Stay updated with real-time air quality in Washington, 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)
33
Good
Washington, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.93 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
27.14 μg/m³
0
55
155
255
425
605+
29.04 ppb
0
55
71
86
201
201+
0.40 ppb
0
36
76
186
605
1005+
17.93 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Washington, Illinois
Washington, Illinois
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AQI 32
Good
4.94μg/m³
PM2.5
25.15μg/m³
PM10
35.20ppb
O3
0.39ppb
SO2
11.35ppb
NO2
0.15ppm
CO
AQI 33
Good
6.31μg/m³
PM2.5
28.98μg/m³
PM10
30.31ppb
O3
0.38ppb
SO2
11.18ppb
NO2
0.15ppm
CO
AQI 38
Good
6.66μg/m³
PM2.5
29.91μg/m³
PM10
30.68ppb
O3
0.38ppb
SO2
11.19ppb
NO2
0.15ppm
CO
AQI 31
Good
5.05μg/m³
PM2.5
33.14μg/m³
PM10
31.32ppb
O3
0.40ppb
SO2
11.36ppb
NO2
0.15ppm
CO
AQI 30
Good
4.87μg/m³
PM2.5
22.65μg/m³
PM10
32.00ppb
O3
0.78ppb
SO2
12.51ppb
NO2
0.14ppm
CO
AQI 30
Good
4.88μg/m³
PM2.5
22.69μg/m³
PM10
32.03ppb
O3
0.78ppb
SO2
12.49ppb
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 Washington, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Washington, Illinois was at its worst at 03:00:00 on 2026-10-07.
In the last 24 hours, the best air quality in Washington, Illinois was observed at 05:00:00 on 2026-10-06.
As of now, the AQI in Washington, Illinois is 33, indicating Good conditions.
Washington, Illinois air has the highest levels of O3.
Poor air quality in Washington, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Washington, Illinois are currently 5.041 μg/m3.
The PM10 concentration in Washington, Illinois is 30.328 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Washington, Illinois is 0.145 ppm.
Currently, Washington, Illinois has a sulfur dioxide (SO2) concentration of 0.626 ppb.
The current ozone (O3) level in Washington, Illinois at the moment is 36.41 ppm.
Nitrogen dioxide (NO2) level in Washington, Illinois at the moment is 11.25 ppb.
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