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Real-time air quality index in Chicago, Illinois today

Stay updated with real-time air quality in Chicago, 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)

49

Good

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Chicago, Illinois

Last updated: ... (Local time)

Common air pollutants in Chicago, Illinois

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

8.96 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

39.44 μg/m³

0

55

155

255

425

605+

Ozone (O3)

34.49 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

0.44 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

3.17 ppb

0

54

101

361

1250

2050+

Carbon Monoxide (CO)

0.43 ppm

0

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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Chicago, Illinois

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Chicago, Illinois air quality map: Real-time AQI near you




How accurate is Illinois, USA air quality data?

Air quality measurements for Illinois, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.


Frequently asked questions

How frequently is the air quality data for Chicago, Illinois updated?

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Air quality data for Chicago, Illinois is updated on an hourly basis.


When did Chicago, Illinois experience the worst air quality in the last 24 hours?

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The worst air quality in Chicago, Illinois was recorded at 12:00:00 on 2025-07-30.


When did Chicago, Illinois have its best air quality in the last 24 hours?

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The best air quality in Chicago, Illinois was recorded at 04:00:00 on 2025-07-30.


What is the real-time air quality index for Chicago, Illinois?

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The real-time air quality index in Chicago, Illinois is 49, currently categorized as Good.


Which pollutant is found most often in Chicago, Illinois?

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The most common pollutant in Chicago, Illinois is PM2.5.


What can I do if the air quality in Chicago, Illinois is poor?

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If the air quality in Chicago, Illinois is poor, limit outdoor activities and use a mask to safeguard your health.


What are the current PM2.5 levels in Chicago, Illinois?

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The measured PM2.5 levels in Chicago, Illinois at present are 9.454 μg/m3.


What are the current PM10 levels at Chicago, Illinois?

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The current PM10 levels in Chicago, Illinois are 42.273 μg/m3.


What are the current carbon monoxide (CO) levels at Chicago, Illinois?

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The current carbon monoxide (CO) level in Chicago, Illinois is 0.343 ppm.


What are the current sulfur dioxide (SO2) levels at Chicago, Illinois?

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The current sulfur dioxide (SO2) levels in Chicago, Illinois are 0.493 ppb.


What are the current ozone (O3) levels at Chicago, Illinois?

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The current ozone (O3) levels at Chicago, Illinois is 44.052 ppm.


What are the current nitrogen dioxide (NO2) levels at Chicago, Illinois?

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The current nitrogen dioxide (NO2) levels at Chicago, Illinois is 5.737 ppb.


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