Real-time air quality index in Freeport, Illinois today
Stay updated with real-time air quality in Freeport, 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)
16
Good
Freeport, Illinois
Last updated: ... (Local time)
Common air pollutants in Freeport, Illinois
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
3.01 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
14.03 μg/m³
0
55
155
255
425
605+
Ozone (O3)
16.32 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.31 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
4.32 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.13 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Freeport, Illinois
Freeport, Illinois
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Freeport, Illinois air quality map: Real-time AQI near you
Air quality in nearby cities
Monroe, Wisconsin
AQI 54
Moderate
10.55μg/m³
PM2.5
43.99μg/m³
PM10
18.37ppb
O3
0.62ppb
SO2
4.85ppb
NO2
0.19ppm
CO
Rockford, Illinois
AQI 56
Moderate
12.39μg/m³
PM2.5
56.87μg/m³
PM10
16.48ppb
O3
0.95ppb
SO2
5.36ppb
NO2
0.20ppm
CO
Loves Park, Illinois
AQI 52
Moderate
10.30μg/m³
PM2.5
36.92μg/m³
PM10
13.03ppb
O3
0.94ppb
SO2
5.39ppb
NO2
0.20ppm
CO
Machesney Park, Illinois
AQI 52
Moderate
10.35μg/m³
PM2.5
37.48μg/m³
PM10
13.20ppb
O3
0.94ppb
SO2
5.39ppb
NO2
0.20ppm
CO
Roscoe, Illinois
AQI 52
Moderate
10.35μg/m³
PM2.5
39.34μg/m³
PM10
15.22ppb
O3
0.92ppb
SO2
5.41ppb
NO2
0.20ppm
CO
Dixon, Illinois
AQI 52
Moderate
9.83μg/m³
PM2.5
23.38μg/m³
PM10
15.79ppb
O3
0.78ppb
SO2
4.61ppb
NO2
0.21ppm
CO
How accurate is Illinois, USA air quality data?
Air quality measurements for Illinois, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Frequently asked questions
How frequently is the air quality data for Freeport, Illinois updated?
Air quality data for Freeport, Illinois is updated on an hourly basis.
When did Freeport, Illinois experience the worst air quality in the last 24 hours?
The worst air quality in Freeport, Illinois was recorded at 11:00:00 on 2025-09-03.
When did Freeport, Illinois have its best air quality in the last 24 hours?
The best air quality in Freeport, Illinois was recorded at 01:00:00 on 2025-09-04.
What is the real-time air quality index for Freeport, Illinois?
The real-time air quality index in Freeport, Illinois is 56, currently categorized as Moderate.
Which pollutant is found most often in Freeport, Illinois?
The most common pollutant in Freeport, Illinois is PM2.5.
What can I do if the air quality in Freeport, Illinois is poor?
If the air quality in Freeport, Illinois is poor, limit outdoor activities and use a mask to safeguard your health.
What are the current PM2.5 levels in Freeport, Illinois?
The measured PM2.5 levels in Freeport, Illinois at present are 12.311 μg/m3.
What are the current PM10 levels at Freeport, Illinois?
The current PM10 levels in Freeport, Illinois are 48.519 μg/m3.
What are the current carbon monoxide (CO) levels at Freeport, Illinois?
The current carbon monoxide (CO) level in Freeport, Illinois is 0.206 ppm.
What are the current sulfur dioxide (SO2) levels at Freeport, Illinois?
The current sulfur dioxide (SO2) levels in Freeport, Illinois are 0.516 ppb.
What are the current ozone (O3) levels at Freeport, Illinois?
The current ozone (O3) levels at Freeport, Illinois is 20.002 ppm.
What are the current nitrogen dioxide (NO2) levels at Freeport, Illinois?
The current nitrogen dioxide (NO2) levels at Freeport, Illinois is 4.016 ppb.
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