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)
24
Good
Washington, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
4.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.43 μg/m³
0
55
155
255
425
605+
26.23 ppb
0
55
71
86
201
201+
0.63 ppb
0
36
76
186
605
1005+
2.63 ppb
0
54
101
361
1250
2050+
0.19 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Washington, Illinois
Washington, Illinois
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AQI 27
Good
4.57μg/m³
PM2.5
17.64μg/m³
PM10
21.03ppb
O3
0.90ppb
SO2
8.49ppb
NO2
0.16ppm
CO
AQI 27
Good
4.75μg/m³
PM2.5
20.48μg/m³
PM10
22.54ppb
O3
0.92ppb
SO2
8.38ppb
NO2
0.16ppm
CO
AQI 27
Good
4.62μg/m³
PM2.5
20.05μg/m³
PM10
20.41ppb
O3
1.17ppb
SO2
8.40ppb
NO2
0.16ppm
CO
AQI 22
Good
4.47μg/m³
PM2.5
20.05μg/m³
PM10
20.02ppb
O3
0.58ppb
SO2
4.80ppb
NO2
0.17ppm
CO
AQI 22
Good
3.90μg/m³
PM2.5
17.00μg/m³
PM10
23.00ppb
O3
1.36ppb
SO2
8.89ppb
NO2
0.15ppm
CO
AQI 22
Good
3.91μg/m³
PM2.5
17.05μg/m³
PM10
23.00ppb
O3
1.35ppb
SO2
8.88ppb
NO2
0.15ppm
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 11:00:00 on 2025-08-29.
In the last 24 hours, the best air quality in Washington, Illinois was observed at 10:00:00 on 2025-08-30.
As of now, the AQI in Washington, Illinois is 22, 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 4.127 μg/m3.
The PM10 concentration in Washington, Illinois is 20.183 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Washington, Illinois is 0.162 ppm.
Currently, Washington, Illinois has a sulfur dioxide (SO2) concentration of 1.256 ppb.
The current ozone (O3) level in Washington, Illinois at the moment is 19.983 ppm.
Nitrogen dioxide (NO2) level in Washington, Illinois at the moment is 8.611 ppb.
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