Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

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 (31st August):
On this day, AQI across the 1 years varied significantly: 2026 ranks 1st highest AQI at 39 of Good air quality on the same day.

Day & Night AQI Trend: 31st Jul - 1st Aug 2026

Chicago, Illinois, United States

AQI
Day
Night
.

5 AM31st Jul 2026

8 PM

4 AM1st Aug 2026

Day time
Avg. Highest Time
7AM31st Jul

49AQI

Avg. Lowest Time
8PM31st Jul

34AQI

Night time
Avg. Highest Time
4AM1st Aug

42AQI

Avg. Lowest Time
11PM31st Jul

28AQI

In the last 24 hours,

Chicago's AQI reached its highest point of 49 at 7 AM during the Day, while the lowest point, 28, was recorded at 11 PM during the Night between 31st Jul and 1st Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Chicago, Illinois, United States

JulAug
03rd - 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 - 31st31st - 01st01st
Day
Night
3rd Jul 2026275 AMAQI
3rd Jul 2026216 AMAQI
3rd Jul 2026247 AMAQI
3rd Jul 2026208 AMAQI
3rd Jul 2026209 AMAQI
3rd Jul 20262110 AMAQI
3rd Jul 20262711 AMAQI
3rd Jul 20262912 PMAQI
3rd Jul 2026231 PMAQI
3rd Jul 2026202 PMAQI
3rd Jul 2026213 PMAQI
3rd Jul 2026234 PMAQI
3rd Jul 2026175 PMAQI
3rd Jul 2026256 PMAQI
3rd Jul 2026227 PMAQI
3rd Jul 2026228 PMAQI
3rd Jul 2026219 PMAQI
3rd Jul 20262610 PMAQI
3rd Jul 20262911 PMAQI
4th Jul 20262712 AMAQI
4th Jul 2026301 AMAQI
4th Jul 2026392 AMAQI
4th Jul 2026303 AMAQI
4th Jul 2026124 AMAQI

26°C21/34°C

4th Jul 2026255 AMAQI
4th Jul 2026246 AMAQI
4th Jul 2026237 AMAQI
4th Jul 2026428 AMAQI
4th Jul 2026239 AMAQI
4th Jul 20262510 AMAQI
4th Jul 20264111 AMAQI
4th Jul 20262712 PMAQI
4th Jul 2026271 PMAQI
4th Jul 2026262 PMAQI
4th Jul 2026343 PMAQI
4th Jul 2026244 PMAQI
4th Jul 2026365 PMAQI
4th Jul 2026236 PMAQI
4th Jul 2026257 PMAQI
4th Jul 2026218 PMAQI
4th Jul 2026269 PMAQI
4th Jul 20263210 PMAQI
4th Jul 20267911 PMAQI
5th Jul 20266112 AMAQI
5th Jul 2026391 AMAQI
5th Jul 2026472 AMAQI
5th Jul 2026403 AMAQI
5th Jul 2026454 AMAQI

23°C20/28°C

5th Jul 2026315 AMAQI
5th Jul 2026446 AMAQI
5th Jul 2026267 AMAQI
5th Jul 2026438 AMAQI
5th Jul 2026439 AMAQI
5th Jul 20265510 AMAQI
5th Jul 20264911 AMAQI
5th Jul 20263212 PMAQI
5th Jul 2026551 PMAQI
5th Jul 2026452 PMAQI
5th Jul 2026563 PMAQI
5th Jul 2026444 PMAQI
5th Jul 2026475 PMAQI
5th Jul 2026426 PMAQI
5th Jul 2026477 PMAQI
5th Jul 2026458 PMAQI
5th Jul 2026309 PMAQI
5th Jul 20263510 PMAQI
5th Jul 20263211 PMAQI
6th Jul 20263412 AMAQI
6th Jul 2026291 AMAQI
6th Jul 2026492 AMAQI
6th Jul 2026453 AMAQI
6th Jul 2026464 AMAQI

21°C19/23°C

6th Jul 2026495 AMAQI
6th Jul 2026296 AMAQI
6th Jul 2026467 AMAQI
6th Jul 2026398 AMAQI
6th Jul 2026409 AMAQI
6th Jul 20262710 AMAQI
6th Jul 20263911 AMAQI
6th Jul 20263912 PMAQI
6th Jul 2026461 PMAQI
6th Jul 2026432 PMAQI
6th Jul 2026433 PMAQI
6th Jul 2026424 PMAQI
6th Jul 2026355 PMAQI
6th Jul 2026386 PMAQI
6th Jul 2026257 PMAQI
6th Jul 2026348 PMAQI
6th Jul 2026329 PMAQI
6th Jul 20263610 PMAQI
6th Jul 20264011 PMAQI
7th Jul 20263212 AMAQI
7th Jul 2026391 AMAQI
7th Jul 2026522 AMAQI
7th Jul 2026343 AMAQI
7th Jul 2026274 AMAQI

21°C19/25°C

7th Jul 2026415 AMAQI
7th Jul 2026376 AMAQI
7th Jul 2026367 AMAQI
7th Jul 2026338 AMAQI
7th Jul 2026339 AMAQI
7th Jul 20263410 AMAQI
7th Jul 20263111 AMAQI
7th Jul 20263412 PMAQI
7th Jul 2026411 PMAQI
7th Jul 2026372 PMAQI
7th Jul 2026313 PMAQI
7th Jul 2026394 PMAQI
7th Jul 2026435 PMAQI
7th Jul 2026386 PMAQI
7th Jul 2026337 PMAQI
7th Jul 2026378 PMAQI
7th Jul 2026419 PMAQI
7th Jul 20264110 PMAQI
7th Jul 20263111 PMAQI
8th Jul 20264112 AMAQI
8th Jul 2026441 AMAQI
8th Jul 2026402 AMAQI
8th Jul 2026413 AMAQI
8th Jul 2026444 AMAQI

23°C17/27°C

8th Jul 2026415 AMAQI
8th Jul 2026406 AMAQI
8th Jul 2026417 AMAQI
8th Jul 2026428 AMAQI
8th Jul 2026409 AMAQI
8th Jul 20263310 AMAQI
8th Jul 20263511 AMAQI
8th Jul 20263212 PMAQI
8th Jul 2026321 PMAQI
8th Jul 2026322 PMAQI
8th Jul 2026293 PMAQI
8th Jul 2026414 PMAQI
8th Jul 2026415 PMAQI
8th Jul 2026346 PMAQI
8th Jul 2026357 PMAQI
8th Jul 2026348 PMAQI
8th Jul 2026339 PMAQI
8th Jul 20263310 PMAQI
8th Jul 20263611 PMAQI
9th Jul 20263212 AMAQI
9th Jul 2026401 AMAQI
9th Jul 2026372 AMAQI
9th Jul 2026473 AMAQI
9th Jul 2026284 AMAQI

25°C18/33°C

9th Jul 2026205 AMAQI
9th Jul 2026256 AMAQI
9th Jul 2026397 AMAQI
9th Jul 2026298 AMAQI
9th Jul 2026369 AMAQI
9th Jul 20263110 AMAQI
9th Jul 20263011 AMAQI
9th Jul 20262812 PMAQI
9th Jul 2026351 PMAQI
9th Jul 2026312 PMAQI
9th Jul 2026293 PMAQI
9th Jul 2026204 PMAQI
9th Jul 2026255 PMAQI
9th Jul 2026256 PMAQI
9th Jul 2026257 PMAQI
9th Jul 2026218 PMAQI
9th Jul 2026239 PMAQI
9th Jul 20262010 PMAQI
9th Jul 20261911 PMAQI
10th Jul 20262212 AMAQI
10th Jul 2026211 AMAQI
10th Jul 2026202 AMAQI
10th Jul 2026133 AMAQI
10th Jul 2026334 AMAQI

26°C22/32°C

10th Jul 2026325 AMAQI
10th Jul 2026356 AMAQI
10th Jul 2026207 AMAQI
10th Jul 2026308 AMAQI
10th Jul 2026209 AMAQI
10th Jul 20261910 AMAQI
10th Jul 20261811 AMAQI
10th Jul 20262012 PMAQI
10th Jul 2026171 PMAQI
10th Jul 2026192 PMAQI
10th Jul 2026233 PMAQI
10th Jul 2026244 PMAQI
10th Jul 2026365 PMAQI
10th Jul 2026296 PMAQI
10th Jul 2026317 PMAQI
10th Jul 2026268 PMAQI
10th Jul 2026269 PMAQI
10th Jul 20263010 PMAQI
10th Jul 20262711 PMAQI
11th Jul 20263512 AMAQI
11th Jul 2026311 AMAQI
11th Jul 2026352 AMAQI
11th Jul 2026633 AMAQI
11th Jul 2026524 AMAQI

24°C21/28°C

11th Jul 2026515 AMAQI
11th Jul 2026436 AMAQI
11th Jul 2026437 AMAQI
11th Jul 2026438 AMAQI
11th Jul 2026409 AMAQI
11th Jul 20263910 AMAQI
11th Jul 20263811 AMAQI
11th Jul 20264112 PMAQI
11th Jul 2026381 PMAQI
11th Jul 2026332 PMAQI
11th Jul 2026253 PMAQI
11th Jul 2026284 PMAQI
11th Jul 2026295 PMAQI
11th Jul 2026266 PMAQI
11th Jul 2026317 PMAQI
11th Jul 2026408 PMAQI
11th Jul 2026409 PMAQI
11th Jul 20264610 PMAQI
11th Jul 20262811 PMAQI
12th Jul 20264112 AMAQI
12th Jul 2026321 AMAQI
12th Jul 2026272 AMAQI
12th Jul 2026343 AMAQI
12th Jul 2026274 AMAQI

24°C20/28°C

12th Jul 2026415 AMAQI
12th Jul 2026396 AMAQI
12th Jul 2026417 AMAQI
12th Jul 2026378 AMAQI
12th Jul 2026449 AMAQI
12th Jul 20264910 AMAQI
12th Jul 20264811 AMAQI
12th Jul 20264412 PMAQI
12th Jul 2026371 PMAQI
12th Jul 2026322 PMAQI
12th Jul 2026363 PMAQI
12th Jul 2026494 PMAQI
12th Jul 2026485 PMAQI
12th Jul 2026436 PMAQI
12th Jul 2026377 PMAQI
12th Jul 2026388 PMAQI
12th Jul 2026419 PMAQI
12th Jul 20264310 PMAQI
12th Jul 20264311 PMAQI
13th Jul 20264812 AMAQI
13th Jul 2026421 AMAQI
13th Jul 2026442 AMAQI
13th Jul 2026473 AMAQI
13th Jul 2026474 AMAQI

25°C22/30°C

13th Jul 2026455 AMAQI
13th Jul 2026496 AMAQI
13th Jul 2026447 AMAQI
13th Jul 2026408 AMAQI
13th Jul 2026399 AMAQI
13th Jul 20265110 AMAQI
13th Jul 20264811 AMAQI
13th Jul 20264712 PMAQI
13th Jul 2026351 PMAQI
13th Jul 2026402 PMAQI
13th Jul 2026323 PMAQI
13th Jul 2026364 PMAQI
13th Jul 2026375 PMAQI
13th Jul 2026386 PMAQI
13th Jul 2026467 PMAQI
13th Jul 2026428 PMAQI
13th Jul 2026449 PMAQI
13th Jul 20264410 PMAQI
13th Jul 20264011 PMAQI
14th Jul 20263312 AMAQI
14th Jul 2026481 AMAQI
14th Jul 2026472 AMAQI
14th Jul 2026463 AMAQI
14th Jul 2026474 AMAQI

26°C19/33°C

14th Jul 2026355 AMAQI
14th Jul 2026336 AMAQI
14th Jul 2026357 AMAQI
14th Jul 2026368 AMAQI
14th Jul 2026369 AMAQI
14th Jul 20263610 AMAQI
14th Jul 20263311 AMAQI
14th Jul 20264312 PMAQI
14th Jul 2026351 PMAQI
14th Jul 2026382 PMAQI
14th Jul 2026353 PMAQI
14th Jul 2026284 PMAQI
14th Jul 2026325 PMAQI
14th Jul 2026366 PMAQI
14th Jul 2026387 PMAQI
14th Jul 2026318 PMAQI
14th Jul 2026279 PMAQI
14th Jul 20262710 PMAQI
14th Jul 20262511 PMAQI
15th Jul 20262312 AMAQI
15th Jul 2026381 AMAQI
15th Jul 2026822 AMAQI
15th Jul 2026393 AMAQI
15th Jul 2026264 AMAQI

29°C22/36°C

15th Jul 2026305 AMAQI
15th Jul 2026316 AMAQI
15th Jul 2026767 AMAQI
15th Jul 2026288 AMAQI
15th Jul 2026429 AMAQI
15th Jul 20264010 AMAQI
15th Jul 20263911 AMAQI
15th Jul 20264512 PMAQI
15th Jul 2026511 PMAQI
15th Jul 2026492 PMAQI
15th Jul 2026403 PMAQI
15th Jul 2026394 PMAQI
15th Jul 2026295 PMAQI
15th Jul 2026496 PMAQI
15th Jul 2026397 PMAQI
15th Jul 2026418 PMAQI
15th Jul 2026679 PMAQI
15th Jul 20269510 PMAQI
15th Jul 20269211 PMAQI
16th Jul 202611012 AMAQI
16th Jul 2026401 AMAQI
16th Jul 2026522 AMAQI
16th Jul 2026413 AMAQI
16th Jul 2026804 AMAQI

29°C24/37°C

16th Jul 2026935 AMAQI
16th Jul 20261766 AMAQI
16th Jul 20261307 AMAQI
16th Jul 20261628 AMAQI
16th Jul 20261019 AMAQI
16th Jul 20266710 AMAQI
16th Jul 20266211 AMAQI
16th Jul 202621112 PMAQI
16th Jul 2026541 PMAQI
16th Jul 20261292 PMAQI
16th Jul 20261273 PMAQI
16th Jul 20261194 PMAQI
16th Jul 20261515 PMAQI
16th Jul 2026746 PMAQI
16th Jul 20261227 PMAQI
16th Jul 2026518 PMAQI
16th Jul 2026509 PMAQI
16th Jul 20269810 PMAQI
16th Jul 202613711 PMAQI
17th Jul 202610312 AMAQI
17th Jul 2026681 AMAQI
17th Jul 20261862 AMAQI
17th Jul 20262303 AMAQI
17th Jul 20262754 AMAQI

27°C25/29°C

17th Jul 20262655 AMAQI
17th Jul 20262706 AMAQI
17th Jul 20262587 AMAQI
17th Jul 20262528 AMAQI
17th Jul 20262529 AMAQI
17th Jul 202624310 AMAQI
17th Jul 202621811 AMAQI
17th Jul 202619912 PMAQI
17th Jul 20261221 PMAQI
17th Jul 20261832 PMAQI
17th Jul 20261853 PMAQI
17th Jul 20261524 PMAQI
17th Jul 20261295 PMAQI
17th Jul 20261126 PMAQI
17th Jul 20261067 PMAQI
17th Jul 2026978 PMAQI
17th Jul 2026939 PMAQI
17th Jul 20268510 PMAQI
17th Jul 20267811 PMAQI
18th Jul 20267212 AMAQI
18th Jul 2026711 AMAQI
18th Jul 2026682 AMAQI
18th Jul 2026623 AMAQI
18th Jul 2026564 AMAQI

28°C23/34°C

18th Jul 2026535 AMAQI
18th Jul 2026506 AMAQI
18th Jul 2026507 AMAQI
18th Jul 2026478 AMAQI
18th Jul 2026479 AMAQI
18th Jul 20264710 AMAQI
18th Jul 20264611 AMAQI
18th Jul 20264512 PMAQI
18th Jul 2026451 PMAQI
18th Jul 2026442 PMAQI
18th Jul 2026433 PMAQI
18th Jul 2026484 PMAQI
18th Jul 2026485 PMAQI
18th Jul 2026506 PMAQI
18th Jul 2026697 PMAQI
18th Jul 2026948 PMAQI
18th Jul 20261199 PMAQI
18th Jul 202613210 PMAQI
18th Jul 202613411 PMAQI
19th Jul 202614312 AMAQI
19th Jul 20261471 AMAQI
19th Jul 20261392 AMAQI
19th Jul 20261413 AMAQI
19th Jul 20261334 AMAQI

26°C22/32°C

19th Jul 20261285 AMAQI
19th Jul 20261296 AMAQI
19th Jul 20261387 AMAQI
19th Jul 20261388 AMAQI
19th Jul 20261429 AMAQI
19th Jul 202612910 AMAQI
19th Jul 202613011 AMAQI
19th Jul 202612612 PMAQI
19th Jul 20261231 PMAQI
19th Jul 20261232 PMAQI
19th Jul 20261253 PMAQI
19th Jul 20261214 PMAQI
19th Jul 20261205 PMAQI
19th Jul 20261216 PMAQI
19th Jul 20261217 PMAQI
19th Jul 20261228 PMAQI
19th Jul 20261229 PMAQI
19th Jul 202611910 PMAQI
19th Jul 202612011 PMAQI
20th Jul 202612212 AMAQI
20th Jul 20261201 AMAQI
20th Jul 20261242 AMAQI
20th Jul 20261303 AMAQI
20th Jul 20261304 AMAQI

23°C20/28°C

20th Jul 20261275 AMAQI
20th Jul 20261256 AMAQI
20th Jul 20261247 AMAQI
20th Jul 20261328 AMAQI
20th Jul 20261289 AMAQI
20th Jul 202612710 AMAQI
20th Jul 202612111 AMAQI
20th Jul 202611812 PMAQI
20th Jul 20261161 PMAQI
20th Jul 20261132 PMAQI
20th Jul 20261183 PMAQI
20th Jul 20261144 PMAQI
20th Jul 20261145 PMAQI
20th Jul 20261146 PMAQI
20th Jul 20261157 PMAQI
20th Jul 20261188 PMAQI
20th Jul 20261199 PMAQI
20th Jul 202610810 PMAQI
20th Jul 202611611 PMAQI
21st Jul 202611412 AMAQI
21st Jul 20261071 AMAQI
21st Jul 20261052 AMAQI
21st Jul 2026953 AMAQI
21st Jul 2026864 AMAQI

24°C18/32°C

21st Jul 2026755 AMAQI
21st Jul 2026666 AMAQI
21st Jul 2026647 AMAQI
21st Jul 2026588 AMAQI
21st Jul 2026409 AMAQI
21st Jul 20264710 AMAQI
21st Jul 20265711 AMAQI
21st Jul 20266112 PMAQI
21st Jul 2026641 PMAQI
21st Jul 2026632 PMAQI
21st Jul 2026603 PMAQI
21st Jul 2026564 PMAQI
21st Jul 2026495 PMAQI
21st Jul 2026506 PMAQI
21st Jul 2026457 PMAQI
21st Jul 2026428 PMAQI
21st Jul 2026349 PMAQI
21st Jul 20264110 PMAQI
21st Jul 20264111 PMAQI
22nd Jul 20264112 AMAQI
22nd Jul 2026481 AMAQI
22nd Jul 2026462 AMAQI
22nd Jul 2026403 AMAQI
22nd Jul 2026344 AMAQI

26°C20/32°C

22nd Jul 2026495 AMAQI
22nd Jul 2026406 AMAQI
22nd Jul 2026387 AMAQI
22nd Jul 2026288 AMAQI
22nd Jul 2026319 AMAQI
22nd Jul 20262710 AMAQI
22nd Jul 20261811 AMAQI
22nd Jul 20263212 PMAQI
22nd Jul 2026221 PMAQI
22nd Jul 2026232 PMAQI
22nd Jul 2026203 PMAQI
22nd Jul 2026294 PMAQI
22nd Jul 2026275 PMAQI
22nd Jul 2026296 PMAQI
22nd Jul 2026307 PMAQI
22nd Jul 2026298 PMAQI
22nd Jul 2026529 PMAQI
22nd Jul 20264010 PMAQI
22nd Jul 20263211 PMAQI
23rd Jul 20263412 AMAQI
23rd Jul 2026321 AMAQI
23rd Jul 2026402 AMAQI
23rd Jul 2026363 AMAQI
23rd Jul 2026294 AMAQI

20°C16/25°C

23rd Jul 2026345 AMAQI
23rd Jul 2026356 AMAQI
23rd Jul 2026387 AMAQI
23rd Jul 2026488 AMAQI
23rd Jul 2026469 AMAQI
23rd Jul 20264410 AMAQI
23rd Jul 20263711 AMAQI
23rd Jul 20262812 PMAQI
23rd Jul 2026531 PMAQI
23rd Jul 2026442 PMAQI
23rd Jul 2026313 PMAQI
23rd Jul 2026354 PMAQI
23rd Jul 2026445 PMAQI
23rd Jul 2026436 PMAQI
23rd Jul 2026427 PMAQI
23rd Jul 2026438 PMAQI
23rd Jul 2026309 PMAQI
23rd Jul 20263010 PMAQI
23rd Jul 20263511 PMAQI
24th Jul 20264712 AMAQI
24th Jul 2026471 AMAQI
24th Jul 2026442 AMAQI
24th Jul 2026453 AMAQI
24th Jul 2026454 AMAQI

20°C14/27°C

24th Jul 2026485 AMAQI
24th Jul 2026466 AMAQI
24th Jul 2026447 AMAQI
24th Jul 2026428 AMAQI
24th Jul 2026469 AMAQI
24th Jul 20264510 AMAQI
24th Jul 20264611 AMAQI
24th Jul 20264812 PMAQI
24th Jul 2026491 PMAQI
24th Jul 2026482 PMAQI
24th Jul 2026323 PMAQI
24th Jul 2026334 PMAQI
24th Jul 2026395 PMAQI
24th Jul 2026376 PMAQI
24th Jul 2026347 PMAQI
24th Jul 2026328 PMAQI
24th Jul 2026369 PMAQI
24th Jul 20263610 PMAQI
24th Jul 20263411 PMAQI
25th Jul 20265412 AMAQI
25th Jul 2026481 AMAQI
25th Jul 2026442 AMAQI
25th Jul 2026433 AMAQI
25th Jul 2026394 AMAQI

21°C16/27°C

25th Jul 2026385 AMAQI
25th Jul 2026316 AMAQI
25th Jul 2026397 AMAQI
25th Jul 2026458 AMAQI
25th Jul 2026459 AMAQI
25th Jul 20264110 AMAQI
25th Jul 20262911 AMAQI
25th Jul 20263912 PMAQI
25th Jul 2026401 PMAQI
25th Jul 2026392 PMAQI
25th Jul 2026403 PMAQI
25th Jul 2026444 PMAQI
25th Jul 2026465 PMAQI
25th Jul 2026446 PMAQI
25th Jul 2026497 PMAQI
25th Jul 2026498 PMAQI
25th Jul 2026489 PMAQI
25th Jul 20264310 PMAQI
25th Jul 20264511 PMAQI
26th Jul 20264712 AMAQI
26th Jul 2026471 AMAQI
26th Jul 2026432 AMAQI
26th Jul 2026453 AMAQI
26th Jul 2026454 AMAQI

23°C17/31°C

26th Jul 2026475 AMAQI
26th Jul 2026486 AMAQI
26th Jul 2026487 AMAQI
26th Jul 2026468 AMAQI
26th Jul 2026469 AMAQI
26th Jul 20264810 AMAQI
26th Jul 20264811 AMAQI
26th Jul 20264812 PMAQI
26th Jul 2026491 PMAQI
26th Jul 2026532 PMAQI
26th Jul 2026543 PMAQI
26th Jul 2026564 PMAQI
26th Jul 2026555 PMAQI
26th Jul 2026566 PMAQI
26th Jul 2026557 PMAQI
26th Jul 2026548 PMAQI
26th Jul 2026559 PMAQI
26th Jul 20265410 PMAQI
26th Jul 20265311 PMAQI
27th Jul 20265312 AMAQI
27th Jul 2026531 AMAQI
27th Jul 2026532 AMAQI
27th Jul 2026533 AMAQI
27th Jul 2026534 AMAQI

26°C21/33°C

27th Jul 2026555 AMAQI
27th Jul 2026566 AMAQI
27th Jul 2026587 AMAQI
27th Jul 2026608 AMAQI
27th Jul 2026629 AMAQI
27th Jul 20266010 AMAQI
27th Jul 20265811 AMAQI
27th Jul 20265812 PMAQI
27th Jul 2026571 PMAQI
27th Jul 2026552 PMAQI
27th Jul 2026513 PMAQI
27th Jul 2026484 PMAQI
27th Jul 2026415 PMAQI
27th Jul 2026416 PMAQI
27th Jul 2026407 PMAQI
27th Jul 2026468 PMAQI
27th Jul 2026469 PMAQI
27th Jul 20263710 PMAQI
27th Jul 20264511 PMAQI
28th Jul 20264812 AMAQI
28th Jul 2026501 AMAQI
28th Jul 2026472 AMAQI
28th Jul 2026473 AMAQI
28th Jul 2026434 AMAQI

25°C22/30°C

28th Jul 2026435 AMAQI
28th Jul 2026426 AMAQI
28th Jul 2026437 AMAQI
28th Jul 2026438 AMAQI
28th Jul 2026409 AMAQI
28th Jul 20264310 AMAQI
28th Jul 20264811 AMAQI
28th Jul 20264912 PMAQI
28th Jul 2026511 PMAQI
28th Jul 2026512 PMAQI
28th Jul 2026513 PMAQI
28th Jul 2026494 PMAQI
28th Jul 2026465 PMAQI
28th Jul 2026446 PMAQI
28th Jul 2026427 PMAQI
28th Jul 2026378 PMAQI
28th Jul 2026309 PMAQI
28th Jul 20264010 PMAQI
28th Jul 20263711 PMAQI
29th Jul 20264512 AMAQI
29th Jul 2026421 AMAQI
29th Jul 2026382 AMAQI
29th Jul 2026373 AMAQI
29th Jul 2026324 AMAQI

21°C19/24°C

29th Jul 2026385 AMAQI
29th Jul 2026396 AMAQI
29th Jul 2026417 AMAQI
29th Jul 2026278 AMAQI
29th Jul 2026309 AMAQI
29th Jul 20263310 AMAQI
29th Jul 20264011 AMAQI
29th Jul 20262812 PMAQI
29th Jul 2026301 PMAQI
29th Jul 2026392 PMAQI
29th Jul 2026333 PMAQI
29th Jul 2026344 PMAQI
29th Jul 2026295 PMAQI
29th Jul 2026396 PMAQI
29th Jul 2026247 PMAQI
29th Jul 2026258 PMAQI
29th Jul 2026409 PMAQI
29th Jul 20264410 PMAQI
29th Jul 20263111 PMAQI
30th Jul 20264212 AMAQI
30th Jul 2026301 AMAQI
30th Jul 2026292 AMAQI
30th Jul 2026443 AMAQI
30th Jul 2026424 AMAQI

21°C17/26°C

30th Jul 2026435 AMAQI
30th Jul 2026296 AMAQI
30th Jul 2026337 AMAQI
30th Jul 2026438 AMAQI
30th Jul 2026469 AMAQI
30th Jul 20264010 AMAQI
30th Jul 20264411 AMAQI
30th Jul 20263112 PMAQI
30th Jul 2026301 PMAQI
30th Jul 2026352 PMAQI
30th Jul 2026363 PMAQI
30th Jul 2026424 PMAQI
30th Jul 2026385 PMAQI
30th Jul 2026406 PMAQI
30th Jul 2026417 PMAQI
30th Jul 2026468 PMAQI
30th Jul 2026469 PMAQI
30th Jul 20264510 PMAQI
30th Jul 20264511 PMAQI
31st Jul 20264912 AMAQI
31st Jul 2026451 AMAQI
31st Jul 2026492 AMAQI
31st Jul 2026473 AMAQI
31st Jul 2026474 AMAQI

24°C16/31°C

31st Jul 2026485 AMAQI
31st Jul 2026476 AMAQI
31st Jul 2026497 AMAQI
31st Jul 2026488 AMAQI
31st Jul 2026479 AMAQI
31st Jul 20264610 AMAQI
31st Jul 20264711 AMAQI
31st Jul 20264612 PMAQI
31st Jul 2026441 PMAQI
31st Jul 2026462 PMAQI
31st Jul 2026463 PMAQI
31st Jul 2026454 PMAQI
31st Jul 2026445 PMAQI
31st Jul 2026406 PMAQI
31st Jul 2026347 PMAQI
31st Jul 2026348 PMAQI
31st Jul 2026289 PMAQI
31st Jul 20263810 PMAQI
31st Jul 20262811 PMAQI
1st Aug 20263012 AMAQI
1st Aug 2026391 AMAQI
1st Aug 2026322 AMAQI
1st Aug 2026413 AMAQI
1st Aug 2026424 AMAQI

23°C19/30°C

1st Aug 2026425 AMAQI
5 AM
1st Aug 2026416 AMAQI
1st Aug 2026417 AMAQI
1st Aug 2026428 AMAQI
1st Aug 2026439 AMAQI
1st Aug 20263810 AMAQI
1st Aug 20263811 AMAQI
1st Aug 20264012 PMAQI
12 PM
1st Aug 2026411 PMAQI
1st Aug 2026462 PMAQI
1st Aug 2026463 PMAQI
1st Aug 2026484 PMAQI
1st Aug 2026465 PMAQI
1st Aug 2026466 PMAQI
1st Aug 2026467 PMAQI
1st Aug 2026448 PMAQI
8 PM
1st Aug 2026429 PMAQI
1st Aug 20264510 PMAQI
1st Aug 20264311 PMAQI
12 AM
4 AM

22°C20/24°C

Day time
Avg. Highest Time
5 AM - 8 AM

57AQI

4 hours / Day
120 hours / Month
Avg. Lowest Time
6 PM - 8 PM

48AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 AM (Avg. 57), while the lowest AQI was between 6 PM to 8 PM (Avg. 48).
Night time
Avg. Highest Time
2 AM - 4 AM

56AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
9 PM

48AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 2 AM to 4 AM (Avg. 56), while the lowest AQI was between 9 PM to 9 PM (Avg. 48).

2026 Days Vs Air Quality

Chicago, Illinois, United States

2026

92%

192

6%

13

1%

3

0.4%

1

Total number of days with different AQI categories in last 213 days in 2026 (152 days remaining)

Good
192 Days
Moderate
13 Days
Poor
3 Days
Unhealthy
1 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 92%

Health Risk Level:

Very Low

In 2026, 92% of 213 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.

Annual Air Quality Insights

Chicago, Illinois, United States

AQI levels in 2026

AQI (US)
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 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
19AQI (US)
2nd January 2026
27AQI (US)
3rd January 2026
31AQI (US)
4th January 2026
32AQI (US)
5th January 2026
47AQI (US)
6th January 2026
70AQI (US)
7th January 2026
56AQI (US)
8th January 2026
48AQI (US)
9th January 2026
25AQI (US)
10th January 2026
28AQI (US)
11th January 2026
22AQI (US)
12th January 2026
21AQI (US)
13th January 2026
27AQI (US)
14th January 2026
16AQI (US)
15th January 2026
14AQI (US)
16th January 2026
22AQI (US)
17th January 2026
18AQI (US)
18th January 2026
18AQI (US)
19th January 2026
20AQI (US)
20th January 2026
22AQI (US)
21st January 2026
34AQI (US)
22nd January 2026
53AQI (US)
23rd January 2026
56AQI (US)
24th January 2026
46AQI (US)
25th January 2026
49AQI (US)
26th January 2026
46AQI (US)
27th January 2026
35AQI (US)
28th January 2026
39AQI (US)
29th January 2026
45AQI (US)
30th January 2026
58AQI (US)
31st January 2026
43AQI (US)
1st February 2026
44AQI (US)
2nd February 2026
49AQI (US)
3rd February 2026
46AQI (US)
4th February 2026
43AQI (US)
5th February 2026
49AQI (US)
6th February 2026
45AQI (US)
7th February 2026
39AQI (US)
8th February 2026
41AQI (US)
9th February 2026
47AQI (US)
10th February 2026
44AQI (US)
11th February 2026
37AQI (US)
12th February 2026
35AQI (US)
13th February 2026
43AQI (US)
14th February 2026
46AQI (US)
15th February 2026
47AQI (US)
16th February 2026
42AQI (US)
17th February 2026
45AQI (US)
18th February 2026
43AQI (US)
19th February 2026
38AQI (US)
20th February 2026
37AQI (US)
21st February 2026
35AQI (US)
22nd February 2026
35AQI (US)
23rd February 2026
38AQI (US)
24th February 2026
40AQI (US)
25th February 2026
38AQI (US)
26th February 2026
33AQI (US)
27th February 2026
32AQI (US)
28th February 2026
34AQI (US)
1st March 2026
38AQI (US)
2nd March 2026
54AQI (US)
3rd March 2026
40AQI (US)
4th March 2026
43AQI (US)
5th March 2026
43AQI (US)
6th March 2026
37AQI (US)
7th March 2026
35AQI (US)
8th March 2026
40AQI (US)
9th March 2026
36AQI (US)
10th March 2026
33AQI (US)
11th March 2026
41AQI (US)
12th March 2026
38AQI (US)
13th March 2026
39AQI (US)
14th March 2026
36AQI (US)
15th March 2026
30AQI (US)
16th March 2026
36AQI (US)
17th March 2026
33AQI (US)
18th March 2026
29AQI (US)
19th March 2026
38AQI (US)
20th March 2026
40AQI (US)
21st March 2026
39AQI (US)
22nd March 2026
34AQI (US)
23rd March 2026
39AQI (US)
24th March 2026
32AQI (US)
25th March 2026
31AQI (US)
26th March 2026
33AQI (US)
27th March 2026
29AQI (US)
28th March 2026
29AQI (US)
29th March 2026
28AQI (US)
30th March 2026
27AQI (US)
31st March 2026
27AQI (US)
1st April 2026
29AQI (US)
2nd April 2026
26AQI (US)
3rd April 2026
28AQI (US)
4th April 2026
29AQI (US)
5th April 2026
31AQI (US)
6th April 2026
31AQI (US)
7th April 2026
28AQI (US)
8th April 2026
32AQI (US)
9th April 2026
27AQI (US)
10th April 2026
32AQI (US)
11th April 2026
29AQI (US)
12th April 2026
27AQI (US)
13th April 2026
29AQI (US)
14th April 2026
29AQI (US)
15th April 2026
31AQI (US)
16th April 2026
29AQI (US)
17th April 2026
18th April 2026
28AQI (US)
19th April 2026
32AQI (US)
20th April 2026
27AQI (US)
21st April 2026
23AQI (US)
22nd April 2026
23rd April 2026
24AQI (US)
24th April 2026
25AQI (US)
25th April 2026
27AQI (US)
26th April 2026
33AQI (US)
27th April 2026
23AQI (US)
28th April 2026
24AQI (US)
29th April 2026
24AQI (US)
30th April 2026
26AQI (US)
1st May 2026
25AQI (US)
2nd May 2026
24AQI (US)
3rd May 2026
22AQI (US)
4th May 2026
33AQI (US)
5th May 2026
37AQI (US)
6th May 2026
29AQI (US)
7th May 2026
26AQI (US)
8th May 2026
31AQI (US)
9th May 2026
10th May 2026
31AQI (US)
11th May 2026
29AQI (US)
12th May 2026
25AQI (US)
13th May 2026
27AQI (US)
14th May 2026
25AQI (US)
15th May 2026
38AQI (US)
16th May 2026
50AQI (US)
17th May 2026
51AQI (US)
18th May 2026
56AQI (US)
19th May 2026
53AQI (US)
20th May 2026
51AQI (US)
21st May 2026
44AQI (US)
22nd May 2026
42AQI (US)
23rd May 2026
46AQI (US)
24th May 2026
44AQI (US)
25th May 2026
43AQI (US)
26th May 2026
32AQI (US)
27th May 2026
26AQI (US)
28th May 2026
16AQI (US)
29th May 2026
20AQI (US)
30th May 2026
26AQI (US)
31st May 2026
25AQI (US)
1st June 2026
29AQI (US)
2nd June 2026
22AQI (US)
3rd June 2026
22AQI (US)
4th June 2026
25AQI (US)
5th June 2026
30AQI (US)
6th June 2026
21AQI (US)
7th June 2026
24AQI (US)
8th June 2026
24AQI (US)
9th June 2026
22AQI (US)
10th June 2026
22AQI (US)
11th June 2026
23AQI (US)
12th June 2026
23AQI (US)
13th June 2026
21AQI (US)
14th June 2026
20AQI (US)
15th June 2026
22AQI (US)
16th June 2026
24AQI (US)
17th June 2026
23AQI (US)
18th June 2026
25AQI (US)
19th June 2026
22AQI (US)
20th June 2026
20AQI (US)
21st June 2026
25AQI (US)
22nd June 2026
21AQI (US)
23rd June 2026
18AQI (US)
24th June 2026
21AQI (US)
25th June 2026
19AQI (US)
26th June 2026
23AQI (US)
27th June 2026
29AQI (US)
28th June 2026
27AQI (US)
29th June 2026
26AQI (US)
30th June 2026
40AQI (US)
1st July 2026
43AQI (US)
2nd July 2026
26AQI (US)
3rd July 2026
22AQI (US)
4th July 2026
30AQI (US)
5th July 2026
43AQI (US)
6th July 2026
39AQI (US)
7th July 2026
36AQI (US)
8th July 2026
37AQI (US)
9th July 2026
29AQI (US)
10th July 2026
25AQI (US)
11th July 2026
38AQI (US)
12th July 2026
40AQI (US)
13th July 2026
43AQI (US)
14th July 2026
36AQI (US)
15th July 2026
47AQI (US)
16th July 2026
102AQI (US)
17th July 2026
174AQI (US)
18th July 2026
64AQI (US)
19th July 2026
129AQI (US)
20th July 2026
121AQI (US)
21st July 2026
64AQI (US)
22nd July 2026
33AQI (US)
23rd July 2026
38AQI (US)
24th July 2026
42AQI (US)
25th July 2026
43AQI (US)
26th July 2026
50AQI (US)
27th July 2026
52AQI (US)
28th July 2026
44AQI (US)
29th July 2026
35AQI (US)
30th July 2026
39AQI (US)
31st July 2026
43AQI (US)
1st August 2026
2nd August 2026
3rd August 2026
4th August 2026
5th August 2026
6th August 2026
7th August 2026
8th August 2026
9th August 2026
10th August 2026
11th August 2026
12th August 2026
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

35AQI (US)

41AQI (US)

36AQI (US)

28AQI (US)

34AQI (US)

24AQI (US)

52AQI (US)

No. of days

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

202636AQI (US)

26
5
28
30
1
28
26
4
30
24
3
3
1
192
13
3
1

Highest AQI (US) recorded in

July

52AQI (US)

Lowest AQI (US) recorded in

June

24AQI (US)

202542AQI (US)

1
1
28
3
28
2
31
16
14
14
16
1
19
12
17
13
24
7
20
10
19
12
217
90
1

Highest AQI (US) recorded in

June

54AQI (US)

Lowest AQI (US) recorded in

May

28AQI (US)

Most & Least Polluted Years Over the Last 2 Years

Most Polluted Year Recorded
2025(Avg.)
42AQI (US)
Least Polluted Year Recorded
2026(Avg.)
36AQI (US)

Chicago's annual 2026 AQI (US) (36) shows an average percentage change of -14.2% (improved AQI (US)) compared to previous years: 2025 (42).