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)
54
Moderate
Crest Hill, Illinois
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
11.42 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
49.59 μg/m³
0
55
155
255
425
605+
40.50 ppb
0
55
71
86
201
201+
1.49 ppb
0
36
76
186
605
1005+
1.83 ppb
0
54
101
361
1250
2050+
0.19 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 52
Moderate
10.41μg/m³
PM2.5
46.53μg/m³
PM10
32.03ppb
O3
1.17ppb
SO2
1.75ppb
NO2
0.17ppm
CO
AQI 56
Moderate
12.31μg/m³
PM2.5
54.81μg/m³
PM10
35.12ppb
O3
1.14ppb
SO2
1.75ppb
NO2
0.17ppm
CO
AQI 52
Moderate
10.26μg/m³
PM2.5
44.81μg/m³
PM10
31.54ppb
O3
1.10ppb
SO2
1.76ppb
NO2
0.16ppm
CO
AQI 60
Moderate
13.56μg/m³
PM2.5
59.30μg/m³
PM10
36.33ppb
O3
1.13ppb
SO2
1.75ppb
NO2
0.17ppm
CO
AQI 60
Moderate
14.12μg/m³
PM2.5
60.05μg/m³
PM10
35.30ppb
O3
1.14ppb
SO2
1.76ppb
NO2
0.17ppm
CO
AQI 49
Good
8.69μg/m³
PM2.5
39.91μg/m³
PM10
31.16ppb
O3
1.21ppb
SO2
1.55ppb
NO2
0.17ppm
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 11:00:00 on 2025-07-21.
In the last 24 hours, the best air quality in Crest Hill, Illinois was observed at 08:00:00 on 2025-07-20.
As of now, the AQI in Crest Hill, Illinois is 54, 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 11.424 μg/m3.
The PM10 concentration in Crest Hill, Illinois is 49.587 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Crest Hill, Illinois is 0.186 ppm.
Currently, Crest Hill, Illinois has a sulfur dioxide (SO2) concentration of 1.485 ppb.
The current ozone (O3) level in Crest Hill, Illinois at the moment is 40.5 ppm.
Nitrogen dioxide (NO2) level in Crest Hill, Illinois at the moment is 1.828 ppb.
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