Winthrop Harbor, 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
Winthrop Harbor, Illinois, United States
2022
2023
2024
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Aug 2025
104AQILowest AQI recorded on
20th Aug 2025
17AQISame Day Analysis (6th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 55 of Moderate air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 5th Aug - 6th Aug 2026
Winthrop Harbor, Illinois, United States
AQI
Day
Night
.
5 AM5th Aug 2026
8 PM
4 AM6th Aug 2026
Day time
Avg. Highest Time
5PM5th Aug
59AQI
Avg. Lowest Time
6AM5th Aug
42AQI
Night time
Avg. Highest Time
1AM6th Aug
59AQI
Avg. Lowest Time
2AM6th Aug
49AQI
In the last 24 hours,
Winthrop Harbor's AQI reached its highest point of 59 at 5 PM during the Day, while the lowest point, 42, was recorded at 6 AM during the Day between 5th Aug and 6th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Winthrop Harbor, Illinois, United States
JulAug
08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th
Day
Night
8th Jul 2026205 AMAQI
8th Jul 2026186 AMAQI
8th Jul 2026187 AMAQI
8th Jul 2026228 AMAQI
8th Jul 2026219 AMAQI
8th Jul 20262310 AMAQI
8th Jul 20262011 AMAQI
8th Jul 20262012 PMAQI
8th Jul 2026221 PMAQI
8th Jul 2026192 PMAQI
8th Jul 2026213 PMAQI
8th Jul 2026324 PMAQI
8th Jul 2026325 PMAQI
8th Jul 2026186 PMAQI
8th Jul 2026197 PMAQI
8th Jul 2026198 PMAQI
8th Jul 2026209 PMAQI
8th Jul 20261810 PMAQI
8th Jul 20261811 PMAQI
9th Jul 20261612 AMAQI
9th Jul 2026361 AMAQI
9th Jul 2026382 AMAQI
9th Jul 2026383 AMAQI
9th Jul 2026204 AMAQI
26°C19/33°C
9th Jul 2026215 AMAQI
9th Jul 2026206 AMAQI
9th Jul 2026367 AMAQI
9th Jul 2026218 AMAQI
9th Jul 2026349 AMAQI
9th Jul 20262010 AMAQI
9th Jul 20261911 AMAQI
9th Jul 20261612 PMAQI
9th Jul 2026301 PMAQI
9th Jul 2026162 PMAQI
9th Jul 2026203 PMAQI
9th Jul 2026144 PMAQI
9th Jul 2026155 PMAQI
9th Jul 2026146 PMAQI
9th Jul 2026127 PMAQI
9th Jul 2026118 PMAQI
9th Jul 2026129 PMAQI
9th Jul 20261010 PMAQI
9th Jul 20261111 PMAQI
10th Jul 20261012 AMAQI
10th Jul 2026101 AMAQI
10th Jul 2026102 AMAQI
10th Jul 202693 AMAQI
10th Jul 2026324 AMAQI
26°C20/33°C
10th Jul 2026285 AMAQI
10th Jul 2026296 AMAQI
10th Jul 2026107 AMAQI
10th Jul 2026278 AMAQI
10th Jul 2026129 AMAQI
10th Jul 20261010 AMAQI
10th Jul 2026911 AMAQI
10th Jul 20261012 PMAQI
10th Jul 202691 PMAQI
10th Jul 202692 PMAQI
10th Jul 202693 PMAQI
10th Jul 2026104 PMAQI
10th Jul 2026285 PMAQI
10th Jul 2026226 PMAQI
10th Jul 2026227 PMAQI
10th Jul 2026118 PMAQI
10th Jul 2026109 PMAQI
10th Jul 20261210 PMAQI
10th Jul 20261211 PMAQI
11th Jul 20261212 AMAQI
11th Jul 2026141 AMAQI
11th Jul 2026302 AMAQI
11th Jul 2026573 AMAQI
11th Jul 2026394 AMAQI
23°C19/28°C
11th Jul 2026405 AMAQI
11th Jul 2026146 AMAQI
11th Jul 2026147 AMAQI
11th Jul 2026138 AMAQI
11th Jul 2026149 AMAQI
11th Jul 20261510 AMAQI
11th Jul 20263011 AMAQI
11th Jul 20264212 PMAQI
11th Jul 2026301 PMAQI
11th Jul 2026102 PMAQI
11th Jul 2026103 PMAQI
11th Jul 2026104 PMAQI
11th Jul 2026105 PMAQI
11th Jul 202696 PMAQI
11th Jul 2026107 PMAQI
11th Jul 2026308 PMAQI
11th Jul 2026309 PMAQI
11th Jul 20262810 PMAQI
11th Jul 20261611 PMAQI
12th Jul 20261512 AMAQI
12th Jul 2026141 AMAQI
12th Jul 2026122 AMAQI
12th Jul 2026363 AMAQI
12th Jul 2026144 AMAQI
23°C18/29°C
12th Jul 2026145 AMAQI
12th Jul 2026156 AMAQI
12th Jul 2026367 AMAQI
12th Jul 2026168 AMAQI
12th Jul 2026389 AMAQI
12th Jul 20264010 AMAQI
12th Jul 20263611 AMAQI
12th Jul 20263612 PMAQI
12th Jul 2026161 PMAQI
12th Jul 2026142 PMAQI
12th Jul 2026143 PMAQI
12th Jul 2026404 PMAQI
12th Jul 2026405 PMAQI
12th Jul 2026176 PMAQI
12th Jul 2026157 PMAQI
12th Jul 2026168 PMAQI
12th Jul 2026159 PMAQI
12th Jul 20261410 PMAQI
12th Jul 20261611 PMAQI
13th Jul 20261512 AMAQI
13th Jul 2026161 AMAQI
13th Jul 2026162 AMAQI
13th Jul 2026153 AMAQI
13th Jul 2026154 AMAQI
24°C18/29°C
13th Jul 2026165 AMAQI
13th Jul 2026176 AMAQI
13th Jul 2026167 AMAQI
13th Jul 2026168 AMAQI
13th Jul 2026189 AMAQI
13th Jul 20264010 AMAQI
13th Jul 20264411 AMAQI
13th Jul 20264012 PMAQI
13th Jul 2026211 PMAQI
13th Jul 2026232 PMAQI
13th Jul 2026243 PMAQI
13th Jul 2026204 PMAQI
13th Jul 2026205 PMAQI
13th Jul 2026206 PMAQI
13th Jul 2026387 PMAQI
13th Jul 2026378 PMAQI
13th Jul 2026359 PMAQI
13th Jul 20263510 PMAQI
13th Jul 20261911 PMAQI
14th Jul 20261812 AMAQI
14th Jul 2026441 AMAQI
14th Jul 2026482 AMAQI
14th Jul 2026443 AMAQI
14th Jul 2026424 AMAQI
27°C19/35°C
14th Jul 2026215 AMAQI
14th Jul 2026206 AMAQI
14th Jul 2026197 AMAQI
14th Jul 2026208 AMAQI
14th Jul 2026229 AMAQI
14th Jul 20262210 AMAQI
14th Jul 20262511 AMAQI
14th Jul 20262312 PMAQI
14th Jul 2026221 PMAQI
14th Jul 2026322 PMAQI
14th Jul 2026223 PMAQI
14th Jul 2026264 PMAQI
14th Jul 2026225 PMAQI
14th Jul 2026326 PMAQI
14th Jul 2026337 PMAQI
14th Jul 2026208 PMAQI
14th Jul 2026189 PMAQI
14th Jul 20261810 PMAQI
14th Jul 20261711 PMAQI
15th Jul 20262012 AMAQI
15th Jul 2026341 AMAQI
15th Jul 2026912 AMAQI
15th Jul 2026393 AMAQI
15th Jul 2026194 AMAQI
29°C22/37°C
15th Jul 2026205 AMAQI
15th Jul 2026186 AMAQI
15th Jul 2026787 AMAQI
15th Jul 2026208 AMAQI
15th Jul 2026499 AMAQI
15th Jul 20264010 AMAQI
15th Jul 20264211 AMAQI
15th Jul 20263912 PMAQI
15th Jul 2026381 PMAQI
15th Jul 2026512 PMAQI
15th Jul 2026443 PMAQI
15th Jul 2026404 PMAQI
15th Jul 2026265 PMAQI
15th Jul 2026396 PMAQI
15th Jul 2026407 PMAQI
15th Jul 2026408 PMAQI
15th Jul 2026729 PMAQI
15th Jul 20267210 PMAQI
15th Jul 20266011 PMAQI
16th Jul 20269012 AMAQI
16th Jul 2026761 AMAQI
16th Jul 2026732 AMAQI
16th Jul 2026783 AMAQI
16th Jul 2026904 AMAQI
29°C23/36°C
16th Jul 2026905 AMAQI
16th Jul 20262116 AMAQI
16th Jul 20261777 AMAQI
16th Jul 20262128 AMAQI
16th Jul 2026319 AMAQI
16th Jul 20262910 AMAQI
16th Jul 20263011 AMAQI
16th Jul 202620212 PMAQI
16th Jul 2026301 PMAQI
16th Jul 20261322 PMAQI
16th Jul 20261903 PMAQI
16th Jul 20261224 PMAQI
16th Jul 20262005 PMAQI
16th Jul 2026956 PMAQI
16th Jul 20261527 PMAQI
16th Jul 20261228 PMAQI
16th Jul 20261169 PMAQI
16th Jul 202612810 PMAQI
16th Jul 20269211 PMAQI
17th Jul 20267012 AMAQI
17th Jul 2026941 AMAQI
17th Jul 20261752 AMAQI
17th Jul 20262123 AMAQI
17th Jul 20262564 AMAQI
26°C22/31°C
17th Jul 20262505 AMAQI
17th Jul 20262986 AMAQI
17th Jul 20262907 AMAQI
17th Jul 20262798 AMAQI
17th Jul 20262749 AMAQI
17th Jul 202626410 AMAQI
17th Jul 202625911 AMAQI
17th Jul 202624212 PMAQI
17th Jul 20262521 PMAQI
17th Jul 20261772 PMAQI
17th Jul 20261583 PMAQI
17th Jul 20261424 PMAQI
17th Jul 20261225 PMAQI
17th Jul 2026926 PMAQI
17th Jul 2026747 PMAQI
17th Jul 2026658 PMAQI
17th Jul 2026629 PMAQI
17th Jul 20265710 PMAQI
17th Jul 20266211 PMAQI
18th Jul 20265812 AMAQI
18th Jul 2026551 AMAQI
18th Jul 2026502 AMAQI
18th Jul 2026463 AMAQI
18th Jul 2026424 AMAQI
29°C22/37°C
18th Jul 2026485 AMAQI
18th Jul 2026426 AMAQI
18th Jul 2026577 AMAQI
18th Jul 2026428 AMAQI
18th Jul 2026639 AMAQI
18th Jul 20264610 AMAQI
18th Jul 20265811 AMAQI
18th Jul 20264412 PMAQI
18th Jul 2026571 PMAQI
18th Jul 2026682 PMAQI
18th Jul 2026483 PMAQI
18th Jul 2026544 PMAQI
18th Jul 2026675 PMAQI
18th Jul 2026966 PMAQI
18th Jul 20261297 PMAQI
18th Jul 20261508 PMAQI
18th Jul 20261569 PMAQI
18th Jul 202615610 PMAQI
18th Jul 202615611 PMAQI
19th Jul 202617212 AMAQI
19th Jul 20261791 AMAQI
19th Jul 20261642 AMAQI
19th Jul 20261603 AMAQI
19th Jul 20261484 AMAQI
27°C22/35°C
19th Jul 20261475 AMAQI
19th Jul 20261386 AMAQI
19th Jul 20261287 AMAQI
19th Jul 2026978 AMAQI
19th Jul 20261259 AMAQI
19th Jul 202613110 AMAQI
19th Jul 202611511 AMAQI
19th Jul 202612212 PMAQI
19th Jul 20261181 PMAQI
19th Jul 20261162 PMAQI
19th Jul 20261193 PMAQI
19th Jul 20261224 PMAQI
19th Jul 20261255 PMAQI
19th Jul 20261166 PMAQI
19th Jul 20261297 PMAQI
19th Jul 2026928 PMAQI
19th Jul 20261179 PMAQI
19th Jul 202611410 PMAQI
19th Jul 202611611 PMAQI
20th Jul 202613612 AMAQI
20th Jul 20261411 AMAQI
20th Jul 20261342 AMAQI
20th Jul 20261453 AMAQI
20th Jul 20261464 AMAQI
22°C19/28°C
20th Jul 20261425 AMAQI
20th Jul 20261516 AMAQI
20th Jul 20261387 AMAQI
20th Jul 20261168 AMAQI
20th Jul 20261349 AMAQI
20th Jul 202610210 AMAQI
20th Jul 202613611 AMAQI
20th Jul 20269512 PMAQI
20th Jul 20261201 PMAQI
20th Jul 20261222 PMAQI
20th Jul 20261153 PMAQI
20th Jul 20261184 PMAQI
20th Jul 2026945 PMAQI
20th Jul 20261126 PMAQI
20th Jul 20261127 PMAQI
20th Jul 20261058 PMAQI
20th Jul 20261059 PMAQI
20th Jul 202610611 PMAQI
21st Jul 20267312 AMAQI
21st Jul 2026761 AMAQI
21st Jul 2026562 AMAQI
21st Jul 2026603 AMAQI
21st Jul 2026534 AMAQI
23°C16/31°C
21st Jul 2026525 AMAQI
21st Jul 2026466 AMAQI
21st Jul 2026297 AMAQI
21st Jul 2026348 AMAQI
21st Jul 2026369 AMAQI
21st Jul 20264210 AMAQI
21st Jul 20264411 AMAQI
21st Jul 20265112 PMAQI
21st Jul 2026491 PMAQI
21st Jul 2026532 PMAQI
21st Jul 2026583 PMAQI
21st Jul 2026514 PMAQI
21st Jul 2026475 PMAQI
21st Jul 2026516 PMAQI
21st Jul 2026507 PMAQI
21st Jul 2026128 PMAQI
21st Jul 2026299 PMAQI
21st Jul 2026810 PMAQI
21st Jul 20263611 PMAQI
22nd Jul 20263812 AMAQI
22nd Jul 2026251 AMAQI
22nd Jul 2026232 AMAQI
22nd Jul 2026273 AMAQI
22nd Jul 202684 AMAQI
25°C19/31°C
22nd Jul 2026335 AMAQI
22nd Jul 202686 AMAQI
22nd Jul 2026337 AMAQI
22nd Jul 2026268 AMAQI
22nd Jul 2026149 AMAQI
22nd Jul 20261810 AMAQI
22nd Jul 20261011 AMAQI
22nd Jul 20261112 PMAQI
22nd Jul 202681 PMAQI
22nd Jul 2026102 PMAQI
22nd Jul 2026123 PMAQI
22nd Jul 2026124 PMAQI
22nd Jul 2026255 PMAQI
22nd Jul 2026256 PMAQI
22nd Jul 2026277 PMAQI
22nd Jul 2026128 PMAQI
22nd Jul 2026109 PMAQI
22nd Jul 20264010 PMAQI
22nd Jul 20263311 PMAQI
23rd Jul 20264212 AMAQI
23rd Jul 2026561 AMAQI
23rd Jul 2026262 AMAQI
23rd Jul 2026463 AMAQI
23rd Jul 2026424 AMAQI
20°C14/25°C
23rd Jul 2026465 AMAQI
23rd Jul 2026446 AMAQI
23rd Jul 2026307 AMAQI
23rd Jul 2026408 AMAQI
23rd Jul 2026429 AMAQI
23rd Jul 20263810 AMAQI
23rd Jul 20264611 AMAQI
23rd Jul 20264612 PMAQI
23rd Jul 2026441 PMAQI
23rd Jul 2026332 PMAQI
23rd Jul 2026403 PMAQI
23rd Jul 2026404 PMAQI
23rd Jul 2026425 PMAQI
23rd Jul 2026426 PMAQI
23rd Jul 2026407 PMAQI
23rd Jul 2026408 PMAQI
23rd Jul 2026259 PMAQI
23rd Jul 20262910 PMAQI
23rd Jul 20263611 PMAQI
24th Jul 20262512 AMAQI
24th Jul 2026521 AMAQI
24th Jul 2026462 AMAQI
24th Jul 2026463 AMAQI
24th Jul 2026464 AMAQI
20°C13/27°C
24th Jul 2026425 AMAQI
24th Jul 2026426 AMAQI
24th Jul 2026337 AMAQI
24th Jul 2026448 AMAQI
24th Jul 2026479 AMAQI
24th Jul 20262910 AMAQI
24th Jul 20262711 AMAQI
24th Jul 20263012 PMAQI
24th Jul 2026321 PMAQI
24th Jul 2026212 PMAQI
24th Jul 2026213 PMAQI
24th Jul 2026214 PMAQI
24th Jul 2026325 PMAQI
24th Jul 2026306 PMAQI
24th Jul 2026317 PMAQI
24th Jul 2026258 PMAQI
24th Jul 2026219 PMAQI
24th Jul 20262510 PMAQI
24th Jul 20262111 PMAQI
25th Jul 20263312 AMAQI
25th Jul 2026211 AMAQI
25th Jul 2026232 AMAQI
25th Jul 2026253 AMAQI
25th Jul 2026424 AMAQI
21°C15/27°C
25th Jul 2026255 AMAQI
25th Jul 2026256 AMAQI
25th Jul 2026367 AMAQI
25th Jul 2026408 AMAQI
25th Jul 2026409 AMAQI
25th Jul 20264010 AMAQI
25th Jul 20262511 AMAQI
25th Jul 20262112 PMAQI
25th Jul 2026251 PMAQI
25th Jul 2026232 PMAQI
25th Jul 2026253 PMAQI
25th Jul 2026334 PMAQI
25th Jul 2026365 PMAQI
25th Jul 2026406 PMAQI
25th Jul 2026367 PMAQI
25th Jul 2026338 PMAQI
25th Jul 2026389 PMAQI
25th Jul 20263610 PMAQI
25th Jul 20264511 PMAQI
26th Jul 20263812 AMAQI
26th Jul 2026401 AMAQI
26th Jul 2026422 AMAQI
26th Jul 2026403 AMAQI
26th Jul 2026384 AMAQI
22°C16/30°C
26th Jul 2026445 AMAQI
26th Jul 2026516 AMAQI
26th Jul 2026427 AMAQI
26th Jul 2026388 AMAQI
26th Jul 2026479 AMAQI
26th Jul 20264210 AMAQI
26th Jul 20264411 AMAQI
26th Jul 20265112 PMAQI
26th Jul 2026531 PMAQI
26th Jul 2026562 PMAQI
26th Jul 2026573 PMAQI
26th Jul 2026534 PMAQI
26th Jul 2026535 PMAQI
26th Jul 2026556 PMAQI
26th Jul 2026537 PMAQI
26th Jul 2026518 PMAQI
26th Jul 2026499 PMAQI
26th Jul 20265210 PMAQI
26th Jul 20265411 PMAQI
27th Jul 20265312 AMAQI
27th Jul 2026551 AMAQI
27th Jul 2026552 AMAQI
27th Jul 2026533 AMAQI
27th Jul 2026514 AMAQI
27°C22/35°C
27th Jul 2026525 AMAQI
27th Jul 2026526 AMAQI
27th Jul 2026537 AMAQI
27th Jul 2026548 AMAQI
27th Jul 2026519 AMAQI
27th Jul 20265410 AMAQI
27th Jul 20265611 AMAQI
27th Jul 20265812 PMAQI
27th Jul 2026581 PMAQI
27th Jul 2026462 PMAQI
27th Jul 2026423 PMAQI
27th Jul 2026444 PMAQI
27th Jul 2026405 PMAQI
27th Jul 2026326 PMAQI
27th Jul 2026327 PMAQI
27th Jul 2026468 PMAQI
27th Jul 2026409 PMAQI
27th Jul 20262910 PMAQI
27th Jul 20264411 PMAQI
28th Jul 20264412 AMAQI
28th Jul 2026481 AMAQI
28th Jul 2026462 AMAQI
28th Jul 2026463 AMAQI
28th Jul 2026424 AMAQI
25°C22/33°C
28th Jul 2026505 AMAQI
28th Jul 2026506 AMAQI
28th Jul 2026467 AMAQI
28th Jul 2026508 AMAQI
28th Jul 2026489 AMAQI
28th Jul 20265110 AMAQI
28th Jul 20265011 AMAQI
28th Jul 20265012 PMAQI
28th Jul 2026521 PMAQI
28th Jul 2026522 PMAQI
28th Jul 2026513 PMAQI
28th Jul 2026444 PMAQI
28th Jul 2026365 PMAQI
28th Jul 2026366 PMAQI
28th Jul 2026367 PMAQI
28th Jul 2026408 PMAQI
28th Jul 2026299 PMAQI
28th Jul 20262510 PMAQI
28th Jul 20262711 PMAQI
29th Jul 20263212 AMAQI
29th Jul 2026211 AMAQI
29th Jul 2026232 AMAQI
29th Jul 2026273 AMAQI
29th Jul 2026214 AMAQI
22°C18/27°C
29th Jul 2026365 AMAQI
29th Jul 2026386 AMAQI
29th Jul 2026407 AMAQI
29th Jul 2026368 AMAQI
29th Jul 2026299 AMAQI
29th Jul 20263010 AMAQI
29th Jul 20263611 AMAQI
29th Jul 20262512 PMAQI
29th Jul 2026311 PMAQI
29th Jul 2026332 PMAQI
29th Jul 2026313 PMAQI
29th Jul 2026344 PMAQI
29th Jul 2026265 PMAQI
29th Jul 2026386 PMAQI
29th Jul 2026237 PMAQI
29th Jul 2026328 PMAQI
29th Jul 2026469 PMAQI
29th Jul 20263310 PMAQI
29th Jul 20264011 PMAQI
30th Jul 20265812 AMAQI
30th Jul 2026251 AMAQI
30th Jul 2026302 AMAQI
30th Jul 2026523 AMAQI
30th Jul 2026544 AMAQI
22°C15/28°C
30th Jul 2026445 AMAQI
30th Jul 2026276 AMAQI
30th Jul 2026447 AMAQI
30th Jul 2026388 AMAQI
30th Jul 2026299 AMAQI
30th Jul 20262910 AMAQI
30th Jul 20264611 AMAQI
30th Jul 20263612 PMAQI
30th Jul 2026341 PMAQI
30th Jul 2026342 PMAQI
30th Jul 2026293 PMAQI
30th Jul 2026334 PMAQI
30th Jul 2026335 PMAQI
30th Jul 2026336 PMAQI
30th Jul 2026337 PMAQI
30th Jul 2026368 PMAQI
30th Jul 2026389 PMAQI
30th Jul 20264210 PMAQI
30th Jul 20264611 PMAQI
31st Jul 20262112 AMAQI
31st Jul 2026211 AMAQI
31st Jul 2026272 AMAQI
31st Jul 2026273 AMAQI
31st Jul 2026214 AMAQI
24°C15/31°C
31st Jul 2026385 AMAQI
31st Jul 2026386 AMAQI
31st Jul 2026387 AMAQI
31st Jul 2026368 AMAQI
31st Jul 2026409 AMAQI
31st Jul 20263810 AMAQI
31st Jul 20262511 AMAQI
31st Jul 20263312 PMAQI
31st Jul 2026331 PMAQI
31st Jul 2026382 PMAQI
31st Jul 2026363 PMAQI
31st Jul 2026384 PMAQI
31st Jul 2026365 PMAQI
31st Jul 2026366 PMAQI
31st Jul 2026337 PMAQI
31st Jul 2026278 PMAQI
31st Jul 2026259 PMAQI
31st Jul 20263610 PMAQI
31st Jul 20262511 PMAQI
1st Aug 20262712 AMAQI
1st Aug 2026361 AMAQI
1st Aug 2026252 AMAQI
1st Aug 2026253 AMAQI
1st Aug 2026254 AMAQI
23°C18/30°C
1st Aug 2026325 AMAQI
1st Aug 2026326 AMAQI
1st Aug 2026347 AMAQI
1st Aug 2026408 AMAQI
1st Aug 2026409 AMAQI
1st Aug 20264210 AMAQI
1st Aug 20264011 AMAQI
1st Aug 20264012 PMAQI
1st Aug 2026421 PMAQI
1st Aug 2026442 PMAQI
1st Aug 2026423 PMAQI
1st Aug 2026404 PMAQI
1st Aug 2026425 PMAQI
1st Aug 2026336 PMAQI
1st Aug 2026337 PMAQI
1st Aug 2026408 PMAQI
1st Aug 2026429 PMAQI
1st Aug 20264210 PMAQI
1st Aug 20264211 PMAQI
2nd Aug 20264212 AMAQI
2nd Aug 2026421 AMAQI
2nd Aug 2026402 AMAQI
2nd Aug 2026423 AMAQI
2nd Aug 2026404 AMAQI
21°C20/23°C
2nd Aug 2026445 AMAQI
2nd Aug 2026406 AMAQI
2nd Aug 2026427 AMAQI
2nd Aug 2026428 AMAQI
2nd Aug 2026429 AMAQI
2nd Aug 20264610 AMAQI
2nd Aug 20264211 AMAQI
2nd Aug 20264012 PMAQI
2nd Aug 2026441 PMAQI
2nd Aug 2026442 PMAQI
2nd Aug 2026443 PMAQI
2nd Aug 2026424 PMAQI
2nd Aug 2026425 PMAQI
2nd Aug 2026406 PMAQI
2nd Aug 2026467 PMAQI
2nd Aug 2026448 PMAQI
2nd Aug 2026369 PMAQI
2nd Aug 20263410 PMAQI
2nd Aug 20263211 PMAQI
3rd Aug 20262512 AMAQI
3rd Aug 2026291 AMAQI
3rd Aug 2026212 AMAQI
3rd Aug 2026213 AMAQI
3rd Aug 2026364 AMAQI
21°C19/26°C
3rd Aug 2026365 AMAQI
3rd Aug 2026346 AMAQI
3rd Aug 2026367 AMAQI
3rd Aug 2026388 AMAQI
3rd Aug 2026389 AMAQI
3rd Aug 20264010 AMAQI
3rd Aug 20263811 AMAQI
3rd Aug 20264412 PMAQI
3rd Aug 2026341 PMAQI
3rd Aug 2026442 PMAQI
3rd Aug 2026423 PMAQI
3rd Aug 2026424 PMAQI
3rd Aug 2026405 PMAQI
3rd Aug 2026426 PMAQI
3rd Aug 2026467 PMAQI
3rd Aug 2026408 PMAQI
3rd Aug 2026409 PMAQI
3rd Aug 20264010 PMAQI
3rd Aug 20264011 PMAQI
4th Aug 20263612 AMAQI
4th Aug 2026211 AMAQI
4th Aug 2026382 AMAQI
4th Aug 2026423 AMAQI
4th Aug 2026384 AMAQI
21°C17/27°C
4th Aug 2026405 AMAQI
4th Aug 2026406 AMAQI
4th Aug 2026407 AMAQI
4th Aug 2026388 AMAQI
4th Aug 2026409 AMAQI
4th Aug 20263610 AMAQI
4th Aug 20265011 AMAQI
4th Aug 20263612 PMAQI
4th Aug 2026441 PMAQI
4th Aug 2026442 PMAQI
4th Aug 2026443 PMAQI
4th Aug 2026484 PMAQI
4th Aug 2026365 PMAQI
4th Aug 2026486 PMAQI
4th Aug 2026427 PMAQI
4th Aug 2026448 PMAQI
4th Aug 2026409 PMAQI
4th Aug 20264410 PMAQI
4th Aug 20264811 PMAQI
5th Aug 20264012 AMAQI
5th Aug 2026481 AMAQI
5th Aug 2026522 AMAQI
5th Aug 2026523 AMAQI
5th Aug 2026524 AMAQI
24°C18/30°C
5th Aug 2026515 AMAQI
5th Aug 2026426 AMAQI
5th Aug 2026527 AMAQI
5th Aug 2026528 AMAQI
5th Aug 2026509 AMAQI
5th Aug 20264610 AMAQI
5th Aug 20264611 AMAQI
5th Aug 20264612 PMAQI
5th Aug 2026441 PMAQI
5th Aug 2026522 PMAQI
5th Aug 2026553 PMAQI
5th Aug 2026554 PMAQI
5th Aug 2026595 PMAQI
5th Aug 2026596 PMAQI
5th Aug 2026597 PMAQI
5th Aug 2026568 PMAQI
5th Aug 2026519 PMAQI
5th Aug 20265210 PMAQI
5th Aug 20265511 PMAQI
6th Aug 20265612 AMAQI
6th Aug 2026591 AMAQI
6th Aug 2026492 AMAQI
6th Aug 2026553 AMAQI
6th Aug 2026524 AMAQI
24°C21/28°C
6th Aug 2026545 AMAQI
5 AM6th Aug 2026566 AMAQI
6th Aug 2026567 AMAQI
6th Aug 2026548 AMAQI
6th Aug 2026589 AMAQI
6th Aug 20265610 AMAQI
6th Aug 20265811 AMAQI
6th Aug 20265712 PMAQI
12 PM6th Aug 2026571 PMAQI
6th Aug 2026562 PMAQI
6th Aug 2026553 PMAQI
6th Aug 2026534 PMAQI
6th Aug 2026565 PMAQI
6th Aug 2026556 PMAQI
6th Aug 2026537 PMAQI
6th Aug 2026558 PMAQI
8 PM6th Aug 2026539 PMAQI
6th Aug 20265310 PMAQI
6th Aug 20265211 PMAQI
12 AM
4 AM
22°C18/26°C
Day time
Avg. Highest Time
7 AM
57AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
8 PM
45AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 AM to 7 AM (Avg. 57), while the lowest AQI was between 8 PM to 8 PM (Avg. 45).
Night time
Avg. Highest Time
3 AM
53AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
12 AM
44AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 3 AM to 3 AM (Avg. 53), while the lowest AQI was between 12 AM to 12 AM (Avg. 44).
2026 Days Vs Air Quality
Winthrop Harbor, Illinois, United States
2026
94%
203
4%
8
1%
3
0.4%
1
Total number of days with different AQI categories in last 218 days in 2026 (147 days remaining)
Good
203 DaysModerate
8 DaysPoor
3 DaysUnhealthy
1 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2026, 94% of 218 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
Winthrop Harbor, 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
18AQI (US)
18AQI (US)
2nd January 2026
29AQI (US)
29AQI (US)
3rd January 2026
23AQI (US)
23AQI (US)
4th January 2026
29AQI (US)
29AQI (US)
5th January 2026
43AQI (US)
43AQI (US)
6th January 2026
67AQI (US)
67AQI (US)
7th January 2026
45AQI (US)
45AQI (US)
8th January 2026
43AQI (US)
43AQI (US)
9th January 2026
17AQI (US)
17AQI (US)
10th January 2026
22AQI (US)
22AQI (US)
11th January 2026
20AQI (US)
20AQI (US)
12th January 2026
20AQI (US)
20AQI (US)
13th January 2026
19AQI (US)
19AQI (US)
14th January 2026
12AQI (US)
12AQI (US)
15th January 2026
15AQI (US)
15AQI (US)
16th January 2026
21AQI (US)
21AQI (US)
17th January 2026
15AQI (US)
15AQI (US)
18th January 2026
24AQI (US)
24AQI (US)
19th January 2026
16AQI (US)
16AQI (US)
20th January 2026
26AQI (US)
26AQI (US)
21st January 2026
38AQI (US)
38AQI (US)
22nd January 2026
51AQI (US)
51AQI (US)
23rd January 2026
54AQI (US)
54AQI (US)
24th January 2026
39AQI (US)
39AQI (US)
25th January 2026
43AQI (US)
43AQI (US)
26th January 2026
50AQI (US)
50AQI (US)
27th January 2026
40AQI (US)
40AQI (US)
28th January 2026
37AQI (US)
37AQI (US)
29th January 2026
43AQI (US)
43AQI (US)
30th January 2026
57AQI (US)
57AQI (US)
31st January 2026
45AQI (US)
45AQI (US)
1st February 2026
44AQI (US)
44AQI (US)
2nd February 2026
45AQI (US)
45AQI (US)
3rd February 2026
46AQI (US)
46AQI (US)
4th February 2026
37AQI (US)
37AQI (US)
5th February 2026
49AQI (US)
49AQI (US)
6th February 2026
41AQI (US)
41AQI (US)
7th February 2026
32AQI (US)
32AQI (US)
8th February 2026
42AQI (US)
42AQI (US)
9th February 2026
45AQI (US)
45AQI (US)
10th February 2026
40AQI (US)
40AQI (US)
11th February 2026
30AQI (US)
30AQI (US)
12th February 2026
26AQI (US)
26AQI (US)
13th February 2026
37AQI (US)
37AQI (US)
14th February 2026
43AQI (US)
43AQI (US)
15th February 2026
48AQI (US)
48AQI (US)
16th February 2026
40AQI (US)
40AQI (US)
17th February 2026
41AQI (US)
41AQI (US)
18th February 2026
40AQI (US)
40AQI (US)
19th February 2026
33AQI (US)
33AQI (US)
20th February 2026
34AQI (US)
34AQI (US)
21st February 2026
34AQI (US)
34AQI (US)
22nd February 2026
34AQI (US)
34AQI (US)
23rd February 2026
32AQI (US)
32AQI (US)
24th February 2026
36AQI (US)
36AQI (US)
25th February 2026
34AQI (US)
34AQI (US)
26th February 2026
29AQI (US)
29AQI (US)
27th February 2026
30AQI (US)
30AQI (US)
28th February 2026
25AQI (US)
25AQI (US)
1st March 2026
33AQI (US)
33AQI (US)
2nd March 2026
43AQI (US)
43AQI (US)
3rd March 2026
32AQI (US)
32AQI (US)
4th March 2026
39AQI (US)
39AQI (US)
5th March 2026
38AQI (US)
38AQI (US)
6th March 2026
30AQI (US)
30AQI (US)
7th March 2026
33AQI (US)
33AQI (US)
8th March 2026
35AQI (US)
35AQI (US)
9th March 2026
31AQI (US)
31AQI (US)
10th March 2026
30AQI (US)
30AQI (US)
11th March 2026
42AQI (US)
42AQI (US)
12th March 2026
30AQI (US)
30AQI (US)
13th March 2026
35AQI (US)
35AQI (US)
14th March 2026
36AQI (US)
36AQI (US)
15th March 2026
28AQI (US)
28AQI (US)
16th March 2026
34AQI (US)
34AQI (US)
17th March 2026
31AQI (US)
31AQI (US)
18th March 2026
24AQI (US)
24AQI (US)
19th March 2026
37AQI (US)
37AQI (US)
20th March 2026
39AQI (US)
39AQI (US)
21st March 2026
34AQI (US)
34AQI (US)
22nd March 2026
34AQI (US)
34AQI (US)
23rd March 2026
38AQI (US)
38AQI (US)
24th March 2026
28AQI (US)
28AQI (US)
25th March 2026
29AQI (US)
29AQI (US)
26th March 2026
33AQI (US)
33AQI (US)
27th March 2026
26AQI (US)
26AQI (US)
28th March 2026
27AQI (US)
27AQI (US)
29th March 2026
21AQI (US)
21AQI (US)
30th March 2026
25AQI (US)
25AQI (US)
31st March 2026
25AQI (US)
25AQI (US)
1st April 2026
30AQI (US)
30AQI (US)
2nd April 2026
24AQI (US)
24AQI (US)
3rd April 2026
27AQI (US)
27AQI (US)
4th April 2026
31AQI (US)
31AQI (US)
5th April 2026
30AQI (US)
30AQI (US)
6th April 2026
31AQI (US)
31AQI (US)
7th April 2026
27AQI (US)
27AQI (US)
8th April 2026
29AQI (US)
29AQI (US)
9th April 2026
21AQI (US)
21AQI (US)
10th April 2026
29AQI (US)
29AQI (US)
11th April 2026
26AQI (US)
26AQI (US)
12th April 2026
25AQI (US)
25AQI (US)
13th April 2026
23AQI (US)
23AQI (US)
14th April 2026
25AQI (US)
25AQI (US)
15th April 2026
22AQI (US)
22AQI (US)
16th April 2026
27AQI (US)
27AQI (US)
17th April 2026
18th April 2026
28AQI (US)
28AQI (US)
19th April 2026
33AQI (US)
33AQI (US)
20th April 2026
26AQI (US)
26AQI (US)
21st April 2026
20AQI (US)
20AQI (US)
22nd April 2026
23rd April 2026
22AQI (US)
22AQI (US)
24th April 2026
19AQI (US)
19AQI (US)
25th April 2026
27AQI (US)
27AQI (US)
26th April 2026
29AQI (US)
29AQI (US)
27th April 2026
18AQI (US)
18AQI (US)
28th April 2026
24AQI (US)
24AQI (US)
29th April 2026
24AQI (US)
24AQI (US)
30th April 2026
23AQI (US)
23AQI (US)
1st May 2026
25AQI (US)
25AQI (US)
2nd May 2026
22AQI (US)
22AQI (US)
3rd May 2026
19AQI (US)
19AQI (US)
4th May 2026
35AQI (US)
35AQI (US)
5th May 2026
31AQI (US)
31AQI (US)
6th May 2026
18AQI (US)
18AQI (US)
7th May 2026
23AQI (US)
23AQI (US)
8th May 2026
29AQI (US)
29AQI (US)
9th May 2026
10th May 2026
29AQI (US)
29AQI (US)
11th May 2026
27AQI (US)
27AQI (US)
12th May 2026
19AQI (US)
19AQI (US)
13th May 2026
24AQI (US)
24AQI (US)
14th May 2026
22AQI (US)
22AQI (US)
15th May 2026
39AQI (US)
39AQI (US)
16th May 2026
45AQI (US)
45AQI (US)
17th May 2026
49AQI (US)
49AQI (US)
18th May 2026
49AQI (US)
49AQI (US)
19th May 2026
43AQI (US)
43AQI (US)
20th May 2026
50AQI (US)
50AQI (US)
21st May 2026
44AQI (US)
44AQI (US)
22nd May 2026
40AQI (US)
40AQI (US)
23rd May 2026
39AQI (US)
39AQI (US)
24th May 2026
41AQI (US)
41AQI (US)
25th May 2026
40AQI (US)
40AQI (US)
26th May 2026
24AQI (US)
24AQI (US)
27th May 2026
15AQI (US)
15AQI (US)
28th May 2026
12AQI (US)
12AQI (US)
29th May 2026
16AQI (US)
16AQI (US)
30th May 2026
20AQI (US)
20AQI (US)
31st May 2026
15AQI (US)
15AQI (US)
1st June 2026
16AQI (US)
16AQI (US)
2nd June 2026
12AQI (US)
12AQI (US)
3rd June 2026
18AQI (US)
18AQI (US)
4th June 2026
24AQI (US)
24AQI (US)
5th June 2026
19AQI (US)
19AQI (US)
6th June 2026
17AQI (US)
17AQI (US)
7th June 2026
22AQI (US)
22AQI (US)
8th June 2026
16AQI (US)
16AQI (US)
9th June 2026
12AQI (US)
12AQI (US)
10th June 2026
17AQI (US)
17AQI (US)
11th June 2026
11AQI (US)
11AQI (US)
12th June 2026
13AQI (US)
13AQI (US)
13th June 2026
16AQI (US)
16AQI (US)
14th June 2026
13AQI (US)
13AQI (US)
15th June 2026
14AQI (US)
14AQI (US)
16th June 2026
14AQI (US)
14AQI (US)
17th June 2026
12AQI (US)
12AQI (US)
18th June 2026
17AQI (US)
17AQI (US)
19th June 2026
15AQI (US)
15AQI (US)
20th June 2026
18AQI (US)
18AQI (US)
21st June 2026
14AQI (US)
14AQI (US)
22nd June 2026
18AQI (US)
18AQI (US)
23rd June 2026
19AQI (US)
19AQI (US)
24th June 2026
12AQI (US)
12AQI (US)
25th June 2026
14AQI (US)
14AQI (US)
26th June 2026
22AQI (US)
22AQI (US)
27th June 2026
21AQI (US)
21AQI (US)
28th June 2026
23AQI (US)
23AQI (US)
29th June 2026
21AQI (US)
21AQI (US)
30th June 2026
46AQI (US)
46AQI (US)
1st July 2026
65AQI (US)
65AQI (US)
2nd July 2026
25AQI (US)
25AQI (US)
3rd July 2026
13AQI (US)
13AQI (US)
4th July 2026
18AQI (US)
18AQI (US)
5th July 2026
42AQI (US)
42AQI (US)
6th July 2026
36AQI (US)
36AQI (US)
7th July 2026
22AQI (US)
22AQI (US)
8th July 2026
20AQI (US)
20AQI (US)
9th July 2026
21AQI (US)
21AQI (US)
10th July 2026
15AQI (US)
15AQI (US)
11th July 2026
22AQI (US)
22AQI (US)
12th July 2026
22AQI (US)
22AQI (US)
13th July 2026
24AQI (US)
24AQI (US)
14th July 2026
26AQI (US)
26AQI (US)
15th July 2026
43AQI (US)
43AQI (US)
16th July 2026
115AQI (US)
115AQI (US)
17th July 2026
176AQI (US)
176AQI (US)
18th July 2026
74AQI (US)
74AQI (US)
19th July 2026
130AQI (US)
130AQI (US)
20th July 2026
123AQI (US)
123AQI (US)
21st July 2026
46AQI (US)
46AQI (US)
22nd July 2026
20AQI (US)
20AQI (US)
23rd July 2026
40AQI (US)
40AQI (US)
24th July 2026
33AQI (US)
33AQI (US)
25th July 2026
32AQI (US)
32AQI (US)
26th July 2026
48AQI (US)
48AQI (US)
27th July 2026
48AQI (US)
48AQI (US)
28th July 2026
44AQI (US)
44AQI (US)
29th July 2026
32AQI (US)
32AQI (US)
30th July 2026
38AQI (US)
38AQI (US)
31st July 2026
32AQI (US)
32AQI (US)
1st August 2026
37AQI (US)
37AQI (US)
2nd August 2026
41AQI (US)
41AQI (US)
3rd August 2026
37AQI (US)
37AQI (US)
4th August 2026
41AQI (US)
41AQI (US)
5th August 2026
51AQI (US)
51AQI (US)
6th August 2026
55AQI (US)
55AQI (US)
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
33AQI (US)
37AQI (US)
32AQI (US)
26AQI (US)
30AQI (US)
18AQI (US)
47AQI (US)
44AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202632AQI (US)
27
4
28
31
28
30
30
25
2
3
1
4
2
203
8
3
1
Highest AQI (US) recorded in
July47AQI (US)
Lowest AQI (US) recorded in
June18AQI (US)
202535AQI (US)
30
1
27
1
30
1
29
1
31
19
11
18
12
1
19
9
3
26
4
27
4
24
6
21
10
301
60
4
Highest AQI (US) recorded in
July48AQI (US)
Lowest AQI (US) recorded in
May22AQI (US)
202433AQI (US)
27
3
24
5
29
2
30
31
29
30
1
28
3
29
1
28
3
29
1
30
1
344
20
Highest AQI (US) recorded in
July35AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202340AQI (US)
22
9
26
2
28
3
24
6
26
5
9
18
1
2
24
6
1
22
9
30
30
1
26
3
29
2
296
64
2
2
Highest AQI (US) recorded in
June72AQI (US)
Lowest AQI (US) recorded in
October29AQI (US)
202238AQI (US)
24
6
13
8
28
3
22
2
27
4
27
3
21
1
1
27
2
26
5
24
6
22
9
262
49
Highest AQI (US) recorded in
January44AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
202140AQI (US)
19
10
17
11
27
4
23
6
1
27
4
29
1
17
14
24
7
30
30
1
24
6
22
9
289
73
1
Highest AQI (US) recorded in
February48AQI (US)
Lowest AQI (US) recorded in
October32AQI (US)
202035AQI (US)
11
2
19
1
18
26
4
24
7
31
30
30
1
24
6
22
9
235
30
Highest AQI (US) recorded in
June37AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Most Polluted Year Recorded
2023(Avg.)
40AQI (US)Least Polluted Year Recorded
2026(Avg.)
32AQI (US)Winthrop Harbor's annual 2026 AQI (US) (32) shows an average percentage change of -12.6% (improved AQI (US)) compared to previous years: 2020 (35), 2021 (40), 2022 (38), 2023 (40), 2024 (33), 2025 (35).
