Stay updated with real-time air quality in Marion, 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)
54
Moderate
Marion, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
10.93 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
48.42 μg/m³
0
55
155
255
425
605+
21.33 ppb
0
55
71
86
201
201+
1.64 ppb
0
36
76
186
605
1005+
5.62 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Marion, Illinois
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AQI 27
Good
4.85μg/m³
PM2.5
17.40μg/m³
PM10
12.32ppb
O3
0.47ppb
SO2
4.56ppb
NO2
0.17ppm
CO
AQI 27
Good
4.93μg/m³
PM2.5
16.24μg/m³
PM10
13.23ppb
O3
0.47ppb
SO2
4.59ppb
NO2
0.17ppm
CO
AQI 22
Good
4.18μg/m³
PM2.5
20.32μg/m³
PM10
12.85ppb
O3
0.61ppb
SO2
3.52ppb
NO2
0.21ppm
CO
AQI 22
Good
4.09μg/m³
PM2.5
20.46μg/m³
PM10
17.32ppb
O3
0.48ppb
SO2
4.56ppb
NO2
0.17ppm
CO
AQI 22
Good
4.34μg/m³
PM2.5
20.05μg/m³
PM10
16.08ppb
O3
0.48ppb
SO2
4.34ppb
NO2
0.18ppm
CO
AQI 33
Good
6.09μg/m³
PM2.5
26.99μg/m³
PM10
15.99ppb
O3
0.48ppb
SO2
5.58ppb
NO2
0.17ppm
CO
Air quality data and pollutant measurements for Illinois, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Marion, Illinois is updated every hour.
The worst air quality in Marion, Illinois in the last 24 hours was observed at 06:00:00 on 2025-07-17.
In the last 24 hrs, the best air quality in Marion, Illinois was observed at 09:00:00 on 2025-07-18.
The current air quality in Marion, Illinois is 22, categorized as Good based on real-time data.
The most common pollutant in Marion, Illinois is PM2.5.
If the air quality in Marion, Illinois is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Marion, Illinois is 4.112 μg/m3.
The current PM10 concentration at Marion, Illinois is 20.426 μg/m3.
The current carbon monoxide (CO) concentration at Marion, Illinois is 0.173 ppm.
The current sulfur dioxide (SO2) concentration at Marion, Illinois is 0.469 ppb.
The current ozone (O3) concentration at Marion, Illinois is 16.696 ppm.
The current nitrogen dioxide (NO2) concentration at Marion, Illinois is 4.657 ppb.
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