Houston, 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+
August Air Quality Analysis
Houston, Chester, Illinois, United States
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
1st Aug 2021
97AQILowest AQI recorded on
27th Aug 2023
21AQISame Day Analysis (8th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 52 of Moderate air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 9th Aug - 10th Aug 2025
Houston, Chester, Illinois, United States
AQI
Day
Night
.
5 AM9th Aug 2025
8 PM
4 AM10th Aug 2025
Day time
Avg. Highest Time
6PM9th Aug
50AQI
Avg. Lowest Time
10AM9th Aug
46AQI
Night time
Avg. Highest Time
12AM10th Aug
52AQI
Avg. Lowest Time
4AM10th Aug
45AQI
In the last 24 hours,
Houston's AQI reached its highest point of 52 at 12 AM during the Night, while the lowest point, 45, was recorded at 4 AM during the Night between 9th Aug and 10th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Houston, Chester, Illinois, United States
JulAug
11th - 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 - 10th10th
Day
Night
11th Jul 2025395 AMAQI
11th Jul 2025396 AMAQI
11th Jul 2025397 AMAQI
11th Jul 2025408 AMAQI
11th Jul 2025429 AMAQI
11th Jul 20254310 AMAQI
11th Jul 20254611 AMAQI
11th Jul 20254412 PMAQI
11th Jul 2025441 PMAQI
11th Jul 2025462 PMAQI
11th Jul 2025463 PMAQI
11th Jul 2025454 PMAQI
11th Jul 2025445 PMAQI
11th Jul 2025466 PMAQI
11th Jul 2025437 PMAQI
11th Jul 2025438 PMAQI
11th Jul 2025449 PMAQI
11th Jul 20254410 PMAQI
11th Jul 20254611 PMAQI
12th Jul 20254612 AMAQI
12th Jul 2025471 AMAQI
12th Jul 2025492 AMAQI
12th Jul 2025483 AMAQI
12th Jul 2025404 AMAQI
28°C21/36°C
12th Jul 2025315 AMAQI
12th Jul 2025286 AMAQI
12th Jul 2025337 AMAQI
12th Jul 2025318 AMAQI
12th Jul 2025359 AMAQI
12th Jul 20254010 AMAQI
12th Jul 20254311 AMAQI
12th Jul 20254112 PMAQI
12th Jul 2025361 PMAQI
12th Jul 2025382 PMAQI
12th Jul 2025403 PMAQI
12th Jul 2025404 PMAQI
12th Jul 2025405 PMAQI
12th Jul 2025386 PMAQI
12th Jul 2025397 PMAQI
12th Jul 2025398 PMAQI
12th Jul 2025379 PMAQI
12th Jul 20253810 PMAQI
12th Jul 20253811 PMAQI
13th Jul 20253612 AMAQI
13th Jul 2025371 AMAQI
13th Jul 2025312 AMAQI
13th Jul 2025323 AMAQI
13th Jul 2025324 AMAQI
27°C24/30°C
13th Jul 2025335 AMAQI
13th Jul 2025336 AMAQI
13th Jul 2025337 AMAQI
13th Jul 2025348 AMAQI
13th Jul 2025359 AMAQI
13th Jul 20253610 AMAQI
13th Jul 20253611 AMAQI
13th Jul 20253612 PMAQI
13th Jul 2025351 PMAQI
13th Jul 2025342 PMAQI
13th Jul 2025333 PMAQI
13th Jul 2025324 PMAQI
13th Jul 2025305 PMAQI
13th Jul 2025316 PMAQI
13th Jul 2025347 PMAQI
13th Jul 2025338 PMAQI
13th Jul 2025329 PMAQI
13th Jul 20253210 PMAQI
13th Jul 20253111 PMAQI
14th Jul 20253212 AMAQI
14th Jul 2025301 AMAQI
14th Jul 2025252 AMAQI
14th Jul 2025263 AMAQI
14th Jul 2025284 AMAQI
25°C22/33°C
14th Jul 2025285 AMAQI
14th Jul 2025276 AMAQI
14th Jul 2025287 AMAQI
14th Jul 2025278 AMAQI
14th Jul 2025289 AMAQI
14th Jul 20253410 AMAQI
14th Jul 20254011 AMAQI
14th Jul 20254712 PMAQI
14th Jul 2025451 PMAQI
14th Jul 2025392 PMAQI
14th Jul 2025363 PMAQI
14th Jul 2025374 PMAQI
14th Jul 2025355 PMAQI
14th Jul 2025356 PMAQI
14th Jul 2025347 PMAQI
14th Jul 2025338 PMAQI
14th Jul 2025349 PMAQI
14th Jul 20253410 PMAQI
14th Jul 20253411 PMAQI
15th Jul 20253412 AMAQI
15th Jul 2025341 AMAQI
15th Jul 2025322 AMAQI
15th Jul 2025323 AMAQI
15th Jul 2025334 AMAQI
24°C21/28°C
15th Jul 2025345 AMAQI
15th Jul 2025356 AMAQI
15th Jul 2025347 AMAQI
15th Jul 2025338 AMAQI
15th Jul 2025309 AMAQI
15th Jul 20253110 AMAQI
15th Jul 20253311 AMAQI
15th Jul 20253212 PMAQI
15th Jul 2025321 PMAQI
15th Jul 2025332 PMAQI
15th Jul 2025353 PMAQI
15th Jul 2025354 PMAQI
15th Jul 2025365 PMAQI
15th Jul 2025366 PMAQI
15th Jul 2025367 PMAQI
15th Jul 2025368 PMAQI
15th Jul 2025369 PMAQI
15th Jul 20253510 PMAQI
15th Jul 20253511 PMAQI
16th Jul 20253412 AMAQI
16th Jul 2025331 AMAQI
16th Jul 2025302 AMAQI
16th Jul 2025303 AMAQI
16th Jul 2025304 AMAQI
26°C21/30°C
16th Jul 2025295 AMAQI
16th Jul 2025286 AMAQI
16th Jul 2025307 AMAQI
16th Jul 2025298 AMAQI
16th Jul 2025289 AMAQI
16th Jul 20253210 AMAQI
16th Jul 20253311 AMAQI
16th Jul 20253612 PMAQI
16th Jul 2025371 PMAQI
16th Jul 2025382 PMAQI
16th Jul 2025383 PMAQI
16th Jul 2025384 PMAQI
16th Jul 2025375 PMAQI
16th Jul 2025366 PMAQI
16th Jul 2025347 PMAQI
16th Jul 2025358 PMAQI
16th Jul 2025389 PMAQI
16th Jul 20253810 PMAQI
16th Jul 20253711 PMAQI
17th Jul 20253212 AMAQI
17th Jul 2025331 AMAQI
17th Jul 2025362 AMAQI
17th Jul 2025363 AMAQI
17th Jul 2025394 AMAQI
28°C22/36°C
17th Jul 2025405 AMAQI
17th Jul 2025396 AMAQI
17th Jul 2025387 AMAQI
17th Jul 2025378 AMAQI
17th Jul 2025379 AMAQI
17th Jul 20254010 AMAQI
17th Jul 20254411 AMAQI
17th Jul 20254512 PMAQI
17th Jul 2025491 PMAQI
17th Jul 2025502 PMAQI
17th Jul 2025463 PMAQI
17th Jul 2025414 PMAQI
17th Jul 2025355 PMAQI
17th Jul 2025346 PMAQI
17th Jul 2025367 PMAQI
17th Jul 2025368 PMAQI
17th Jul 2025309 PMAQI
17th Jul 20253010 PMAQI
17th Jul 20253211 PMAQI
18th Jul 20253012 AMAQI
18th Jul 2025311 AMAQI
18th Jul 2025262 AMAQI
18th Jul 2025263 AMAQI
18th Jul 2025254 AMAQI
27°C23/34°C
18th Jul 2025245 AMAQI
18th Jul 2025266 AMAQI
18th Jul 2025267 AMAQI
18th Jul 2025268 AMAQI
18th Jul 2025269 AMAQI
18th Jul 20252710 AMAQI
18th Jul 20252711 AMAQI
18th Jul 20252812 PMAQI
18th Jul 2025341 PMAQI
18th Jul 2025352 PMAQI
18th Jul 2025333 PMAQI
18th Jul 2025354 PMAQI
18th Jul 2025375 PMAQI
18th Jul 2025376 PMAQI
18th Jul 2025317 PMAQI
18th Jul 2025328 PMAQI
18th Jul 2025439 PMAQI
18th Jul 20254110 PMAQI
18th Jul 20254111 PMAQI
19th Jul 20254112 AMAQI
19th Jul 2025411 AMAQI
19th Jul 2025402 AMAQI
19th Jul 2025383 AMAQI
19th Jul 2025374 AMAQI
27°C23/32°C
19th Jul 2025375 AMAQI
19th Jul 2025376 AMAQI
19th Jul 2025387 AMAQI
19th Jul 2025388 AMAQI
19th Jul 2025389 AMAQI
19th Jul 20253810 AMAQI
19th Jul 20254111 AMAQI
19th Jul 20254212 PMAQI
19th Jul 2025461 PMAQI
19th Jul 2025492 PMAQI
19th Jul 2025483 PMAQI
19th Jul 2025484 PMAQI
19th Jul 2025485 PMAQI
19th Jul 2025486 PMAQI
19th Jul 2025477 PMAQI
19th Jul 2025458 PMAQI
19th Jul 2025489 PMAQI
19th Jul 20254610 PMAQI
19th Jul 20254411 PMAQI
20th Jul 20254512 AMAQI
20th Jul 2025451 AMAQI
20th Jul 2025512 AMAQI
20th Jul 2025513 AMAQI
20th Jul 2025534 AMAQI
27°C23/32°C
20th Jul 2025535 AMAQI
20th Jul 2025536 AMAQI
20th Jul 2025557 AMAQI
20th Jul 2025548 AMAQI
20th Jul 2025549 AMAQI
20th Jul 20255410 AMAQI
20th Jul 20255411 AMAQI
20th Jul 20255412 PMAQI
20th Jul 2025521 PMAQI
20th Jul 2025532 PMAQI
20th Jul 2025543 PMAQI
20th Jul 2025524 PMAQI
20th Jul 2025525 PMAQI
20th Jul 2025526 PMAQI
20th Jul 2025527 PMAQI
20th Jul 2025528 PMAQI
20th Jul 2025509 PMAQI
20th Jul 20255110 PMAQI
20th Jul 20255211 PMAQI
21st Jul 20255112 AMAQI
21st Jul 2025511 AMAQI
21st Jul 2025472 AMAQI
21st Jul 2025403 AMAQI
21st Jul 2025304 AMAQI
30°C24/36°C
21st Jul 2025245 AMAQI
21st Jul 2025236 AMAQI
21st Jul 2025267 AMAQI
21st Jul 2025278 AMAQI
21st Jul 2025289 AMAQI
21st Jul 20252810 AMAQI
21st Jul 20252811 AMAQI
21st Jul 20252812 PMAQI
21st Jul 2025291 PMAQI
21st Jul 2025322 PMAQI
21st Jul 2025313 PMAQI
21st Jul 2025324 PMAQI
21st Jul 2025315 PMAQI
21st Jul 2025326 PMAQI
21st Jul 2025317 PMAQI
21st Jul 2025318 PMAQI
21st Jul 2025349 PMAQI
21st Jul 20253510 PMAQI
21st Jul 20253411 PMAQI
22nd Jul 20253412 AMAQI
22nd Jul 2025331 AMAQI
22nd Jul 2025342 AMAQI
22nd Jul 2025343 AMAQI
22nd Jul 2025364 AMAQI
27°C23/31°C
22nd Jul 2025365 AMAQI
22nd Jul 2025396 AMAQI
22nd Jul 2025387 AMAQI
22nd Jul 2025398 AMAQI
22nd Jul 2025399 AMAQI
22nd Jul 20254210 AMAQI
22nd Jul 20254211 AMAQI
22nd Jul 20254212 PMAQI
22nd Jul 2025421 PMAQI
22nd Jul 2025462 PMAQI
22nd Jul 2025463 PMAQI
22nd Jul 2025484 PMAQI
22nd Jul 2025485 PMAQI
22nd Jul 2025496 PMAQI
22nd Jul 2025417 PMAQI
22nd Jul 2025418 PMAQI
22nd Jul 2025489 PMAQI
22nd Jul 20254710 PMAQI
22nd Jul 20254811 PMAQI
23rd Jul 20254612 AMAQI
23rd Jul 2025461 AMAQI
23rd Jul 2025422 AMAQI
23rd Jul 2025423 AMAQI
23rd Jul 2025444 AMAQI
28°C23/34°C
23rd Jul 2025435 AMAQI
23rd Jul 2025466 AMAQI
23rd Jul 2025477 AMAQI
23rd Jul 2025478 AMAQI
23rd Jul 2025509 AMAQI
23rd Jul 20255310 AMAQI
23rd Jul 20255511 AMAQI
23rd Jul 20255512 PMAQI
23rd Jul 2025541 PMAQI
23rd Jul 2025522 PMAQI
23rd Jul 2025523 PMAQI
23rd Jul 2025534 PMAQI
23rd Jul 2025545 PMAQI
23rd Jul 2025536 PMAQI
23rd Jul 2025557 PMAQI
23rd Jul 2025548 PMAQI
23rd Jul 2025559 PMAQI
23rd Jul 20255410 PMAQI
23rd Jul 20255611 PMAQI
24th Jul 20255512 AMAQI
24th Jul 2025541 AMAQI
24th Jul 2025532 AMAQI
24th Jul 2025543 AMAQI
24th Jul 2025534 AMAQI
30°C25/36°C
24th Jul 2025545 AMAQI
24th Jul 2025556 AMAQI
24th Jul 2025547 AMAQI
24th Jul 2025548 AMAQI
24th Jul 2025549 AMAQI
24th Jul 20255410 AMAQI
24th Jul 20255511 AMAQI
24th Jul 20255612 PMAQI
24th Jul 2025551 PMAQI
24th Jul 2025542 PMAQI
24th Jul 2025553 PMAQI
24th Jul 2025554 PMAQI
24th Jul 2025545 PMAQI
24th Jul 2025546 PMAQI
24th Jul 2025567 PMAQI
24th Jul 2025558 PMAQI
24th Jul 2025549 PMAQI
24th Jul 20255510 PMAQI
24th Jul 20255511 PMAQI
25th Jul 20255512 AMAQI
25th Jul 2025561 AMAQI
25th Jul 2025552 AMAQI
25th Jul 2025543 AMAQI
25th Jul 2025544 AMAQI
30°C25/37°C
25th Jul 2025545 AMAQI
25th Jul 2025536 AMAQI
25th Jul 2025537 AMAQI
25th Jul 2025538 AMAQI
25th Jul 2025549 AMAQI
25th Jul 20255310 AMAQI
25th Jul 20255411 AMAQI
25th Jul 20255412 PMAQI
25th Jul 2025551 PMAQI
25th Jul 2025552 PMAQI
25th Jul 2025553 PMAQI
25th Jul 2025554 PMAQI
25th Jul 2025545 PMAQI
25th Jul 2025556 PMAQI
25th Jul 2025547 PMAQI
25th Jul 2025548 PMAQI
25th Jul 2025539 PMAQI
25th Jul 20255310 PMAQI
25th Jul 20255411 PMAQI
26th Jul 20255412 AMAQI
26th Jul 2025521 AMAQI
26th Jul 2025502 AMAQI
26th Jul 2025483 AMAQI
26th Jul 2025474 AMAQI
29°C25/35°C
26th Jul 2025475 AMAQI
26th Jul 2025466 AMAQI
26th Jul 2025467 AMAQI
26th Jul 2025458 AMAQI
26th Jul 2025439 AMAQI
26th Jul 20254210 AMAQI
26th Jul 20254011 AMAQI
26th Jul 20253812 PMAQI
26th Jul 2025381 PMAQI
26th Jul 2025412 PMAQI
26th Jul 2025493 PMAQI
26th Jul 2025444 PMAQI
26th Jul 2025425 PMAQI
26th Jul 2025416 PMAQI
26th Jul 2025447 PMAQI
26th Jul 2025458 PMAQI
26th Jul 2025399 PMAQI
26th Jul 20253810 PMAQI
26th Jul 20253711 PMAQI
27th Jul 20253912 AMAQI
27th Jul 2025381 AMAQI
27th Jul 2025262 AMAQI
27th Jul 2025253 AMAQI
27th Jul 2025284 AMAQI
29°C25/35°C
27th Jul 2025315 AMAQI
27th Jul 2025296 AMAQI
27th Jul 2025277 AMAQI
27th Jul 2025268 AMAQI
27th Jul 2025269 AMAQI
27th Jul 20252710 AMAQI
27th Jul 20252811 AMAQI
27th Jul 20253012 PMAQI
27th Jul 2025311 PMAQI
27th Jul 2025322 PMAQI
27th Jul 2025323 PMAQI
27th Jul 2025314 PMAQI
27th Jul 2025315 PMAQI
27th Jul 2025326 PMAQI
27th Jul 2025307 PMAQI
27th Jul 2025308 PMAQI
27th Jul 2025319 PMAQI
27th Jul 20253110 PMAQI
27th Jul 20253211 PMAQI
28th Jul 20253212 AMAQI
28th Jul 2025321 AMAQI
28th Jul 2025322 AMAQI
28th Jul 2025313 AMAQI
28th Jul 2025304 AMAQI
29°C24/33°C
28th Jul 2025305 AMAQI
28th Jul 2025326 AMAQI
28th Jul 2025337 AMAQI
28th Jul 2025348 AMAQI
28th Jul 2025349 AMAQI
28th Jul 20253710 AMAQI
28th Jul 20253811 AMAQI
28th Jul 20254012 PMAQI
28th Jul 2025401 PMAQI
28th Jul 2025422 PMAQI
28th Jul 2025413 PMAQI
28th Jul 2025424 PMAQI
28th Jul 2025425 PMAQI
28th Jul 2025426 PMAQI
28th Jul 2025387 PMAQI
28th Jul 2025368 PMAQI
28th Jul 2025379 PMAQI
28th Jul 20253910 PMAQI
28th Jul 20254011 PMAQI
29th Jul 20254212 AMAQI
29th Jul 2025431 AMAQI
29th Jul 2025452 AMAQI
29th Jul 2025473 AMAQI
29th Jul 2025474 AMAQI
31°C25/37°C
29th Jul 2025475 AMAQI
29th Jul 2025506 AMAQI
29th Jul 2025507 AMAQI
29th Jul 2025498 AMAQI
29th Jul 2025499 AMAQI
29th Jul 20254410 AMAQI
29th Jul 20254111 AMAQI
29th Jul 20254012 PMAQI
29th Jul 2025401 PMAQI
29th Jul 2025422 PMAQI
29th Jul 2025453 PMAQI
29th Jul 2025464 PMAQI
29th Jul 2025465 PMAQI
29th Jul 2025466 PMAQI
29th Jul 2025467 PMAQI
29th Jul 2025488 PMAQI
29th Jul 2025449 PMAQI
29th Jul 20254410 PMAQI
29th Jul 20254511 PMAQI
30th Jul 20254512 AMAQI
30th Jul 2025451 AMAQI
30th Jul 2025402 AMAQI
30th Jul 2025423 AMAQI
30th Jul 2025444 AMAQI
30°C25/36°C
30th Jul 2025455 AMAQI
30th Jul 2025486 AMAQI
30th Jul 2025497 AMAQI
30th Jul 2025518 AMAQI
30th Jul 2025489 AMAQI
30th Jul 20254810 AMAQI
30th Jul 20254811 AMAQI
30th Jul 20254812 PMAQI
30th Jul 2025491 PMAQI
30th Jul 2025482 PMAQI
30th Jul 2025483 PMAQI
30th Jul 2025484 PMAQI
30th Jul 2025485 PMAQI
30th Jul 2025486 PMAQI
30th Jul 2025487 PMAQI
30th Jul 2025488 PMAQI
30th Jul 2025479 PMAQI
30th Jul 20254810 PMAQI
30th Jul 20254611 PMAQI
31st Jul 20254412 AMAQI
31st Jul 2025421 AMAQI
31st Jul 2025332 AMAQI
31st Jul 2025323 AMAQI
31st Jul 2025324 AMAQI
29°C23/36°C
31st Jul 2025295 AMAQI
31st Jul 2025316 AMAQI
31st Jul 2025347 AMAQI
31st Jul 2025358 AMAQI
31st Jul 2025379 AMAQI
31st Jul 20253710 AMAQI
31st Jul 20253511 AMAQI
31st Jul 20253312 PMAQI
31st Jul 2025301 PMAQI
31st Jul 2025322 PMAQI
31st Jul 2025323 PMAQI
31st Jul 2025344 PMAQI
31st Jul 2025385 PMAQI
31st Jul 2025476 PMAQI
31st Jul 2025357 PMAQI
31st Jul 2025438 PMAQI
31st Jul 2025509 PMAQI
31st Jul 20255410 PMAQI
31st Jul 20255811 PMAQI
1st Aug 20256412 AMAQI
1st Aug 2025701 AMAQI
1st Aug 2025722 AMAQI
1st Aug 2025763 AMAQI
1st Aug 2025844 AMAQI
26°C23/29°C
1st Aug 2025945 AMAQI
1st Aug 20251026 AMAQI
1st Aug 20251047 AMAQI
1st Aug 20251108 AMAQI
1st Aug 20251119 AMAQI
1st Aug 202510610 AMAQI
1st Aug 202510411 AMAQI
1st Aug 20259612 PMAQI
1st Aug 2025911 PMAQI
1st Aug 2025862 PMAQI
1st Aug 2025853 PMAQI
1st Aug 2025854 PMAQI
1st Aug 2025885 PMAQI
1st Aug 2025866 PMAQI
1st Aug 2025927 PMAQI
1st Aug 2025918 PMAQI
1st Aug 2025889 PMAQI
1st Aug 20259110 PMAQI
1st Aug 20259211 PMAQI
2nd Aug 20259012 AMAQI
2nd Aug 2025931 AMAQI
2nd Aug 2025942 AMAQI
2nd Aug 2025933 AMAQI
2nd Aug 2025944 AMAQI
23°C18/29°C
2nd Aug 2025925 AMAQI
2nd Aug 2025926 AMAQI
2nd Aug 2025927 AMAQI
2nd Aug 2025948 AMAQI
2nd Aug 2025939 AMAQI
2nd Aug 20258510 AMAQI
2nd Aug 20258411 AMAQI
2nd Aug 20257612 PMAQI
2nd Aug 2025691 PMAQI
2nd Aug 2025662 PMAQI
2nd Aug 2025663 PMAQI
2nd Aug 2025624 PMAQI
2nd Aug 2025595 PMAQI
2nd Aug 2025586 PMAQI
2nd Aug 2025807 PMAQI
2nd Aug 2025758 PMAQI
2nd Aug 2025549 PMAQI
2nd Aug 20255410 PMAQI
2nd Aug 20255611 PMAQI
3rd Aug 20255412 AMAQI
3rd Aug 2025551 AMAQI
3rd Aug 2025562 AMAQI
3rd Aug 2025563 AMAQI
3rd Aug 2025544 AMAQI
21°C14/26°C
3rd Aug 2025545 AMAQI
3rd Aug 2025536 AMAQI
3rd Aug 2025527 AMAQI
3rd Aug 2025528 AMAQI
3rd Aug 2025519 AMAQI
3rd Aug 20254910 AMAQI
3rd Aug 20255011 AMAQI
3rd Aug 20254812 PMAQI
3rd Aug 2025481 PMAQI
3rd Aug 2025502 PMAQI
3rd Aug 2025513 PMAQI
3rd Aug 2025514 PMAQI
3rd Aug 2025505 PMAQI
3rd Aug 2025506 PMAQI
3rd Aug 2025517 PMAQI
3rd Aug 2025488 PMAQI
3rd Aug 2025449 PMAQI
3rd Aug 20254610 PMAQI
3rd Aug 20254311 PMAQI
4th Aug 20254312 AMAQI
4th Aug 2025441 AMAQI
4th Aug 2025422 AMAQI
4th Aug 2025383 AMAQI
4th Aug 2025364 AMAQI
22°C13/29°C
4th Aug 2025385 AMAQI
4th Aug 2025376 AMAQI
4th Aug 2025367 AMAQI
4th Aug 2025368 AMAQI
4th Aug 2025389 AMAQI
4th Aug 20253810 AMAQI
4th Aug 20253711 AMAQI
4th Aug 20254012 PMAQI
4th Aug 2025411 PMAQI
4th Aug 2025412 PMAQI
4th Aug 2025423 PMAQI
4th Aug 2025414 PMAQI
4th Aug 2025415 PMAQI
4th Aug 2025406 PMAQI
4th Aug 2025407 PMAQI
4th Aug 2025338 PMAQI
4th Aug 2025319 PMAQI
4th Aug 20253010 PMAQI
4th Aug 20253011 PMAQI
5th Aug 20252912 AMAQI
5th Aug 2025311 AMAQI
5th Aug 2025332 AMAQI
5th Aug 2025333 AMAQI
5th Aug 2025334 AMAQI
22°C16/29°C
5th Aug 2025375 AMAQI
5th Aug 2025386 AMAQI
5th Aug 2025407 AMAQI
5th Aug 2025388 AMAQI
5th Aug 2025359 AMAQI
5th Aug 20254010 AMAQI
5th Aug 20254811 AMAQI
5th Aug 20255212 PMAQI
5th Aug 2025541 PMAQI
5th Aug 2025522 PMAQI
5th Aug 2025513 PMAQI
5th Aug 2025504 PMAQI
5th Aug 2025495 PMAQI
5th Aug 2025446 PMAQI
5th Aug 2025387 PMAQI
5th Aug 2025428 PMAQI
5th Aug 2025399 PMAQI
5th Aug 20253910 PMAQI
5th Aug 20253811 PMAQI
6th Aug 20254012 AMAQI
6th Aug 2025391 AMAQI
6th Aug 2025402 AMAQI
6th Aug 2025383 AMAQI
6th Aug 2025404 AMAQI
24°C19/31°C
6th Aug 2025405 AMAQI
6th Aug 2025406 AMAQI
6th Aug 2025417 AMAQI
6th Aug 2025438 AMAQI
6th Aug 2025429 AMAQI
6th Aug 20254410 AMAQI
6th Aug 20254811 AMAQI
6th Aug 20255112 PMAQI
6th Aug 2025491 PMAQI
6th Aug 2025502 PMAQI
6th Aug 2025523 PMAQI
6th Aug 2025524 PMAQI
6th Aug 2025515 PMAQI
6th Aug 2025536 PMAQI
6th Aug 2025427 PMAQI
6th Aug 2025488 PMAQI
6th Aug 2025529 PMAQI
6th Aug 20255210 PMAQI
6th Aug 20255311 PMAQI
7th Aug 20255212 AMAQI
7th Aug 2025461 AMAQI
7th Aug 2025492 AMAQI
7th Aug 2025483 AMAQI
7th Aug 2025454 AMAQI
26°C17/33°C
7th Aug 2025485 AMAQI
7th Aug 2025506 AMAQI
7th Aug 2025507 AMAQI
7th Aug 2025518 AMAQI
7th Aug 2025529 AMAQI
7th Aug 20255110 AMAQI
7th Aug 20255011 AMAQI
7th Aug 20255012 PMAQI
7th Aug 2025501 PMAQI
7th Aug 2025522 PMAQI
7th Aug 2025523 PMAQI
7th Aug 2025524 PMAQI
7th Aug 2025525 PMAQI
7th Aug 2025526 PMAQI
7th Aug 2025527 PMAQI
7th Aug 2025528 PMAQI
7th Aug 2025529 PMAQI
7th Aug 20255210 PMAQI
7th Aug 20255211 PMAQI
8th Aug 20255212 AMAQI
8th Aug 2025511 AMAQI
8th Aug 2025522 AMAQI
8th Aug 2025513 AMAQI
8th Aug 2025504 AMAQI
27°C21/35°C
8th Aug 2025515 AMAQI
8th Aug 2025526 AMAQI
8th Aug 2025527 AMAQI
8th Aug 2025528 AMAQI
8th Aug 2025529 AMAQI
8th Aug 20255410 AMAQI
8th Aug 20255311 AMAQI
8th Aug 20255212 PMAQI
8th Aug 2025521 PMAQI
8th Aug 2025522 PMAQI
8th Aug 2025523 PMAQI
8th Aug 2025534 PMAQI
8th Aug 2025525 PMAQI
8th Aug 2025526 PMAQI
8th Aug 2025527 PMAQI
8th Aug 2025528 PMAQI
8th Aug 2025539 PMAQI
8th Aug 20255310 PMAQI
8th Aug 20255311 PMAQI
9th Aug 20255412 AMAQI
9th Aug 2025521 AMAQI
9th Aug 2025512 AMAQI
9th Aug 2025503 AMAQI
9th Aug 2025484 AMAQI
29°C23/35°C
9th Aug 2025455 AMAQI
9th Aug 2025486 AMAQI
9th Aug 2025487 AMAQI
9th Aug 2025468 AMAQI
9th Aug 2025469 AMAQI
9th Aug 20254610 AMAQI
9th Aug 20254711 AMAQI
9th Aug 20254712 PMAQI
9th Aug 2025481 PMAQI
9th Aug 2025482 PMAQI
9th Aug 2025493 PMAQI
9th Aug 2025494 PMAQI
9th Aug 2025495 PMAQI
9th Aug 2025506 PMAQI
9th Aug 2025507 PMAQI
9th Aug 2025508 PMAQI
9th Aug 2025519 PMAQI
9th Aug 20255110 PMAQI
9th Aug 20255111 PMAQI
10th Aug 20255212 AMAQI
10th Aug 2025511 AMAQI
10th Aug 2025482 AMAQI
10th Aug 2025473 AMAQI
10th Aug 2025454 AMAQI
28°C22/35°C
10th Aug 2025455 AMAQI
5 AM10th Aug 2025486 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
44AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
44AQI
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. 44), while the lowest AQI was between 12 AM to 11 PM (Avg. 44).
2025 Days Vs Air Quality
Houston, Chester, Illinois, United States
2025
85%
186
15%
33
0.4%
1
Total number of days with different AQI categories in last 222 days in 2025 (143 days remaining)
Good
186 DaysModerate
33 DaysPoor
1 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2025, 85% of 222 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
Houston, 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.
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
27AQI
29AQI
37AQI
33AQI
28AQI
47AQI
42AQI
55AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202536AQI
29
2
28
27
3
1
29
1
29
2
16
14
24
7
4
4
186
33
1
Highest AQI recorded in
August55AQI
Lowest AQI recorded in
January27AQI
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.)
31AQIHouston's annual 2025 AQI (36) shows an average percentage change of -1.5% (improved AQI) compared to previous years: 2020 (40), 2021 (38), 2022 (36), 2023 (38), 2024 (31).
