Stay updated with real-time air quality in Mount Vernon, 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)
40
Good
Mount Vernon, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.67 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
29.59 μg/m³
0
55
155
255
425
605+
42.79 ppb
0
55
71
86
201
201+
0.48 ppb
0
36
76
186
605
1005+
1.53 ppb
0
54
101
361
1250
2050+
0.15 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Mount Vernon, Illinois
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AQI 37
Good
5.95μg/m³
PM2.5
26.07μg/m³
PM10
40.37ppb
O3
0.44ppb
SO2
1.48ppb
NO2
0.14ppm
CO
AQI 39
Good
5.85μg/m³
PM2.5
25.11μg/m³
PM10
41.95ppb
O3
0.39ppb
SO2
1.59ppb
NO2
0.15ppm
CO
AQI 36
Good
6.23μg/m³
PM2.5
27.84μg/m³
PM10
39.25ppb
O3
0.38ppb
SO2
1.77ppb
NO2
0.15ppm
CO
AQI 40
Good
5.32μg/m³
PM2.5
23.00μg/m³
PM10
43.48ppb
O3
0.34ppb
SO2
1.43ppb
NO2
0.14ppm
CO
AQI 44
Good
7.99μg/m³
PM2.5
34.99μg/m³
PM10
41.83ppb
O3
0.49ppb
SO2
1.92ppb
NO2
0.15ppm
CO
AQI 44
Good
8.01μg/m³
PM2.5
35.09μg/m³
PM10
41.90ppb
O3
0.49ppb
SO2
1.94ppb
NO2
0.15ppm
CO
The air quality data for Illinois, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Mount Vernon, Illinois are available every hour.
Mount Vernon, Illinois experienced its worst air quality at 11:00:00, 2026-04-23.
The best air quality in Mount Vernon, Illinois was observed at 09:00:00 on 2026-04-23.
The air quality in Mount Vernon, Illinois right now is Good, with an AQI of 40.
In Mount Vernon, Illinois, O3 is the most frequently found pollutant.
When air quality in Mount Vernon, Illinois is compromised, staying indoors and wearing a mask can reduce health risks.
Mount Vernon, Illinois currently has a PM2.5 concentration of 6.669 μg/m3.
Mount Vernon, Illinois currently has a PM10 concentration of 29.594 μg/m3.
The current carbon monoxide (CO) level in Mount Vernon, Illinois is 0.146 ppm.
The current sulfur dioxide (SO2) concentration in Mount Vernon, Illinois is 0.479 ppb.
Mount Vernon, Illinois currently has an ozone (O3) concentration of 42.787 ppm.
The current level of nitrogen dioxide (NO2) in Mount Vernon, Illinois is 1.527 ppb.
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