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)
42
Good
Crest Hill, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.90 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
25.57 μg/m³
0
55
155
255
425
605+
44.69 ppb
0
55
71
86
201
201+
1.97 ppb
0
36
76
186
605
1005+
5.75 ppb
0
54
101
361
1250
2050+
0.15 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 42
Good
5.88μg/m³
PM2.5
25.47μg/m³
PM10
44.62ppb
O3
1.97ppb
SO2
5.76ppb
NO2
0.15ppm
CO
AQI 44
Good
6.72μg/m³
PM2.5
30.23μg/m³
PM10
47.52ppb
O3
1.99ppb
SO2
5.61ppb
NO2
0.15ppm
CO
AQI 42
Good
7.02μg/m³
PM2.5
26.48μg/m³
PM10
44.56ppb
O3
1.88ppb
SO2
5.68ppb
NO2
0.15ppm
CO
AQI 44
Good
6.95μg/m³
PM2.5
31.48μg/m³
PM10
48.42ppb
O3
1.99ppb
SO2
5.50ppb
NO2
0.15ppm
CO
AQI 43
Good
6.11μg/m³
PM2.5
26.81μg/m³
PM10
45.80ppb
O3
1.95ppb
SO2
5.33ppb
NO2
0.15ppm
CO
AQI 40
Good
5.88μg/m³
PM2.5
27.48μg/m³
PM10
43.48ppb
O3
2.09ppb
SO2
5.91ppb
NO2
0.16ppm
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 08:00:00 on 2026-07-23.
In the last 24 hours, the best air quality in Crest Hill, Illinois was observed at 03:00:00 on 2026-07-23.
As of now, the AQI in Crest Hill, Illinois is 42, indicating Good conditions.
Crest Hill, Illinois air has the highest levels of O3.
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 5.902 μg/m3.
The PM10 concentration in Crest Hill, Illinois is 25.574 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Crest Hill, Illinois is 0.147 ppm.
Currently, Crest Hill, Illinois has a sulfur dioxide (SO2) concentration of 1.972 ppb.
The current ozone (O3) level in Crest Hill, Illinois at the moment is 44.694 ppm.
Nitrogen dioxide (NO2) level in Crest Hill, Illinois at the moment is 5.75 ppb.
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