Alton, 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
Alton, Illinois, United States
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
1st Aug 2025
112AQILowest AQI recorded on
21st Aug 2025
20AQISame Day Analysis (5th August):
On this day, AQI across the 2 years varied significantly: 2026 ranks 1st highest AQI at 52 of Moderate air quality on the same day.
Day & Night AQI Trend: 5th Aug - 6th Aug 2026
Alton, Illinois, United States
AQI
Day
Night
.
5 AM5th Aug 2026
8 PM
4 AM6th Aug 2026
Day time
Avg. Highest Time
10AM5th Aug
54AQI
Avg. Lowest Time
3PM5th Aug
48AQI
Night time
Avg. Highest Time
10PM5th Aug
51AQI
Avg. Lowest Time
3AM6th Aug
44AQI
In the last 24 hours,
Alton's AQI reached its highest point of 54 at 10 AM during the Day, while the lowest point, 44, was recorded at 3 AM during the Night between 5th Aug and 6th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Alton, 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 2026335 AMAQI
8th Jul 2026386 AMAQI
8th Jul 2026337 AMAQI
8th Jul 2026298 AMAQI
8th Jul 2026289 AMAQI
8th Jul 20263310 AMAQI
8th Jul 20263011 AMAQI
8th Jul 20263012 PMAQI
8th Jul 2026231 PMAQI
8th Jul 2026382 PMAQI
8th Jul 2026283 PMAQI
8th Jul 2026294 PMAQI
8th Jul 2026295 PMAQI
8th Jul 2026276 PMAQI
8th Jul 2026337 PMAQI
8th Jul 2026338 PMAQI
8th Jul 2026339 PMAQI
8th Jul 20263310 PMAQI
8th Jul 20263311 PMAQI
9th Jul 20264612 AMAQI
9th Jul 2026601 AMAQI
9th Jul 2026402 AMAQI
9th Jul 2026163 AMAQI
9th Jul 2026424 AMAQI
27°C21/34°C
9th Jul 2026425 AMAQI
9th Jul 2026426 AMAQI
9th Jul 2026287 AMAQI
9th Jul 2026228 AMAQI
9th Jul 2026329 AMAQI
9th Jul 20263010 AMAQI
9th Jul 20262811 AMAQI
9th Jul 20263412 PMAQI
9th Jul 2026281 PMAQI
9th Jul 2026222 PMAQI
9th Jul 2026283 PMAQI
9th Jul 2026424 PMAQI
9th Jul 2026315 PMAQI
9th Jul 2026386 PMAQI
9th Jul 2026127 PMAQI
9th Jul 2026338 PMAQI
9th Jul 2026389 PMAQI
9th Jul 20262410 PMAQI
9th Jul 20262611 PMAQI
10th Jul 20262612 AMAQI
10th Jul 2026241 AMAQI
10th Jul 2026312 AMAQI
10th Jul 2026143 AMAQI
10th Jul 2026204 AMAQI
27°C23/34°C
10th Jul 2026255 AMAQI
10th Jul 2026116 AMAQI
10th Jul 2026177 AMAQI
10th Jul 2026388 AMAQI
10th Jul 2026249 AMAQI
10th Jul 20262610 AMAQI
10th Jul 20264211 AMAQI
10th Jul 20263812 PMAQI
10th Jul 2026261 PMAQI
10th Jul 2026342 PMAQI
10th Jul 2026323 PMAQI
10th Jul 2026294 PMAQI
10th Jul 2026315 PMAQI
10th Jul 2026256 PMAQI
10th Jul 2026207 PMAQI
10th Jul 2026248 PMAQI
10th Jul 2026289 PMAQI
10th Jul 20262510 PMAQI
10th Jul 20262711 PMAQI
11th Jul 20262712 AMAQI
11th Jul 2026201 AMAQI
11th Jul 2026252 AMAQI
11th Jul 2026183 AMAQI
11th Jul 2026184 AMAQI
28°C22/35°C
11th Jul 2026175 AMAQI
11th Jul 2026176 AMAQI
11th Jul 2026207 AMAQI
11th Jul 2026158 AMAQI
11th Jul 2026169 AMAQI
11th Jul 20262310 AMAQI
11th Jul 20262211 AMAQI
11th Jul 20262012 PMAQI
11th Jul 2026231 PMAQI
11th Jul 2026182 PMAQI
11th Jul 2026253 PMAQI
11th Jul 2026214 PMAQI
11th Jul 2026105 PMAQI
11th Jul 2026246 PMAQI
11th Jul 202697 PMAQI
11th Jul 2026338 PMAQI
11th Jul 2026199 PMAQI
11th Jul 20261910 PMAQI
11th Jul 20262411 PMAQI
12th Jul 20262112 AMAQI
12th Jul 2026291 AMAQI
12th Jul 2026172 AMAQI
12th Jul 2026103 AMAQI
12th Jul 202684 AMAQI
24°C21/28°C
12th Jul 2026185 AMAQI
12th Jul 2026196 AMAQI
12th Jul 2026147 AMAQI
12th Jul 2026138 AMAQI
12th Jul 2026139 AMAQI
12th Jul 20261610 AMAQI
12th Jul 20262111 AMAQI
12th Jul 20261712 PMAQI
12th Jul 2026141 PMAQI
12th Jul 2026142 PMAQI
12th Jul 2026163 PMAQI
12th Jul 2026164 PMAQI
12th Jul 2026165 PMAQI
12th Jul 2026236 PMAQI
12th Jul 2026187 PMAQI
12th Jul 2026208 PMAQI
12th Jul 2026279 PMAQI
12th Jul 20262210 PMAQI
12th Jul 20263311 PMAQI
13th Jul 20262412 AMAQI
13th Jul 2026271 AMAQI
13th Jul 2026242 AMAQI
13th Jul 2026213 AMAQI
13th Jul 2026224 AMAQI
26°C20/33°C
13th Jul 2026245 AMAQI
13th Jul 2026226 AMAQI
13th Jul 2026247 AMAQI
13th Jul 2026208 AMAQI
13th Jul 2026239 AMAQI
13th Jul 20262610 AMAQI
13th Jul 20263111 AMAQI
13th Jul 20263212 PMAQI
13th Jul 2026361 PMAQI
13th Jul 2026272 PMAQI
13th Jul 2026283 PMAQI
13th Jul 2026274 PMAQI
13th Jul 2026285 PMAQI
13th Jul 2026276 PMAQI
13th Jul 2026247 PMAQI
13th Jul 2026268 PMAQI
13th Jul 2026249 PMAQI
13th Jul 20262710 PMAQI
13th Jul 20264211 PMAQI
14th Jul 20264212 AMAQI
14th Jul 2026281 AMAQI
14th Jul 2026282 AMAQI
14th Jul 2026303 AMAQI
14th Jul 2026274 AMAQI
27°C20/34°C
14th Jul 2026215 AMAQI
14th Jul 2026246 AMAQI
14th Jul 2026287 AMAQI
14th Jul 2026288 AMAQI
14th Jul 2026329 AMAQI
14th Jul 20263210 AMAQI
14th Jul 20263711 AMAQI
14th Jul 20263212 PMAQI
14th Jul 2026381 PMAQI
14th Jul 2026312 PMAQI
14th Jul 2026303 PMAQI
14th Jul 2026284 PMAQI
14th Jul 2026285 PMAQI
14th Jul 2026266 PMAQI
14th Jul 2026187 PMAQI
14th Jul 2026188 PMAQI
14th Jul 2026189 PMAQI
14th Jul 20262210 PMAQI
14th Jul 20261811 PMAQI
15th Jul 20261812 AMAQI
15th Jul 2026421 AMAQI
15th Jul 2026282 AMAQI
15th Jul 2026243 AMAQI
15th Jul 2026264 AMAQI
28°C20/36°C
15th Jul 2026265 AMAQI
15th Jul 2026266 AMAQI
15th Jul 2026247 AMAQI
15th Jul 2026268 AMAQI
15th Jul 2026329 AMAQI
15th Jul 20265010 AMAQI
15th Jul 20264711 AMAQI
15th Jul 20264212 PMAQI
15th Jul 2026321 PMAQI
15th Jul 2026282 PMAQI
15th Jul 2026263 PMAQI
15th Jul 2026284 PMAQI
15th Jul 2026265 PMAQI
15th Jul 2026266 PMAQI
15th Jul 2026247 PMAQI
15th Jul 2026228 PMAQI
15th Jul 2026349 PMAQI
15th Jul 20263010 PMAQI
15th Jul 20263011 PMAQI
16th Jul 20262712 AMAQI
16th Jul 2026261 AMAQI
16th Jul 2026272 AMAQI
16th Jul 2026263 AMAQI
16th Jul 2026284 AMAQI
28°C21/37°C
16th Jul 2026325 AMAQI
16th Jul 2026306 AMAQI
16th Jul 2026327 AMAQI
16th Jul 2026298 AMAQI
16th Jul 2026399 AMAQI
16th Jul 20263610 AMAQI
16th Jul 20264411 AMAQI
16th Jul 20263312 PMAQI
16th Jul 2026301 PMAQI
16th Jul 2026282 PMAQI
16th Jul 2026183 PMAQI
16th Jul 2026154 PMAQI
16th Jul 2026165 PMAQI
16th Jul 2026146 PMAQI
16th Jul 2026147 PMAQI
16th Jul 2026138 PMAQI
16th Jul 2026139 PMAQI
16th Jul 20261410 PMAQI
16th Jul 20262011 PMAQI
17th Jul 20262312 AMAQI
17th Jul 2026151 AMAQI
17th Jul 2026312 AMAQI
17th Jul 2026313 AMAQI
17th Jul 2026484 AMAQI
27°C22/33°C
17th Jul 2026515 AMAQI
17th Jul 2026486 AMAQI
17th Jul 2026517 AMAQI
17th Jul 2026488 AMAQI
17th Jul 2026469 AMAQI
17th Jul 20264210 AMAQI
17th Jul 20264211 AMAQI
17th Jul 20264212 PMAQI
17th Jul 2026441 PMAQI
17th Jul 2026462 PMAQI
17th Jul 2026513 PMAQI
17th Jul 2026484 PMAQI
17th Jul 2026505 PMAQI
17th Jul 2026526 PMAQI
17th Jul 2026517 PMAQI
17th Jul 2026528 PMAQI
17th Jul 2026539 PMAQI
17th Jul 20265310 PMAQI
17th Jul 20265111 PMAQI
18th Jul 20265212 AMAQI
18th Jul 2026521 AMAQI
18th Jul 2026532 AMAQI
18th Jul 2026503 AMAQI
18th Jul 2026514 AMAQI
28°C23/35°C
18th Jul 2026525 AMAQI
18th Jul 2026496 AMAQI
18th Jul 2026507 AMAQI
18th Jul 2026518 AMAQI
18th Jul 2026509 AMAQI
18th Jul 20265010 AMAQI
18th Jul 20265411 AMAQI
18th Jul 20265112 PMAQI
18th Jul 2026511 PMAQI
18th Jul 2026512 PMAQI
18th Jul 2026533 PMAQI
18th Jul 2026504 PMAQI
18th Jul 2026545 PMAQI
18th Jul 2026516 PMAQI
18th Jul 2026507 PMAQI
18th Jul 2026518 PMAQI
18th Jul 2026529 PMAQI
18th Jul 20265110 PMAQI
18th Jul 20265211 PMAQI
19th Jul 20264812 AMAQI
19th Jul 2026511 AMAQI
19th Jul 2026482 AMAQI
19th Jul 2026483 AMAQI
19th Jul 2026424 AMAQI
29°C23/36°C
19th Jul 2026445 AMAQI
19th Jul 2026466 AMAQI
19th Jul 2026507 AMAQI
19th Jul 2026508 AMAQI
19th Jul 2026469 AMAQI
19th Jul 20265010 AMAQI
19th Jul 20265011 AMAQI
19th Jul 20265212 PMAQI
19th Jul 2026521 PMAQI
19th Jul 2026562 PMAQI
19th Jul 2026533 PMAQI
19th Jul 2026464 PMAQI
19th Jul 2026425 PMAQI
19th Jul 2026516 PMAQI
19th Jul 2026587 PMAQI
19th Jul 2026598 PMAQI
19th Jul 2026699 PMAQI
19th Jul 20268810 PMAQI
19th Jul 20269711 PMAQI
20th Jul 20269612 AMAQI
20th Jul 20261081 AMAQI
20th Jul 20261102 AMAQI
20th Jul 20261353 AMAQI
20th Jul 20261364 AMAQI
28°C24/34°C
20th Jul 20261495 AMAQI
20th Jul 20261506 AMAQI
20th Jul 20261527 AMAQI
20th Jul 20261528 AMAQI
20th Jul 20261539 AMAQI
20th Jul 202615310 AMAQI
20th Jul 202615411 AMAQI
20th Jul 202615312 PMAQI
20th Jul 20261421 PMAQI
20th Jul 20261362 PMAQI
20th Jul 20261163 PMAQI
20th Jul 20261114 PMAQI
20th Jul 2026975 PMAQI
20th Jul 2026866 PMAQI
20th Jul 2026897 PMAQI
20th Jul 2026868 PMAQI
20th Jul 2026859 PMAQI
20th Jul 20268011 PMAQI
21st Jul 20268012 AMAQI
21st Jul 2026781 AMAQI
21st Jul 2026782 AMAQI
21st Jul 2026733 AMAQI
21st Jul 2026624 AMAQI
29°C21/37°C
21st Jul 2026565 AMAQI
21st Jul 2026536 AMAQI
21st Jul 2026547 AMAQI
21st Jul 2026538 AMAQI
21st Jul 2026549 AMAQI
21st Jul 20265610 AMAQI
21st Jul 20265311 AMAQI
21st Jul 20264812 PMAQI
21st Jul 2026421 PMAQI
21st Jul 2026502 PMAQI
21st Jul 2026513 PMAQI
21st Jul 2026554 PMAQI
21st Jul 2026545 PMAQI
21st Jul 2026546 PMAQI
21st Jul 2026587 PMAQI
21st Jul 2026578 PMAQI
21st Jul 2026559 PMAQI
21st Jul 20265310 PMAQI
21st Jul 20265411 PMAQI
22nd Jul 20265012 AMAQI
22nd Jul 2026461 AMAQI
22nd Jul 2026482 AMAQI
22nd Jul 2026483 AMAQI
22nd Jul 2026504 AMAQI
30°C24/37°C
22nd Jul 2026485 AMAQI
22nd Jul 2026516 AMAQI
22nd Jul 2026507 AMAQI
22nd Jul 2026518 AMAQI
22nd Jul 2026539 AMAQI
22nd Jul 20265110 AMAQI
22nd Jul 20264411 AMAQI
22nd Jul 20264612 PMAQI
22nd Jul 2026501 PMAQI
22nd Jul 2026402 PMAQI
22nd Jul 2026513 PMAQI
22nd Jul 2026424 PMAQI
22nd Jul 2026405 PMAQI
22nd Jul 2026526 PMAQI
22nd Jul 2026427 PMAQI
22nd Jul 2026368 PMAQI
22nd Jul 2026549 PMAQI
22nd Jul 20265410 PMAQI
22nd Jul 20263611 PMAQI
23rd Jul 20264612 AMAQI
23rd Jul 2026461 AMAQI
23rd Jul 2026442 AMAQI
23rd Jul 2026383 AMAQI
23rd Jul 2026364 AMAQI
23°C18/30°C
23rd Jul 2026525 AMAQI
23rd Jul 2026516 AMAQI
23rd Jul 2026507 AMAQI
23rd Jul 2026468 AMAQI
23rd Jul 2026499 AMAQI
23rd Jul 20264610 AMAQI
23rd Jul 20264611 AMAQI
23rd Jul 20264012 PMAQI
23rd Jul 2026581 PMAQI
23rd Jul 2026382 PMAQI
23rd Jul 2026323 PMAQI
23rd Jul 2026254 PMAQI
23rd Jul 2026485 PMAQI
23rd Jul 2026236 PMAQI
23rd Jul 2026537 PMAQI
23rd Jul 2026428 PMAQI
23rd Jul 2026239 PMAQI
23rd Jul 20263310 PMAQI
23rd Jul 20264011 PMAQI
24th Jul 20264612 AMAQI
24th Jul 2026381 AMAQI
24th Jul 2026362 AMAQI
24th Jul 2026253 AMAQI
24th Jul 2026364 AMAQI
23°C17/29°C
24th Jul 2026465 AMAQI
24th Jul 2026386 AMAQI
24th Jul 2026487 AMAQI
24th Jul 2026428 AMAQI
24th Jul 2026429 AMAQI
24th Jul 20264010 AMAQI
24th Jul 20264611 AMAQI
24th Jul 20264412 PMAQI
24th Jul 2026461 PMAQI
24th Jul 2026582 PMAQI
24th Jul 2026293 PMAQI
24th Jul 2026424 PMAQI
24th Jul 2026425 PMAQI
24th Jul 2026446 PMAQI
24th Jul 2026237 PMAQI
24th Jul 2026258 PMAQI
24th Jul 2026509 PMAQI
24th Jul 20264210 PMAQI
24th Jul 20264011 PMAQI
25th Jul 20264612 AMAQI
25th Jul 2026461 AMAQI
25th Jul 2026422 AMAQI
25th Jul 2026383 AMAQI
25th Jul 2026424 AMAQI
22°C16/30°C
25th Jul 2026445 AMAQI
25th Jul 2026426 AMAQI
25th Jul 2026407 AMAQI
25th Jul 2026508 AMAQI
25th Jul 2026559 AMAQI
25th Jul 20265110 AMAQI
25th Jul 20265111 AMAQI
25th Jul 20264912 PMAQI
25th Jul 2026441 PMAQI
25th Jul 2026482 PMAQI
25th Jul 2026533 PMAQI
25th Jul 2026544 PMAQI
25th Jul 2026545 PMAQI
25th Jul 2026526 PMAQI
25th Jul 2026517 PMAQI
25th Jul 2026568 PMAQI
25th Jul 2026629 PMAQI
25th Jul 20265810 PMAQI
25th Jul 20266011 PMAQI
26th Jul 20265512 AMAQI
26th Jul 2026551 AMAQI
26th Jul 2026532 AMAQI
26th Jul 2026523 AMAQI
26th Jul 2026524 AMAQI
26°C20/33°C
26th Jul 2026505 AMAQI
26th Jul 2026516 AMAQI
26th Jul 2026507 AMAQI
26th Jul 2026538 AMAQI
26th Jul 2026519 AMAQI
26th Jul 20265110 AMAQI
26th Jul 20265311 AMAQI
26th Jul 20265412 PMAQI
26th Jul 2026531 PMAQI
26th Jul 2026562 PMAQI
26th Jul 2026543 PMAQI
26th Jul 2026574 PMAQI
26th Jul 2026575 PMAQI
26th Jul 2026566 PMAQI
26th Jul 2026557 PMAQI
26th Jul 2026568 PMAQI
26th Jul 2026559 PMAQI
26th Jul 20265710 PMAQI
26th Jul 20265411 PMAQI
27th Jul 20265512 AMAQI
27th Jul 2026571 AMAQI
27th Jul 2026582 AMAQI
27th Jul 2026553 AMAQI
27th Jul 2026554 AMAQI
31°C23/39°C
27th Jul 2026565 AMAQI
27th Jul 2026536 AMAQI
27th Jul 2026547 AMAQI
27th Jul 2026508 AMAQI
27th Jul 2026529 AMAQI
27th Jul 20265110 AMAQI
27th Jul 20265211 AMAQI
27th Jul 20265612 PMAQI
27th Jul 2026571 PMAQI
27th Jul 2026582 PMAQI
27th Jul 2026603 PMAQI
27th Jul 2026624 PMAQI
27th Jul 2026625 PMAQI
27th Jul 2026606 PMAQI
27th Jul 2026627 PMAQI
27th Jul 2026628 PMAQI
27th Jul 2026599 PMAQI
27th Jul 20265710 PMAQI
27th Jul 20265611 PMAQI
28th Jul 20265012 AMAQI
28th Jul 2026511 AMAQI
28th Jul 2026512 AMAQI
28th Jul 2026503 AMAQI
28th Jul 2026544 AMAQI
32°C26/39°C
28th Jul 2026545 AMAQI
28th Jul 2026526 AMAQI
28th Jul 2026557 AMAQI
28th Jul 2026568 AMAQI
28th Jul 2026559 AMAQI
28th Jul 20265610 AMAQI
28th Jul 20265711 AMAQI
28th Jul 20266212 PMAQI
28th Jul 2026571 PMAQI
28th Jul 2026642 PMAQI
28th Jul 2026623 PMAQI
28th Jul 2026604 PMAQI
28th Jul 2026625 PMAQI
28th Jul 2026596 PMAQI
28th Jul 2026587 PMAQI
28th Jul 2026588 PMAQI
28th Jul 2026569 PMAQI
28th Jul 20265510 PMAQI
28th Jul 20265711 PMAQI
29th Jul 20265512 AMAQI
29th Jul 2026551 AMAQI
29th Jul 2026552 AMAQI
29th Jul 2026553 AMAQI
29th Jul 2026544 AMAQI
30°C25/37°C
29th Jul 2026525 AMAQI
29th Jul 2026556 AMAQI
29th Jul 2026547 AMAQI
29th Jul 2026538 AMAQI
29th Jul 2026519 AMAQI
29th Jul 20264210 AMAQI
29th Jul 20263811 AMAQI
29th Jul 20263412 PMAQI
29th Jul 2026421 PMAQI
29th Jul 2026402 PMAQI
29th Jul 2026363 PMAQI
29th Jul 2026404 PMAQI
29th Jul 2026385 PMAQI
29th Jul 2026426 PMAQI
29th Jul 2026257 PMAQI
29th Jul 2026238 PMAQI
29th Jul 2026509 PMAQI
29th Jul 20264610 PMAQI
29th Jul 20262711 PMAQI
30th Jul 20264612 AMAQI
30th Jul 2026291 AMAQI
30th Jul 2026382 AMAQI
30th Jul 2026343 AMAQI
30th Jul 2026274 AMAQI
26°C20/33°C
30th Jul 2026465 AMAQI
30th Jul 2026386 AMAQI
30th Jul 2026467 AMAQI
30th Jul 2026468 AMAQI
30th Jul 2026469 AMAQI
30th Jul 20265010 AMAQI
30th Jul 20264411 AMAQI
30th Jul 20265012 PMAQI
30th Jul 2026421 PMAQI
30th Jul 2026402 PMAQI
30th Jul 2026463 PMAQI
30th Jul 2026444 PMAQI
30th Jul 2026445 PMAQI
30th Jul 2026466 PMAQI
30th Jul 2026427 PMAQI
30th Jul 2026448 PMAQI
30th Jul 2026469 PMAQI
30th Jul 20264610 PMAQI
30th Jul 20264411 PMAQI
31st Jul 20264012 AMAQI
31st Jul 2026421 AMAQI
31st Jul 2026442 AMAQI
31st Jul 2026483 AMAQI
31st Jul 2026424 AMAQI
26°C19/34°C
31st Jul 2026445 AMAQI
31st Jul 2026426 AMAQI
31st Jul 2026447 AMAQI
31st Jul 2026468 AMAQI
31st Jul 2026489 AMAQI
31st Jul 20265010 AMAQI
31st Jul 20264411 AMAQI
31st Jul 20264412 PMAQI
31st Jul 2026461 PMAQI
31st Jul 2026462 PMAQI
31st Jul 2026423 PMAQI
31st Jul 2026344 PMAQI
31st Jul 2026425 PMAQI
31st Jul 2026446 PMAQI
31st Jul 2026427 PMAQI
31st Jul 2026508 PMAQI
31st Jul 2026519 PMAQI
31st Jul 20265210 PMAQI
31st Jul 20265211 PMAQI
1st Aug 20265212 AMAQI
1st Aug 2026511 AMAQI
1st Aug 2026482 AMAQI
1st Aug 2026343 AMAQI
1st Aug 2026344 AMAQI
23°C21/27°C
1st Aug 2026465 AMAQI
1st Aug 2026466 AMAQI
1st Aug 2026407 AMAQI
1st Aug 2026368 AMAQI
1st Aug 2026309 AMAQI
1st Aug 20263410 AMAQI
1st Aug 20264211 AMAQI
1st Aug 20264212 PMAQI
1st Aug 2026461 PMAQI
1st Aug 2026462 PMAQI
1st Aug 2026513 PMAQI
1st Aug 2026494 PMAQI
1st Aug 2026465 PMAQI
1st Aug 2026366 PMAQI
1st Aug 2026347 PMAQI
1st Aug 2026518 PMAQI
1st Aug 2026319 PMAQI
1st Aug 20263610 PMAQI
1st Aug 20263111 PMAQI
2nd Aug 20262912 AMAQI
2nd Aug 2026251 AMAQI
2nd Aug 2026302 AMAQI
2nd Aug 2026403 AMAQI
2nd Aug 2026404 AMAQI
22°C19/24°C
2nd Aug 2026465 AMAQI
2nd Aug 2026466 AMAQI
2nd Aug 2026447 AMAQI
2nd Aug 2026448 AMAQI
2nd Aug 2026509 AMAQI
2nd Aug 20265010 AMAQI
2nd Aug 20264811 AMAQI
2nd Aug 20265212 PMAQI
2nd Aug 2026521 PMAQI
2nd Aug 2026512 PMAQI
2nd Aug 2026523 PMAQI
2nd Aug 2026514 PMAQI
2nd Aug 2026515 PMAQI
2nd Aug 2026516 PMAQI
2nd Aug 2026487 PMAQI
2nd Aug 2026508 PMAQI
2nd Aug 2026449 PMAQI
2nd Aug 20264610 PMAQI
2nd Aug 20265011 PMAQI
3rd Aug 20264612 AMAQI
3rd Aug 2026481 AMAQI
3rd Aug 2026462 AMAQI
3rd Aug 2026443 AMAQI
3rd Aug 2026444 AMAQI
23°C19/30°C
3rd Aug 2026465 AMAQI
3rd Aug 2026466 AMAQI
3rd Aug 2026487 AMAQI
3rd Aug 2026488 AMAQI
3rd Aug 2026469 AMAQI
3rd Aug 20264810 AMAQI
3rd Aug 20264911 AMAQI
3rd Aug 20265112 PMAQI
3rd Aug 2026461 PMAQI
3rd Aug 2026502 PMAQI
3rd Aug 2026513 PMAQI
3rd Aug 2026524 PMAQI
3rd Aug 2026495 PMAQI
3rd Aug 2026496 PMAQI
3rd Aug 2026507 PMAQI
3rd Aug 2026488 PMAQI
3rd Aug 2026509 PMAQI
3rd Aug 20265110 PMAQI
3rd Aug 20265311 PMAQI
4th Aug 20266212 AMAQI
4th Aug 2026661 AMAQI
4th Aug 2026642 AMAQI
4th Aug 2026563 AMAQI
4th Aug 2026534 AMAQI
24°C18/32°C
4th Aug 2026535 AMAQI
4th Aug 2026536 AMAQI
4th Aug 2026517 AMAQI
4th Aug 2026528 AMAQI
4th Aug 2026529 AMAQI
4th Aug 20265410 AMAQI
4th Aug 20265411 AMAQI
4th Aug 20265312 PMAQI
4th Aug 2026531 PMAQI
4th Aug 2026532 PMAQI
4th Aug 2026513 PMAQI
4th Aug 2026504 PMAQI
4th Aug 2026535 PMAQI
4th Aug 2026546 PMAQI
4th Aug 2026547 PMAQI
4th Aug 2026518 PMAQI
4th Aug 2026539 PMAQI
4th Aug 20265110 PMAQI
4th Aug 20265111 PMAQI
5th Aug 20265212 AMAQI
5th Aug 2026541 AMAQI
5th Aug 2026532 AMAQI
5th Aug 2026523 AMAQI
5th Aug 2026514 AMAQI
25°C19/32°C
5th Aug 2026505 AMAQI
5th Aug 2026516 AMAQI
5th Aug 2026537 AMAQI
5th Aug 2026538 AMAQI
5th Aug 2026519 AMAQI
5th Aug 20265410 AMAQI
5th Aug 20265311 AMAQI
5th Aug 20265312 PMAQI
5th Aug 2026531 PMAQI
5th Aug 2026522 PMAQI
5th Aug 2026483 PMAQI
5th Aug 2026514 PMAQI
5th Aug 2026525 PMAQI
5th Aug 2026526 PMAQI
5th Aug 2026507 PMAQI
5th Aug 2026518 PMAQI
5th Aug 2026509 PMAQI
5th Aug 20265110 PMAQI
5th Aug 20265011 PMAQI
6th Aug 20264612 AMAQI
6th Aug 2026481 AMAQI
6th Aug 2026502 AMAQI
6th Aug 2026443 AMAQI
6th Aug 2026484 AMAQI
26°C20/34°C
6th Aug 2026445 AMAQI
5 AM6th Aug 2026446 AMAQI
6th Aug 2026467 AMAQI
6th Aug 2026488 AMAQI
6th Aug 2026519 AMAQI
6th Aug 20262510 AMAQI
6th Aug 20263811 AMAQI
6th Aug 20263812 PMAQI
12 PM6th Aug 2026311 PMAQI
6th Aug 2026342 PMAQI
6th Aug 2026343 PMAQI
6th Aug 2026424 PMAQI
6th Aug 2026255 PMAQI
6th Aug 2026276 PMAQI
6th Aug 2026407 PMAQI
6th Aug 2026218 PMAQI
8 PM6th Aug 2026499 PMAQI
6th Aug 20265210 PMAQI
6th Aug 20262111 PMAQI
12 AM
4 AM
23°C21/28°C
Day time
Avg. Highest Time
5 AM - 6 PM
45AQI
14 hours / Day
420 hours / Month
Avg. Lowest Time
7 PM
40AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 6 PM (Avg. 45), while the lowest AQI was between 7 PM to 7 PM (Avg. 40).
Night time
Avg. Highest Time
12 AM - 2 AM
45AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
3 AM - 4 AM
42AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 2 AM (Avg. 45), while the lowest AQI was between 3 AM to 4 AM (Avg. 42).
2026 Days Vs Air Quality
Alton, Illinois, United States
2026
90%
192
10%
21
0.4%
1
Total number of days with different AQI categories in last 218 days in 2026 (147 days remaining)
Good
192 DaysModerate
21 DaysPoor
1 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2026, 90% 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
Alton, 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
50AQI (US)
50AQI (US)
2nd January 2026
46AQI (US)
46AQI (US)
3rd January 2026
32AQI (US)
32AQI (US)
4th January 2026
53AQI (US)
53AQI (US)
5th January 2026
40AQI (US)
40AQI (US)
6th January 2026
31AQI (US)
31AQI (US)
7th January 2026
51AQI (US)
51AQI (US)
8th January 2026
37AQI (US)
37AQI (US)
9th January 2026
23AQI (US)
23AQI (US)
10th January 2026
28AQI (US)
28AQI (US)
11th January 2026
14AQI (US)
14AQI (US)
12th January 2026
27AQI (US)
27AQI (US)
13th January 2026
24AQI (US)
24AQI (US)
14th January 2026
15AQI (US)
15AQI (US)
15th January 2026
20AQI (US)
20AQI (US)
16th January 2026
18AQI (US)
18AQI (US)
17th January 2026
21AQI (US)
21AQI (US)
18th January 2026
17AQI (US)
17AQI (US)
19th January 2026
17AQI (US)
17AQI (US)
20th January 2026
33AQI (US)
33AQI (US)
21st January 2026
37AQI (US)
37AQI (US)
22nd January 2026
50AQI (US)
50AQI (US)
23rd January 2026
51AQI (US)
51AQI (US)
24th January 2026
30AQI (US)
30AQI (US)
25th January 2026
38AQI (US)
38AQI (US)
26th January 2026
35AQI (US)
35AQI (US)
27th January 2026
26AQI (US)
26AQI (US)
28th January 2026
29AQI (US)
29AQI (US)
29th January 2026
43AQI (US)
43AQI (US)
30th January 2026
56AQI (US)
56AQI (US)
31st January 2026
32AQI (US)
32AQI (US)
1st February 2026
38AQI (US)
38AQI (US)
2nd February 2026
45AQI (US)
45AQI (US)
3rd February 2026
44AQI (US)
44AQI (US)
4th February 2026
36AQI (US)
36AQI (US)
5th February 2026
48AQI (US)
48AQI (US)
6th February 2026
38AQI (US)
38AQI (US)
7th February 2026
30AQI (US)
30AQI (US)
8th February 2026
24AQI (US)
24AQI (US)
9th February 2026
46AQI (US)
46AQI (US)
10th February 2026
42AQI (US)
42AQI (US)
11th February 2026
30AQI (US)
30AQI (US)
12th February 2026
55AQI (US)
55AQI (US)
13th February 2026
45AQI (US)
45AQI (US)
14th February 2026
51AQI (US)
51AQI (US)
15th February 2026
39AQI (US)
39AQI (US)
16th February 2026
39AQI (US)
39AQI (US)
17th February 2026
46AQI (US)
46AQI (US)
18th February 2026
48AQI (US)
48AQI (US)
19th February 2026
43AQI (US)
43AQI (US)
20th February 2026
30AQI (US)
30AQI (US)
21st February 2026
28AQI (US)
28AQI (US)
22nd February 2026
22AQI (US)
22AQI (US)
23rd February 2026
29AQI (US)
29AQI (US)
24th February 2026
46AQI (US)
46AQI (US)
25th February 2026
48AQI (US)
48AQI (US)
26th February 2026
37AQI (US)
37AQI (US)
27th February 2026
45AQI (US)
45AQI (US)
28th February 2026
33AQI (US)
33AQI (US)
1st March 2026
29AQI (US)
29AQI (US)
2nd March 2026
38AQI (US)
38AQI (US)
3rd March 2026
38AQI (US)
38AQI (US)
4th March 2026
39AQI (US)
39AQI (US)
5th March 2026
36AQI (US)
36AQI (US)
6th March 2026
34AQI (US)
34AQI (US)
7th March 2026
32AQI (US)
32AQI (US)
8th March 2026
36AQI (US)
36AQI (US)
9th March 2026
34AQI (US)
34AQI (US)
10th March 2026
31AQI (US)
31AQI (US)
11th March 2026
34AQI (US)
34AQI (US)
12th March 2026
27AQI (US)
27AQI (US)
13th March 2026
33AQI (US)
33AQI (US)
14th March 2026
28AQI (US)
28AQI (US)
15th March 2026
28AQI (US)
28AQI (US)
16th March 2026
28AQI (US)
28AQI (US)
17th March 2026
31AQI (US)
31AQI (US)
18th March 2026
25AQI (US)
25AQI (US)
19th March 2026
57AQI (US)
57AQI (US)
20th March 2026
55AQI (US)
55AQI (US)
21st March 2026
44AQI (US)
44AQI (US)
22nd March 2026
44AQI (US)
44AQI (US)
23rd March 2026
32AQI (US)
32AQI (US)
24th March 2026
33AQI (US)
33AQI (US)
25th March 2026
52AQI (US)
52AQI (US)
26th March 2026
57AQI (US)
57AQI (US)
27th March 2026
28AQI (US)
28AQI (US)
28th March 2026
18AQI (US)
18AQI (US)
29th March 2026
26AQI (US)
26AQI (US)
30th March 2026
46AQI (US)
46AQI (US)
31st March 2026
41AQI (US)
41AQI (US)
1st April 2026
26AQI (US)
26AQI (US)
2nd April 2026
22AQI (US)
22AQI (US)
3rd April 2026
24AQI (US)
24AQI (US)
4th April 2026
29AQI (US)
29AQI (US)
5th April 2026
28AQI (US)
28AQI (US)
6th April 2026
30AQI (US)
30AQI (US)
7th April 2026
26AQI (US)
26AQI (US)
8th April 2026
48AQI (US)
48AQI (US)
9th April 2026
43AQI (US)
43AQI (US)
10th April 2026
33AQI (US)
33AQI (US)
11th April 2026
28AQI (US)
28AQI (US)
12th April 2026
40AQI (US)
40AQI (US)
13th April 2026
32AQI (US)
32AQI (US)
14th April 2026
35AQI (US)
35AQI (US)
15th April 2026
30AQI (US)
30AQI (US)
16th April 2026
21AQI (US)
21AQI (US)
17th April 2026
18th April 2026
22AQI (US)
22AQI (US)
19th April 2026
20AQI (US)
20AQI (US)
20th April 2026
19AQI (US)
19AQI (US)
21st April 2026
26AQI (US)
26AQI (US)
22nd April 2026
23rd April 2026
46AQI (US)
46AQI (US)
24th April 2026
22AQI (US)
22AQI (US)
25th April 2026
19AQI (US)
19AQI (US)
26th April 2026
27AQI (US)
27AQI (US)
27th April 2026
24AQI (US)
24AQI (US)
28th April 2026
21AQI (US)
21AQI (US)
29th April 2026
19AQI (US)
19AQI (US)
30th April 2026
28AQI (US)
28AQI (US)
1st May 2026
20AQI (US)
20AQI (US)
2nd May 2026
21AQI (US)
21AQI (US)
3rd May 2026
28AQI (US)
28AQI (US)
4th May 2026
39AQI (US)
39AQI (US)
5th May 2026
33AQI (US)
33AQI (US)
6th May 2026
22AQI (US)
22AQI (US)
7th May 2026
26AQI (US)
26AQI (US)
8th May 2026
34AQI (US)
34AQI (US)
9th May 2026
10th May 2026
24AQI (US)
24AQI (US)
11th May 2026
24AQI (US)
24AQI (US)
12th May 2026
33AQI (US)
33AQI (US)
13th May 2026
47AQI (US)
47AQI (US)
14th May 2026
28AQI (US)
28AQI (US)
15th May 2026
45AQI (US)
45AQI (US)
16th May 2026
49AQI (US)
49AQI (US)
17th May 2026
54AQI (US)
54AQI (US)
18th May 2026
51AQI (US)
51AQI (US)
19th May 2026
48AQI (US)
48AQI (US)
20th May 2026
47AQI (US)
47AQI (US)
21st May 2026
40AQI (US)
40AQI (US)
22nd May 2026
40AQI (US)
40AQI (US)
23rd May 2026
48AQI (US)
48AQI (US)
24th May 2026
39AQI (US)
39AQI (US)
25th May 2026
38AQI (US)
38AQI (US)
26th May 2026
26AQI (US)
26AQI (US)
27th May 2026
18AQI (US)
18AQI (US)
28th May 2026
30AQI (US)
30AQI (US)
29th May 2026
31AQI (US)
31AQI (US)
30th May 2026
24AQI (US)
24AQI (US)
31st May 2026
21AQI (US)
21AQI (US)
1st June 2026
21AQI (US)
21AQI (US)
2nd June 2026
22AQI (US)
22AQI (US)
3rd June 2026
29AQI (US)
29AQI (US)
4th June 2026
39AQI (US)
39AQI (US)
5th June 2026
34AQI (US)
34AQI (US)
6th June 2026
21AQI (US)
21AQI (US)
7th June 2026
27AQI (US)
27AQI (US)
8th June 2026
20AQI (US)
20AQI (US)
9th June 2026
21AQI (US)
21AQI (US)
10th June 2026
27AQI (US)
27AQI (US)
11th June 2026
20AQI (US)
20AQI (US)
12th June 2026
15AQI (US)
15AQI (US)
13th June 2026
19AQI (US)
19AQI (US)
14th June 2026
16AQI (US)
16AQI (US)
15th June 2026
16AQI (US)
16AQI (US)
16th June 2026
19AQI (US)
19AQI (US)
17th June 2026
36AQI (US)
36AQI (US)
18th June 2026
21AQI (US)
21AQI (US)
19th June 2026
19AQI (US)
19AQI (US)
20th June 2026
19AQI (US)
19AQI (US)
21st June 2026
20AQI (US)
20AQI (US)
22nd June 2026
17AQI (US)
17AQI (US)
23rd June 2026
16AQI (US)
16AQI (US)
24th June 2026
25AQI (US)
25AQI (US)
25th June 2026
19AQI (US)
19AQI (US)
26th June 2026
16AQI (US)
16AQI (US)
27th June 2026
21AQI (US)
21AQI (US)
28th June 2026
30AQI (US)
30AQI (US)
29th June 2026
34AQI (US)
34AQI (US)
30th June 2026
59AQI (US)
59AQI (US)
1st July 2026
48AQI (US)
48AQI (US)
2nd July 2026
36AQI (US)
36AQI (US)
3rd July 2026
24AQI (US)
24AQI (US)
4th July 2026
25AQI (US)
25AQI (US)
5th July 2026
28AQI (US)
28AQI (US)
6th July 2026
22AQI (US)
22AQI (US)
7th July 2026
24AQI (US)
24AQI (US)
8th July 2026
32AQI (US)
32AQI (US)
9th July 2026
33AQI (US)
33AQI (US)
10th July 2026
27AQI (US)
27AQI (US)
11th July 2026
20AQI (US)
20AQI (US)
12th July 2026
18AQI (US)
18AQI (US)
13th July 2026
26AQI (US)
26AQI (US)
14th July 2026
28AQI (US)
28AQI (US)
15th July 2026
30AQI (US)
30AQI (US)
16th July 2026
25AQI (US)
25AQI (US)
17th July 2026
45AQI (US)
45AQI (US)
18th July 2026
51AQI (US)
51AQI (US)
19th July 2026
54AQI (US)
54AQI (US)
20th July 2026
123AQI (US)
123AQI (US)
21st July 2026
58AQI (US)
58AQI (US)
22nd July 2026
47AQI (US)
47AQI (US)
23rd July 2026
42AQI (US)
42AQI (US)
24th July 2026
40AQI (US)
40AQI (US)
25th July 2026
50AQI (US)
50AQI (US)
26th July 2026
54AQI (US)
54AQI (US)
27th July 2026
57AQI (US)
57AQI (US)
28th July 2026
56AQI (US)
56AQI (US)
29th July 2026
44AQI (US)
44AQI (US)
30th July 2026
43AQI (US)
43AQI (US)
31st July 2026
45AQI (US)
45AQI (US)
1st August 2026
41AQI (US)
41AQI (US)
2nd August 2026
45AQI (US)
45AQI (US)
3rd August 2026
48AQI (US)
48AQI (US)
4th August 2026
54AQI (US)
54AQI (US)
5th August 2026
52AQI (US)
52AQI (US)
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
33AQI (US)
39AQI (US)
36AQI (US)
28AQI (US)
34AQI (US)
24AQI (US)
40AQI (US)
48AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202634AQI (US)
27
4
26
2
27
4
28
28
2
29
1
24
6
1
3
2
192
21
1
Highest AQI (US) recorded in
August48AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202541AQI (US)
5
28
2
30
1
18
12
23
8
22
8
1
16
14
16
15
23
7
22
9
203
76
1
Highest AQI (US) recorded in
June47AQI (US)
Lowest AQI (US) recorded in
May29AQI (US)
Most & Least Polluted Years Over the Last 2 Years
Most Polluted Year Recorded
2025(Avg.)
41AQI (US)Least Polluted Year Recorded
2026(Avg.)
34AQI (US)Alton's annual 2026 AQI (US) (34) shows an average percentage change of -17.07% (improved AQI (US)) compared to previous years: 2025 (41).
