Stay updated with real-time air quality in Crest Hill, 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
Crest Hill, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.59 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
10.64 μg/m³
0
55
155
255
425
605+
8.97 ppb
0
55
71
86
201
201+
1.91 ppb
0
36
76
186
605
1005+
25.42 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Crest Hill, Illinois
Crest Hill, Illinois
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AQI 33
Good
6.42μg/m³
PM2.5
28.62μg/m³
PM10
23.64ppb
O3
0.66ppb
SO2
20.99ppb
NO2
0.23ppm
CO
AQI 33
Good
5.63μg/m³
PM2.5
25.15μg/m³
PM10
26.32ppb
O3
0.66ppb
SO2
20.88ppb
NO2
0.23ppm
CO
AQI 27
Good
5.38μg/m³
PM2.5
22.70μg/m³
PM10
20.77ppb
O3
0.64ppb
SO2
21.73ppb
NO2
0.23ppm
CO
AQI 27
Good
5.46μg/m³
PM2.5
24.32μg/m³
PM10
26.95ppb
O3
0.66ppb
SO2
20.92ppb
NO2
0.23ppm
CO
AQI 33
Good
6.11μg/m³
PM2.5
27.06μg/m³
PM10
24.01ppb
O3
0.65ppb
SO2
21.27ppb
NO2
0.22ppm
CO
AQI 27
Good
5.21μg/m³
PM2.5
27.11μg/m³
PM10
26.41ppb
O3
0.68ppb
SO2
20.70ppb
NO2
0.23ppm
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 Crest Hill, Illinois is updated every hour for accuracy.
In the past 24 hours, the air quality in Crest Hill, Illinois was at its worst at 05:00:00 on 2026-10-05.
In the last 24 hours, the best air quality in Crest Hill, Illinois was observed at 06:00:00 on 2026-10-05.
As of now, the AQI in Crest Hill, Illinois is 33, indicating Good conditions.
Crest Hill, Illinois air has the highest levels of PM2.5.
Poor air quality in Crest Hill, Illinois means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Crest Hill, Illinois are currently 6.4 μg/m3.
The PM10 concentration in Crest Hill, Illinois is 28.538 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Crest Hill, Illinois is 0.233 ppm.
Currently, Crest Hill, Illinois has a sulfur dioxide (SO2) concentration of 0.655 ppb.
The current ozone (O3) level in Crest Hill, Illinois at the moment is 23.69 ppm.
Nitrogen dioxide (NO2) level in Crest Hill, Illinois at the moment is 20.993 ppb.
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