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)
44
Good
Washington, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
8.30 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
34.17 μg/m³
0
55
155
255
425
605+
25.55 ppb
0
55
71
86
201
201+
0.67 ppb
0
36
76
186
605
1005+
4.01 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Washington, Illinois
Washington, Illinois
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AQI 49
Good
8.88μg/m³
PM2.5
42.50μg/m³
PM10
16.18ppb
O3
0.51ppb
SO2
12.48ppb
NO2
0.23ppm
CO
AQI 49
Good
9.09μg/m³
PM2.5
40.96μg/m³
PM10
18.15ppb
O3
0.50ppb
SO2
12.31ppb
NO2
0.23ppm
CO
AQI 49
Good
9.10μg/m³
PM2.5
41.00μg/m³
PM10
18.16ppb
O3
0.50ppb
SO2
12.30ppb
NO2
0.23ppm
CO
AQI 49
Good
9.08μg/m³
PM2.5
41.14μg/m³
PM10
18.04ppb
O3
0.54ppb
SO2
12.44ppb
NO2
0.23ppm
CO
AQI 33
Good
6.10μg/m³
PM2.5
27.00μg/m³
PM10
17.63ppb
O3
0.52ppb
SO2
12.81ppb
NO2
0.21ppm
CO
AQI 33
Good
6.12μg/m³
PM2.5
27.08μg/m³
PM10
17.65ppb
O3
0.52ppb
SO2
12.81ppb
NO2
0.21ppm
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 06:00:00 on 2025-11-13.
In the last 24 hours, the best air quality in Washington, Illinois was observed at 04:00:00 on 2025-11-14.
As of now, the AQI in Washington, Illinois is 49, indicating Good conditions.
Washington, Illinois air has the highest levels of PM2.5.
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 8.816 μg/m3.
The PM10 concentration in Washington, Illinois is 45.879 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Washington, Illinois is 0.229 ppm.
Currently, Washington, Illinois has a sulfur dioxide (SO2) concentration of 0.386 ppb.
The current ozone (O3) level in Washington, Illinois at the moment is 18.67 ppm.
Nitrogen dioxide (NO2) level in Washington, Illinois at the moment is 14.002 ppb.
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