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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+

October Air Quality Analysis

Houston, Chester, Illinois, United States

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
29th Oct 2024
77AQI
Lowest AQI recorded on
14th Oct 2023
14AQI

Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 51 of Moderate air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 3rd Oct - 4th Oct 2025

Houston, Chester, Illinois, United States

AQI
Day
Night
.

6 AM3rd Oct 2025

7 PM

5 AM4th Oct 2025

Day time
Avg. Highest Time
10AM3rd Oct

68AQI

Avg. Lowest Time
6AM3rd Oct

34AQI

Night time
Avg. Highest Time
1AM4th Oct

81AQI

Avg. Lowest Time
7PM3rd Oct

54AQI

In the last 24 hours,

Houston's AQI reached its highest point of 81 at 1 AM during the Night, while the lowest point, 34, was recorded at 6 AM during the Day between 3rd Oct and 4th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Houston, Chester, Illinois, United States

SepOct
04th - 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 - 01st01st - 02nd02nd - 03rd03rd - 04th04th
Day
Night
4th Sep 2025696 AMAQI
4th Sep 2025687 AMAQI
4th Sep 2025678 AMAQI
4th Sep 2025659 AMAQI
4th Sep 20256610 AMAQI
4th Sep 20256511 AMAQI
4th Sep 20256412 PMAQI
4th Sep 2025641 PMAQI
4th Sep 2025632 PMAQI
4th Sep 2025623 PMAQI
4th Sep 2025624 PMAQI
4th Sep 2025615 PMAQI
4th Sep 2025606 PMAQI
4th Sep 2025587 PMAQI
4th Sep 2025588 PMAQI
4th Sep 2025589 PMAQI
4th Sep 20255710 PMAQI
4th Sep 20256011 PMAQI
5th Sep 20256012 AMAQI
5th Sep 2025591 AMAQI
5th Sep 2025582 AMAQI
5th Sep 2025593 AMAQI
5th Sep 2025584 AMAQI
5th Sep 2025605 AMAQI

20°C15/26°C

5th Sep 2025616 AMAQI
5th Sep 2025627 AMAQI
5th Sep 2025648 AMAQI
5th Sep 2025639 AMAQI
5th Sep 20256310 AMAQI
5th Sep 20256211 AMAQI
5th Sep 20256112 PMAQI
5th Sep 2025581 PMAQI
5th Sep 2025562 PMAQI
5th Sep 2025563 PMAQI
5th Sep 2025544 PMAQI
5th Sep 2025535 PMAQI
5th Sep 2025536 PMAQI
5th Sep 2025617 PMAQI
5th Sep 2025538 PMAQI
5th Sep 2025529 PMAQI
5th Sep 20255010 PMAQI
5th Sep 20254811 PMAQI
6th Sep 20254512 AMAQI
6th Sep 2025471 AMAQI
6th Sep 2025412 AMAQI
6th Sep 2025413 AMAQI
6th Sep 2025394 AMAQI
6th Sep 2025385 AMAQI

20°C15/26°C

6th Sep 2025376 AMAQI
6th Sep 2025367 AMAQI
6th Sep 2025358 AMAQI
6th Sep 2025369 AMAQI
6th Sep 20253710 AMAQI
6th Sep 20253311 AMAQI
6th Sep 20252812 PMAQI
6th Sep 2025251 PMAQI
6th Sep 2025222 PMAQI
6th Sep 2025223 PMAQI
6th Sep 2025214 PMAQI
6th Sep 2025225 PMAQI
6th Sep 2025206 PMAQI
6th Sep 2025327 PMAQI
6th Sep 2025318 PMAQI
6th Sep 2025269 PMAQI
6th Sep 20252710 PMAQI
6th Sep 20253011 PMAQI
7th Sep 20253012 AMAQI
7th Sep 2025291 AMAQI
7th Sep 2025292 AMAQI
7th Sep 2025283 AMAQI
7th Sep 2025294 AMAQI
7th Sep 2025295 AMAQI

19°C14/27°C

7th Sep 2025286 AMAQI
7th Sep 2025287 AMAQI
7th Sep 2025278 AMAQI
7th Sep 2025279 AMAQI
7th Sep 20252410 AMAQI
7th Sep 20252411 AMAQI
7th Sep 20252412 PMAQI
7th Sep 2025241 PMAQI
7th Sep 2025262 PMAQI
7th Sep 2025263 PMAQI
7th Sep 2025224 PMAQI
7th Sep 2025225 PMAQI
7th Sep 2025226 PMAQI
7th Sep 2025247 PMAQI
7th Sep 2025238 PMAQI
7th Sep 2025249 PMAQI
7th Sep 20252410 PMAQI
7th Sep 20252611 PMAQI
8th Sep 20252712 AMAQI
8th Sep 2025281 AMAQI
8th Sep 2025292 AMAQI
8th Sep 2025293 AMAQI
8th Sep 2025284 AMAQI
8th Sep 2025265 AMAQI

17°C10/25°C

8th Sep 2025256 AMAQI
8th Sep 2025257 AMAQI
8th Sep 2025288 AMAQI
8th Sep 2025279 AMAQI
8th Sep 20252610 AMAQI
8th Sep 20252511 AMAQI
8th Sep 20252212 PMAQI
8th Sep 2025221 PMAQI
8th Sep 2025222 PMAQI
8th Sep 2025213 PMAQI
8th Sep 2025194 PMAQI
8th Sep 2025215 PMAQI
8th Sep 2025216 PMAQI
8th Sep 2025247 PMAQI
8th Sep 2025248 PMAQI
8th Sep 2025259 PMAQI
8th Sep 20253010 PMAQI
8th Sep 20252311 PMAQI
9th Sep 20252612 AMAQI
9th Sep 2025251 AMAQI
9th Sep 2025232 AMAQI
9th Sep 2025243 AMAQI
9th Sep 2025264 AMAQI
9th Sep 2025295 AMAQI

16°C3/26°C

9th Sep 2025346 AMAQI
9th Sep 2025317 AMAQI
9th Sep 2025378 AMAQI
9th Sep 2025439 AMAQI
9th Sep 20253910 AMAQI
9th Sep 20253611 AMAQI
9th Sep 20253512 PMAQI
9th Sep 2025401 PMAQI
9th Sep 2025372 PMAQI
9th Sep 2025413 PMAQI
9th Sep 2025434 PMAQI
9th Sep 2025455 PMAQI
9th Sep 2025526 PMAQI
9th Sep 2025327 PMAQI
9th Sep 2025328 PMAQI
9th Sep 2025359 PMAQI
9th Sep 20253610 PMAQI
9th Sep 20253911 PMAQI
10th Sep 20254312 AMAQI
10th Sep 2025441 AMAQI
10th Sep 2025432 AMAQI
10th Sep 2025413 AMAQI
10th Sep 2025404 AMAQI
10th Sep 2025395 AMAQI

19°C7/29°C

10th Sep 2025406 AMAQI
10th Sep 2025487 AMAQI
10th Sep 2025518 AMAQI
10th Sep 2025539 AMAQI
10th Sep 20255310 AMAQI
10th Sep 20255511 AMAQI
10th Sep 20255512 PMAQI
10th Sep 2025551 PMAQI
10th Sep 2025552 PMAQI
10th Sep 2025543 PMAQI
10th Sep 2025524 PMAQI
10th Sep 2025525 PMAQI
10th Sep 2025526 PMAQI
10th Sep 2025437 PMAQI
10th Sep 2025488 PMAQI
10th Sep 2025539 PMAQI
10th Sep 20255410 PMAQI
10th Sep 20255411 PMAQI
11th Sep 20255312 AMAQI
11th Sep 2025531 AMAQI
11th Sep 2025542 AMAQI
11th Sep 2025533 AMAQI
11th Sep 2025544 AMAQI
11th Sep 2025535 AMAQI

24°C15/33°C

11th Sep 2025536 AMAQI
11th Sep 2025547 AMAQI
11th Sep 2025538 AMAQI
11th Sep 2025549 AMAQI
11th Sep 20255710 AMAQI
11th Sep 20255911 AMAQI
11th Sep 20256012 PMAQI
11th Sep 2025561 PMAQI
11th Sep 2025562 PMAQI
11th Sep 2025573 PMAQI
11th Sep 2025574 PMAQI
11th Sep 2025585 PMAQI
11th Sep 2025586 PMAQI
11th Sep 2025547 PMAQI
11th Sep 2025558 PMAQI
11th Sep 2025589 PMAQI
11th Sep 20255810 PMAQI
11th Sep 20255811 PMAQI
12th Sep 20255812 AMAQI
12th Sep 2025581 AMAQI
12th Sep 2025582 AMAQI
12th Sep 2025583 AMAQI
12th Sep 2025594 AMAQI
12th Sep 2025585 AMAQI

25°C15/34°C

12th Sep 2025576 AMAQI
12th Sep 2025587 AMAQI
12th Sep 2025568 AMAQI
12th Sep 2025579 AMAQI
12th Sep 20256110 AMAQI
12th Sep 20256311 AMAQI
12th Sep 20256212 PMAQI
12th Sep 2025621 PMAQI
12th Sep 2025622 PMAQI
12th Sep 2025623 PMAQI
12th Sep 2025604 PMAQI
12th Sep 2025605 PMAQI
12th Sep 2025606 PMAQI
12th Sep 2025597 PMAQI
12th Sep 2025598 PMAQI
12th Sep 2025599 PMAQI
12th Sep 20255810 PMAQI
12th Sep 20255911 PMAQI
13th Sep 20255912 AMAQI
13th Sep 2025611 AMAQI
13th Sep 2025592 AMAQI
13th Sep 2025593 AMAQI
13th Sep 2025584 AMAQI
13th Sep 2025595 AMAQI

26°C16/35°C

13th Sep 2025596 AMAQI
13th Sep 2025587 AMAQI
13th Sep 2025608 AMAQI
13th Sep 2025629 AMAQI
13th Sep 20256210 AMAQI
13th Sep 20256211 AMAQI
13th Sep 20256212 PMAQI
13th Sep 2025611 PMAQI
13th Sep 2025612 PMAQI
13th Sep 2025603 PMAQI
13th Sep 2025614 PMAQI
13th Sep 2025605 PMAQI
13th Sep 2025606 PMAQI
13th Sep 2025617 PMAQI
13th Sep 2025608 PMAQI
13th Sep 2025599 PMAQI
13th Sep 20255910 PMAQI
13th Sep 20255811 PMAQI
14th Sep 20256012 AMAQI
14th Sep 2025581 AMAQI
14th Sep 2025572 AMAQI
14th Sep 2025583 AMAQI
14th Sep 2025584 AMAQI
14th Sep 2025585 AMAQI

28°C17/37°C

14th Sep 2025576 AMAQI
14th Sep 2025567 AMAQI
14th Sep 2025588 AMAQI
14th Sep 2025589 AMAQI
14th Sep 20255810 AMAQI
14th Sep 20255811 AMAQI
14th Sep 20255812 PMAQI
14th Sep 2025581 PMAQI
14th Sep 2025582 PMAQI
14th Sep 2025583 PMAQI
14th Sep 2025584 PMAQI
14th Sep 2025585 PMAQI
14th Sep 2025586 PMAQI
14th Sep 2025587 PMAQI
14th Sep 2025578 PMAQI
14th Sep 2025569 PMAQI
14th Sep 20255510 PMAQI
14th Sep 20255411 PMAQI
15th Sep 20255412 AMAQI
15th Sep 2025531 AMAQI
15th Sep 2025502 AMAQI
15th Sep 2025493 AMAQI
15th Sep 2025524 AMAQI
15th Sep 2025525 AMAQI

29°C21/38°C

15th Sep 2025486 AMAQI
15th Sep 2025507 AMAQI
15th Sep 2025408 AMAQI
15th Sep 2025589 AMAQI
15th Sep 20255810 AMAQI
15th Sep 20255911 AMAQI
15th Sep 20256012 PMAQI
15th Sep 2025601 PMAQI
15th Sep 2025602 PMAQI
15th Sep 2025583 PMAQI
15th Sep 2025584 PMAQI
15th Sep 2025585 PMAQI
15th Sep 2025586 PMAQI
15th Sep 2025567 PMAQI
15th Sep 2025578 PMAQI
15th Sep 2025579 PMAQI
15th Sep 20255810 PMAQI
15th Sep 20255811 PMAQI
16th Sep 20255912 AMAQI
16th Sep 2025601 AMAQI
16th Sep 2025592 AMAQI
16th Sep 2025593 AMAQI
16th Sep 2025594 AMAQI
16th Sep 2025585 AMAQI

27°C19/35°C

16th Sep 2025596 AMAQI
16th Sep 2025587 AMAQI
16th Sep 2025588 AMAQI
16th Sep 2025589 AMAQI
16th Sep 20256010 AMAQI
16th Sep 20255811 AMAQI
16th Sep 20255912 PMAQI
16th Sep 2025581 PMAQI
16th Sep 2025582 PMAQI
16th Sep 2025593 PMAQI
16th Sep 2025584 PMAQI
16th Sep 2025585 PMAQI
16th Sep 2025586 PMAQI
16th Sep 2025597 PMAQI
16th Sep 2025588 PMAQI
16th Sep 2025589 PMAQI
16th Sep 20255910 PMAQI
16th Sep 20255811 PMAQI
17th Sep 20255812 AMAQI
17th Sep 2025561 AMAQI
17th Sep 2025572 AMAQI
17th Sep 2025563 AMAQI
17th Sep 2025564 AMAQI
17th Sep 2025565 AMAQI

26°C17/35°C

17th Sep 2025566 AMAQI
17th Sep 2025567 AMAQI
17th Sep 2025568 AMAQI
17th Sep 2025569 AMAQI
17th Sep 20255710 AMAQI
17th Sep 20255811 AMAQI
17th Sep 20255812 PMAQI
17th Sep 2025571 PMAQI
17th Sep 2025572 PMAQI
17th Sep 2025573 PMAQI
17th Sep 2025574 PMAQI
17th Sep 2025575 PMAQI
17th Sep 2025566 PMAQI
17th Sep 2025577 PMAQI
17th Sep 2025578 PMAQI
17th Sep 2025569 PMAQI
17th Sep 20255710 PMAQI
17th Sep 20255711 PMAQI
18th Sep 20255612 AMAQI
18th Sep 2025561 AMAQI
18th Sep 2025522 AMAQI
18th Sep 2025523 AMAQI
18th Sep 2025524 AMAQI
18th Sep 2025525 AMAQI

25°C16/35°C

18th Sep 2025546 AMAQI
18th Sep 2025547 AMAQI
18th Sep 2025548 AMAQI
18th Sep 2025569 AMAQI
18th Sep 20255610 AMAQI
18th Sep 20255711 AMAQI
18th Sep 20255612 PMAQI
18th Sep 2025571 PMAQI
18th Sep 2025582 PMAQI
18th Sep 2025583 PMAQI
18th Sep 2025584 PMAQI
18th Sep 2025575 PMAQI
18th Sep 2025576 PMAQI
18th Sep 2025577 PMAQI
18th Sep 2025588 PMAQI
18th Sep 2025579 PMAQI
18th Sep 20255810 PMAQI
18th Sep 20256011 PMAQI
19th Sep 20255812 AMAQI
19th Sep 2025561 AMAQI
19th Sep 2025462 AMAQI
19th Sep 2025423 AMAQI
19th Sep 2025374 AMAQI
19th Sep 2025345 AMAQI

25°C13/36°C

19th Sep 2025366 AMAQI
19th Sep 2025397 AMAQI
19th Sep 2025398 AMAQI
19th Sep 2025409 AMAQI
19th Sep 20254010 AMAQI
19th Sep 20254311 AMAQI
19th Sep 20254112 PMAQI
19th Sep 2025441 PMAQI
19th Sep 2025452 PMAQI
19th Sep 2025493 PMAQI
19th Sep 2025504 PMAQI
19th Sep 2025515 PMAQI
19th Sep 2025516 PMAQI
19th Sep 2025507 PMAQI
19th Sep 2025498 PMAQI
19th Sep 2025519 PMAQI
19th Sep 20255210 PMAQI
19th Sep 20255111 PMAQI
20th Sep 20255212 AMAQI
20th Sep 2025521 AMAQI
20th Sep 2025502 AMAQI
20th Sep 2025463 AMAQI
20th Sep 2025444 AMAQI
20th Sep 2025475 AMAQI

24°C18/33°C

20th Sep 2025486 AMAQI
20th Sep 2025467 AMAQI
20th Sep 2025488 AMAQI
20th Sep 2025519 AMAQI
20th Sep 20255210 AMAQI
20th Sep 20255311 AMAQI
20th Sep 20255412 PMAQI
20th Sep 2025551 PMAQI
20th Sep 2025562 PMAQI
20th Sep 2025553 PMAQI
20th Sep 2025544 PMAQI
20th Sep 2025545 PMAQI
20th Sep 2025536 PMAQI
20th Sep 2025537 PMAQI
20th Sep 2025538 PMAQI
20th Sep 2025529 PMAQI
20th Sep 20255410 PMAQI
20th Sep 20255311 PMAQI
21st Sep 20255412 AMAQI
21st Sep 2025531 AMAQI
21st Sep 2025522 AMAQI
21st Sep 2025533 AMAQI
21st Sep 2025524 AMAQI
21st Sep 2025515 AMAQI

23°C19/29°C

21st Sep 2025516 AMAQI
21st Sep 2025517 AMAQI
21st Sep 2025508 AMAQI
21st Sep 2025489 AMAQI
21st Sep 20254710 AMAQI
21st Sep 20254811 AMAQI
21st Sep 20254212 PMAQI
21st Sep 2025421 PMAQI
21st Sep 2025442 PMAQI
21st Sep 2025473 PMAQI
21st Sep 2025464 PMAQI
21st Sep 2025455 PMAQI
21st Sep 2025456 PMAQI
21st Sep 2025507 PMAQI
21st Sep 2025508 PMAQI
21st Sep 2025449 PMAQI
21st Sep 20254210 PMAQI
21st Sep 20254311 PMAQI
22nd Sep 20254412 AMAQI
22nd Sep 2025481 AMAQI
22nd Sep 2025292 AMAQI
22nd Sep 2025343 AMAQI
22nd Sep 2025354 AMAQI
22nd Sep 2025385 AMAQI

24°C19/33°C

22nd Sep 2025396 AMAQI
22nd Sep 2025357 AMAQI
22nd Sep 2025358 AMAQI
22nd Sep 2025369 AMAQI
22nd Sep 20253710 AMAQI
22nd Sep 20253411 AMAQI
22nd Sep 20253312 PMAQI
22nd Sep 2025351 PMAQI
22nd Sep 2025372 PMAQI
22nd Sep 2025393 PMAQI
22nd Sep 2025404 PMAQI
22nd Sep 2025405 PMAQI
22nd Sep 2025396 PMAQI
22nd Sep 2025377 PMAQI
22nd Sep 2025378 PMAQI
22nd Sep 2025389 PMAQI
22nd Sep 20253810 PMAQI
22nd Sep 20254011 PMAQI
23rd Sep 20253912 AMAQI
23rd Sep 2025401 AMAQI
23rd Sep 2025442 AMAQI
23rd Sep 2025453 AMAQI
23rd Sep 2025524 AMAQI
23rd Sep 2025505 AMAQI

22°C19/27°C

23rd Sep 2025476 AMAQI
23rd Sep 2025487 AMAQI
23rd Sep 2025458 AMAQI
23rd Sep 2025429 AMAQI
23rd Sep 20254210 AMAQI
23rd Sep 20253911 AMAQI
23rd Sep 20254112 PMAQI
23rd Sep 2025421 PMAQI
23rd Sep 2025452 PMAQI
23rd Sep 2025463 PMAQI
23rd Sep 2025464 PMAQI
23rd Sep 2025455 PMAQI
23rd Sep 2025456 PMAQI
23rd Sep 2025447 PMAQI
23rd Sep 2025438 PMAQI
23rd Sep 2025429 PMAQI
23rd Sep 20254210 PMAQI
23rd Sep 20254111 PMAQI
24th Sep 20254412 AMAQI
24th Sep 2025431 AMAQI
24th Sep 2025422 AMAQI
24th Sep 2025403 AMAQI
24th Sep 2025334 AMAQI
24th Sep 2025335 AMAQI

23°C20/28°C

24th Sep 2025366 AMAQI
24th Sep 2025387 AMAQI
24th Sep 2025368 AMAQI
24th Sep 2025369 AMAQI
24th Sep 20253610 AMAQI
24th Sep 20253411 AMAQI
24th Sep 20252912 PMAQI
24th Sep 2025281 PMAQI
24th Sep 2025362 PMAQI
24th Sep 2025403 PMAQI
24th Sep 2025414 PMAQI
24th Sep 2025385 PMAQI
24th Sep 2025366 PMAQI
24th Sep 2025357 PMAQI
24th Sep 2025368 PMAQI
24th Sep 2025379 PMAQI
24th Sep 20254010 PMAQI
24th Sep 20253911 PMAQI
25th Sep 20254012 AMAQI
25th Sep 2025401 AMAQI
25th Sep 2025402 AMAQI
25th Sep 2025393 AMAQI
25th Sep 2025344 AMAQI
25th Sep 2025345 AMAQI

22°C21/24°C

25th Sep 2025326 AMAQI
25th Sep 2025337 AMAQI
25th Sep 2025338 AMAQI
25th Sep 2025259 AMAQI
25th Sep 20252210 AMAQI
25th Sep 20252411 AMAQI
25th Sep 20252812 PMAQI
25th Sep 2025301 PMAQI
25th Sep 2025322 PMAQI
25th Sep 2025333 PMAQI
25th Sep 2025354 PMAQI
25th Sep 2025405 PMAQI
25th Sep 2025386 PMAQI
25th Sep 2025387 PMAQI
25th Sep 2025328 PMAQI
25th Sep 2025209 PMAQI
25th Sep 20251710 PMAQI
25th Sep 20252011 PMAQI
26th Sep 20252212 AMAQI
26th Sep 2025201 AMAQI
26th Sep 2025202 AMAQI
26th Sep 2025223 AMAQI
26th Sep 2025224 AMAQI
26th Sep 2025225 AMAQI

21°C18/26°C

26th Sep 2025226 AMAQI
26th Sep 2025227 AMAQI
26th Sep 2025228 AMAQI
26th Sep 2025329 AMAQI
26th Sep 20252710 AMAQI
26th Sep 20252811 AMAQI
26th Sep 20253012 PMAQI
26th Sep 2025361 PMAQI
26th Sep 2025382 PMAQI
26th Sep 2025383 PMAQI
26th Sep 2025394 PMAQI
26th Sep 2025405 PMAQI
26th Sep 2025416 PMAQI
26th Sep 2025377 PMAQI
26th Sep 2025278 PMAQI
26th Sep 2025359 PMAQI
26th Sep 20254510 PMAQI
26th Sep 20253311 PMAQI
27th Sep 20253412 AMAQI
27th Sep 2025371 AMAQI
27th Sep 2025442 AMAQI
27th Sep 2025413 AMAQI
27th Sep 2025424 AMAQI
27th Sep 2025385 AMAQI

20°C13/30°C

27th Sep 2025336 AMAQI
27th Sep 2025327 AMAQI
27th Sep 2025308 AMAQI
27th Sep 2025339 AMAQI
27th Sep 20253710 AMAQI
27th Sep 20254011 AMAQI
27th Sep 20253612 PMAQI
27th Sep 2025251 PMAQI
27th Sep 2025302 PMAQI
27th Sep 2025283 PMAQI
27th Sep 2025284 PMAQI
27th Sep 2025285 PMAQI
27th Sep 2025286 PMAQI
27th Sep 2025307 PMAQI
27th Sep 2025368 PMAQI
27th Sep 2025559 PMAQI
27th Sep 20254810 PMAQI
27th Sep 20254011 PMAQI
28th Sep 20253312 AMAQI
28th Sep 2025331 AMAQI
28th Sep 2025382 AMAQI
28th Sep 2025393 AMAQI
28th Sep 2025394 AMAQI
28th Sep 2025395 AMAQI

22°C13/32°C

28th Sep 2025376 AMAQI
28th Sep 2025337 AMAQI
28th Sep 2025328 AMAQI
28th Sep 2025299 AMAQI
28th Sep 20253010 AMAQI
28th Sep 20253011 AMAQI
28th Sep 20253212 PMAQI
28th Sep 2025321 PMAQI
28th Sep 2025292 PMAQI
28th Sep 2025273 PMAQI
28th Sep 2025284 PMAQI
28th Sep 2025265 PMAQI
28th Sep 2025256 PMAQI
28th Sep 2025317 PMAQI
28th Sep 2025308 PMAQI
28th Sep 2025379 PMAQI
28th Sep 20254510 PMAQI
28th Sep 20254711 PMAQI
29th Sep 20253212 AMAQI
29th Sep 2025281 AMAQI
29th Sep 2025282 AMAQI
29th Sep 2025283 AMAQI
29th Sep 2025284 AMAQI
29th Sep 2025355 AMAQI

23°C14/33°C

29th Sep 2025406 AMAQI
29th Sep 2025417 AMAQI
29th Sep 2025698 AMAQI
29th Sep 2025789 AMAQI
29th Sep 20258510 AMAQI
29th Sep 20259311 AMAQI
29th Sep 20258012 PMAQI
29th Sep 2025921 PMAQI
29th Sep 2025732 PMAQI
29th Sep 2025553 PMAQI
29th Sep 2025454 PMAQI
29th Sep 2025465 PMAQI
29th Sep 2025426 PMAQI
29th Sep 2025477 PMAQI
29th Sep 2025488 PMAQI
29th Sep 2025529 PMAQI
29th Sep 20255410 PMAQI
29th Sep 20256211 PMAQI
30th Sep 20256112 AMAQI
30th Sep 2025641 AMAQI
30th Sep 2025582 AMAQI
30th Sep 2025503 AMAQI
30th Sep 2025454 AMAQI
30th Sep 2025475 AMAQI

23°C14/33°C

30th Sep 2025506 AMAQI
30th Sep 2025587 AMAQI
30th Sep 2025608 AMAQI
30th Sep 2025669 AMAQI
30th Sep 20257210 AMAQI
30th Sep 20258311 AMAQI
30th Sep 20258712 PMAQI
30th Sep 2025791 PMAQI
30th Sep 2025662 PMAQI
30th Sep 2025593 PMAQI
30th Sep 2025554 PMAQI
30th Sep 2025525 PMAQI
30th Sep 2025486 PMAQI
30th Sep 2025407 PMAQI
30th Sep 2025518 PMAQI
30th Sep 2025539 PMAQI
30th Sep 20255410 PMAQI
30th Sep 20255411 PMAQI
1st Oct 20256212 AMAQI
1st Oct 2025631 AMAQI
1st Oct 2025602 AMAQI
1st Oct 2025543 AMAQI
1st Oct 2025514 AMAQI
1st Oct 2025525 AMAQI

24°C16/34°C

1st Oct 2025526 AMAQI
1st Oct 2025507 AMAQI
1st Oct 2025508 AMAQI
1st Oct 2025529 AMAQI
1st Oct 20255710 AMAQI
1st Oct 20256211 AMAQI
1st Oct 20256012 PMAQI
1st Oct 2025561 PMAQI
1st Oct 2025542 PMAQI
1st Oct 2025573 PMAQI
1st Oct 2025584 PMAQI
1st Oct 2025565 PMAQI
1st Oct 2025566 PMAQI
1st Oct 2025557 PMAQI
1st Oct 2025558 PMAQI
1st Oct 2025549 PMAQI
1st Oct 20255610 PMAQI
1st Oct 20255611 PMAQI
2nd Oct 20255712 AMAQI
2nd Oct 2025561 AMAQI
2nd Oct 2025572 AMAQI
2nd Oct 2025683 AMAQI
2nd Oct 2025664 AMAQI
2nd Oct 2025695 AMAQI

24°C15/33°C

2nd Oct 2025576 AMAQI
2nd Oct 2025587 AMAQI
2nd Oct 2025638 AMAQI
2nd Oct 2025719 AMAQI
2nd Oct 20257810 AMAQI
2nd Oct 20257011 AMAQI
2nd Oct 20256712 PMAQI
2nd Oct 2025541 PMAQI
2nd Oct 2025502 PMAQI
2nd Oct 2025583 PMAQI
2nd Oct 2025484 PMAQI
2nd Oct 2025495 PMAQI
2nd Oct 2025396 PMAQI
2nd Oct 2025357 PMAQI
2nd Oct 2025318 PMAQI
2nd Oct 2025329 PMAQI
2nd Oct 20253310 PMAQI
2nd Oct 20253211 PMAQI
3rd Oct 20253912 AMAQI
3rd Oct 2025391 AMAQI
3rd Oct 2025372 AMAQI
3rd Oct 2025353 AMAQI
3rd Oct 2025374 AMAQI
3rd Oct 2025355 AMAQI

24°C17/33°C

3rd Oct 2025346 AMAQI
3rd Oct 2025477 AMAQI
3rd Oct 2025498 AMAQI
3rd Oct 2025489 AMAQI
3rd Oct 20256810 AMAQI
3rd Oct 20256211 AMAQI
3rd Oct 20256312 PMAQI
3rd Oct 2025641 PMAQI
3rd Oct 2025642 PMAQI
3rd Oct 2025613 PMAQI
3rd Oct 2025594 PMAQI
3rd Oct 2025585 PMAQI
3rd Oct 2025546 PMAQI
3rd Oct 2025547 PMAQI
3rd Oct 2025578 PMAQI
3rd Oct 2025589 PMAQI
3rd Oct 20256410 PMAQI
3rd Oct 20256711 PMAQI
4th Oct 20257912 AMAQI
4th Oct 2025811 AMAQI
4th Oct 2025812 AMAQI
4th Oct 2025723 AMAQI
4th Oct 2025694 AMAQI
4th Oct 2025685 AMAQI

25°C18/33°C

4th Oct 2025656 AMAQI
6 AM
4th Oct 2025637 AMAQI
4th Oct 2025648 AMAQI
4th Oct 2025609 AMAQI
4th Oct 20255810 AMAQI
4th Oct 20255811 AMAQI
4th Oct 20255712 PMAQI
12 PM
4th Oct 2025561 PMAQI
4th Oct 2025552 PMAQI
4th Oct 2025563 PMAQI
4th Oct 2025544 PMAQI
7 PM
12 AM
5 AM

--°C/°C

Day time
Avg. Highest Time
9 AM - 7 PM

48AQI

11 hours / Day
330 hours / Month
Avg. Lowest Time
6 AM - 8 AM

46AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 AM to 7 PM (Avg. 48), while the lowest AQI was between 6 AM to 8 AM (Avg. 46).
Night time
Avg. Highest Time
12 AM - 1 AM

48AQI

2 hours / Day
60 hours / Month
Avg. Lowest Time
2 AM - 11 PM

46AQI

8 hours / Day
240 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 1 AM (Avg. 48), while the lowest AQI was between 2 AM to 11 PM (Avg. 46).

2025 Days Vs Air Quality

Houston, Chester, Illinois, United States

2025

80%

220

20%

55

0.3%

1

Total number of days with different AQI categories in last 277 days in 2025 (88 days remaining)

Good
220 Days
Moderate
55 Days
Poor
1 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 80%

Health Risk Level:

Low

In 2025, 80% of 277 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.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
22AQI
2nd January 2025
25AQI
3rd January 2025
24AQI
4th January 2025
20AQI
5th January 2025
20AQI
6th January 2025
20AQI
7th January 2025
24AQI
8th January 2025
42AQI
9th January 2025
54AQI
10th January 2025
54AQI
11th January 2025
35AQI
12th January 2025
31AQI
13th January 2025
23AQI
14th January 2025
26AQI
15th January 2025
33AQI
16th January 2025
30AQI
17th January 2025
27AQI
18th January 2025
20AQI
19th January 2025
19AQI
20th January 2025
20AQI
21st January 2025
22AQI
22nd January 2025
25AQI
23rd January 2025
26AQI
24th January 2025
30AQI
25th January 2025
28AQI
26th January 2025
27AQI
27th January 2025
22AQI
28th January 2025
23AQI
29th January 2025
24AQI
30th January 2025
30AQI
31st January 2025
21AQI
1st February 2025
31AQI
2nd February 2025
26AQI
3rd February 2025
33AQI
4th February 2025
29AQI
5th February 2025
29AQI
6th February 2025
26AQI
7th February 2025
25AQI
8th February 2025
32AQI
9th February 2025
35AQI
10th February 2025
33AQI
11th February 2025
30AQI
12th February 2025
42AQI
13th February 2025
30AQI
14th February 2025
26AQI
15th February 2025
23AQI
16th February 2025
40AQI
17th February 2025
20AQI
18th February 2025
22AQI
19th February 2025
21AQI
20th February 2025
22AQI
21st February 2025
30AQI
22nd February 2025
37AQI
23rd February 2025
32AQI
24th February 2025
28AQI
25th February 2025
28AQI
26th February 2025
26AQI
27th February 2025
30AQI
28th February 2025
28AQI
1st March 2025
27AQI
2nd March 2025
27AQI
3rd March 2025
32AQI
4th March 2025
42AQI
5th March 2025
26AQI
6th March 2025
27AQI
7th March 2025
28AQI
8th March 2025
33AQI
9th March 2025
40AQI
10th March 2025
46AQI
11th March 2025
56AQI
12th March 2025
55AQI
13th March 2025
67AQI
14th March 2025
50AQI
15th March 2025
117AQI
16th March 2025
29AQI
17th March 2025
32AQI
18th March 2025
25AQI
19th March 2025
31AQI
20th March 2025
19AQI
21st March 2025
27AQI
22nd March 2025
21AQI
23rd March 2025
26AQI
24th March 2025
19AQI
25th March 2025
20AQI
26th March 2025
33AQI
27th March 2025
46AQI
28th March 2025
45AQI
29th March 2025
47AQI
30th March 2025
32AQI
31st March 2025
20AQI
1st April 2025
28AQI
2nd April 2025
31AQI
3rd April 2025
25AQI
4th April 2025
22AQI
5th April 2025
18AQI
6th April 2025
23AQI
7th April 2025
26AQI
8th April 2025
18AQI
9th April 2025
22AQI
10th April 2025
40AQI
11th April 2025
39AQI
12th April 2025
44AQI
13th April 2025
43AQI
14th April 2025
41AQI
15th April 2025
23AQI
16th April 2025
28AQI
17th April 2025
45AQI
18th April 2025
60AQI
19th April 2025
40AQI
20th April 2025
49AQI
21st April 2025
21AQI
22nd April 2025
26AQI
23rd April 2025
32AQI
24th April 2025
41AQI
25th April 2025
40AQI
26th April 2025
34AQI
27th April 2025
24AQI
28th April 2025
37AQI
29th April 2025
41AQI
30th April 2025
38AQI
1st May 2025
27AQI
2nd May 2025
27AQI
3rd May 2025
30AQI
4th May 2025
22AQI
5th May 2025
19AQI
6th May 2025
26AQI
7th May 2025
23AQI
8th May 2025
27AQI
9th May 2025
25AQI
10th May 2025
26AQI
11th May 2025
32AQI
12th May 2025
25AQI
13th May 2025
22AQI
14th May 2025
41AQI
15th May 2025
54AQI
16th May 2025
54AQI
17th May 2025
27AQI
18th May 2025
22AQI
19th May 2025
29AQI
20th May 2025
29AQI
21st May 2025
16AQI
22nd May 2025
14AQI
23rd May 2025
17AQI
24th May 2025
29AQI
25th May 2025
34AQI
26th May 2025
22AQI
27th May 2025
21AQI
28th May 2025
28AQI
29th May 2025
37AQI
30th May 2025
29AQI
31st May 2025
41AQI
1st June 2025
39AQI
2nd June 2025
44AQI
3rd June 2025
57AQI
4th June 2025
61AQI
5th June 2025
52AQI
6th June 2025
47AQI
7th June 2025
53AQI
8th June 2025
53AQI
9th June 2025
57AQI
10th June 2025
61AQI
11th June 2025
68AQI
12th June 2025
79AQI
13th June 2025
44AQI
14th June 2025
38AQI
15th June 2025
41AQI
16th June 2025
28AQI
17th June 2025
36AQI
18th June 2025
34AQI
19th June 2025
26AQI
20th June 2025
38AQI
21st June 2025
50AQI
22nd June 2025
53AQI
23rd June 2025
57AQI
24th June 2025
55AQI
25th June 2025
54AQI
26th June 2025
52AQI
27th June 2025
42AQI
28th June 2025
28AQI
29th June 2025
27AQI
30th June 2025
29AQI
1st July 2025
30AQI
2nd July 2025
38AQI
3rd July 2025
53AQI
4th July 2025
60AQI
5th July 2025
70AQI
6th July 2025
59AQI
7th July 2025
40AQI
8th July 2025
39AQI
9th July 2025
34AQI
10th July 2025
42AQI
11th July 2025
43AQI
12th July 2025
40AQI
13th July 2025
33AQI
14th July 2025
33AQI
15th July 2025
34AQI
16th July 2025
34AQI
17th July 2025
37AQI
18th July 2025
31AQI
19th July 2025
43AQI
20th July 2025
52AQI
21st July 2025
34AQI
22nd July 2025
41AQI
23rd July 2025
50AQI
24th July 2025
54AQI
25th July 2025
54AQI
26th July 2025
44AQI
27th July 2025
30AQI
28th July 2025
36AQI
29th July 2025
45AQI
30th July 2025
46AQI
31st July 2025
38AQI
1st August 2025
89AQI
2nd August 2025
78AQI
3rd August 2025
51AQI
4th August 2025
38AQI
5th August 2025
40AQI
6th August 2025
45AQI
7th August 2025
50AQI
8th August 2025
52AQI
9th August 2025
49AQI
10th August 2025
47AQI
11th August 2025
44AQI
12th August 2025
41AQI
13th August 2025
38AQI
14th August 2025
52AQI
15th August 2025
53AQI
16th August 2025
53AQI
17th August 2025
53AQI
18th August 2025
52AQI
19th August 2025
51AQI
20th August 2025
32AQI
21st August 2025
22AQI
22nd August 2025
26AQI
23rd August 2025
36AQI
24th August 2025
29AQI
25th August 2025
25AQI
26th August 2025
25AQI
27th August 2025
30AQI
28th August 2025
34AQI
29th August 2025
42AQI
30th August 2025
40AQI
31st August 2025
32AQI
1st September 2025
29AQI
2nd September 2025
29AQI
3rd September 2025
37AQI
4th September 2025
59AQI
5th September 2025
57AQI
6th September 2025
33AQI
7th September 2025
26AQI
8th September 2025
25AQI
9th September 2025
34AQI
10th September 2025
48AQI
11th September 2025
56AQI
12th September 2025
59AQI
13th September 2025
60AQI
14th September 2025
57AQI
15th September 2025
55AQI
16th September 2025
59AQI
17th September 2025
57AQI
18th September 2025
56AQI
19th September 2025
46AQI
20th September 2025
51AQI
21st September 2025
48AQI
22nd September 2025
38AQI
23rd September 2025
44AQI
24th September 2025
37AQI
25th September 2025
32AQI
26th September 2025
30AQI
27th September 2025
37AQI
28th September 2025
34AQI
29th September 2025
51AQI
30th September 2025
58AQI
1st October 2025
56AQI
2nd October 2025
53AQI
3rd October 2025
51AQI
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
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

53AQI

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
3
220
55
1

Highest AQI recorded in

October

53AQI

Lowest AQI recorded in

January

27AQI

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

October

37AQI

Lowest AQI recorded in

January

24AQI

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

June

59AQI

Lowest AQI recorded in

December

25AQI

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

June

44AQI

Lowest AQI recorded in

September

32AQI

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

July

50AQI

Lowest AQI recorded in

October

30AQI

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

June

48AQI

Lowest AQI recorded in

May

32AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2020(Avg.)
40AQI
Least Polluted Year Recorded
2024(Avg.)
31AQI

Houston's annual 2025 AQI (37) shows an average percentage change of 2.5% (worsened AQI) compared to previous years: 2020 (40), 2021 (38), 2022 (36), 2023 (38), 2024 (31).