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
11.50 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
43.94 μg/m³
0
55
155
255
425
605+
36.16 ppb
0
55
71
86
201
201+
0.57 ppb
0
36
76
186
605
1005+
2.26 ppb
0
54
101
361
1250
2050+
0.21 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Marion, Illinois
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AQI 38
Good
6.63μg/m³
PM2.5
30.89μg/m³
PM10
40.23ppb
O3
0.87ppb
SO2
1.84ppb
NO2
0.16ppm
CO
AQI 38
Good
6.63μg/m³
PM2.5
27.92μg/m³
PM10
39.95ppb
O3
0.91ppb
SO2
2.19ppb
NO2
0.16ppm
CO
AQI 38
Good
6.52μg/m³
PM2.5
27.31μg/m³
PM10
39.31ppb
O3
0.93ppb
SO2
1.84ppb
NO2
0.16ppm
CO
AQI 38
Good
7.43μg/m³
PM2.5
28.15μg/m³
PM10
40.85ppb
O3
0.91ppb
SO2
2.18ppb
NO2
0.16ppm
CO
AQI 38
Good
7.01μg/m³
PM2.5
31.17μg/m³
PM10
39.91ppb
O3
0.94ppb
SO2
2.18ppb
NO2
0.16ppm
CO
AQI 44
Good
7.70μg/m³
PM2.5
34.03μg/m³
PM10
23.00ppb
O3
0.77ppb
SO2
1.68ppb
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 02:00:00 on 2025-07-09.
In the last 24 hrs, the best air quality in Marion, Illinois was observed at 07:00:00 on 2025-07-09.
The current air quality in Marion, Illinois is 44, 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 7.594 μg/m3.
The current PM10 concentration at Marion, Illinois is 35.384 μg/m3.
The current carbon monoxide (CO) concentration at Marion, Illinois is 0.161 ppm.
The current sulfur dioxide (SO2) concentration at Marion, Illinois is 0.798 ppb.
The current ozone (O3) concentration at Marion, Illinois is 42.853 ppm.
The current nitrogen dioxide (NO2) concentration at Marion, Illinois is 2.135 ppb.
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