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)
29
Good
Crest Hill, Illinois
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
12.24 μg/m³
0
55
155
255
425
605+
31.27 ppb
0
55
71
86
201
201+
0.73 ppb
0
36
76
186
605
1005+
7.45 ppb
0
54
101
361
1250
2050+
0.14 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 31
Good
2.93μg/m³
PM2.5
12.15μg/m³
PM10
33.29ppb
O3
0.80ppb
SO2
6.56ppb
NO2
0.14ppm
CO
AQI 31
Good
3.21μg/m³
PM2.5
13.71μg/m³
PM10
32.55ppb
O3
0.80ppb
SO2
6.92ppb
NO2
0.14ppm
CO
AQI 30
Good
3.20μg/m³
PM2.5
21.30μg/m³
PM10
32.45ppb
O3
0.82ppb
SO2
5.40ppb
NO2
0.14ppm
CO
AQI 29
Good
3.66μg/m³
PM2.5
20.37μg/m³
PM10
31.21ppb
O3
0.79ppb
SO2
10.50ppb
NO2
0.14ppm
CO
AQI 31
Good
3.17μg/m³
PM2.5
13.67μg/m³
PM10
32.95ppb
O3
0.81ppb
SO2
6.39ppb
NO2
0.14ppm
CO
AQI 31
Good
3.22μg/m³
PM2.5
15.08μg/m³
PM10
33.34ppb
O3
0.77ppb
SO2
10.53ppb
NO2
0.14ppm
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 2026-01-22.
In the last 24 hours, the best air quality in Crest Hill, Illinois was observed at 04:00:00 on 2026-01-22.
As of now, the AQI in Crest Hill, Illinois is 31, 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 2.932 μg/m3.
The PM10 concentration in Crest Hill, Illinois is 12.188 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Crest Hill, Illinois is 0.14 ppm.
Currently, Crest Hill, Illinois has a sulfur dioxide (SO2) concentration of 0.8 ppb.
The current ozone (O3) level in Crest Hill, Illinois at the moment is 33.288 ppm.
Nitrogen dioxide (NO2) level in Crest Hill, Illinois at the moment is 6.557 ppb.
All Rights Reserved © Ambee Inc. 2025