Chester, 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+
November Air Quality Analysis
Chester, Illinois, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
10th Nov 2021
66AQILowest AQI recorded on
6th Nov 2024
14AQISame Day Analysis (1st November ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 20 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 1st Nov - 2nd Nov 2025
Chester, Illinois, United States
AQI
Day
Night
.
7 AM1st Nov 2025
6 PM
6 AM2nd Nov 2025
Day time
Avg. Highest Time
1PM1st Nov
36AQI
Avg. Lowest Time
4PM1st Nov
25AQI
Night time
Avg. Highest Time
3AM2nd Nov
53AQI
Avg. Lowest Time
8PM1st Nov
18AQI
In the last 24 hours,
Chester's AQI reached its highest point of 53 at 3 AM during the Night, while the lowest point, 18, was recorded at 8 PM during the Night between 1st Nov and 2nd Nov 2025.
Day & Night AQI Trend : Oct - Nov 2025
Chester, Illinois, United States
OctNov
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 - 02nd02nd
Day
Night
3rd Oct 2025297 AMAQI
3rd Oct 2025318 AMAQI
3rd Oct 2025259 AMAQI
3rd Oct 20253810 AMAQI
3rd Oct 20254011 AMAQI
3rd Oct 20254512 PMAQI
3rd Oct 2025481 PMAQI
3rd Oct 2025372 PMAQI
3rd Oct 2025303 PMAQI
3rd Oct 2025304 PMAQI
3rd Oct 2025285 PMAQI
3rd Oct 2025266 PMAQI
3rd Oct 2025287 PMAQI
3rd Oct 2025278 PMAQI
3rd Oct 2025269 PMAQI
3rd Oct 20252910 PMAQI
3rd Oct 20252911 PMAQI
4th Oct 20253412 AMAQI
4th Oct 2025431 AMAQI
4th Oct 2025442 AMAQI
4th Oct 2025523 AMAQI
4th Oct 2025514 AMAQI
4th Oct 2025455 AMAQI
4th Oct 2025406 AMAQI
25°C18/33°C
4th Oct 2025447 AMAQI
4th Oct 2025498 AMAQI
4th Oct 2025479 AMAQI
4th Oct 20254710 AMAQI
4th Oct 20254811 AMAQI
4th Oct 20255112 PMAQI
4th Oct 2025501 PMAQI
4th Oct 2025482 PMAQI
4th Oct 2025453 PMAQI
4th Oct 2025444 PMAQI
4th Oct 2025415 PMAQI
4th Oct 2025396 PMAQI
4th Oct 2025377 PMAQI
4th Oct 2025418 PMAQI
4th Oct 2025479 PMAQI
4th Oct 20255010 PMAQI
4th Oct 20254111 PMAQI
5th Oct 20254712 AMAQI
5th Oct 2025451 AMAQI
5th Oct 2025482 AMAQI
5th Oct 2025513 AMAQI
5th Oct 2025544 AMAQI
5th Oct 2025575 AMAQI
5th Oct 2025556 AMAQI
23°C16/31°C
5th Oct 2025557 AMAQI
5th Oct 2025488 AMAQI
5th Oct 2025549 AMAQI
5th Oct 20255610 AMAQI
5th Oct 20255311 AMAQI
5th Oct 20254912 PMAQI
5th Oct 2025501 PMAQI
5th Oct 2025522 PMAQI
5th Oct 2025413 PMAQI
5th Oct 2025394 PMAQI
5th Oct 2025375 PMAQI
5th Oct 2025386 PMAQI
5th Oct 2025307 PMAQI
5th Oct 2025378 PMAQI
5th Oct 2025319 PMAQI
5th Oct 20253610 PMAQI
5th Oct 20254411 PMAQI
6th Oct 20254612 AMAQI
6th Oct 2025381 AMAQI
6th Oct 2025432 AMAQI
6th Oct 2025463 AMAQI
6th Oct 2025484 AMAQI
6th Oct 2025475 AMAQI
6th Oct 2025436 AMAQI
22°C14/31°C
6th Oct 2025477 AMAQI
6th Oct 2025458 AMAQI
6th Oct 2025449 AMAQI
6th Oct 20255010 AMAQI
6th Oct 20255411 AMAQI
6th Oct 20255712 PMAQI
6th Oct 2025561 PMAQI
7th Oct 2025134 AMAQI
7th Oct 202575 AMAQI
7th Oct 2025506 AMAQI
22°C18/28°C
7th Oct 2025457 AMAQI
7th Oct 2025348 AMAQI
7th Oct 2025339 AMAQI
7th Oct 20252710 AMAQI
7th Oct 20252911 AMAQI
7th Oct 20253312 PMAQI
7th Oct 2025331 PMAQI
7th Oct 2025302 PMAQI
7th Oct 2025353 PMAQI
7th Oct 2025294 PMAQI
7th Oct 2025305 PMAQI
7th Oct 2025296 PMAQI
7th Oct 2025257 PMAQI
7th Oct 2025258 PMAQI
7th Oct 2025259 PMAQI
7th Oct 20252310 PMAQI
7th Oct 20252911 PMAQI
8th Oct 20252512 AMAQI
8th Oct 2025291 AMAQI
8th Oct 2025332 AMAQI
8th Oct 2025213 AMAQI
8th Oct 2025154 AMAQI
8th Oct 2025205 AMAQI
8th Oct 2025156 AMAQI
23°C18/31°C
8th Oct 2025147 AMAQI
8th Oct 2025248 AMAQI
8th Oct 2025259 AMAQI
8th Oct 20252310 AMAQI
8th Oct 20252711 AMAQI
8th Oct 20253412 PMAQI
8th Oct 2025321 PMAQI
8th Oct 2025222 PMAQI
8th Oct 2025203 PMAQI
8th Oct 2025244 PMAQI
8th Oct 2025245 PMAQI
8th Oct 2025316 PMAQI
8th Oct 2025317 PMAQI
8th Oct 2025378 PMAQI
8th Oct 2025309 PMAQI
8th Oct 20253110 PMAQI
8th Oct 20253611 PMAQI
9th Oct 20253212 AMAQI
9th Oct 2025281 AMAQI
9th Oct 2025312 AMAQI
9th Oct 2025373 AMAQI
9th Oct 2025324 AMAQI
9th Oct 2025355 AMAQI
9th Oct 2025296 AMAQI
18°C12/27°C
9th Oct 2025277 AMAQI
9th Oct 2025268 AMAQI
9th Oct 2025259 AMAQI
9th Oct 20253110 AMAQI
9th Oct 20253411 AMAQI
9th Oct 20253112 PMAQI
9th Oct 2025381 PMAQI
9th Oct 2025432 PMAQI
9th Oct 2025413 PMAQI
9th Oct 2025384 PMAQI
9th Oct 2025375 PMAQI
9th Oct 2025306 PMAQI
9th Oct 2025287 PMAQI
9th Oct 2025238 PMAQI
9th Oct 2025319 PMAQI
9th Oct 20253310 PMAQI
9th Oct 20253711 PMAQI
10th Oct 20253512 AMAQI
10th Oct 2025371 AMAQI
10th Oct 2025352 AMAQI
10th Oct 2025333 AMAQI
10th Oct 2025304 AMAQI
10th Oct 2025275 AMAQI
10th Oct 2025306 AMAQI
16°C8/26°C
10th Oct 2025267 AMAQI
10th Oct 2025268 AMAQI
10th Oct 2025269 AMAQI
10th Oct 20253210 AMAQI
10th Oct 20253811 AMAQI
10th Oct 20254012 PMAQI
10th Oct 2025411 PMAQI
10th Oct 2025382 PMAQI
10th Oct 2025373 PMAQI
10th Oct 2025324 PMAQI
10th Oct 2025245 PMAQI
10th Oct 2025266 PMAQI
10th Oct 2025347 PMAQI
10th Oct 2025348 PMAQI
10th Oct 2025389 PMAQI
10th Oct 20253810 PMAQI
10th Oct 20253611 PMAQI
11th Oct 20253812 AMAQI
11th Oct 2025391 AMAQI
11th Oct 2025282 AMAQI
11th Oct 2025363 AMAQI
11th Oct 2025354 AMAQI
11th Oct 2025365 AMAQI
11th Oct 2025296 AMAQI
16°C7/26°C
11th Oct 2025307 AMAQI
11th Oct 2025318 AMAQI
11th Oct 2025319 AMAQI
11th Oct 20253010 AMAQI
11th Oct 20253011 AMAQI
11th Oct 20253212 PMAQI
11th Oct 2025361 PMAQI
11th Oct 2025282 PMAQI
11th Oct 2025263 PMAQI
11th Oct 2025234 PMAQI
11th Oct 2025245 PMAQI
11th Oct 2025246 PMAQI
11th Oct 2025337 PMAQI
11th Oct 2025338 PMAQI
11th Oct 2025339 PMAQI
11th Oct 20254210 PMAQI
11th Oct 20254311 PMAQI
12th Oct 20254712 AMAQI
12th Oct 2025511 AMAQI
12th Oct 2025532 AMAQI
12th Oct 2025523 AMAQI
12th Oct 2025504 AMAQI
12th Oct 2025465 AMAQI
12th Oct 2025456 AMAQI
19°C13/28°C
12th Oct 2025347 AMAQI
12th Oct 2025308 AMAQI
12th Oct 2025289 AMAQI
12th Oct 20252610 AMAQI
12th Oct 20252611 AMAQI
12th Oct 20252112 PMAQI
12th Oct 2025211 PMAQI
12th Oct 2025232 PMAQI
12th Oct 2025223 PMAQI
12th Oct 2025244 PMAQI
12th Oct 2025265 PMAQI
12th Oct 2025276 PMAQI
12th Oct 2025277 PMAQI
12th Oct 2025278 PMAQI
12th Oct 2025319 PMAQI
12th Oct 20253110 PMAQI
12th Oct 20253011 PMAQI
13th Oct 20253212 AMAQI
13th Oct 2025331 AMAQI
13th Oct 2025252 AMAQI
13th Oct 2025273 AMAQI
13th Oct 2025334 AMAQI
13th Oct 2025345 AMAQI
13th Oct 2025346 AMAQI
19°C11/28°C
13th Oct 2025267 AMAQI
13th Oct 2025328 AMAQI
13th Oct 2025429 AMAQI
13th Oct 20253810 AMAQI
13th Oct 20254011 AMAQI
13th Oct 20253912 PMAQI
13th Oct 2025411 PMAQI
13th Oct 2025422 PMAQI
13th Oct 2025453 PMAQI
13th Oct 2025364 PMAQI
13th Oct 2025365 PMAQI
13th Oct 2025396 PMAQI
13th Oct 2025377 PMAQI
13th Oct 2025338 PMAQI
13th Oct 2025369 PMAQI
13th Oct 20253710 PMAQI
13th Oct 20253911 PMAQI
14th Oct 20253912 AMAQI
14th Oct 2025381 AMAQI
14th Oct 2025342 AMAQI
14th Oct 2025333 AMAQI
14th Oct 2025344 AMAQI
14th Oct 2025335 AMAQI
14th Oct 2025346 AMAQI
20°C12/29°C
14th Oct 2025357 AMAQI
14th Oct 2025378 AMAQI
14th Oct 2025449 AMAQI
14th Oct 20254810 AMAQI
14th Oct 20254711 AMAQI
14th Oct 20254512 PMAQI
14th Oct 2025381 PMAQI
14th Oct 2025382 PMAQI
14th Oct 2025313 PMAQI
14th Oct 2025344 PMAQI
14th Oct 2025205 PMAQI
14th Oct 2025226 PMAQI
14th Oct 2025257 PMAQI
14th Oct 2025278 PMAQI
14th Oct 2025309 PMAQI
14th Oct 20252510 PMAQI
14th Oct 20253111 PMAQI
15th Oct 20253712 AMAQI
15th Oct 2025341 AMAQI
15th Oct 2025242 AMAQI
15th Oct 2025283 AMAQI
15th Oct 2025384 AMAQI
15th Oct 2025255 AMAQI
15th Oct 2025216 AMAQI
22°C14/31°C
15th Oct 2025247 AMAQI
15th Oct 2025258 AMAQI
15th Oct 2025289 AMAQI
15th Oct 20253610 AMAQI
15th Oct 20254611 AMAQI
15th Oct 20253912 PMAQI
15th Oct 2025341 PMAQI
15th Oct 2025322 PMAQI
15th Oct 2025303 PMAQI
15th Oct 2025344 PMAQI
15th Oct 2025285 PMAQI
15th Oct 2025256 PMAQI
15th Oct 2025257 PMAQI
15th Oct 2025258 PMAQI
15th Oct 2025289 PMAQI
15th Oct 20253110 PMAQI
15th Oct 20252911 PMAQI
16th Oct 20253412 AMAQI
16th Oct 2025381 AMAQI
16th Oct 2025382 AMAQI
16th Oct 2025363 AMAQI
16th Oct 2025374 AMAQI
16th Oct 2025355 AMAQI
16th Oct 2025346 AMAQI
22°C13/31°C
16th Oct 2025347 AMAQI
16th Oct 2025318 AMAQI
16th Oct 2025319 AMAQI
16th Oct 20253110 AMAQI
16th Oct 20253211 AMAQI
16th Oct 20253712 PMAQI
16th Oct 2025301 PMAQI
16th Oct 2025282 PMAQI
16th Oct 2025343 PMAQI
16th Oct 2025324 PMAQI
16th Oct 2025315 PMAQI
16th Oct 2025326 PMAQI
16th Oct 2025347 PMAQI
16th Oct 2025318 PMAQI
16th Oct 2025379 PMAQI
16th Oct 20253710 PMAQI
16th Oct 20253411 PMAQI
17th Oct 20253212 AMAQI
17th Oct 2025351 AMAQI
17th Oct 2025352 AMAQI
17th Oct 2025313 AMAQI
17th Oct 2025364 AMAQI
17th Oct 2025395 AMAQI
17th Oct 2025366 AMAQI
22°C15/29°C
17th Oct 2025337 AMAQI
17th Oct 2025218 AMAQI
17th Oct 2025279 AMAQI
17th Oct 20253210 AMAQI
17th Oct 20253111 AMAQI
17th Oct 20253212 PMAQI
17th Oct 2025401 PMAQI
17th Oct 2025342 PMAQI
17th Oct 2025293 PMAQI
17th Oct 2025324 PMAQI
17th Oct 2025305 PMAQI
17th Oct 2025306 PMAQI
17th Oct 2025257 PMAQI
17th Oct 2025278 PMAQI
17th Oct 2025319 PMAQI
17th Oct 20253410 PMAQI
17th Oct 20254111 PMAQI
18th Oct 20255012 AMAQI
18th Oct 2025521 AMAQI
18th Oct 2025552 AMAQI
18th Oct 2025563 AMAQI
18th Oct 2025554 AMAQI
18th Oct 2025545 AMAQI
18th Oct 2025496 AMAQI
22°C15/29°C
18th Oct 2025547 AMAQI
18th Oct 2025558 AMAQI
18th Oct 2025519 AMAQI
18th Oct 20255010 AMAQI
18th Oct 20255411 AMAQI
18th Oct 20255012 PMAQI
18th Oct 2025491 PMAQI
18th Oct 2025402 PMAQI
18th Oct 2025363 PMAQI
18th Oct 2025344 PMAQI
18th Oct 2025315 PMAQI
18th Oct 2025286 PMAQI
18th Oct 2025267 PMAQI
18th Oct 2025308 PMAQI
18th Oct 2025289 PMAQI
18th Oct 20252310 PMAQI
18th Oct 20253411 PMAQI
19th Oct 20254112 AMAQI
19th Oct 2025401 AMAQI
19th Oct 2025432 AMAQI
19th Oct 2025393 AMAQI
19th Oct 2025414 AMAQI
19th Oct 2025475 AMAQI
19th Oct 2025466 AMAQI
22°C17/30°C
19th Oct 2025447 AMAQI
19th Oct 2025418 AMAQI
19th Oct 2025439 AMAQI
19th Oct 20254110 AMAQI
19th Oct 20254311 AMAQI
19th Oct 20253912 PMAQI
19th Oct 2025371 PMAQI
19th Oct 2025322 PMAQI
19th Oct 2025253 PMAQI
19th Oct 2025254 PMAQI
19th Oct 2025215 PMAQI
19th Oct 2025276 PMAQI
19th Oct 2025207 PMAQI
19th Oct 2025348 PMAQI
19th Oct 2025329 PMAQI
19th Oct 20253010 PMAQI
19th Oct 20253011 PMAQI
20th Oct 20253212 AMAQI
20th Oct 2025271 AMAQI
20th Oct 2025252 AMAQI
20th Oct 2025223 AMAQI
20th Oct 2025224 AMAQI
20th Oct 2025245 AMAQI
20th Oct 2025276 AMAQI
14°C9/18°C
20th Oct 2025257 AMAQI
20th Oct 2025288 AMAQI
20th Oct 2025239 AMAQI
20th Oct 20252910 AMAQI
20th Oct 20252611 AMAQI
20th Oct 20252212 PMAQI
20th Oct 2025221 PMAQI
20th Oct 2025222 PMAQI
20th Oct 2025273 PMAQI
20th Oct 2025194 PMAQI
20th Oct 2025205 PMAQI
20th Oct 2025306 PMAQI
20th Oct 2025277 PMAQI
20th Oct 2025268 PMAQI
20th Oct 2025249 PMAQI
20th Oct 20252310 PMAQI
20th Oct 20251711 PMAQI
21st Oct 20251912 AMAQI
21st Oct 2025241 AMAQI
21st Oct 2025222 AMAQI
21st Oct 2025203 AMAQI
21st Oct 2025244 AMAQI
21st Oct 2025295 AMAQI
21st Oct 2025286 AMAQI
14°C7/24°C
21st Oct 2025237 AMAQI
21st Oct 2025228 AMAQI
21st Oct 2025259 AMAQI
21st Oct 20253710 AMAQI
21st Oct 20253911 AMAQI
21st Oct 20254112 PMAQI
21st Oct 2025411 PMAQI
21st Oct 2025432 PMAQI
21st Oct 2025333 PMAQI
21st Oct 2025274 PMAQI
21st Oct 2025245 PMAQI
21st Oct 2025236 PMAQI
21st Oct 2025277 PMAQI
21st Oct 2025278 PMAQI
21st Oct 2025309 PMAQI
21st Oct 20253710 PMAQI
21st Oct 20253211 PMAQI
22nd Oct 20253412 AMAQI
22nd Oct 2025341 AMAQI
22nd Oct 2025342 AMAQI
22nd Oct 2025343 AMAQI
22nd Oct 2025364 AMAQI
22nd Oct 2025375 AMAQI
22nd Oct 2025396 AMAQI
15°C9/20°C
22nd Oct 2025397 AMAQI
22nd Oct 2025448 AMAQI
22nd Oct 2025449 AMAQI
22nd Oct 20254510 AMAQI
22nd Oct 20254511 AMAQI
22nd Oct 20254712 PMAQI
22nd Oct 2025471 PMAQI
22nd Oct 2025392 PMAQI
22nd Oct 2025363 PMAQI
22nd Oct 2025324 PMAQI
22nd Oct 2025305 PMAQI
22nd Oct 2025276 PMAQI
22nd Oct 2025257 PMAQI
22nd Oct 2025318 PMAQI
22nd Oct 2025379 PMAQI
22nd Oct 20253410 PMAQI
22nd Oct 20254311 PMAQI
23rd Oct 20254812 AMAQI
23rd Oct 2025491 AMAQI
23rd Oct 2025362 AMAQI
23rd Oct 2025303 AMAQI
23rd Oct 2025294 AMAQI
23rd Oct 2025265 AMAQI
23rd Oct 2025246 AMAQI
12°C6/20°C
23rd Oct 2025267 AMAQI
23rd Oct 2025268 AMAQI
23rd Oct 2025329 AMAQI
23rd Oct 20253710 AMAQI
23rd Oct 20253211 AMAQI
23rd Oct 20253112 PMAQI
23rd Oct 2025331 PMAQI
23rd Oct 2025432 PMAQI
23rd Oct 2025363 PMAQI
23rd Oct 2025344 PMAQI
23rd Oct 2025185 PMAQI
23rd Oct 2025196 PMAQI
23rd Oct 2025277 PMAQI
23rd Oct 2025268 PMAQI
23rd Oct 2025229 PMAQI
23rd Oct 20252910 PMAQI
23rd Oct 20253111 PMAQI
24th Oct 20253512 AMAQI
24th Oct 2025391 AMAQI
24th Oct 2025472 AMAQI
24th Oct 2025343 AMAQI
24th Oct 2025364 AMAQI
24th Oct 2025375 AMAQI
24th Oct 2025336 AMAQI
12°C4/20°C
24th Oct 2025277 AMAQI
24th Oct 2025268 AMAQI
24th Oct 2025299 AMAQI
24th Oct 20253610 AMAQI
24th Oct 20254111 AMAQI
24th Oct 20254312 PMAQI
24th Oct 2025451 PMAQI
24th Oct 2025392 PMAQI
24th Oct 2025353 PMAQI
24th Oct 2025304 PMAQI
24th Oct 2025275 PMAQI
24th Oct 2025306 PMAQI
24th Oct 2025307 PMAQI
24th Oct 2025358 PMAQI
24th Oct 2025379 PMAQI
24th Oct 20253110 PMAQI
24th Oct 20253711 PMAQI
25th Oct 20254612 AMAQI
25th Oct 2025431 AMAQI
25th Oct 2025452 AMAQI
25th Oct 2025383 AMAQI
25th Oct 2025374 AMAQI
25th Oct 2025365 AMAQI
25th Oct 2025336 AMAQI
12°C3/21°C
25th Oct 2025257 AMAQI
25th Oct 2025278 AMAQI
25th Oct 2025259 AMAQI
25th Oct 20252510 AMAQI
25th Oct 20252611 AMAQI
25th Oct 20252612 PMAQI
25th Oct 2025231 PMAQI
25th Oct 2025232 PMAQI
25th Oct 2025233 PMAQI
25th Oct 2025204 PMAQI
25th Oct 2025215 PMAQI
25th Oct 2025206 PMAQI
25th Oct 2025177 PMAQI
25th Oct 2025218 PMAQI
25th Oct 2025279 PMAQI
25th Oct 20253410 PMAQI
25th Oct 20253711 PMAQI
26th Oct 20253712 AMAQI
26th Oct 2025411 AMAQI
26th Oct 2025432 AMAQI
26th Oct 2025403 AMAQI
26th Oct 2025374 AMAQI
26th Oct 2025395 AMAQI
26th Oct 2025416 AMAQI
14°C11/19°C
26th Oct 2025407 AMAQI
26th Oct 2025388 AMAQI
26th Oct 2025389 AMAQI
26th Oct 20253410 AMAQI
26th Oct 20253311 AMAQI
26th Oct 20253112 PMAQI
26th Oct 2025281 PMAQI
26th Oct 2025252 PMAQI
26th Oct 2025243 PMAQI
26th Oct 2025254 PMAQI
26th Oct 2025235 PMAQI
26th Oct 2025246 PMAQI
26th Oct 2025257 PMAQI
26th Oct 2025278 PMAQI
26th Oct 2025299 PMAQI
26th Oct 20253310 PMAQI
26th Oct 20254011 PMAQI
27th Oct 20253812 AMAQI
27th Oct 2025401 AMAQI
27th Oct 2025412 AMAQI
27th Oct 2025453 AMAQI
27th Oct 2025434 AMAQI
27th Oct 2025245 AMAQI
27th Oct 2025256 AMAQI
13°C11/16°C
27th Oct 2025287 AMAQI
27th Oct 2025268 AMAQI
27th Oct 2025289 AMAQI
27th Oct 20253010 AMAQI
27th Oct 20253111 AMAQI
27th Oct 20253212 PMAQI
27th Oct 2025371 PMAQI
27th Oct 2025362 PMAQI
27th Oct 2025293 PMAQI
27th Oct 2025254 PMAQI
27th Oct 2025275 PMAQI
27th Oct 2025256 PMAQI
27th Oct 2025277 PMAQI
27th Oct 2025278 PMAQI
27th Oct 2025289 PMAQI
27th Oct 20253310 PMAQI
27th Oct 20253311 PMAQI
28th Oct 20253612 AMAQI
28th Oct 2025331 AMAQI
28th Oct 2025402 AMAQI
28th Oct 2025413 AMAQI
28th Oct 2025394 AMAQI
28th Oct 2025415 AMAQI
28th Oct 2025436 AMAQI
11°C10/12°C
28th Oct 2025367 AMAQI
28th Oct 2025358 AMAQI
28th Oct 2025359 AMAQI
28th Oct 20253510 AMAQI
28th Oct 20253511 AMAQI
28th Oct 20253712 PMAQI
28th Oct 2025361 PMAQI
28th Oct 2025312 PMAQI
28th Oct 2025283 PMAQI
28th Oct 2025264 PMAQI
28th Oct 2025235 PMAQI
28th Oct 2025206 PMAQI
28th Oct 2025227 PMAQI
28th Oct 2025218 PMAQI
28th Oct 2025279 PMAQI
28th Oct 20253110 PMAQI
28th Oct 20253311 PMAQI
29th Oct 20253212 AMAQI
29th Oct 2025301 AMAQI
29th Oct 2025262 AMAQI
29th Oct 2025263 AMAQI
29th Oct 2025274 AMAQI
29th Oct 2025275 AMAQI
29th Oct 2025276 AMAQI
12°C11/14°C
29th Oct 2025267 AMAQI
29th Oct 2025248 AMAQI
29th Oct 2025259 AMAQI
29th Oct 20252410 AMAQI
29th Oct 20252711 AMAQI
29th Oct 20252712 PMAQI
29th Oct 2025311 PMAQI
29th Oct 2025332 PMAQI
29th Oct 2025413 PMAQI
29th Oct 2025394 PMAQI
29th Oct 2025385 PMAQI
29th Oct 2025306 PMAQI
29th Oct 2025297 PMAQI
29th Oct 2025318 PMAQI
29th Oct 2025359 PMAQI
29th Oct 20254110 PMAQI
29th Oct 20254611 PMAQI
30th Oct 20254612 AMAQI
30th Oct 2025421 AMAQI
30th Oct 2025422 AMAQI
30th Oct 2025453 AMAQI
30th Oct 2025434 AMAQI
30th Oct 2025415 AMAQI
30th Oct 2025396 AMAQI
12°C9/13°C
30th Oct 2025387 AMAQI
30th Oct 2025308 AMAQI
30th Oct 2025269 AMAQI
30th Oct 20253210 AMAQI
30th Oct 20252511 AMAQI
30th Oct 20252712 PMAQI
30th Oct 2025251 PMAQI
30th Oct 2025242 PMAQI
30th Oct 2025243 PMAQI
30th Oct 2025254 PMAQI
30th Oct 2025235 PMAQI
30th Oct 2025216 PMAQI
30th Oct 2025207 PMAQI
30th Oct 2025328 PMAQI
30th Oct 2025399 PMAQI
30th Oct 20254110 PMAQI
30th Oct 20254011 PMAQI
31st Oct 20253812 AMAQI
31st Oct 2025341 AMAQI
31st Oct 2025262 AMAQI
31st Oct 2025253 AMAQI
31st Oct 2025244 AMAQI
31st Oct 2025275 AMAQI
31st Oct 2025286 AMAQI
9°C5/11°C
31st Oct 2025267 AMAQI
31st Oct 2025288 AMAQI
31st Oct 2025289 AMAQI
31st Oct 20252610 AMAQI
31st Oct 20252411 AMAQI
31st Oct 20252612 PMAQI
31st Oct 2025311 PMAQI
31st Oct 2025302 PMAQI
31st Oct 2025283 PMAQI
31st Oct 2025244 PMAQI
31st Oct 2025215 PMAQI
31st Oct 2025216 PMAQI
31st Oct 2025197 PMAQI
31st Oct 2025198 PMAQI
31st Oct 2025279 PMAQI
31st Oct 20252810 PMAQI
31st Oct 20252511 PMAQI
1st Nov 20252612 AMAQI
1st Nov 2025251 AMAQI
1st Nov 2025242 AMAQI
1st Nov 2025263 AMAQI
1st Nov 2025274 AMAQI
1st Nov 2025315 AMAQI
1st Nov 2025326 AMAQI
10°C4/17°C
1st Nov 2025297 AMAQI
1st Nov 2025258 AMAQI
1st Nov 2025259 AMAQI
1st Nov 20253310 AMAQI
1st Nov 20253211 AMAQI
1st Nov 20253512 PMAQI
1st Nov 2025361 PMAQI
1st Nov 2025362 PMAQI
1st Nov 2025293 PMAQI
1st Nov 2025254 PMAQI
1st Nov 2025265 PMAQI
1st Nov 2025226 PMAQI
1st Nov 2025207 PMAQI
1st Nov 2025188 PMAQI
1st Nov 2025289 PMAQI
1st Nov 20253610 PMAQI
1st Nov 20254111 PMAQI
2nd Nov 20253812 AMAQI
2nd Nov 2025451 AMAQI
2nd Nov 2025522 AMAQI
2nd Nov 2025533 AMAQI
2nd Nov 2025534 AMAQI
2nd Nov 2025515 AMAQI
2nd Nov 2025476 AMAQI
9°C7/14°C
2nd Nov 2025467 AMAQI
7 AM2nd Nov 2025468 AMAQI
2nd Nov 2025459 AMAQI
2nd Nov 20254510 AMAQI
2nd Nov 20254711 AMAQI
2nd Nov 20254912 PMAQI
12 PM2nd Nov 2025491 PMAQI
2nd Nov 2025362 PMAQI
2nd Nov 2025283 PMAQI
2nd Nov 2025294 PMAQI
6 PM
12 AM
6 AM
--°C/°C
Day time
Avg. Highest Time
10 AM - 1 PM
37AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
5 PM - 6 PM
27AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 AM to 1 PM (Avg. 37), while the lowest AQI was between 5 PM to 6 PM (Avg. 27).
Night time
Avg. Highest Time
12 AM - 6 AM
36AQI
7 hours / Day
210 hours / Month
Avg. Lowest Time
7 PM
27AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 6 AM (Avg. 36), while the lowest AQI was between 7 PM to 7 PM (Avg. 27).
2025 Days Vs Air Quality
Chester, Illinois, United States
2025
79%
241
21%
63
0.3%
1
Total number of days with different AQI categories in last 306 days in 2025 (59 days remaining)
Good
241 DaysModerate
63 DaysPoor
1 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 79%
Health Risk Level:
Low
In 2025, 79% of 306 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
Chester, Illinois, United States
AQI levels in 2025
AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
22AQI
22AQI
2nd January 2025
25AQI
25AQI
3rd January 2025
24AQI
24AQI
4th January 2025
20AQI
20AQI
5th January 2025
20AQI
20AQI
6th January 2025
20AQI
20AQI
7th January 2025
24AQI
24AQI
8th January 2025
42AQI
42AQI
9th January 2025
54AQI
54AQI
10th January 2025
54AQI
54AQI
11th January 2025
35AQI
35AQI
12th January 2025
31AQI
31AQI
13th January 2025
23AQI
23AQI
14th January 2025
26AQI
26AQI
15th January 2025
33AQI
33AQI
16th January 2025
30AQI
30AQI
17th January 2025
27AQI
27AQI
18th January 2025
20AQI
20AQI
19th January 2025
19AQI
19AQI
20th January 2025
20AQI
20AQI
21st January 2025
22AQI
22AQI
22nd January 2025
25AQI
25AQI
23rd January 2025
26AQI
26AQI
24th January 2025
30AQI
30AQI
25th January 2025
28AQI
28AQI
26th January 2025
27AQI
27AQI
27th January 2025
22AQI
22AQI
28th January 2025
23AQI
23AQI
29th January 2025
24AQI
24AQI
30th January 2025
30AQI
30AQI
31st January 2025
21AQI
21AQI
1st February 2025
31AQI
31AQI
2nd February 2025
26AQI
26AQI
3rd February 2025
33AQI
33AQI
4th February 2025
29AQI
29AQI
5th February 2025
29AQI
29AQI
6th February 2025
26AQI
26AQI
7th February 2025
25AQI
25AQI
8th February 2025
32AQI
32AQI
9th February 2025
35AQI
35AQI
10th February 2025
33AQI
33AQI
11th February 2025
30AQI
30AQI
12th February 2025
42AQI
42AQI
13th February 2025
30AQI
30AQI
14th February 2025
26AQI
26AQI
15th February 2025
23AQI
23AQI
16th February 2025
40AQI
40AQI
17th February 2025
20AQI
20AQI
18th February 2025
22AQI
22AQI
19th February 2025
21AQI
21AQI
20th February 2025
22AQI
22AQI
21st February 2025
30AQI
30AQI
22nd February 2025
37AQI
37AQI
23rd February 2025
32AQI
32AQI
24th February 2025
28AQI
28AQI
25th February 2025
28AQI
28AQI
26th February 2025
26AQI
26AQI
27th February 2025
30AQI
30AQI
28th February 2025
28AQI
28AQI
1st March 2025
27AQI
27AQI
2nd March 2025
27AQI
27AQI
3rd March 2025
32AQI
32AQI
4th March 2025
42AQI
42AQI
5th March 2025
26AQI
26AQI
6th March 2025
27AQI
27AQI
7th March 2025
28AQI
28AQI
8th March 2025
33AQI
33AQI
9th March 2025
40AQI
40AQI
10th March 2025
46AQI
46AQI
11th March 2025
56AQI
56AQI
12th March 2025
55AQI
55AQI
13th March 2025
67AQI
67AQI
14th March 2025
50AQI
50AQI
15th March 2025
117AQI
117AQI
16th March 2025
29AQI
29AQI
17th March 2025
32AQI
32AQI
18th March 2025
25AQI
25AQI
19th March 2025
31AQI
31AQI
20th March 2025
19AQI
19AQI
21st March 2025
27AQI
27AQI
22nd March 2025
21AQI
21AQI
23rd March 2025
26AQI
26AQI
24th March 2025
19AQI
19AQI
25th March 2025
20AQI
20AQI
26th March 2025
33AQI
33AQI
27th March 2025
46AQI
46AQI
28th March 2025
45AQI
45AQI
29th March 2025
47AQI
47AQI
30th March 2025
32AQI
32AQI
31st March 2025
20AQI
20AQI
1st April 2025
28AQI
28AQI
2nd April 2025
31AQI
31AQI
3rd April 2025
25AQI
25AQI
4th April 2025
22AQI
22AQI
5th April 2025
18AQI
18AQI
6th April 2025
23AQI
23AQI
7th April 2025
26AQI
26AQI
8th April 2025
18AQI
18AQI
9th April 2025
22AQI
22AQI
10th April 2025
40AQI
40AQI
11th April 2025
39AQI
39AQI
12th April 2025
44AQI
44AQI
13th April 2025
43AQI
43AQI
14th April 2025
41AQI
41AQI
15th April 2025
23AQI
23AQI
16th April 2025
28AQI
28AQI
17th April 2025
45AQI
45AQI
18th April 2025
60AQI
60AQI
19th April 2025
40AQI
40AQI
20th April 2025
49AQI
49AQI
21st April 2025
21AQI
21AQI
22nd April 2025
26AQI
26AQI
23rd April 2025
32AQI
32AQI
24th April 2025
41AQI
41AQI
25th April 2025
40AQI
40AQI
26th April 2025
34AQI
34AQI
27th April 2025
24AQI
24AQI
28th April 2025
37AQI
37AQI
29th April 2025
41AQI
41AQI
30th April 2025
38AQI
38AQI
1st May 2025
27AQI
27AQI
2nd May 2025
27AQI
27AQI
3rd May 2025
30AQI
30AQI
4th May 2025
22AQI
22AQI
5th May 2025
19AQI
19AQI
6th May 2025
26AQI
26AQI
7th May 2025
23AQI
23AQI
8th May 2025
27AQI
27AQI
9th May 2025
25AQI
25AQI
10th May 2025
26AQI
26AQI
11th May 2025
32AQI
32AQI
12th May 2025
25AQI
25AQI
13th May 2025
22AQI
22AQI
14th May 2025
41AQI
41AQI
15th May 2025
54AQI
54AQI
16th May 2025
54AQI
54AQI
17th May 2025
27AQI
27AQI
18th May 2025
22AQI
22AQI
19th May 2025
29AQI
29AQI
20th May 2025
29AQI
29AQI
21st May 2025
16AQI
16AQI
22nd May 2025
14AQI
14AQI
23rd May 2025
17AQI
17AQI
24th May 2025
29AQI
29AQI
25th May 2025
34AQI
34AQI
26th May 2025
22AQI
22AQI
27th May 2025
21AQI
21AQI
28th May 2025
28AQI
28AQI
29th May 2025
37AQI
37AQI
30th May 2025
29AQI
29AQI
31st May 2025
41AQI
41AQI
1st June 2025
39AQI
39AQI
2nd June 2025
44AQI
44AQI
3rd June 2025
57AQI
57AQI
4th June 2025
61AQI
61AQI
5th June 2025
52AQI
52AQI
6th June 2025
47AQI
47AQI
7th June 2025
53AQI
53AQI
8th June 2025
53AQI
53AQI
9th June 2025
57AQI
57AQI
10th June 2025
61AQI
61AQI
11th June 2025
68AQI
68AQI
12th June 2025
79AQI
79AQI
13th June 2025
44AQI
44AQI
14th June 2025
38AQI
38AQI
15th June 2025
41AQI
41AQI
16th June 2025
28AQI
28AQI
17th June 2025
36AQI
36AQI
18th June 2025
34AQI
34AQI
19th June 2025
26AQI
26AQI
20th June 2025
38AQI
38AQI
21st June 2025
50AQI
50AQI
22nd June 2025
53AQI
53AQI
23rd June 2025
57AQI
57AQI
24th June 2025
55AQI
55AQI
25th June 2025
54AQI
54AQI
26th June 2025
52AQI
52AQI
27th June 2025
42AQI
42AQI
28th June 2025
28AQI
28AQI
29th June 2025
27AQI
27AQI
30th June 2025
29AQI
29AQI
1st July 2025
30AQI
30AQI
2nd July 2025
38AQI
38AQI
3rd July 2025
53AQI
53AQI
4th July 2025
60AQI
60AQI
5th July 2025
70AQI
70AQI
6th July 2025
59AQI
59AQI
7th July 2025
40AQI
40AQI
8th July 2025
39AQI
39AQI
9th July 2025
34AQI
34AQI
10th July 2025
42AQI
42AQI
11th July 2025
43AQI
43AQI
12th July 2025
40AQI
40AQI
13th July 2025
33AQI
33AQI
14th July 2025
33AQI
33AQI
15th July 2025
34AQI
34AQI
16th July 2025
34AQI
34AQI
17th July 2025
37AQI
37AQI
18th July 2025
31AQI
31AQI
19th July 2025
43AQI
43AQI
20th July 2025
52AQI
52AQI
21st July 2025
34AQI
34AQI
22nd July 2025
41AQI
41AQI
23rd July 2025
50AQI
50AQI
24th July 2025
54AQI
54AQI
25th July 2025
54AQI
54AQI
26th July 2025
44AQI
44AQI
27th July 2025
30AQI
30AQI
28th July 2025
36AQI
36AQI
29th July 2025
45AQI
45AQI
30th July 2025
46AQI
46AQI
31st July 2025
38AQI
38AQI
1st August 2025
89AQI
89AQI
2nd August 2025
78AQI
78AQI
3rd August 2025
51AQI
51AQI
4th August 2025
38AQI
38AQI
5th August 2025
40AQI
40AQI
6th August 2025
45AQI
45AQI
7th August 2025
50AQI
50AQI
8th August 2025
52AQI
52AQI
9th August 2025
49AQI
49AQI
10th August 2025
47AQI
47AQI
11th August 2025
44AQI
44AQI
12th August 2025
41AQI
41AQI
13th August 2025
38AQI
38AQI
14th August 2025
52AQI
52AQI
15th August 2025
53AQI
53AQI
16th August 2025
53AQI
53AQI
17th August 2025
53AQI
53AQI
18th August 2025
52AQI
52AQI
19th August 2025
51AQI
51AQI
20th August 2025
32AQI
32AQI
21st August 2025
22AQI
22AQI
22nd August 2025
26AQI
26AQI
23rd August 2025
36AQI
36AQI
24th August 2025
29AQI
29AQI
25th August 2025
25AQI
25AQI
26th August 2025
25AQI
25AQI
27th August 2025
30AQI
30AQI
28th August 2025
34AQI
34AQI
29th August 2025
42AQI
42AQI
30th August 2025
40AQI
40AQI
31st August 2025
32AQI
32AQI
1st September 2025
29AQI
29AQI
2nd September 2025
29AQI
29AQI
3rd September 2025
37AQI
37AQI
4th September 2025
59AQI
59AQI
5th September 2025
57AQI
57AQI
6th September 2025
33AQI
33AQI
7th September 2025
26AQI
26AQI
8th September 2025
25AQI
25AQI
9th September 2025
34AQI
34AQI
10th September 2025
48AQI
48AQI
11th September 2025
56AQI
56AQI
12th September 2025
59AQI
59AQI
13th September 2025
60AQI
60AQI
14th September 2025
57AQI
57AQI
15th September 2025
55AQI
55AQI
16th September 2025
59AQI
59AQI
17th September 2025
57AQI
57AQI
18th September 2025
56AQI
56AQI
19th September 2025
46AQI
46AQI
20th September 2025
51AQI
51AQI
21st September 2025
48AQI
48AQI
22nd September 2025
38AQI
38AQI
23rd September 2025
44AQI
44AQI
24th September 2025
37AQI
37AQI
25th September 2025
32AQI
32AQI
26th September 2025
30AQI
30AQI
27th September 2025
37AQI
37AQI
28th September 2025
34AQI
34AQI
29th September 2025
51AQI
51AQI
30th September 2025
58AQI
58AQI
1st October 2025
56AQI
56AQI
2nd October 2025
53AQI
53AQI
3rd October 2025
51AQI
51AQI
4th October 2025
62AQI
62AQI
5th October 2025
50AQI
50AQI
6th October 2025
44AQI
44AQI
7th October 2025
37AQI
37AQI
8th October 2025
37AQI
37AQI
9th October 2025
45AQI
45AQI
10th October 2025
54AQI
54AQI
11th October 2025
41AQI
41AQI
12th October 2025
46AQI
46AQI
13th October 2025
57AQI
57AQI
14th October 2025
63AQI
63AQI
15th October 2025
66AQI
66AQI
16th October 2025
61AQI
61AQI
17th October 2025
53AQI
53AQI
18th October 2025
56AQI
56AQI
19th October 2025
18AQI
18AQI
20th October 2025
22AQI
22AQI
21st October 2025
23AQI
23AQI
22nd October 2025
20AQI
20AQI
23rd October 2025
27AQI
27AQI
24th October 2025
40AQI
40AQI
25th October 2025
24AQI
24AQI
26th October 2025
22AQI
22AQI
27th October 2025
24AQI
24AQI
28th October 2025
33AQI
33AQI
29th October 2025
20AQI
20AQI
30th October 2025
24AQI
24AQI
31st October 2025
25AQI
25AQI
1st November 2025
20AQI
20AQI
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025
27AQI
29AQI
37AQI
33AQI
28AQI
47AQI
42AQI
44AQI
45AQI
40AQI
20AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202537AQI
29
2
28
27
3
1
29
1
29
2
16
14
24
7
21
10
17
13
20
11
1
241
63
1
Highest AQI recorded in
June47AQI
Lowest AQI recorded in
November20AQI
202431AQI
30
1
26
3
31
30
31
28
1
29
2
29
2
30
27
4
30
31
352
13
Highest AQI recorded in
October37AQI
Lowest AQI recorded in
January24AQI
202338AQI
27
4
28
30
1
27
3
25
6
8
22
28
3
23
8
26
4
27
4
29
31
309
55
Highest AQI recorded in
June59AQI
Lowest AQI recorded in
December25AQI
202236AQI
27
4
21
30
1
17
27
4
25
5
19
4
2
28
1
27
4
26
4
23
8
272
35
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
September32AQI
202138AQI
28
2
17
5
24
4
27
3
29
2
23
5
16
15
24
7
21
4
29
2
17
3
27
4
282
56
Highest AQI recorded in
July50AQI
Lowest AQI recorded in
October30AQI
202040AQI
10
3
17
3
18
24
4
2
27
4
30
1
27
2
27
2
1
25
3
21
8
226
30
3
Highest AQI recorded in
June48AQI
Lowest AQI recorded in
May32AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2020(Avg.)
40AQILeast Polluted Year Recorded
2024(Avg.)
31AQIChester's annual 2025 AQI (37) shows an average percentage change of 2.9% (worsened AQI) compared to previous years: 2020 (40), 2021 (38), 2022 (36), 2023 (38), 2024 (31).
