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
5.80 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.22 μg/m³
0
55
155
255
425
605+
13.55 ppb
0
55
71
86
201
201+
0.63 ppb
0
36
76
186
605
1005+
1.47 ppb
0
54
101
361
1250
2050+
0.12 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Washington, Illinois
Washington, Illinois
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AQI 38
Good
7.11μg/m³
PM2.5
37.88μg/m³
PM10
12.40ppb
O3
0.53ppb
SO2
6.17ppb
NO2
0.14ppm
CO
AQI 38
Good
7.16μg/m³
PM2.5
35.21μg/m³
PM10
12.62ppb
O3
0.41ppb
SO2
5.91ppb
NO2
0.14ppm
CO
AQI 38
Good
7.20μg/m³
PM2.5
32.31μg/m³
PM10
12.90ppb
O3
0.41ppb
SO2
5.92ppb
NO2
0.14ppm
CO
AQI 38
Good
6.64μg/m³
PM2.5
37.30μg/m³
PM10
12.15ppb
O3
0.52ppb
SO2
6.00ppb
NO2
0.14ppm
CO
AQI 33
Good
6.20μg/m³
PM2.5
28.01μg/m³
PM10
18.00ppb
O3
0.65ppb
SO2
6.17ppb
NO2
0.13ppm
CO
AQI 33
Good
6.22μg/m³
PM2.5
28.14μg/m³
PM10
17.92ppb
O3
0.65ppb
SO2
6.17ppb
NO2
0.13ppm
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 01:00:00 on 2025-07-20.
In the last 24 hours, the best air quality in Washington, Illinois was observed at 07:00:00 on 2025-07-19.
As of now, the AQI in Washington, Illinois is 44, 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 8.318 μg/m3.
The PM10 concentration in Washington, Illinois is 38.28 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Washington, Illinois is 0.116 ppm.
Currently, Washington, Illinois has a sulfur dioxide (SO2) concentration of 0.684 ppb.
The current ozone (O3) level in Washington, Illinois at the moment is 13.504 ppm.
Nitrogen dioxide (NO2) level in Washington, Illinois at the moment is 3.389 ppb.
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