Stay updated with real-time air quality in Ottawa, 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)
42
Good
Ottawa, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
7.02 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
30.86 μg/m³
0
55
155
255
425
605+
44.52 ppb
0
55
71
86
201
201+
0.17 ppb
0
36
76
186
605
1005+
0.95 ppb
0
54
101
361
1250
2050+
0.15 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Ottawa, Illinois
Ottawa, Illinois
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AQI 40
Good
6.71μg/m³
PM2.5
29.78μg/m³
PM10
42.79ppb
O3
0.15ppb
SO2
0.81ppb
NO2
0.15ppm
CO
AQI 35
Good
5.37μg/m³
PM2.5
23.50μg/m³
PM10
38.39ppb
O3
0.44ppb
SO2
4.62ppb
NO2
0.27ppm
CO
AQI 36
Good
5.06μg/m³
PM2.5
25.85μg/m³
PM10
38.67ppb
O3
0.47ppb
SO2
4.80ppb
NO2
0.27ppm
CO
AQI 35
Good
4.93μg/m³
PM2.5
24.42μg/m³
PM10
38.49ppb
O3
0.46ppb
SO2
4.79ppb
NO2
0.27ppm
CO
AQI 36
Good
5.05μg/m³
PM2.5
24.96μg/m³
PM10
38.93ppb
O3
0.45ppb
SO2
4.71ppb
NO2
0.27ppm
CO
AQI 36
Good
4.65μg/m³
PM2.5
20.14μg/m³
PM10
39.48ppb
O3
0.41ppb
SO2
4.78ppb
NO2
0.28ppm
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 Ottawa, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Ottawa, Illinois was at its worst at 11:00:00 on 2026-08-11.
In the last 24 hours, the best air quality in Ottawa, Illinois was observed at 04:00:00 on 2026-08-12.
As of now, the AQI in Ottawa, Illinois is 49, indicating Good conditions.
Ottawa, Illinois air has the highest levels of PM2.5.
Poor air quality in Ottawa, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Ottawa, Illinois are currently 8.653 μg/m3.
The PM10 concentration in Ottawa, Illinois is 38.612 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Ottawa, Illinois is 0.15 ppm.
Currently, Ottawa, Illinois has a sulfur dioxide (SO2) concentration of 0.169 ppb.
The current ozone (O3) level in Ottawa, Illinois at the moment is 47.959 ppm.
Nitrogen dioxide (NO2) level in Ottawa, Illinois at the moment is 0.884 ppb.
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