.5
44.85μg/m³
PM10
53.88ppb
O3
0.52ppb
SO2
3.54ppb
NO2
0.14ppm
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 11:00:00 on 2026-04-23.
In the last 24 hours, the best air quality in Mattoon, Illinois was observed at 05:00:00 on 2026-04-23.
As of now, the AQI in Mattoon, Illinois is 54, indicating Moderate 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 11.081 μg/m3.
The PM10 concentration in Mattoon, Illinois is 46.942 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Mattoon, Illinois is 0.2 ppm.
Currently, Mattoon, Illinois has a sulfur dioxide (SO2) concentration of 1.464 ppb.
The current ozone (O3) level in Mattoon, Illinois at the moment is 54.058 ppm.
Nitrogen dioxide (NO2) level in Mattoon, Illinois at the moment is 4.258 ppb.
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