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)
66
Moderate
Crest Hill, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
16.87 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
73.98 μg/m³
0
55
155
255
425
605+
25.51 ppb
0
55
71
86
201
201+
1.00 ppb
0
36
76
186
605
1005+
11.69 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Crest Hill, Illinois
Crest Hill, Illinois
Scroll To Air Quality MapLoading...
AQI 66
Moderate
16.85μg/m³
PM2.5
74.16μg/m³
PM10
25.67ppb
O3
1.00ppb
SO2
11.69ppb
NO2
0.18ppm
CO
AQI 66
Moderate
17.35μg/m³
PM2.5
66.54μg/m³
PM10
20.27ppb
O3
0.99ppb
SO2
11.95ppb
NO2
0.18ppm
CO
AQI 67
Moderate
18.44μg/m³
PM2.5
73.66μg/m³
PM10
26.28ppb
O3
0.88ppb
SO2
10.53ppb
NO2
0.18ppm
CO
AQI 67
Moderate
17.52μg/m³
PM2.5
64.42μg/m³
PM10
18.61ppb
O3
0.98ppb
SO2
11.97ppb
NO2
0.19ppm
CO
AQI 66
Moderate
17.07μg/m³
PM2.5
71.27μg/m³
PM10
21.67ppb
O3
0.93ppb
SO2
11.45ppb
NO2
0.19ppm
CO
AQI 71
Moderate
19.61μg/m³
PM2.5
81.74μg/m³
PM10
25.28ppb
O3
1.09ppb
SO2
12.66ppb
NO2
0.18ppm
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 03:00:00 on 2026-07-13.
In the last 24 hours, the best air quality in Crest Hill, Illinois was observed at 01:00:00 on 2026-07-13.
As of now, the AQI in Crest Hill, Illinois is 66, indicating Moderate 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 16.866 μg/m3.
The PM10 concentration in Crest Hill, Illinois is 73.978 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Crest Hill, Illinois is 0.182 ppm.
Currently, Crest Hill, Illinois has a sulfur dioxide (SO2) concentration of 0.996 ppb.
The current ozone (O3) level in Crest Hill, Illinois at the moment is 25.506 ppm.
Nitrogen dioxide (NO2) level in Crest Hill, Illinois at the moment is 11.691 ppb.
All Rights Reserved © Ambee Inc. 2025