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Chicago Air Quality Index (AQI) | Air Pollution

Real-time PM2.5, PM10 air pollution level in Illinois

Last Updated: 2025-07-31 04:25:16 AM (Local Time)

Live AQI

Air Quality is

Moderate

pm10 : 27 µg/m³

PM2.5 : 17 µg/m³

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

21 °C

Last Updated: 2025-07-31 04:25:16 AM (Local Time)

Map

Chicago

Major Air Pollutants
Chicago

Particulate Matter(PM2.5)

17µg/m³

Particulate Matter(PM10)

27µg/m³

Carbon Monoxide(CO)

70ppb

Sulfur Dioxide(SO2)

1ppb

Nitrogen Dioxide(NO2)

7ppb

Ozone(O3)

25ppb

Trending in United States

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AQI Graph

Historical Air Quality Data
Chicago

24 Hours

AQI

Chicago

AQI

30-07-2025Time31-07-2025

Time	Chicago
04 AM	44
05 AM	44
06 AM	43
07 AM	47
08 AM	50
09 AM	50
10 AM	48
11 AM	45
12 PM	44
01 PM	44
02 PM	46
03 PM	46
04 PM	46
05 PM	46
06 PM	46
07 PM	46
08 PM	46
09 PM	52
10 PM	56
11 PM	56
12 AM	59
01 AM	60
02 AM	61
03 AM	63
04 AM	67

Min.at 6:10 AM on 30th Jul

Max.at 4:10 AM on 31st Jul

Want air quality data?

AQI Trends - Annual Air Quality Changes
Chicago, Illinois, United States

AQI

Year

AQI

AQI	AQI
Feb 2025	41
Mar 2025	33
Apr 2025	32
May 2025	28
Jun 2025	54
Jul 2025	50

Annual AQI Trends

2025

39AQI

Overall Annual Percentage (%) change of AQI in (2025 to 2025)

NaN%

Rise (Worsened AQI)

Most & Least Polluted Months

Most PollutedJune, 202554AQI

Least PollutedMay, 202528AQI

* This data analysis is from year 2025 - 2025

Chicago's Locations
Real-time Air Pollution Level

Location

Status

AQI

PM2.5(µg/m³)

PM10(µg/m³)

Temp.(°C)

Humi.(%)

Moderate

Moderate

Moderate

Moderate

Moderate

United States's Metro Cities
Air Quality Index

Chicago

Los Angeles

Minneapolis

141

Nashville

New Orleans

New York City

San Francisco

Washington

Air Quality Calendar 2025
Chicago

2025

AQI

January

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
29 Dec -	30 Dec -	31 Dec -	1 Jan -	2 Jan -	3 Jan -	4 Jan -
5 Jan -	6 Jan -	7 Jan -	8 Jan -	9 Jan -	10 Jan -	11 Jan -
12 Jan -	13 Jan -	14 Jan -	15 Jan -	16 Jan -	17 Jan -	18 Jan -
19 Jan -	20 Jan -	21 Jan -	22 Jan -	23 Jan -	24 Jan -	25 Jan -
26 Jan -	27 Jan -	28 Jan -	29 Jan -	30 Jan -	31 Jan -	1 Feb -

February

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
26 Jan -	27 Jan -	28 Jan -	29 Jan -	30 Jan -	31 Jan -	1 Feb -
2 Feb -	3 Feb -	4 Feb -	5 Feb -	6 Feb -	7 Feb -	8 Feb -
9 Feb -	10 Feb -	11 Feb -	12 Feb -	13 Feb -	14 Feb -	15 Feb -
16 Feb -	17 Feb -	18 Feb -	19 Feb -	20 Feb -	21 Feb -	22 Feb -
23 Feb -	24 Feb -	25 Feb -	26 Feb -	27 Feb 53	28 Feb 28	1 Mar 23

March

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
23 Feb -	24 Feb -	25 Feb -	26 Feb -	27 Feb 53	28 Feb 28	1 Mar 23
2 Mar 25	3 Mar 37	4 Mar 35	5 Mar 38	6 Mar 21	7 Mar 23	8 Mar 33
9 Mar 27	10 Mar 28	11 Mar 33	12 Mar 24	13 Mar 36	14 Mar 53	15 Mar 75
16 Mar 53	17 Mar 26	18 Mar 24	19 Mar 32	20 Mar 29	21 Mar 23	22 Mar 22
23 Mar 23	24 Mar 21	25 Mar 29	26 Mar 38	27 Mar 51	28 Mar 45	29 Mar 36
30 Mar 34	31 Mar 20	1 Apr 21	2 Apr 36	3 Apr 28	4 Apr 29	5 Apr 24

April

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
30 Mar 34	31 Mar 20	1 Apr 21	2 Apr 36	3 Apr 28	4 Apr 29	5 Apr 24
6 Apr 23	7 Apr 25	8 Apr 19	9 Apr 33	10 Apr 48	11 Apr 45	12 Apr 53
13 Apr 44	14 Apr 34	15 Apr 20	16 Apr 22	17 Apr 35	18 Apr 49	19 Apr 42
20 Apr 40	21 Apr 22	22 Apr 31	23 Apr 31	24 Apr 52	25 Apr 28	26 Apr 19
27 Apr 27	28 Apr 35	29 Apr 36	30 Apr 21	1 May 30	2 May 28	3 May 17

May

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
27 Apr 27	28 Apr 35	29 Apr 36	30 Apr 21	1 May 30	2 May 28	3 May 17
4 May 17	5 May 22	6 May 38	7 May 40	8 May 18	9 May 23	10 May 32
11 May 23	12 May 37	13 May 34	14 May 33	15 May 45	16 May 37	17 May 22
18 May 20	19 May 19	20 May 25	21 May 21	22 May 15	23 May 20	24 May 18
25 May 16	26 May 22	27 May 26	28 May 31	29 May 41	30 May 46	31 May 39

June

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
1 Jun 36	2 Jun 42	3 Jun 57	4 Jun 58	5 Jun 98	6 Jun 85	7 Jun 81
8 Jun 78	9 Jun 71	10 Jun 61	11 Jun 72	12 Jun 80	13 Jun 76	14 Jun 63
15 Jun 50	16 Jun 55	17 Jun 49	18 Jun 37	19 Jun 31	20 Jun 43	21 Jun 42
22 Jun 46	23 Jun 56	24 Jun 47	25 Jun 34	26 Jun 47	27 Jun 38	28 Jun 24
29 Jun 36	30 Jun 33	1 Jul 33	2 Jul 54	3 Jul 54	4 Jul 57	5 Jul 73

July

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
29 Jun 36	30 Jun 33	1 Jul 33	2 Jul 54	3 Jul 54	4 Jul 57	5 Jul 73
6 Jul 54	7 Jul 53	8 Jul 67	9 Jul 52	10 Jul 45	11 Jul 45	12 Jul 31
13 Jul 57	14 Jul 72	15 Jul 80	16 Jul 51	17 Jul 27	18 Jul 29	19 Jul 37
20 Jul 29	21 Jul 68	22 Jul 78	23 Jul 63	24 Jul 56	25 Jul 34	26 Jul 37
27 Jul 33	28 Jul 43	29 Jul 46	30 Jul 46	31 Jul -	1 Aug -	2 Aug -

Health Advice For People Living In
Chicago

0Cigarettes per day

Weekly 0 Cigarettes

Monthly 0 Cigarettes

Breathe easy and get active! The air quality is perfect for enjoying outdoor activities.

Source:

Berkeley Earth

Disclaimer: This cigarette-equivalent estimate is based on the average PM2.5 concentration over the last 24 hours, assuming continuous exposure during that time.

Solutions for Current AQI

Air PurifierTurn On
Car FilterMust
N95 MaskMust
Stay IndoorMust

Must turn on the air purifier to enjoy fresh air.

Get an Air Purifier

Prevent Health Problems: Understand Your Risks

Chicago

Asthma
Heart Issues
Allergies
Sinus
Cold/Flu
Chronic (COPD)

Mid. Chances of Asthma

Asthma

Risk of Asthma symptoms is Mid. when AQI is Moderate (50-150)

Moderate symptoms including frequent wheezing, noticeable shortness of breath, chest tightness, and persistent cough.

Do's :

Limit outdoor activities when AQI is poor.
Clean indoor air with an air purifier to reduce exposure.
Soothe the respiratory tract with herbal teas or warm water to help alleviate symptoms.

Don'ts :

Exercise outdoors without a mask.
Stay in smoky areas with strong fumes.

Disclaimer: The above health risks are precautionary suggestions based on current AQI levels. You may not feel the effects immediately, but prolonged exposure to air pollution can contribute to these health conditions over time. AQI.IN is neither a medical expert nor a provider of medical advice. Please consult a doctor if you experience any of the above similar symptoms.

Most Polluted Cities 2025
United States

Analyze the real-time most air polluted cities in the country.

Most Polluted Cities Live Ranking 2025

World's Most PollutedCity Rankings (2024)

World's Most PollutedCountry Rankings(2024)

RankCityAQIAQI Status

Standard Value

Northwest St. Louis, United States

Unhealthy

11xabove Standard

Bemidji, United States

Unhealthy

11xabove Standard

Red Lake, United States

Unhealthy

11xabove Standard

Cass Lake, United States

Unhealthy

11xabove Standard

Eau Claire, United States

Unhealthy

10xabove Standard

Cloquet, United States

Unhealthy

10xabove Standard

Altoona, United States

Unhealthy

10xabove Standard

Dennison, United States

Unhealthy

10xabove Standard

Apple Valley, United States

Unhealthy

10xabove Standard

10.

Maplewood, United States

Unhealthy

10xabove Standard

Last Updated: 31 Jul 2025, 09:38 AM

AQI City Rankings

Air Quality Solutions For Chicago
Explore the solutions of air quality monitoring & clean air.

Here are some applications that you can go through to find out the solutions.

Air Quality Monitor

Monitor the air quality

Air Quality Sensors

Sensors to measure the air quality

Fresh Air Machine

Clean the air you breathe

Car Cabin Filter

Purify the air in your car

N95 Mask

Shield yourself from pollution

air quality solutions for offices for Chicago

Air Quality Solution For Offices

A complete solution for air quality monitoring, data analysis, and fresh air solutions in workplaces prioritizing employee's health and productivity.

Air Quality Solutions For Smart City

Prana Air smart city project provides air quality monitors, drones, outdoor air purifiers, and data dashboards solution to improve air quality.

air quality solutions for institutes for Chicago

Air Quality Solutions for Schools | Institutes

Prana Air provides the air quality solutions for schools by air monitoring & fresh air machine that help the students to breather clean air.

Air Quality Solutions For Hotels

Prana Air air quality solutions are suited for hotel businesses. The occupancy of hotels is the main reasons for bad air quality.

Air Quality Solutions for Restaurants

Prana Air has the air quality solutions for restaurant, cafes, and gives you the power to know what your customers and staff breathe.

Air Quality Solutions for RMC Plants

Prana Air provides air quality monitoring solutions for RMC plants. Improve compliance, protect workers and community, and reduce emissions.

Air Quality Solutions for Fitness Center

Prana Air provides the air quality solutions of pollution monitoring and fresh air for fitness center - gym.

Air Quality Solutions for Parking Lot

A complete solution for air monitoring, data analysis, and fresh air solutions for enclosed car parking areas and car lots.

Air Quality Solutions for Retail Stores

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets.

air quality solutions for airport for Chicago

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets

Prana Air provides the air quality solutions for airport. Gathering of many passengers is the main reasons of bad air quality in airport.

Air Quality Solutions For Construction Sites

Prana Air offers air quality monitoring solutions for construction sites with data cloud storage, web-dashboard, mobile apps, TV display.

Air Quality Solutions For Hospitals

Prana Air provides air quality monitoring and fresh air solutions for hospitals to ensure clean and healthy indoor air.

air quality solutions for bathroom for Chicago

Air Quality Solutions For Washroom | Bathroom

Improve washroom and bathroom air quality with Prana Air air quality monitoring devices and fresh air machine. Breathe easy and stay healthy.

Air Quality Solutions for Banks

Prana Air provides air quality solutions of pollution monitoring and fresh air for banks and financial institutions.

Air Quality Solutions for Cinema

Air quality solutions for cinema halls or theatres will help the customers to get the good experience, comfort and breathe clean air.

Air Quality Solutions For Real Estates

Prana Air provides the air quality solutions of pollution monitoring and fresh air for real estates - residential and commercial.

Chicago's AQI Data Analytics Solutions
Air quality data monitoring platforms

Mobile App

Smart TV App

Web Dashboard

API

Widgets

Mobile App

Empower Your Decisions with Reliable Data

Get it onApp Store

Get it onGoogle Play

Your area’s real-time data with detailed parameters.

Personalized health advice as per current AQI.

Analytical data to identify trends and conditions.

Connect and control your air quality devices.

Air Quality FAQs
at Chicago

Frequently Asked Questions About Air Quality

What is the current AQI level in Chicago?

The current real-time AQI level in Chicago is 66 (Moderate) due to recent rainfall by 16.91mm/hr. This was last updated 2025-07-31 04:25:16 AM (Local Time).

When was the best AQI level in Chicago in the last 24 hours?

The best AQI level was 43 (Good) at 6:10 AM, Jul 30, 2025 (Local Time) during the last 24 hours.

When was the worst AQI level in Chicago in the last 24 hours?

The worst AQI level was 67 (Moderate) at 4:10 AM (Local Time) during the last 24 hours.

What is the current trend of AQI levels in Chicago during last 24 hours?

The AQI levels in Chicago have been fluctuating throughout the last 24 hours. The levels have increased by highest 67 at 4:10 AM (Local Time), lowest 43 at 6:10 AM, Jul 30, 2025 (Local Time).

What actions are recommended as per the current AQI level in Chicago?

Current AQI levels are acceptable; however, some pollutants may be a concern for a small number of sensitive individuals.