Country Background

Chicago, Illinois, United States Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

August Air Quality Analysis

Chicago, Illinois, United States

2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
6th Aug 2025
93AQI
Lowest AQI recorded on
20th Aug 2025
19AQI


Same Day Analysis (29th August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 20 of Good air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 29th Aug - 30th Aug 2025

Chicago, Illinois, United States

AQI
Day
Night
.

5 AM29th Aug 2025

7 PM

4 AM30th Aug 2025

Day time
Avg. Highest Time
9AM29th Aug

24AQI

Avg. Lowest Time
3PM29th Aug

17AQI

Night time
Avg. Highest Time
2AM30th Aug

21AQI

Avg. Lowest Time
5AM29th Aug

19AQI

In the last 24 hours,

Chicago's AQI reached its highest point of 24 at 9 AM during the Day, while the lowest point, 17, was recorded at 3 PM during the Day between 29th Aug and 30th Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Chicago, Illinois, United States

JulAug
31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th
Day
Night
31st Jul 2025725 AMAQI
31st Jul 2025836 AMAQI
31st Jul 2025927 AMAQI
31st Jul 20251028 AMAQI
31st Jul 20251149 AMAQI
31st Jul 202511810 AMAQI
31st Jul 202514011 AMAQI
31st Jul 202513812 PMAQI
31st Jul 20251411 PMAQI
31st Jul 20251482 PMAQI
31st Jul 20251213 PMAQI
31st Jul 20251094 PMAQI
31st Jul 20251305 PMAQI
31st Jul 20251316 PMAQI
31st Jul 20251087 PMAQI
31st Jul 20251198 PMAQI
31st Jul 20251209 PMAQI
31st Jul 202511810 PMAQI
31st Jul 202511611 PMAQI
1st Aug 202511212 AMAQI
1st Aug 2025971 AMAQI
1st Aug 2025932 AMAQI
1st Aug 2025983 AMAQI
1st Aug 20251004 AMAQI

23°C20/26°C

1st Aug 20251035 AMAQI
1st Aug 2025996 AMAQI
1st Aug 2025927 AMAQI
1st Aug 2025958 AMAQI
1st Aug 20251049 AMAQI
1st Aug 20258810 AMAQI
1st Aug 20258111 AMAQI
1st Aug 20257812 PMAQI
1st Aug 2025781 PMAQI
1st Aug 2025752 PMAQI
1st Aug 2025733 PMAQI
1st Aug 2025784 PMAQI
1st Aug 2025875 PMAQI
1st Aug 2025826 PMAQI
1st Aug 2025897 PMAQI
1st Aug 2025828 PMAQI
1st Aug 2025809 PMAQI
1st Aug 20257810 PMAQI
1st Aug 20258511 PMAQI
2nd Aug 20258512 AMAQI
2nd Aug 2025871 AMAQI
2nd Aug 2025842 AMAQI
2nd Aug 2025843 AMAQI
2nd Aug 2025814 AMAQI

22°C20/24°C

2nd Aug 2025845 AMAQI
2nd Aug 2025736 AMAQI
2nd Aug 2025727 AMAQI
2nd Aug 2025718 AMAQI
2nd Aug 2025749 AMAQI
2nd Aug 20257510 AMAQI
2nd Aug 20257211 AMAQI
2nd Aug 20256712 PMAQI
2nd Aug 2025631 PMAQI
2nd Aug 2025602 PMAQI
2nd Aug 2025603 PMAQI
2nd Aug 2025574 PMAQI
2nd Aug 2025585 PMAQI
2nd Aug 2025596 PMAQI
2nd Aug 2025757 PMAQI
2nd Aug 2025718 PMAQI
2nd Aug 2025689 PMAQI
2nd Aug 20256810 PMAQI
2nd Aug 20257511 PMAQI
3rd Aug 20257712 AMAQI
3rd Aug 2025771 AMAQI
3rd Aug 2025792 AMAQI
3rd Aug 2025793 AMAQI
3rd Aug 2025804 AMAQI

23°C18/27°C

3rd Aug 2025775 AMAQI
3rd Aug 2025766 AMAQI
3rd Aug 2025767 AMAQI
3rd Aug 2025788 AMAQI
3rd Aug 2025729 AMAQI
3rd Aug 20257210 AMAQI
3rd Aug 20257111 AMAQI
3rd Aug 20256912 PMAQI
3rd Aug 2025721 PMAQI
3rd Aug 2025762 PMAQI
3rd Aug 2025763 PMAQI
3rd Aug 2025754 PMAQI
3rd Aug 2025765 PMAQI
3rd Aug 2025766 PMAQI
3rd Aug 2025857 PMAQI
3rd Aug 2025848 PMAQI
3rd Aug 2025859 PMAQI
3rd Aug 20259210 PMAQI
3rd Aug 202510611 PMAQI
4th Aug 202511812 AMAQI
4th Aug 20251181 AMAQI
4th Aug 20251122 AMAQI
4th Aug 20251123 AMAQI
4th Aug 20251104 AMAQI

23°C19/27°C

4th Aug 20251015 AMAQI
4th Aug 2025926 AMAQI
4th Aug 2025907 AMAQI
4th Aug 2025938 AMAQI
4th Aug 2025899 AMAQI
4th Aug 20258410 AMAQI
4th Aug 20257911 AMAQI
4th Aug 20257312 PMAQI
4th Aug 2025661 PMAQI
4th Aug 2025662 PMAQI
4th Aug 2025683 PMAQI
4th Aug 2025654 PMAQI
4th Aug 2025645 PMAQI
4th Aug 2025636 PMAQI
4th Aug 2025827 PMAQI
4th Aug 2025718 PMAQI
4th Aug 2025629 PMAQI
4th Aug 20256210 PMAQI
4th Aug 20256311 PMAQI
5th Aug 20256412 AMAQI
5th Aug 2025661 AMAQI
5th Aug 2025702 AMAQI
5th Aug 2025703 AMAQI
5th Aug 2025764 AMAQI

22°C20/26°C

5th Aug 2025795 AMAQI
5th Aug 2025826 AMAQI
5th Aug 2025847 AMAQI
5th Aug 2025888 AMAQI
5th Aug 2025949 AMAQI
5th Aug 20259710 AMAQI
5th Aug 202510011 AMAQI
5th Aug 20259812 PMAQI
5th Aug 2025941 PMAQI
5th Aug 2025852 PMAQI
5th Aug 2025843 PMAQI
5th Aug 2025864 PMAQI
5th Aug 2025875 PMAQI
5th Aug 2025926 PMAQI
5th Aug 2025807 PMAQI
5th Aug 2025958 PMAQI
5th Aug 20251099 PMAQI
5th Aug 202510910 PMAQI
5th Aug 202511011 PMAQI
6th Aug 202511212 AMAQI
6th Aug 20251121 AMAQI
6th Aug 20251112 AMAQI
6th Aug 20251013 AMAQI
6th Aug 20251034 AMAQI

23°C20/26°C

6th Aug 20251005 AMAQI
6th Aug 20251006 AMAQI
6th Aug 2025997 AMAQI
6th Aug 2025998 AMAQI
6th Aug 2025969 AMAQI
6th Aug 20259610 AMAQI
6th Aug 20259011 AMAQI
6th Aug 20258812 PMAQI
6th Aug 2025871 PMAQI
6th Aug 2025842 PMAQI
6th Aug 2025823 PMAQI
6th Aug 2025824 PMAQI
6th Aug 2025815 PMAQI
6th Aug 2025796 PMAQI
6th Aug 20251027 PMAQI
6th Aug 2025878 PMAQI
6th Aug 2025769 PMAQI
6th Aug 20257510 PMAQI
6th Aug 20257411 PMAQI
7th Aug 20258012 AMAQI
7th Aug 2025821 AMAQI
7th Aug 2025792 AMAQI
7th Aug 2025793 AMAQI
7th Aug 2025794 AMAQI

25°C21/31°C

7th Aug 2025765 AMAQI
7th Aug 2025736 AMAQI
7th Aug 2025747 AMAQI
7th Aug 2025728 AMAQI
7th Aug 2025709 AMAQI
7th Aug 20256810 AMAQI
7th Aug 20256211 AMAQI
7th Aug 20255912 PMAQI
7th Aug 2025581 PMAQI
7th Aug 2025602 PMAQI
7th Aug 2025633 PMAQI
7th Aug 2025634 PMAQI
7th Aug 2025645 PMAQI
7th Aug 2025646 PMAQI
7th Aug 2025677 PMAQI
7th Aug 2025658 PMAQI
7th Aug 2025639 PMAQI
7th Aug 20256310 PMAQI
7th Aug 20256311 PMAQI
8th Aug 20256412 AMAQI
8th Aug 2025601 AMAQI
8th Aug 2025542 AMAQI
8th Aug 2025533 AMAQI
8th Aug 2025534 AMAQI

27°C22/32°C

8th Aug 2025525 AMAQI
8th Aug 2025536 AMAQI
8th Aug 2025557 AMAQI
8th Aug 2025558 AMAQI
8th Aug 2025559 AMAQI
8th Aug 20255610 AMAQI
8th Aug 20255711 AMAQI
8th Aug 20255612 PMAQI
8th Aug 2025561 PMAQI
8th Aug 2025572 PMAQI
8th Aug 2025573 PMAQI
8th Aug 2025574 PMAQI
8th Aug 2025575 PMAQI
8th Aug 2025566 PMAQI
8th Aug 2025567 PMAQI
8th Aug 2025578 PMAQI
8th Aug 2025589 PMAQI
8th Aug 20255710 PMAQI
8th Aug 20255611 PMAQI
9th Aug 20255612 AMAQI
9th Aug 2025551 AMAQI
9th Aug 2025522 AMAQI
9th Aug 2025513 AMAQI
9th Aug 2025514 AMAQI

29°C23/33°C

9th Aug 2025515 AMAQI
9th Aug 2025526 AMAQI
9th Aug 2025537 AMAQI
9th Aug 2025548 AMAQI
9th Aug 2025549 AMAQI
9th Aug 20255410 AMAQI
9th Aug 20255411 AMAQI
9th Aug 20255312 PMAQI
9th Aug 2025531 PMAQI
9th Aug 2025532 PMAQI
9th Aug 2025543 PMAQI
9th Aug 2025544 PMAQI
9th Aug 2025535 PMAQI
9th Aug 2025536 PMAQI
9th Aug 2025537 PMAQI
9th Aug 2025538 PMAQI
9th Aug 2025539 PMAQI
9th Aug 20255210 PMAQI
9th Aug 20255211 PMAQI
10th Aug 20255212 AMAQI
10th Aug 2025511 AMAQI
10th Aug 2025482 AMAQI
10th Aug 2025473 AMAQI
10th Aug 2025484 AMAQI

29°C23/34°C

10th Aug 2025485 AMAQI
10th Aug 2025486 AMAQI
10th Aug 2025487 AMAQI
10th Aug 2025488 AMAQI
10th Aug 2025499 AMAQI
10th Aug 20254910 AMAQI
10th Aug 20254811 AMAQI
10th Aug 20254712 PMAQI
10th Aug 2025471 PMAQI
10th Aug 2025482 PMAQI
10th Aug 2025493 PMAQI
10th Aug 2025484 PMAQI
10th Aug 2025485 PMAQI
10th Aug 2025486 PMAQI
10th Aug 2025497 PMAQI
10th Aug 2025498 PMAQI
10th Aug 2025489 PMAQI
10th Aug 20254910 PMAQI
10th Aug 20254911 PMAQI
11th Aug 20254812 AMAQI
11th Aug 2025481 AMAQI
11th Aug 2025482 AMAQI
11th Aug 2025483 AMAQI
11th Aug 2025484 AMAQI

29°C25/33°C

11th Aug 2025485 AMAQI
11th Aug 2025496 AMAQI
11th Aug 2025497 AMAQI
11th Aug 2025488 AMAQI
11th Aug 2025489 AMAQI
11th Aug 20254910 AMAQI
11th Aug 20254911 AMAQI
11th Aug 20254712 PMAQI
11th Aug 2025451 PMAQI
11th Aug 2025452 PMAQI
11th Aug 2025443 PMAQI
11th Aug 2025404 PMAQI
11th Aug 2025395 PMAQI
11th Aug 2025396 PMAQI
11th Aug 2025477 PMAQI
11th Aug 2025448 PMAQI
11th Aug 2025429 PMAQI
11th Aug 20254310 PMAQI
11th Aug 20254211 PMAQI
12th Aug 20254012 AMAQI
12th Aug 2025401 AMAQI
12th Aug 2025402 AMAQI
12th Aug 2025383 AMAQI
12th Aug 2025404 AMAQI

26°C23/32°C

12th Aug 2025465 AMAQI
12th Aug 2025486 AMAQI
12th Aug 2025497 AMAQI
12th Aug 2025488 AMAQI
12th Aug 2025459 AMAQI
12th Aug 20254110 AMAQI
12th Aug 20254011 AMAQI
12th Aug 20254412 PMAQI
12th Aug 2025471 PMAQI
12th Aug 2025512 PMAQI
12th Aug 2025523 PMAQI
12th Aug 2025474 PMAQI
12th Aug 2025415 PMAQI
12th Aug 2025386 PMAQI
12th Aug 2025427 PMAQI
12th Aug 2025388 PMAQI
12th Aug 2025379 PMAQI
12th Aug 20253810 PMAQI
12th Aug 20253711 PMAQI
13th Aug 20253512 AMAQI
13th Aug 2025351 AMAQI
13th Aug 2025342 AMAQI
13th Aug 2025323 AMAQI
13th Aug 2025334 AMAQI

29°C24/35°C

13th Aug 2025335 AMAQI
13th Aug 2025366 AMAQI
13th Aug 2025427 AMAQI
13th Aug 2025478 AMAQI
13th Aug 2025529 AMAQI
13th Aug 20255310 AMAQI
13th Aug 20255611 AMAQI
13th Aug 20255812 PMAQI
13th Aug 2025601 PMAQI
13th Aug 2025622 PMAQI
13th Aug 2025633 PMAQI
13th Aug 2025624 PMAQI
13th Aug 2025615 PMAQI
13th Aug 2025616 PMAQI
13th Aug 2025477 PMAQI
13th Aug 2025528 PMAQI
13th Aug 2025579 PMAQI
13th Aug 20255610 PMAQI
13th Aug 20255711 PMAQI
14th Aug 20255612 AMAQI
14th Aug 2025551 AMAQI
14th Aug 2025542 AMAQI
14th Aug 2025553 AMAQI
14th Aug 2025564 AMAQI

25°C22/26°C

14th Aug 2025565 AMAQI
14th Aug 2025586 AMAQI
14th Aug 2025607 AMAQI
14th Aug 2025648 AMAQI
14th Aug 2025689 AMAQI
14th Aug 20256910 AMAQI
14th Aug 20257111 AMAQI
14th Aug 20257212 PMAQI
14th Aug 2025731 PMAQI
14th Aug 2025742 PMAQI
14th Aug 2025753 PMAQI
14th Aug 2025774 PMAQI
14th Aug 2025785 PMAQI
14th Aug 2025776 PMAQI
14th Aug 2025657 PMAQI
14th Aug 2025718 PMAQI
14th Aug 2025769 PMAQI
14th Aug 20257510 PMAQI
14th Aug 20257611 PMAQI
15th Aug 20257612 AMAQI
15th Aug 2025771 AMAQI
15th Aug 2025782 AMAQI
15th Aug 2025783 AMAQI
15th Aug 2025774 AMAQI

24°C19/29°C

15th Aug 2025785 AMAQI
15th Aug 2025816 AMAQI
15th Aug 2025807 AMAQI
15th Aug 2025828 AMAQI
15th Aug 2025829 AMAQI
15th Aug 20258210 AMAQI
15th Aug 20257811 AMAQI
15th Aug 20257512 PMAQI
15th Aug 2025741 PMAQI
15th Aug 2025732 PMAQI
15th Aug 2025713 PMAQI
15th Aug 2025694 PMAQI
15th Aug 2025665 PMAQI
15th Aug 2025656 PMAQI
15th Aug 2025777 PMAQI
15th Aug 2025698 PMAQI
15th Aug 2025639 PMAQI
15th Aug 20256310 PMAQI
15th Aug 20256311 PMAQI
16th Aug 20256512 AMAQI
16th Aug 2025641 AMAQI
16th Aug 2025642 AMAQI
16th Aug 2025643 AMAQI
16th Aug 2025644 AMAQI

27°C21/34°C

16th Aug 2025645 AMAQI
16th Aug 2025626 AMAQI
16th Aug 2025617 AMAQI
16th Aug 2025598 AMAQI
16th Aug 2025579 AMAQI
16th Aug 20255510 AMAQI
16th Aug 20255611 AMAQI
16th Aug 20255612 PMAQI
16th Aug 2025561 PMAQI
16th Aug 2025572 PMAQI
16th Aug 2025583 PMAQI
16th Aug 2025594 PMAQI
16th Aug 2025615 PMAQI
16th Aug 2025606 PMAQI
16th Aug 2025597 PMAQI
16th Aug 2025588 PMAQI
16th Aug 2025569 PMAQI
16th Aug 20255410 PMAQI
16th Aug 20255511 PMAQI
17th Aug 20255412 AMAQI
17th Aug 2025551 AMAQI
17th Aug 2025542 AMAQI
17th Aug 2025523 AMAQI
17th Aug 2025454 AMAQI

29°C25/35°C

17th Aug 2025365 AMAQI
17th Aug 2025346 AMAQI
17th Aug 2025317 AMAQI
17th Aug 2025288 AMAQI
17th Aug 2025279 AMAQI
17th Aug 20252710 AMAQI
17th Aug 20253111 AMAQI
17th Aug 20253312 PMAQI
17th Aug 2025361 PMAQI
17th Aug 2025362 PMAQI
17th Aug 2025363 PMAQI
17th Aug 2025364 PMAQI
17th Aug 2025355 PMAQI
17th Aug 2025346 PMAQI
17th Aug 2025387 PMAQI
17th Aug 2025338 PMAQI
17th Aug 2025299 PMAQI
17th Aug 20252810 PMAQI
17th Aug 20252811 PMAQI
18th Aug 20252812 AMAQI
18th Aug 2025281 AMAQI
18th Aug 2025282 AMAQI
18th Aug 2025273 AMAQI
18th Aug 2025284 AMAQI

24°C23/26°C

18th Aug 2025305 AMAQI
18th Aug 2025366 AMAQI
18th Aug 2025407 AMAQI
18th Aug 2025428 AMAQI
18th Aug 2025439 AMAQI
18th Aug 20254210 AMAQI
18th Aug 20254311 AMAQI
18th Aug 20254612 PMAQI
18th Aug 2025481 PMAQI
18th Aug 2025502 PMAQI
18th Aug 2025503 PMAQI
18th Aug 2025524 PMAQI
18th Aug 2025535 PMAQI
18th Aug 2025526 PMAQI
18th Aug 2025407 PMAQI
18th Aug 2025358 PMAQI
18th Aug 2025319 PMAQI
18th Aug 20252910 PMAQI
18th Aug 20252611 PMAQI
19th Aug 20252312 AMAQI
19th Aug 2025231 AMAQI
19th Aug 2025232 AMAQI
19th Aug 2025243 AMAQI
19th Aug 2025254 AMAQI

25°C22/30°C

19th Aug 2025275 AMAQI
19th Aug 2025316 AMAQI
19th Aug 2025387 AMAQI
19th Aug 2025458 AMAQI
19th Aug 2025469 AMAQI
19th Aug 20254510 AMAQI
19th Aug 20254211 AMAQI
19th Aug 20254012 PMAQI
19th Aug 2025391 PMAQI
19th Aug 2025382 PMAQI
19th Aug 2025363 PMAQI
19th Aug 2025354 PMAQI
19th Aug 2025325 PMAQI
19th Aug 2025296 PMAQI
19th Aug 2025307 PMAQI
19th Aug 2025268 PMAQI
19th Aug 2025229 PMAQI
19th Aug 20252110 PMAQI
19th Aug 20252111 PMAQI
20th Aug 20252112 AMAQI
20th Aug 2025211 AMAQI
20th Aug 2025212 AMAQI
20th Aug 2025213 AMAQI
20th Aug 2025214 AMAQI

24°C22/25°C

20th Aug 2025215 AMAQI
20th Aug 2025226 AMAQI
20th Aug 2025217 AMAQI
20th Aug 2025218 AMAQI
20th Aug 2025209 AMAQI
20th Aug 20251810 AMAQI
20th Aug 20251811 AMAQI
20th Aug 20251812 PMAQI
20th Aug 2025171 PMAQI
20th Aug 2025182 PMAQI
20th Aug 2025173 PMAQI
20th Aug 2025174 PMAQI
20th Aug 2025165 PMAQI
20th Aug 2025156 PMAQI
20th Aug 2025197 PMAQI
20th Aug 2025188 PMAQI
20th Aug 2025179 PMAQI
20th Aug 20251610 PMAQI
20th Aug 20251711 PMAQI
21st Aug 20251712 AMAQI
21st Aug 2025181 AMAQI
21st Aug 2025172 AMAQI
21st Aug 2025183 AMAQI
21st Aug 2025184 AMAQI

22°C21/24°C

21st Aug 2025195 AMAQI
21st Aug 2025196 AMAQI
21st Aug 2025217 AMAQI
21st Aug 2025228 AMAQI
21st Aug 2025229 AMAQI
21st Aug 20252010 AMAQI
21st Aug 20251811 AMAQI
21st Aug 20251812 PMAQI
21st Aug 2025191 PMAQI
21st Aug 2025192 PMAQI
21st Aug 2025213 PMAQI
21st Aug 2025234 PMAQI
21st Aug 2025225 PMAQI
21st Aug 2025226 PMAQI
21st Aug 2025187 PMAQI
21st Aug 2025208 PMAQI
21st Aug 2025219 PMAQI
21st Aug 20252010 PMAQI
21st Aug 20252211 PMAQI
22nd Aug 20252312 AMAQI
22nd Aug 2025241 AMAQI
22nd Aug 2025252 AMAQI
22nd Aug 2025273 AMAQI
22nd Aug 2025294 AMAQI

22°C20/25°C

22nd Aug 2025305 AMAQI
22nd Aug 2025316 AMAQI
22nd Aug 2025357 AMAQI
22nd Aug 2025388 AMAQI
22nd Aug 2025409 AMAQI
22nd Aug 20253910 AMAQI
22nd Aug 20253711 AMAQI
22nd Aug 20253712 PMAQI
22nd Aug 2025381 PMAQI
22nd Aug 2025382 PMAQI
22nd Aug 2025413 PMAQI
22nd Aug 2025424 PMAQI
22nd Aug 2025455 PMAQI
22nd Aug 2025476 PMAQI
22nd Aug 2025337 PMAQI
22nd Aug 2025418 PMAQI
22nd Aug 2025499 PMAQI
22nd Aug 20255010 PMAQI
22nd Aug 20254611 PMAQI
23rd Aug 20254412 AMAQI
23rd Aug 2025421 AMAQI
23rd Aug 2025392 AMAQI
23rd Aug 2025383 AMAQI
23rd Aug 2025374 AMAQI

23°C18/27°C

23rd Aug 2025355 AMAQI
23rd Aug 2025356 AMAQI
23rd Aug 2025377 AMAQI
23rd Aug 2025388 AMAQI
23rd Aug 2025389 AMAQI
23rd Aug 20253810 AMAQI
23rd Aug 20253911 AMAQI
23rd Aug 20254112 PMAQI
23rd Aug 2025421 PMAQI
23rd Aug 2025422 PMAQI
23rd Aug 2025423 PMAQI
23rd Aug 2025394 PMAQI
23rd Aug 2025375 PMAQI
23rd Aug 2025346 PMAQI
23rd Aug 2025367 PMAQI
23rd Aug 2025338 PMAQI
23rd Aug 2025289 PMAQI
23rd Aug 20252710 PMAQI
23rd Aug 20252611 PMAQI
24th Aug 20252612 AMAQI
24th Aug 2025241 AMAQI
24th Aug 2025252 AMAQI
24th Aug 2025253 AMAQI
24th Aug 2025264 AMAQI

24°C19/31°C

24th Aug 2025275 AMAQI
24th Aug 2025276 AMAQI
24th Aug 2025267 AMAQI
24th Aug 2025268 AMAQI
24th Aug 2025259 AMAQI
24th Aug 20252510 AMAQI
24th Aug 20252311 AMAQI
24th Aug 20252212 PMAQI
24th Aug 2025211 PMAQI
24th Aug 2025202 PMAQI
24th Aug 2025193 PMAQI
24th Aug 2025204 PMAQI
24th Aug 2025205 PMAQI
24th Aug 2025206 PMAQI
24th Aug 2025247 PMAQI
24th Aug 2025218 PMAQI
24th Aug 2025219 PMAQI
24th Aug 20252210 PMAQI
24th Aug 20252211 PMAQI
25th Aug 20252012 AMAQI
25th Aug 2025201 AMAQI
25th Aug 2025192 AMAQI
25th Aug 2025183 AMAQI
25th Aug 2025184 AMAQI

19°C16/23°C

25th Aug 2025185 AMAQI
25th Aug 2025186 AMAQI
25th Aug 2025177 AMAQI
25th Aug 2025218 AMAQI
25th Aug 2025219 AMAQI
25th Aug 20252010 AMAQI
25th Aug 20252011 AMAQI
25th Aug 20251912 PMAQI
25th Aug 2025191 PMAQI
25th Aug 2025182 PMAQI
25th Aug 2025183 PMAQI
25th Aug 2025184 PMAQI
25th Aug 2025195 PMAQI
25th Aug 2025196 PMAQI
25th Aug 2025207 PMAQI
25th Aug 2025208 PMAQI
25th Aug 2025219 PMAQI
25th Aug 20252310 PMAQI
25th Aug 20252411 PMAQI
26th Aug 20253112 AMAQI
26th Aug 2025281 AMAQI
26th Aug 2025302 AMAQI
26th Aug 2025303 AMAQI
26th Aug 2025314 AMAQI

18°C14/21°C

26th Aug 2025325 AMAQI
26th Aug 2025326 AMAQI
26th Aug 2025357 AMAQI
26th Aug 2025378 AMAQI
26th Aug 2025339 AMAQI
26th Aug 20253310 AMAQI
26th Aug 20253511 AMAQI
26th Aug 20253412 PMAQI
26th Aug 2025291 PMAQI
26th Aug 2025262 PMAQI
26th Aug 2025253 PMAQI
26th Aug 2025244 PMAQI
26th Aug 2025235 PMAQI
26th Aug 2025236 PMAQI
26th Aug 2025287 PMAQI
26th Aug 2025268 PMAQI
26th Aug 2025279 PMAQI
26th Aug 20253010 PMAQI
26th Aug 20253411 PMAQI
27th Aug 20253612 AMAQI
27th Aug 2025421 AMAQI
27th Aug 2025422 AMAQI
27th Aug 2025443 AMAQI
27th Aug 2025424 AMAQI

19°C13/24°C

27th Aug 2025445 AMAQI
27th Aug 2025456 AMAQI
27th Aug 2025487 AMAQI
27th Aug 2025498 AMAQI
27th Aug 2025499 AMAQI
27th Aug 20254610 AMAQI
27th Aug 20254111 AMAQI
27th Aug 20253612 PMAQI
27th Aug 2025321 PMAQI
27th Aug 2025292 PMAQI
27th Aug 2025293 PMAQI
27th Aug 2025304 PMAQI
27th Aug 2025305 PMAQI
27th Aug 2025306 PMAQI
27th Aug 2025367 PMAQI
27th Aug 2025338 PMAQI
27th Aug 2025349 PMAQI
27th Aug 20253410 PMAQI
27th Aug 20253411 PMAQI
28th Aug 20253412 AMAQI
28th Aug 2025351 AMAQI
28th Aug 2025352 AMAQI
28th Aug 2025363 AMAQI
28th Aug 2025354 AMAQI

20°C13/25°C

28th Aug 2025345 AMAQI
28th Aug 2025356 AMAQI
28th Aug 2025377 AMAQI
28th Aug 2025378 AMAQI
28th Aug 2025349 AMAQI
28th Aug 20253510 AMAQI
28th Aug 20253711 AMAQI
28th Aug 20253912 PMAQI
28th Aug 2025401 PMAQI
28th Aug 2025442 PMAQI
28th Aug 2025413 PMAQI
28th Aug 2025394 PMAQI
28th Aug 2025395 PMAQI
28th Aug 2025396 PMAQI
28th Aug 2025357 PMAQI
28th Aug 2025368 PMAQI
28th Aug 2025369 PMAQI
28th Aug 20253610 PMAQI
28th Aug 20252911 PMAQI
29th Aug 20252412 AMAQI
29th Aug 2025211 AMAQI
29th Aug 2025192 AMAQI
29th Aug 2025203 AMAQI
29th Aug 2025194 AMAQI

20°C17/27°C

29th Aug 2025195 AMAQI
29th Aug 2025186 AMAQI
29th Aug 2025217 AMAQI
29th Aug 2025238 AMAQI
29th Aug 2025249 AMAQI
29th Aug 20252110 AMAQI
29th Aug 20251911 AMAQI
29th Aug 20251812 PMAQI
29th Aug 2025181 PMAQI
29th Aug 2025172 PMAQI
29th Aug 2025173 PMAQI
29th Aug 2025194 PMAQI
29th Aug 2025185 PMAQI
29th Aug 2025206 PMAQI
29th Aug 2025207 PMAQI
29th Aug 2025208 PMAQI
29th Aug 2025209 PMAQI
29th Aug 20252010 PMAQI
29th Aug 20252011 PMAQI
30th Aug 20252012 AMAQI
30th Aug 2025201 AMAQI
30th Aug 2025212 AMAQI
30th Aug 2025203 AMAQI
30th Aug 2025214 AMAQI

18°C16/21°C

30th Aug 2025245 AMAQI
5 AM
30th Aug 2025246 AMAQI
30th Aug 2025287 AMAQI
30th Aug 2025328 AMAQI
30th Aug 2025339 AMAQI
30th Aug 20253110 AMAQI
30th Aug 20253111 AMAQI
30th Aug 20253012 PMAQI
12 PM
30th Aug 2025311 PMAQI
30th Aug 2025322 PMAQI
7 PM
12 AM
4 AM

--°C/°C

Day time
Avg. Highest Time
8 AM - 7 PM

52AQI

12 hours / Day
360 hours / Month
Avg. Lowest Time
5 AM - 7 AM

51AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 8 AM to 7 PM (Avg. 52), while the lowest AQI was between 5 AM to 7 AM (Avg. 51).
Night time
Avg. Highest Time
12 AM - 11 PM

51AQI

9 hours / Day
270 hours / Month
Avg. Lowest Time
12 AM - 11 PM

51AQI

9 hours / Day
270 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 51), while the lowest AQI was between 12 AM to 11 PM (Avg. 51).

2025 Days Vs Air Quality

Chicago, Illinois, United States

2025

73%

134

27%

49

0.5%

1

Total number of days with different AQI categories in last 242 days in 2025 (123 days remaining)

Good
134 Days
Moderate
49 Days
Poor
1 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



Under WHO’s Safe Air Quality Limits: 73%

Health Risk Level:

Low

In 2025, 73% of 242 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.

Annual Air Quality Insights

Chicago, Illinois, United States

AQI levels in 2025

AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
2nd January 2025
3rd January 2025
4th January 2025
5th January 2025
6th January 2025
7th January 2025
8th January 2025
9th January 2025
10th January 2025
11th January 2025
12th January 2025
13th January 2025
14th January 2025
15th January 2025
16th January 2025
17th January 2025
18th January 2025
19th January 2025
20th January 2025
21st January 2025
22nd January 2025
23rd January 2025
24th January 2025
25th January 2025
26th January 2025
27th January 2025
28th January 2025
29th January 2025
30th January 2025
31st January 2025
1st February 2025
2nd February 2025
3rd February 2025
4th February 2025
5th February 2025
6th February 2025
7th February 2025
8th February 2025
9th February 2025
10th February 2025
11th February 2025
12th February 2025
13th February 2025
14th February 2025
15th February 2025
16th February 2025
17th February 2025
18th February 2025
19th February 2025
20th February 2025
21st February 2025
22nd February 2025
23rd February 2025
24th February 2025
25th February 2025
26th February 2025
27th February 2025
53AQI
28th February 2025
28AQI
1st March 2025
23AQI
2nd March 2025
25AQI
3rd March 2025
37AQI
4th March 2025
35AQI
5th March 2025
38AQI
6th March 2025
21AQI
7th March 2025
23AQI
8th March 2025
33AQI
9th March 2025
27AQI
10th March 2025
28AQI
11th March 2025
33AQI
12th March 2025
24AQI
13th March 2025
36AQI
14th March 2025
53AQI
15th March 2025
75AQI
16th March 2025
53AQI
17th March 2025
26AQI
18th March 2025
24AQI
19th March 2025
32AQI
20th March 2025
29AQI
21st March 2025
23AQI
22nd March 2025
22AQI
23rd March 2025
23AQI
24th March 2025
21AQI
25th March 2025
29AQI
26th March 2025
38AQI
27th March 2025
51AQI
28th March 2025
45AQI
29th March 2025
36AQI
30th March 2025
34AQI
31st March 2025
20AQI
1st April 2025
21AQI
2nd April 2025
36AQI
3rd April 2025
28AQI
4th April 2025
29AQI
5th April 2025
24AQI
6th April 2025
23AQI
7th April 2025
25AQI
8th April 2025
19AQI
9th April 2025
33AQI
10th April 2025
48AQI
11th April 2025
45AQI
12th April 2025
53AQI
13th April 2025
44AQI
14th April 2025
34AQI
15th April 2025
20AQI
16th April 2025
22AQI
17th April 2025
35AQI
18th April 2025
49AQI
19th April 2025
42AQI
20th April 2025
40AQI
21st April 2025
22AQI
22nd April 2025
31AQI
23rd April 2025
31AQI
24th April 2025
52AQI
25th April 2025
28AQI
26th April 2025
19AQI
27th April 2025
27AQI
28th April 2025
35AQI
29th April 2025
36AQI
30th April 2025
21AQI
1st May 2025
30AQI
2nd May 2025
28AQI
3rd May 2025
17AQI
4th May 2025
17AQI
5th May 2025
22AQI
6th May 2025
38AQI
7th May 2025
40AQI
8th May 2025
18AQI
9th May 2025
23AQI
10th May 2025
32AQI
11th May 2025
23AQI
12th May 2025
37AQI
13th May 2025
34AQI
14th May 2025
33AQI
15th May 2025
45AQI
16th May 2025
37AQI
17th May 2025
22AQI
18th May 2025
20AQI
19th May 2025
19AQI
20th May 2025
25AQI
21st May 2025
21AQI
22nd May 2025
15AQI
23rd May 2025
20AQI
24th May 2025
18AQI
25th May 2025
16AQI
26th May 2025
22AQI
27th May 2025
26AQI
28th May 2025
31AQI
29th May 2025
41AQI
30th May 2025
46AQI
31st May 2025
39AQI
1st June 2025
36AQI
2nd June 2025
42AQI
3rd June 2025
57AQI
4th June 2025
58AQI
5th June 2025
98AQI
6th June 2025
85AQI
7th June 2025
81AQI
8th June 2025
78AQI
9th June 2025
71AQI
10th June 2025
61AQI
11th June 2025
72AQI
12th June 2025
80AQI
13th June 2025
76AQI
14th June 2025
63AQI
15th June 2025
50AQI
16th June 2025
55AQI
17th June 2025
49AQI
18th June 2025
37AQI
19th June 2025
31AQI
20th June 2025
43AQI
21st June 2025
42AQI
22nd June 2025
46AQI
23rd June 2025
56AQI
24th June 2025
47AQI
25th June 2025
34AQI
26th June 2025
47AQI
27th June 2025
38AQI
28th June 2025
24AQI
29th June 2025
36AQI
30th June 2025
33AQI
1st July 2025
33AQI
2nd July 2025
54AQI
3rd July 2025
54AQI
4th July 2025
57AQI
5th July 2025
73AQI
6th July 2025
54AQI
7th July 2025
53AQI
8th July 2025
67AQI
9th July 2025
52AQI
10th July 2025
45AQI
11th July 2025
45AQI
12th July 2025
31AQI
13th July 2025
57AQI
14th July 2025
72AQI
15th July 2025
80AQI
16th July 2025
51AQI
17th July 2025
27AQI
18th July 2025
29AQI
19th July 2025
37AQI
20th July 2025
29AQI
21st July 2025
68AQI
22nd July 2025
78AQI
23rd July 2025
63AQI
24th July 2025
56AQI
25th July 2025
34AQI
26th July 2025
37AQI
27th July 2025
33AQI
28th July 2025
43AQI
29th July 2025
46AQI
30th July 2025
47AQI
31st July 2025
103AQI
1st August 2025
89AQI
2nd August 2025
73AQI
3rd August 2025
79AQI
4th August 2025
85AQI
5th August 2025
87AQI
6th August 2025
93AQI
7th August 2025
69AQI
8th August 2025
56AQI
9th August 2025
53AQI
10th August 2025
48AQI
11th August 2025
46AQI
12th August 2025
42AQI
13th August 2025
48AQI
14th August 2025
66AQI
15th August 2025
74AQI
16th August 2025
60AQI
17th August 2025
37AQI
18th August 2025
37AQI
19th August 2025
30AQI
20th August 2025
19AQI
21st August 2025
20AQI
22nd August 2025
36AQI
23rd August 2025
36AQI
24th August 2025
23AQI
25th August 2025
20AQI
26th August 2025
29AQI
27th August 2025
38AQI
28th August 2025
36AQI
29th August 2025
20AQI
30th August 2025
31st August 2025
1st September 2025
2nd September 2025
3rd September 2025
4th September 2025
5th September 2025
6th September 2025
7th September 2025
8th September 2025
9th September 2025
10th September 2025
11th September 2025
12th September 2025
13th September 2025
14th September 2025
15th September 2025
16th September 2025
17th September 2025
18th September 2025
19th September 2025
20th September 2025
21st September 2025
22nd September 2025
23rd September 2025
24th September 2025
25th September 2025
26th September 2025
27th September 2025
28th September 2025
29th September 2025
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025

41AQI

33AQI

32AQI

28AQI

54AQI

52AQI

50AQI


No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202541AQI

1
1
27
4
28
2
31
16
14
14
16
1
17
12
134
49
1

Highest AQI recorded in

June

54AQI


Lowest AQI recorded in

May

28AQI


Most & Least Polluted Years Over the Last 1 Years

Most Polluted Year Recorded
2025(Avg.)
41AQI
Least Polluted Year Recorded
2025(Avg.)
41AQI


Chicago's annual 2025 AQI (41) shows an average percentage change of NaN% (improved AQI) compared to previous years: .