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
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
1st Aug 2025
112AQILowest AQI recorded on
5th Aug 2025
32AQISame Day Analysis (8th August ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 53 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 8th Aug - 9th Aug 2025
Alton, Illinois, United States
AQI
Day
Night
.
5 AM8th Aug 2025
8 PM
4 AM9th Aug 2025
Day time
Avg. Highest Time
11AM8th Aug
54AQI
Avg. Lowest Time
8PM8th Aug
52AQI
Night time
Avg. Highest Time
5AM8th Aug
53AQI
Avg. Lowest Time
4AM9th Aug
48AQI
In the last 24 hours,
Alton's AQI reached its highest point of 54 at 11 AM during the Day, while the lowest point, 48, was recorded at 4 AM during the Night between 8th Aug and 9th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Alton, Illinois, United States
JulAug
10th - 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 - 07th07th - 08th08th - 09th09th
Day
Night
10th Jul 2025345 AMAQI
10th Jul 2025366 AMAQI
10th Jul 2025367 AMAQI
10th Jul 2025378 AMAQI
10th Jul 2025389 AMAQI
10th Jul 20254010 AMAQI
10th Jul 20254111 AMAQI
10th Jul 20254212 PMAQI
10th Jul 2025411 PMAQI
10th Jul 2025402 PMAQI
10th Jul 2025433 PMAQI
10th Jul 2025424 PMAQI
10th Jul 2025425 PMAQI
10th Jul 2025426 PMAQI
10th Jul 2025387 PMAQI
10th Jul 2025398 PMAQI
10th Jul 2025419 PMAQI
10th Jul 20254110 PMAQI
10th Jul 20254211 PMAQI
11th Jul 20254412 AMAQI
11th Jul 2025461 AMAQI
11th Jul 2025452 AMAQI
11th Jul 2025453 AMAQI
11th Jul 2025474 AMAQI
28°C20/35°C
11th Jul 2025485 AMAQI
11th Jul 2025496 AMAQI
11th Jul 2025517 AMAQI
11th Jul 2025528 AMAQI
11th Jul 2025529 AMAQI
11th Jul 20255010 AMAQI
11th Jul 20254811 AMAQI
11th Jul 20255112 PMAQI
11th Jul 2025521 PMAQI
11th Jul 2025502 PMAQI
11th Jul 2025503 PMAQI
11th Jul 2025504 PMAQI
11th Jul 2025485 PMAQI
11th Jul 2025476 PMAQI
11th Jul 2025507 PMAQI
11th Jul 2025488 PMAQI
11th Jul 2025479 PMAQI
11th Jul 20254610 PMAQI
11th Jul 20254611 PMAQI
12th Jul 20254812 AMAQI
12th Jul 2025441 AMAQI
12th Jul 2025342 AMAQI
12th Jul 2025313 AMAQI
12th Jul 2025294 AMAQI
29°C21/37°C
12th Jul 2025265 AMAQI
12th Jul 2025266 AMAQI
12th Jul 2025267 AMAQI
12th Jul 2025268 AMAQI
12th Jul 2025279 AMAQI
12th Jul 20253010 AMAQI
12th Jul 20253211 AMAQI
12th Jul 20253212 PMAQI
12th Jul 2025341 PMAQI
12th Jul 2025342 PMAQI
12th Jul 2025353 PMAQI
12th Jul 2025344 PMAQI
12th Jul 2025325 PMAQI
12th Jul 2025306 PMAQI
12th Jul 2025337 PMAQI
12th Jul 2025318 PMAQI
12th Jul 2025319 PMAQI
12th Jul 20253010 PMAQI
12th Jul 20253411 PMAQI
13th Jul 20253612 AMAQI
13th Jul 2025381 AMAQI
13th Jul 2025392 AMAQI
13th Jul 2025383 AMAQI
13th Jul 2025424 AMAQI
26°C23/32°C
13th Jul 2025385 AMAQI
13th Jul 2025406 AMAQI
13th Jul 2025377 AMAQI
13th Jul 2025388 AMAQI
13th Jul 2025399 AMAQI
13th Jul 20253810 AMAQI
13th Jul 20253711 AMAQI
13th Jul 20253812 PMAQI
13th Jul 2025381 PMAQI
13th Jul 2025362 PMAQI
13th Jul 2025343 PMAQI
13th Jul 2025334 PMAQI
13th Jul 2025315 PMAQI
13th Jul 2025326 PMAQI
13th Jul 2025367 PMAQI
13th Jul 2025378 PMAQI
13th Jul 2025329 PMAQI
13th Jul 20253310 PMAQI
13th Jul 20253511 PMAQI
14th Jul 20253412 AMAQI
14th Jul 2025311 AMAQI
14th Jul 2025242 AMAQI
14th Jul 2025243 AMAQI
14th Jul 2025274 AMAQI
24°C21/29°C
14th Jul 2025265 AMAQI
14th Jul 2025316 AMAQI
14th Jul 2025347 AMAQI
14th Jul 2025348 AMAQI
14th Jul 2025369 AMAQI
14th Jul 20254010 AMAQI
14th Jul 20253811 AMAQI
14th Jul 20253812 PMAQI
14th Jul 2025361 PMAQI
14th Jul 2025352 PMAQI
14th Jul 2025383 PMAQI
14th Jul 2025344 PMAQI
14th Jul 2025345 PMAQI
14th Jul 2025346 PMAQI
14th Jul 2025337 PMAQI
14th Jul 2025328 PMAQI
14th Jul 2025349 PMAQI
14th Jul 20253710 PMAQI
14th Jul 20253811 PMAQI
15th Jul 20253812 AMAQI
15th Jul 2025391 AMAQI
15th Jul 2025382 AMAQI
15th Jul 2025443 AMAQI
15th Jul 2025404 AMAQI
25°C22/31°C
15th Jul 2025395 AMAQI
15th Jul 2025406 AMAQI
15th Jul 2025387 AMAQI
15th Jul 2025448 AMAQI
15th Jul 2025469 AMAQI
15th Jul 20254010 AMAQI
15th Jul 20254011 AMAQI
15th Jul 20254112 PMAQI
15th Jul 2025421 PMAQI
15th Jul 2025412 PMAQI
15th Jul 2025423 PMAQI
15th Jul 2025424 PMAQI
15th Jul 2025395 PMAQI
15th Jul 2025386 PMAQI
15th Jul 2025387 PMAQI
15th Jul 2025378 PMAQI
15th Jul 2025349 PMAQI
15th Jul 20253310 PMAQI
15th Jul 20253211 PMAQI
16th Jul 20253812 AMAQI
16th Jul 2025391 AMAQI
16th Jul 2025372 AMAQI
16th Jul 2025403 AMAQI
16th Jul 2025404 AMAQI
26°C22/33°C
16th Jul 2025395 AMAQI
16th Jul 2025386 AMAQI
16th Jul 2025387 AMAQI
16th Jul 2025378 AMAQI
16th Jul 2025369 AMAQI
16th Jul 20253610 AMAQI
16th Jul 20253711 AMAQI
16th Jul 20253812 PMAQI
16th Jul 2025431 PMAQI
16th Jul 2025422 PMAQI
16th Jul 2025443 PMAQI
16th Jul 2025434 PMAQI
16th Jul 2025425 PMAQI
16th Jul 2025376 PMAQI
16th Jul 2025397 PMAQI
16th Jul 2025368 PMAQI
16th Jul 2025299 PMAQI
16th Jul 20252810 PMAQI
16th Jul 20252911 PMAQI
17th Jul 20253012 AMAQI
17th Jul 2025301 AMAQI
17th Jul 2025312 AMAQI
17th Jul 2025323 AMAQI
17th Jul 2025304 AMAQI
28°C22/36°C
17th Jul 2025275 AMAQI
17th Jul 2025266 AMAQI
17th Jul 2025277 AMAQI
17th Jul 2025278 AMAQI
17th Jul 2025279 AMAQI
17th Jul 20252810 AMAQI
17th Jul 20252811 AMAQI
17th Jul 20252812 PMAQI
17th Jul 2025301 PMAQI
17th Jul 2025312 PMAQI
17th Jul 2025323 PMAQI
17th Jul 2025304 PMAQI
17th Jul 2025305 PMAQI
17th Jul 2025286 PMAQI
17th Jul 2025297 PMAQI
17th Jul 2025288 PMAQI
17th Jul 2025279 PMAQI
17th Jul 20252610 PMAQI
17th Jul 20252711 PMAQI
18th Jul 20252712 AMAQI
18th Jul 2025261 AMAQI
18th Jul 2025262 AMAQI
18th Jul 2025253 AMAQI
18th Jul 2025234 AMAQI
26°C23/31°C
18th Jul 2025225 AMAQI
18th Jul 2025236 AMAQI
18th Jul 2025247 AMAQI
18th Jul 2025258 AMAQI
18th Jul 2025289 AMAQI
18th Jul 20253110 AMAQI
18th Jul 20253311 AMAQI
18th Jul 20253212 PMAQI
18th Jul 2025351 PMAQI
18th Jul 2025342 PMAQI
18th Jul 2025353 PMAQI
18th Jul 2025364 PMAQI
18th Jul 2025375 PMAQI
18th Jul 2025366 PMAQI
18th Jul 2025297 PMAQI
18th Jul 2025308 PMAQI
18th Jul 2025409 PMAQI
18th Jul 20254010 PMAQI
18th Jul 20254311 PMAQI
19th Jul 20254912 AMAQI
19th Jul 2025511 AMAQI
19th Jul 2025542 AMAQI
19th Jul 2025543 AMAQI
19th Jul 2025504 AMAQI
26°C22/32°C
19th Jul 2025525 AMAQI
19th Jul 2025526 AMAQI
19th Jul 2025507 AMAQI
19th Jul 2025478 AMAQI
19th Jul 2025449 AMAQI
19th Jul 20254510 AMAQI
19th Jul 20254911 AMAQI
19th Jul 20255212 PMAQI
19th Jul 2025531 PMAQI
19th Jul 2025522 PMAQI
19th Jul 2025463 PMAQI
19th Jul 2025384 PMAQI
19th Jul 2025355 PMAQI
19th Jul 2025386 PMAQI
19th Jul 2025457 PMAQI
19th Jul 2025498 PMAQI
19th Jul 2025499 PMAQI
19th Jul 20254810 PMAQI
19th Jul 20255011 PMAQI
20th Jul 20255112 AMAQI
20th Jul 2025531 AMAQI
20th Jul 2025552 AMAQI
20th Jul 2025553 AMAQI
20th Jul 2025544 AMAQI
27°C24/33°C
20th Jul 2025535 AMAQI
20th Jul 2025546 AMAQI
20th Jul 2025557 AMAQI
20th Jul 2025548 AMAQI
20th Jul 2025539 AMAQI
20th Jul 20255410 AMAQI
20th Jul 20255211 AMAQI
20th Jul 20255412 PMAQI
20th Jul 2025521 PMAQI
20th Jul 2025522 PMAQI
20th Jul 2025523 PMAQI
20th Jul 2025534 PMAQI
20th Jul 2025545 PMAQI
20th Jul 2025546 PMAQI
20th Jul 2025537 PMAQI
20th Jul 2025538 PMAQI
20th Jul 2025529 PMAQI
20th Jul 20255110 PMAQI
20th Jul 20255211 PMAQI
21st Jul 20254912 AMAQI
21st Jul 2025461 AMAQI
21st Jul 2025352 AMAQI
21st Jul 2025303 AMAQI
21st Jul 2025264 AMAQI
30°C25/37°C
21st Jul 2025235 AMAQI
21st Jul 2025216 AMAQI
21st Jul 2025237 AMAQI
21st Jul 2025228 AMAQI
21st Jul 2025209 AMAQI
21st Jul 20252210 AMAQI
21st Jul 20252411 AMAQI
21st Jul 20252312 PMAQI
21st Jul 2025221 PMAQI
21st Jul 2025262 PMAQI
21st Jul 2025273 PMAQI
21st Jul 2025284 PMAQI
21st Jul 2025285 PMAQI
21st Jul 2025286 PMAQI
21st Jul 2025277 PMAQI
21st Jul 2025308 PMAQI
21st Jul 2025369 PMAQI
21st Jul 20253610 PMAQI
21st Jul 20253711 PMAQI
22nd Jul 20253812 AMAQI
22nd Jul 2025401 AMAQI
22nd Jul 2025392 AMAQI
22nd Jul 2025403 AMAQI
22nd Jul 2025364 AMAQI
25°C23/29°C
22nd Jul 2025375 AMAQI
22nd Jul 2025416 AMAQI
22nd Jul 2025427 AMAQI
22nd Jul 2025418 AMAQI
22nd Jul 2025449 AMAQI
22nd Jul 20254210 AMAQI
22nd Jul 20254211 AMAQI
22nd Jul 20254512 PMAQI
22nd Jul 2025441 PMAQI
22nd Jul 2025482 PMAQI
22nd Jul 2025513 PMAQI
22nd Jul 2025524 PMAQI
22nd Jul 2025525 PMAQI
22nd Jul 2025516 PMAQI
22nd Jul 2025427 PMAQI
22nd Jul 2025428 PMAQI
22nd Jul 2025389 PMAQI
22nd Jul 20253810 PMAQI
22nd Jul 20254111 PMAQI
23rd Jul 20254412 AMAQI
23rd Jul 2025461 AMAQI
23rd Jul 2025462 AMAQI
23rd Jul 2025503 AMAQI
23rd Jul 2025524 AMAQI
28°C22/35°C
23rd Jul 2025545 AMAQI
23rd Jul 2025536 AMAQI
23rd Jul 2025537 AMAQI
23rd Jul 2025538 AMAQI
23rd Jul 2025569 AMAQI
23rd Jul 20255810 AMAQI
23rd Jul 20256011 AMAQI
23rd Jul 20256012 PMAQI
23rd Jul 2025611 PMAQI
23rd Jul 2025602 PMAQI
23rd Jul 2025583 PMAQI
23rd Jul 2025604 PMAQI
23rd Jul 2025605 PMAQI
23rd Jul 2025586 PMAQI
23rd Jul 2025567 PMAQI
23rd Jul 2025568 PMAQI
23rd Jul 2025599 PMAQI
23rd Jul 20255910 PMAQI
23rd Jul 20255811 PMAQI
24th Jul 20255712 AMAQI
24th Jul 2025571 AMAQI
24th Jul 2025572 AMAQI
24th Jul 2025583 AMAQI
24th Jul 2025584 AMAQI
30°C25/37°C
24th Jul 2025585 AMAQI
24th Jul 2025586 AMAQI
24th Jul 2025597 AMAQI
24th Jul 2025588 AMAQI
24th Jul 2025589 AMAQI
24th Jul 20255710 AMAQI
24th Jul 20255711 AMAQI
24th Jul 20255712 PMAQI
24th Jul 2025581 PMAQI
24th Jul 2025562 PMAQI
24th Jul 2025573 PMAQI
24th Jul 2025564 PMAQI
24th Jul 2025565 PMAQI
24th Jul 2025566 PMAQI
24th Jul 2025587 PMAQI
24th Jul 2025578 PMAQI
24th Jul 2025579 PMAQI
24th Jul 20255710 PMAQI
24th Jul 20255711 PMAQI
25th Jul 20255612 AMAQI
25th Jul 2025531 AMAQI
25th Jul 2025382 AMAQI
25th Jul 2025303 AMAQI
25th Jul 2025304 AMAQI
30°C24/37°C
25th Jul 2025265 AMAQI
25th Jul 2025226 AMAQI
25th Jul 2025217 AMAQI
25th Jul 2025218 AMAQI
25th Jul 2025229 AMAQI
25th Jul 20252310 AMAQI
25th Jul 20252811 AMAQI
25th Jul 20253212 PMAQI
25th Jul 2025401 PMAQI
25th Jul 2025502 PMAQI
25th Jul 2025543 PMAQI
25th Jul 2025564 PMAQI
25th Jul 2025545 PMAQI
25th Jul 2025536 PMAQI
25th Jul 2025467 PMAQI
25th Jul 2025488 PMAQI
25th Jul 2025529 PMAQI
25th Jul 20255210 PMAQI
25th Jul 20255211 PMAQI
26th Jul 20255212 AMAQI
26th Jul 2025521 AMAQI
26th Jul 2025512 AMAQI
26th Jul 2025523 AMAQI
26th Jul 2025514 AMAQI
29°C23/35°C
26th Jul 2025505 AMAQI
26th Jul 2025496 AMAQI
26th Jul 2025487 AMAQI
26th Jul 2025488 AMAQI
26th Jul 2025499 AMAQI
26th Jul 20254810 AMAQI
26th Jul 20254611 AMAQI
26th Jul 20254312 PMAQI
26th Jul 2025401 PMAQI
26th Jul 2025392 PMAQI
26th Jul 2025433 PMAQI
26th Jul 2025404 PMAQI
26th Jul 2025385 PMAQI
26th Jul 2025386 PMAQI
26th Jul 2025437 PMAQI
26th Jul 2025458 PMAQI
26th Jul 2025389 PMAQI
26th Jul 20253710 PMAQI
26th Jul 20253611 PMAQI
27th Jul 20253612 AMAQI
27th Jul 2025331 AMAQI
27th Jul 2025252 AMAQI
27th Jul 2025213 AMAQI
27th Jul 2025184 AMAQI
30°C25/37°C
27th Jul 2025165 AMAQI
27th Jul 2025176 AMAQI
27th Jul 2025187 AMAQI
27th Jul 2025188 AMAQI
27th Jul 2025189 AMAQI
27th Jul 20251910 AMAQI
27th Jul 20252111 AMAQI
27th Jul 20252312 PMAQI
27th Jul 2025261 PMAQI
27th Jul 2025282 PMAQI
27th Jul 2025303 PMAQI
27th Jul 2025334 PMAQI
27th Jul 2025375 PMAQI
27th Jul 2025406 PMAQI
27th Jul 2025307 PMAQI
27th Jul 2025318 PMAQI
27th Jul 2025389 PMAQI
27th Jul 20253710 PMAQI
27th Jul 20253411 PMAQI
28th Jul 20253412 AMAQI
28th Jul 2025341 AMAQI
28th Jul 2025332 AMAQI
28th Jul 2025323 AMAQI
28th Jul 2025304 AMAQI
29°C25/34°C
28th Jul 2025325 AMAQI
28th Jul 2025336 AMAQI
28th Jul 2025337 AMAQI
28th Jul 2025348 AMAQI
28th Jul 2025359 AMAQI
28th Jul 20253810 AMAQI
28th Jul 20253811 AMAQI
28th Jul 20253812 PMAQI
28th Jul 2025391 PMAQI
28th Jul 2025412 PMAQI
28th Jul 2025413 PMAQI
28th Jul 2025414 PMAQI
28th Jul 2025415 PMAQI
28th Jul 2025436 PMAQI
28th Jul 2025387 PMAQI
28th Jul 2025398 PMAQI
28th Jul 2025429 PMAQI
28th Jul 20254210 PMAQI
28th Jul 20254411 PMAQI
29th Jul 20254412 AMAQI
29th Jul 2025451 AMAQI
29th Jul 2025422 AMAQI
29th Jul 2025423 AMAQI
29th Jul 2025434 AMAQI
30°C26/35°C
29th Jul 2025435 AMAQI
29th Jul 2025436 AMAQI
29th Jul 2025437 AMAQI
29th Jul 2025438 AMAQI
29th Jul 2025409 AMAQI
29th Jul 20254010 AMAQI
29th Jul 20253511 AMAQI
29th Jul 20253612 PMAQI
29th Jul 2025351 PMAQI
29th Jul 2025382 PMAQI
29th Jul 2025403 PMAQI
29th Jul 2025404 PMAQI
29th Jul 2025415 PMAQI
29th Jul 2025416 PMAQI
29th Jul 2025437 PMAQI
29th Jul 2025428 PMAQI
29th Jul 2025399 PMAQI
29th Jul 20253810 PMAQI
29th Jul 20253811 PMAQI
30th Jul 20253912 AMAQI
30th Jul 2025391 AMAQI
30th Jul 2025382 AMAQI
30th Jul 2025383 AMAQI
30th Jul 2025374 AMAQI
30°C25/37°C
30th Jul 2025365 AMAQI
30th Jul 2025366 AMAQI
30th Jul 2025387 AMAQI
30th Jul 2025408 AMAQI
30th Jul 2025469 AMAQI
30th Jul 20254610 AMAQI
30th Jul 20255011 AMAQI
30th Jul 20255112 PMAQI
30th Jul 2025481 PMAQI
30th Jul 2025412 PMAQI
30th Jul 2025413 PMAQI
30th Jul 2025414 PMAQI
30th Jul 2025415 PMAQI
30th Jul 2025416 PMAQI
30th Jul 2025417 PMAQI
30th Jul 2025418 PMAQI
30th Jul 2025349 PMAQI
30th Jul 20253210 PMAQI
30th Jul 20253411 PMAQI
31st Jul 20253012 AMAQI
31st Jul 2025301 AMAQI
31st Jul 2025262 AMAQI
31st Jul 2025263 AMAQI
31st Jul 2025254 AMAQI
28°C21/34°C
31st Jul 2025235 AMAQI
31st Jul 2025256 AMAQI
31st Jul 2025327 AMAQI
31st Jul 2025288 AMAQI
31st Jul 2025289 AMAQI
31st Jul 20253210 AMAQI
31st Jul 20253411 AMAQI
31st Jul 20253212 PMAQI
31st Jul 2025311 PMAQI
31st Jul 2025382 PMAQI
31st Jul 2025513 PMAQI
31st Jul 2025534 PMAQI
31st Jul 2025535 PMAQI
31st Jul 2025536 PMAQI
31st Jul 2025287 PMAQI
31st Jul 2025478 PMAQI
31st Jul 2025749 PMAQI
31st Jul 20258810 PMAQI
31st Jul 202510511 PMAQI
1st Aug 202510412 AMAQI
1st Aug 20251161 AMAQI
1st Aug 20251142 AMAQI
1st Aug 20251023 AMAQI
1st Aug 20251184 AMAQI
24°C21/25°C
1st Aug 20251375 AMAQI
1st Aug 20251466 AMAQI
1st Aug 20251407 AMAQI
1st Aug 20251388 AMAQI
1st Aug 20251289 AMAQI
1st Aug 202512810 AMAQI
1st Aug 202512611 AMAQI
1st Aug 202510912 PMAQI
1st Aug 20251061 PMAQI
1st Aug 20251022 PMAQI
1st Aug 2025983 PMAQI
1st Aug 2025974 PMAQI
1st Aug 2025965 PMAQI
1st Aug 20251006 PMAQI
1st Aug 20251187 PMAQI
1st Aug 20251118 PMAQI
1st Aug 2025979 PMAQI
1st Aug 20259510 PMAQI
1st Aug 20259211 PMAQI
2nd Aug 20259512 AMAQI
2nd Aug 2025951 AMAQI
2nd Aug 20251002 AMAQI
2nd Aug 2025963 AMAQI
2nd Aug 2025984 AMAQI
22°C15/29°C
2nd Aug 2025945 AMAQI
2nd Aug 2025976 AMAQI
2nd Aug 2025987 AMAQI
2nd Aug 2025988 AMAQI
2nd Aug 2025989 AMAQI
2nd Aug 20259510 AMAQI
2nd Aug 20259011 AMAQI
2nd Aug 20257812 PMAQI
2nd Aug 2025691 PMAQI
2nd Aug 2025642 PMAQI
2nd Aug 2025593 PMAQI
2nd Aug 2025564 PMAQI
2nd Aug 2025555 PMAQI
2nd Aug 2025536 PMAQI
2nd Aug 2025847 PMAQI
2nd Aug 2025738 PMAQI
2nd Aug 2025549 PMAQI
2nd Aug 20255310 PMAQI
2nd Aug 20255311 PMAQI
3rd Aug 20255212 AMAQI
3rd Aug 2025501 AMAQI
3rd Aug 2025512 AMAQI
3rd Aug 2025523 AMAQI
3rd Aug 2025504 AMAQI
21°C15/27°C
3rd Aug 2025475 AMAQI
3rd Aug 2025486 AMAQI
3rd Aug 2025477 AMAQI
3rd Aug 2025478 AMAQI
3rd Aug 2025479 AMAQI
3rd Aug 20254610 AMAQI
3rd Aug 20254311 AMAQI
3rd Aug 20254112 PMAQI
3rd Aug 2025401 PMAQI
3rd Aug 2025422 PMAQI
3rd Aug 2025443 PMAQI
3rd Aug 2025414 PMAQI
3rd Aug 2025415 PMAQI
3rd Aug 2025406 PMAQI
3rd Aug 2025467 PMAQI
3rd Aug 2025418 PMAQI
3rd Aug 2025369 PMAQI
3rd Aug 20253810 PMAQI
3rd Aug 20253911 PMAQI
4th Aug 20254112 AMAQI
4th Aug 2025401 AMAQI
4th Aug 2025362 AMAQI
4th Aug 2025383 AMAQI
4th Aug 2025374 AMAQI
21°C15/26°C
4th Aug 2025365 AMAQI
4th Aug 2025366 AMAQI
4th Aug 2025367 AMAQI
4th Aug 2025388 AMAQI
4th Aug 2025399 AMAQI
4th Aug 20253910 AMAQI
4th Aug 20253811 AMAQI
4th Aug 20253912 PMAQI
4th Aug 2025411 PMAQI
4th Aug 2025422 PMAQI
4th Aug 2025413 PMAQI
4th Aug 2025404 PMAQI
4th Aug 2025395 PMAQI
4th Aug 2025386 PMAQI
4th Aug 2025397 PMAQI
4th Aug 2025348 PMAQI
4th Aug 2025329 PMAQI
4th Aug 20253310 PMAQI
4th Aug 20252911 PMAQI
5th Aug 20252812 AMAQI
5th Aug 2025251 AMAQI
5th Aug 2025252 AMAQI
5th Aug 2025253 AMAQI
5th Aug 2025254 AMAQI
23°C17/28°C
5th Aug 2025245 AMAQI
5th Aug 2025256 AMAQI
5th Aug 2025267 AMAQI
5th Aug 2025288 AMAQI
5th Aug 2025319 AMAQI
5th Aug 20253510 AMAQI
5th Aug 20253811 AMAQI
5th Aug 20253912 PMAQI
5th Aug 2025401 PMAQI
5th Aug 2025422 PMAQI
5th Aug 2025413 PMAQI
5th Aug 2025404 PMAQI
5th Aug 2025395 PMAQI
5th Aug 2025386 PMAQI
5th Aug 2025327 PMAQI
5th Aug 2025358 PMAQI
5th Aug 2025339 PMAQI
5th Aug 20253210 PMAQI
5th Aug 20253211 PMAQI
6th Aug 20253412 AMAQI
6th Aug 2025361 AMAQI
6th Aug 2025342 AMAQI
6th Aug 2025353 AMAQI
6th Aug 2025374 AMAQI
24°C19/31°C
6th Aug 2025375 AMAQI
6th Aug 2025366 AMAQI
6th Aug 2025357 AMAQI
6th Aug 2025388 AMAQI
6th Aug 2025409 AMAQI
6th Aug 20254710 AMAQI
6th Aug 20255411 AMAQI
6th Aug 20255612 PMAQI
6th Aug 2025551 PMAQI
6th Aug 2025582 PMAQI
6th Aug 2025623 PMAQI
6th Aug 2025614 PMAQI
6th Aug 2025615 PMAQI
6th Aug 2025596 PMAQI
6th Aug 2025367 PMAQI
6th Aug 2025458 PMAQI
6th Aug 2025549 PMAQI
6th Aug 20255510 PMAQI
6th Aug 20255511 PMAQI
7th Aug 20255412 AMAQI
7th Aug 2025531 AMAQI
7th Aug 2025532 AMAQI
7th Aug 2025523 AMAQI
7th Aug 2025524 AMAQI
26°C17/34°C
7th Aug 2025515 AMAQI
7th Aug 2025526 AMAQI
7th Aug 2025527 AMAQI
7th Aug 2025528 AMAQI
7th Aug 2025539 AMAQI
7th Aug 20255310 AMAQI
7th Aug 20255411 AMAQI
7th Aug 20255212 PMAQI
7th Aug 2025541 PMAQI
7th Aug 2025552 PMAQI
7th Aug 2025553 PMAQI
7th Aug 2025544 PMAQI
7th Aug 2025555 PMAQI
7th Aug 2025546 PMAQI
7th Aug 2025547 PMAQI
7th Aug 2025538 PMAQI
7th Aug 2025559 PMAQI
7th Aug 20255410 PMAQI
7th Aug 20255411 PMAQI
8th Aug 20255412 AMAQI
8th Aug 2025541 AMAQI
8th Aug 2025532 AMAQI
8th Aug 2025523 AMAQI
8th Aug 2025524 AMAQI
27°C20/32°C
8th Aug 2025535 AMAQI
8th Aug 2025526 AMAQI
8th Aug 2025537 AMAQI
8th Aug 2025538 AMAQI
8th Aug 2025539 AMAQI
8th Aug 20255310 AMAQI
8th Aug 20255411 AMAQI
8th Aug 20255212 PMAQI
8th Aug 2025521 PMAQI
8th Aug 2025522 PMAQI
8th Aug 2025533 PMAQI
8th Aug 2025524 PMAQI
8th Aug 2025525 PMAQI
8th Aug 2025526 PMAQI
8th Aug 2025537 PMAQI
8th Aug 2025528 PMAQI
8th Aug 2025529 PMAQI
8th Aug 20255210 PMAQI
8th Aug 20255311 PMAQI
9th Aug 20255312 AMAQI
9th Aug 2025521 AMAQI
9th Aug 2025512 AMAQI
9th Aug 2025493 AMAQI
9th Aug 2025484 AMAQI
29°C23/36°C
9th Aug 2025465 AMAQI
5 AM9th Aug 2025476 AMAQI
9th Aug 2025477 AMAQI
9th Aug 2025468 AMAQI
9th Aug 2025489 AMAQI
12 PM
8 PM
12 AM
4 AM
--°C/°C
Day time
Avg. Highest Time
5 AM - 8 PM
45AQI
16 hours / Day
480 hours / Month
Avg. Lowest Time
5 AM - 8 PM
45AQI
16 hours / Day
480 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 8 PM (Avg. 45), while the lowest AQI was between 5 AM to 8 PM (Avg. 45).
Night time
Avg. Highest Time
12 AM - 11 PM
45AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
45AQI
8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 45), while the lowest AQI was between 12 AM to 11 PM (Avg. 45).
2025 Days Vs Air Quality
Alton, Illinois, United States
2025
80%
108
19%
26
0.7%
1
Total number of days with different AQI categories in last 221 days in 2025 (144 days remaining)
Good
108 DaysModerate
26 DaysPoor
1 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 80%
Health Risk Level:
Low
In 2025, 80% of 221 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Alton, Illinois, United States
AQI levels in 2025
AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
1st March 2025
50AQI
50AQI
2nd March 2025
38AQI
38AQI
3rd March 2025
41AQI
41AQI
4th March 2025
26AQI
26AQI
5th March 2025
18AQI
18AQI
1st April 2025
32AQI
32AQI
2nd April 2025
37AQI
37AQI
3rd April 2025
27AQI
27AQI
4th April 2025
27AQI
27AQI
5th April 2025
24AQI
24AQI
6th April 2025
22AQI
22AQI
7th April 2025
30AQI
30AQI
8th April 2025
24AQI
24AQI
9th April 2025
28AQI
28AQI
10th April 2025
38AQI
38AQI
11th April 2025
40AQI
40AQI
12th April 2025
52AQI
52AQI
13th April 2025
44AQI
44AQI
14th April 2025
39AQI
39AQI
15th April 2025
22AQI
22AQI
16th April 2025
35AQI
35AQI
17th April 2025
50AQI
50AQI
18th April 2025
58AQI
58AQI
19th April 2025
48AQI
48AQI
20th April 2025
49AQI
49AQI
21st April 2025
22AQI
22AQI
22nd April 2025
34AQI
34AQI
23rd April 2025
35AQI
35AQI
24th April 2025
40AQI
40AQI
25th April 2025
37AQI
37AQI
26th April 2025
24AQI
24AQI
27th April 2025
25AQI
25AQI
28th April 2025
40AQI
40AQI
29th April 2025
35AQI
35AQI
30th April 2025
27AQI
27AQI
1st May 2025
28AQI
28AQI
2nd May 2025
26AQI
26AQI
3rd May 2025
26AQI
26AQI
4th May 2025
20AQI
20AQI
5th May 2025
19AQI
19AQI
6th May 2025
28AQI
28AQI
7th May 2025
29AQI
29AQI
8th May 2025
29AQI
29AQI
9th May 2025
26AQI
26AQI
10th May 2025
34AQI
34AQI
11th May 2025
36AQI
36AQI
12th May 2025
35AQI
35AQI
13th May 2025
33AQI
33AQI
14th May 2025
39AQI
39AQI
15th May 2025
55AQI
55AQI
16th May 2025
39AQI
39AQI
17th May 2025
24AQI
24AQI
18th May 2025
21AQI
21AQI
19th May 2025
29AQI
29AQI
20th May 2025
27AQI
27AQI
21st May 2025
15AQI
15AQI
22nd May 2025
13AQI
13AQI
23rd May 2025
17AQI
17AQI
24th May 2025
27AQI
27AQI
25th May 2025
33AQI
33AQI
26th May 2025
22AQI
22AQI
27th May 2025
22AQI
22AQI
28th May 2025
26AQI
26AQI
29th May 2025
39AQI
39AQI
30th May 2025
30AQI
30AQI
31st May 2025
44AQI
44AQI
1st June 2025
37AQI
37AQI
2nd June 2025
48AQI
48AQI
3rd June 2025
57AQI
57AQI
4th June 2025
48AQI
48AQI
5th June 2025
35AQI
35AQI
6th June 2025
49AQI
49AQI
7th June 2025
62AQI
62AQI
8th June 2025
57AQI
57AQI
9th June 2025
58AQI
58AQI
10th June 2025
60AQI
60AQI
11th June 2025
69AQI
69AQI
12th June 2025
76AQI
76AQI
13th June 2025
51AQI
51AQI
14th June 2025
35AQI
35AQI
15th June 2025
44AQI
44AQI
16th June 2025
35AQI
35AQI
17th June 2025
37AQI
37AQI
18th June 2025
36AQI
36AQI
19th June 2025
26AQI
26AQI
20th June 2025
42AQI
42AQI
21st June 2025
50AQI
50AQI
22nd June 2025
52AQI
52AQI
23rd June 2025
58AQI
58AQI
24th June 2025
54AQI
54AQI
25th June 2025
53AQI
53AQI
26th June 2025
50AQI
50AQI
27th June 2025
33AQI
33AQI
28th June 2025
28AQI
28AQI
29th June 2025
28AQI
28AQI
30th June 2025
30AQI
30AQI
1st July 2025
29AQI
29AQI
2nd July 2025
43AQI
43AQI
3rd July 2025
51AQI
51AQI
4th July 2025
59AQI
59AQI
5th July 2025
82AQI
82AQI
6th July 2025
58AQI
58AQI
7th July 2025
38AQI
38AQI
8th July 2025
53AQI
53AQI
9th July 2025
36AQI
36AQI
10th July 2025
39AQI
39AQI
11th July 2025
48AQI
48AQI
12th July 2025
32AQI
32AQI
13th July 2025
37AQI
37AQI
14th July 2025
33AQI
33AQI
15th July 2025
39AQI
39AQI
16th July 2025
37AQI
37AQI
17th July 2025
29AQI
29AQI
18th July 2025
31AQI
31AQI
19th July 2025
48AQI
48AQI
20th July 2025
53AQI
53AQI
21st July 2025
30AQI
30AQI
22nd July 2025
42AQI
42AQI
23rd July 2025
55AQI
55AQI
24th July 2025
57AQI
57AQI
25th July 2025
41AQI
41AQI
26th July 2025
45AQI
45AQI
27th July 2025
27AQI
27AQI
28th July 2025
37AQI
37AQI
29th July 2025
41AQI
41AQI
30th July 2025
40AQI
40AQI
31st July 2025
42AQI
42AQI
1st August 2025
112AQI
112AQI
2nd August 2025
80AQI
80AQI
3rd August 2025
45AQI
45AQI
4th August 2025
37AQI
37AQI
5th August 2025
32AQI
32AQI
6th August 2025
46AQI
46AQI
7th August 2025
53AQI
53AQI
8th August 2025
53AQI
53AQI
35AQI
35AQI
29AQI
47AQI
43AQI
57AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202539AQI
5
28
2
30
1
18
12
23
8
4
3
1
108
26
1
Highest AQI recorded in
August57AQI
Lowest AQI recorded in
May29AQI
Most & Least Polluted Years Over the Last 1 Years
Most Polluted Year Recorded
2025(Avg.)
39AQILeast Polluted Year Recorded
2025(Avg.)
39AQIAlton's annual 2025 AQI (39) shows an average percentage change of NaN% (improved AQI) compared to previous years: .
