Koizuka, Kumagaya, Saitama, Japan 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
Koizuka, Kumagaya, Saitama, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Oct 2025
70AQILowest AQI recorded on
13th Oct 2021
18AQISame Day Analysis (16th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 62 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 16th Oct - 17th Oct 2025
Koizuka, Kumagaya, Saitama, Japan
AQI
Day
Night
.
5 AM16th Oct 2025
5 PM
4 AM17th Oct 2025
Day time
Avg. Highest Time
11AM16th Oct
68AQI
Avg. Lowest Time
1PM16th Oct
56AQI
Night time
Avg. Highest Time
12AM17th Oct
70AQI
Avg. Lowest Time
3AM17th Oct
43AQI
In the last 24 hours,
Koizuka's AQI reached its highest point of 70 at 12 AM during the Night, while the lowest point, 43, was recorded at 3 AM during the Night between 16th Oct and 17th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Koizuka, Kumagaya, Saitama, Japan
SepOct
17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th
Day
Night
17th Sep 2025375 AMAQI
17th Sep 2025386 AMAQI
17th Sep 2025387 AMAQI
17th Sep 2025388 AMAQI
17th Sep 2025469 AMAQI
17th Sep 20255310 AMAQI
17th Sep 20255411 AMAQI
17th Sep 20255612 PMAQI
17th Sep 2025551 PMAQI
17th Sep 2025602 PMAQI
17th Sep 2025553 PMAQI
17th Sep 2025494 PMAQI
17th Sep 2025545 PMAQI
17th Sep 2025466 PMAQI
17th Sep 2025567 PMAQI
17th Sep 2025478 PMAQI
17th Sep 2025489 PMAQI
17th Sep 20255010 PMAQI
17th Sep 20253711 PMAQI
18th Sep 20253612 AMAQI
18th Sep 2025411 AMAQI
18th Sep 2025342 AMAQI
18th Sep 2025353 AMAQI
18th Sep 2025374 AMAQI
31°C26/36°C
18th Sep 2025405 AMAQI
18th Sep 2025406 AMAQI
18th Sep 2025407 AMAQI
18th Sep 2025408 AMAQI
18th Sep 2025529 AMAQI
18th Sep 20255610 AMAQI
18th Sep 20256211 AMAQI
18th Sep 20256012 PMAQI
18th Sep 2025571 PMAQI
18th Sep 2025562 PMAQI
18th Sep 2025513 PMAQI
18th Sep 2025444 PMAQI
18th Sep 2025255 PMAQI
18th Sep 2025266 PMAQI
18th Sep 2025357 PMAQI
18th Sep 2025408 PMAQI
18th Sep 2025359 PMAQI
18th Sep 20253410 PMAQI
18th Sep 20253211 PMAQI
19th Sep 20253212 AMAQI
19th Sep 2025331 AMAQI
19th Sep 2025362 AMAQI
19th Sep 2025353 AMAQI
19th Sep 2025384 AMAQI
29°C23/36°C
19th Sep 2025425 AMAQI
19th Sep 2025416 AMAQI
19th Sep 2025417 AMAQI
19th Sep 2025408 AMAQI
19th Sep 2025309 AMAQI
19th Sep 20252810 AMAQI
19th Sep 20252911 AMAQI
19th Sep 20252512 PMAQI
19th Sep 2025211 PMAQI
19th Sep 2025222 PMAQI
19th Sep 2025243 PMAQI
19th Sep 2025264 PMAQI
19th Sep 2025385 PMAQI
19th Sep 2025306 PMAQI
19th Sep 2025317 PMAQI
19th Sep 2025368 PMAQI
19th Sep 2025389 PMAQI
19th Sep 20254010 PMAQI
19th Sep 20253511 PMAQI
20th Sep 20253612 AMAQI
20th Sep 2025421 AMAQI
20th Sep 2025382 AMAQI
20th Sep 2025383 AMAQI
20th Sep 2025364 AMAQI
22°C21/23°C
20th Sep 2025345 AMAQI
20th Sep 2025356 AMAQI
20th Sep 2025357 AMAQI
20th Sep 2025348 AMAQI
20th Sep 2025229 AMAQI
20th Sep 20251810 AMAQI
20th Sep 20251811 AMAQI
20th Sep 20252012 PMAQI
20th Sep 2025241 PMAQI
20th Sep 2025262 PMAQI
20th Sep 2025263 PMAQI
20th Sep 2025284 PMAQI
20th Sep 2025305 PMAQI
20th Sep 2025266 PMAQI
20th Sep 2025387 PMAQI
20th Sep 2025478 PMAQI
20th Sep 2025419 PMAQI
20th Sep 20253710 PMAQI
20th Sep 20253411 PMAQI
21st Sep 20253212 AMAQI
21st Sep 2025331 AMAQI
21st Sep 2025352 AMAQI
21st Sep 2025353 AMAQI
21st Sep 2025344 AMAQI
23°C21/24°C
21st Sep 2025325 AMAQI
21st Sep 2025336 AMAQI
21st Sep 2025337 AMAQI
21st Sep 2025328 AMAQI
21st Sep 2025199 AMAQI
21st Sep 20251410 AMAQI
21st Sep 20251311 AMAQI
21st Sep 20251412 PMAQI
21st Sep 2025201 PMAQI
21st Sep 2025292 PMAQI
21st Sep 2025373 PMAQI
21st Sep 2025364 PMAQI
21st Sep 2025175 PMAQI
21st Sep 2025166 PMAQI
21st Sep 2025177 PMAQI
21st Sep 2025318 PMAQI
21st Sep 2025359 PMAQI
21st Sep 20253010 PMAQI
21st Sep 20253011 PMAQI
22nd Sep 20253012 AMAQI
22nd Sep 2025351 AMAQI
22nd Sep 2025332 AMAQI
22nd Sep 2025343 AMAQI
22nd Sep 2025324 AMAQI
25°C22/31°C
22nd Sep 2025305 AMAQI
22nd Sep 2025306 AMAQI
22nd Sep 2025307 AMAQI
22nd Sep 2025318 AMAQI
22nd Sep 2025209 AMAQI
22nd Sep 20253710 AMAQI
22nd Sep 20252611 AMAQI
22nd Sep 20252412 PMAQI
22nd Sep 2025321 PMAQI
22nd Sep 2025422 PMAQI
22nd Sep 2025413 PMAQI
22nd Sep 2025354 PMAQI
22nd Sep 2025285 PMAQI
22nd Sep 2025286 PMAQI
22nd Sep 2025287 PMAQI
22nd Sep 2025278 PMAQI
22nd Sep 2025289 PMAQI
22nd Sep 20252810 PMAQI
22nd Sep 20252711 PMAQI
23rd Sep 20252812 AMAQI
23rd Sep 2025291 AMAQI
23rd Sep 2025302 AMAQI
23rd Sep 2025313 AMAQI
23rd Sep 2025304 AMAQI
23°C20/26°C
23rd Sep 2025295 AMAQI
23rd Sep 2025306 AMAQI
23rd Sep 2025307 AMAQI
23rd Sep 2025298 AMAQI
23rd Sep 2025259 AMAQI
23rd Sep 20252210 AMAQI
23rd Sep 20252311 AMAQI
23rd Sep 20252312 PMAQI
23rd Sep 2025231 PMAQI
23rd Sep 2025232 PMAQI
23rd Sep 2025223 PMAQI
23rd Sep 2025244 PMAQI
23rd Sep 2025295 PMAQI
23rd Sep 2025326 PMAQI
23rd Sep 2025367 PMAQI
23rd Sep 2025368 PMAQI
23rd Sep 2025319 PMAQI
23rd Sep 20253010 PMAQI
23rd Sep 20252811 PMAQI
24th Sep 20252912 AMAQI
24th Sep 2025291 AMAQI
24th Sep 2025292 AMAQI
24th Sep 2025293 AMAQI
24th Sep 2025284 AMAQI
23°C20/26°C
24th Sep 2025285 AMAQI
24th Sep 2025276 AMAQI
24th Sep 2025287 AMAQI
24th Sep 2025278 AMAQI
24th Sep 2025289 AMAQI
24th Sep 20252410 AMAQI
24th Sep 20252411 AMAQI
24th Sep 20252612 PMAQI
24th Sep 2025271 PMAQI
24th Sep 2025292 PMAQI
24th Sep 2025333 PMAQI
24th Sep 2025384 PMAQI
24th Sep 2025415 PMAQI
24th Sep 2025396 PMAQI
24th Sep 2025367 PMAQI
24th Sep 2025348 PMAQI
24th Sep 2025289 PMAQI
24th Sep 20252910 PMAQI
24th Sep 20253011 PMAQI
25th Sep 20252712 AMAQI
25th Sep 2025281 AMAQI
25th Sep 2025282 AMAQI
25th Sep 2025283 AMAQI
25th Sep 2025284 AMAQI
23°C20/27°C
25th Sep 2025285 AMAQI
25th Sep 2025276 AMAQI
25th Sep 2025287 AMAQI
25th Sep 2025288 AMAQI
25th Sep 2025309 AMAQI
25th Sep 20252210 AMAQI
25th Sep 20253811 AMAQI
25th Sep 20254712 PMAQI
25th Sep 2025441 PMAQI
25th Sep 2025472 PMAQI
25th Sep 2025633 PMAQI
25th Sep 2025644 PMAQI
25th Sep 2025575 PMAQI
25th Sep 2025556 PMAQI
25th Sep 2025577 PMAQI
25th Sep 2025598 PMAQI
25th Sep 2025609 PMAQI
25th Sep 20255710 PMAQI
25th Sep 20255811 PMAQI
26th Sep 20255912 AMAQI
26th Sep 2025551 AMAQI
26th Sep 2025542 AMAQI
26th Sep 2025513 AMAQI
26th Sep 2025514 AMAQI
25°C21/30°C
26th Sep 2025485 AMAQI
26th Sep 2025496 AMAQI
26th Sep 2025547 AMAQI
26th Sep 2025528 AMAQI
26th Sep 2025579 AMAQI
26th Sep 20255610 AMAQI
26th Sep 20255511 AMAQI
26th Sep 20255612 PMAQI
26th Sep 2025561 PMAQI
26th Sep 2025552 PMAQI
26th Sep 2025543 PMAQI
26th Sep 2025544 PMAQI
26th Sep 2025605 PMAQI
26th Sep 2025596 PMAQI
26th Sep 2025597 PMAQI
26th Sep 2025558 PMAQI
26th Sep 2025529 PMAQI
26th Sep 20255610 PMAQI
26th Sep 20255311 PMAQI
27th Sep 20255012 AMAQI
27th Sep 2025481 AMAQI
27th Sep 2025502 AMAQI
27th Sep 2025523 AMAQI
27th Sep 2025444 AMAQI
27°C23/32°C
27th Sep 2025465 AMAQI
27th Sep 2025406 AMAQI
27th Sep 2025307 AMAQI
27th Sep 2025288 AMAQI
27th Sep 2025249 AMAQI
27th Sep 20253110 AMAQI
27th Sep 20253711 AMAQI
27th Sep 20254012 PMAQI
27th Sep 2025391 PMAQI
27th Sep 2025332 PMAQI
27th Sep 2025373 PMAQI
27th Sep 2025334 PMAQI
27th Sep 2025365 PMAQI
27th Sep 2025496 PMAQI
27th Sep 2025517 PMAQI
27th Sep 2025498 PMAQI
27th Sep 2025449 PMAQI
27th Sep 20254210 PMAQI
27th Sep 20254011 PMAQI
28th Sep 20254412 AMAQI
28th Sep 2025401 AMAQI
28th Sep 2025392 AMAQI
28th Sep 2025403 AMAQI
28th Sep 2025474 AMAQI
26°C23/29°C
28th Sep 2025405 AMAQI
28th Sep 2025426 AMAQI
28th Sep 2025447 AMAQI
28th Sep 2025448 AMAQI
28th Sep 2025419 AMAQI
28th Sep 20253910 AMAQI
28th Sep 20254411 AMAQI
28th Sep 20254812 PMAQI
28th Sep 2025461 PMAQI
28th Sep 2025502 PMAQI
28th Sep 2025463 PMAQI
28th Sep 2025444 PMAQI
28th Sep 2025425 PMAQI
28th Sep 2025506 PMAQI
28th Sep 2025507 PMAQI
28th Sep 2025468 PMAQI
28th Sep 2025449 PMAQI
28th Sep 20254410 PMAQI
28th Sep 20253811 PMAQI
29th Sep 20253412 AMAQI
29th Sep 2025341 AMAQI
29th Sep 2025362 AMAQI
29th Sep 2025423 AMAQI
29th Sep 2025444 AMAQI
25°C23/27°C
29th Sep 2025465 AMAQI
29th Sep 2025466 AMAQI
29th Sep 2025447 AMAQI
29th Sep 2025448 AMAQI
29th Sep 2025389 AMAQI
29th Sep 20253010 AMAQI
29th Sep 20253011 AMAQI
29th Sep 20252612 PMAQI
29th Sep 2025171 PMAQI
29th Sep 2025122 PMAQI
29th Sep 2025133 PMAQI
29th Sep 2025304 PMAQI
29th Sep 2025235 PMAQI
29th Sep 2025206 PMAQI
29th Sep 2025227 PMAQI
29th Sep 2025138 PMAQI
29th Sep 2025129 PMAQI
29th Sep 20251310 PMAQI
29th Sep 20251511 PMAQI
30th Sep 20251412 AMAQI
30th Sep 2025141 AMAQI
30th Sep 2025182 AMAQI
30th Sep 2025133 AMAQI
30th Sep 2025104 AMAQI
27°C23/34°C
30th Sep 2025125 AMAQI
30th Sep 2025156 AMAQI
30th Sep 2025257 AMAQI
30th Sep 2025288 AMAQI
30th Sep 2025189 AMAQI
30th Sep 20252410 AMAQI
30th Sep 20251511 AMAQI
30th Sep 20252412 PMAQI
30th Sep 2025321 PMAQI
30th Sep 2025332 PMAQI
30th Sep 2025303 PMAQI
30th Sep 2025374 PMAQI
30th Sep 2025425 PMAQI
30th Sep 2025416 PMAQI
30th Sep 2025477 PMAQI
30th Sep 2025388 PMAQI
30th Sep 2025369 PMAQI
30th Sep 20253510 PMAQI
30th Sep 20253111 PMAQI
1st Oct 20253612 AMAQI
1st Oct 2025411 AMAQI
1st Oct 2025372 AMAQI
1st Oct 2025343 AMAQI
1st Oct 2025324 AMAQI
24°C22/27°C
1st Oct 2025335 AMAQI
1st Oct 2025326 AMAQI
1st Oct 2025327 AMAQI
1st Oct 2025398 AMAQI
1st Oct 2025389 AMAQI
1st Oct 20252410 AMAQI
1st Oct 20251711 AMAQI
1st Oct 20252912 PMAQI
1st Oct 2025391 PMAQI
1st Oct 2025372 PMAQI
1st Oct 2025423 PMAQI
1st Oct 2025504 PMAQI
1st Oct 2025495 PMAQI
1st Oct 2025466 PMAQI
1st Oct 2025397 PMAQI
1st Oct 2025408 PMAQI
1st Oct 2025329 PMAQI
1st Oct 20252810 PMAQI
1st Oct 20253011 PMAQI
2nd Oct 20253712 AMAQI
2nd Oct 2025361 AMAQI
2nd Oct 2025362 AMAQI
2nd Oct 2025353 AMAQI
2nd Oct 2025484 AMAQI
20°C19/20°C
2nd Oct 2025485 AMAQI
2nd Oct 2025446 AMAQI
2nd Oct 2025447 AMAQI
2nd Oct 2025388 AMAQI
2nd Oct 2025459 AMAQI
2nd Oct 20253810 AMAQI
2nd Oct 20255011 AMAQI
2nd Oct 20255112 PMAQI
2nd Oct 2025511 PMAQI
2nd Oct 2025482 PMAQI
2nd Oct 2025353 PMAQI
2nd Oct 2025344 PMAQI
2nd Oct 2025405 PMAQI
2nd Oct 2025486 PMAQI
2nd Oct 2025547 PMAQI
2nd Oct 2025538 PMAQI
2nd Oct 2025569 PMAQI
2nd Oct 20255710 PMAQI
2nd Oct 20255811 PMAQI
3rd Oct 20255912 AMAQI
3rd Oct 2025561 AMAQI
3rd Oct 2025582 AMAQI
3rd Oct 2025553 AMAQI
3rd Oct 2025564 AMAQI
22°C18/28°C
3rd Oct 2025545 AMAQI
3rd Oct 2025506 AMAQI
3rd Oct 2025507 AMAQI
3rd Oct 2025558 AMAQI
3rd Oct 2025549 AMAQI
3rd Oct 20255210 AMAQI
3rd Oct 20255311 AMAQI
3rd Oct 20255412 PMAQI
3rd Oct 2025551 PMAQI
3rd Oct 2025532 PMAQI
3rd Oct 2025553 PMAQI
3rd Oct 2025564 PMAQI
3rd Oct 2025555 PMAQI
3rd Oct 2025546 PMAQI
3rd Oct 2025567 PMAQI
3rd Oct 2025518 PMAQI
3rd Oct 2025679 PMAQI
3rd Oct 20257210 PMAQI
3rd Oct 20257611 PMAQI
4th Oct 20257412 AMAQI
4th Oct 2025731 AMAQI
4th Oct 2025742 AMAQI
4th Oct 2025713 AMAQI
4th Oct 2025734 AMAQI
23°C20/26°C
4th Oct 2025715 AMAQI
4th Oct 2025696 AMAQI
4th Oct 2025757 AMAQI
4th Oct 2025758 AMAQI
4th Oct 2025729 AMAQI
4th Oct 20256710 AMAQI
4th Oct 20256611 AMAQI
4th Oct 20256512 PMAQI
4th Oct 2025701 PMAQI
4th Oct 2025702 PMAQI
4th Oct 2025713 PMAQI
4th Oct 2025704 PMAQI
4th Oct 2025735 PMAQI
4th Oct 2025646 PMAQI
4th Oct 2025667 PMAQI
4th Oct 2025688 PMAQI
4th Oct 2025729 PMAQI
4th Oct 20257110 PMAQI
4th Oct 20256611 PMAQI
5th Oct 20256712 AMAQI
5th Oct 2025611 AMAQI
5th Oct 2025592 AMAQI
5th Oct 2025613 AMAQI
5th Oct 2025614 AMAQI
23°C21/24°C
5th Oct 2025615 AMAQI
5th Oct 2025596 AMAQI
5th Oct 2025597 AMAQI
5th Oct 2025538 AMAQI
5th Oct 2025559 AMAQI
5th Oct 20255510 AMAQI
5th Oct 20255811 AMAQI
5th Oct 20255812 PMAQI
5th Oct 2025591 PMAQI
5th Oct 2025532 PMAQI
5th Oct 2025543 PMAQI
5th Oct 2025544 PMAQI
5th Oct 2025595 PMAQI
5th Oct 2025646 PMAQI
5th Oct 2025627 PMAQI
5th Oct 2025608 PMAQI
5th Oct 2025619 PMAQI
5th Oct 20256010 PMAQI
5th Oct 20255611 PMAQI
6th Oct 20256212 AMAQI
6th Oct 2025601 AMAQI
6th Oct 2025582 AMAQI
6th Oct 2025563 AMAQI
6th Oct 2025564 AMAQI
24°C20/28°C
6th Oct 2025525 AMAQI
6th Oct 2025596 AMAQI
6th Oct 2025587 AMAQI
6th Oct 2025588 AMAQI
6th Oct 2025629 AMAQI
6th Oct 20256210 AMAQI
6th Oct 20256111 AMAQI
6th Oct 20256012 PMAQI
6th Oct 2025621 PMAQI
6th Oct 2025592 PMAQI
6th Oct 2025503 PMAQI
6th Oct 2025504 PMAQI
6th Oct 2025525 PMAQI
6th Oct 2025536 PMAQI
6th Oct 2025677 PMAQI
6th Oct 2025658 PMAQI
6th Oct 2025649 PMAQI
6th Oct 20256910 PMAQI
6th Oct 20257211 PMAQI
7th Oct 20256812 AMAQI
7th Oct 2025681 AMAQI
7th Oct 2025672 AMAQI
25°C20/30°C
7th Oct 2025548 PMAQI
7th Oct 2025479 PMAQI
7th Oct 20256510 PMAQI
7th Oct 20256011 PMAQI
8th Oct 20256412 AMAQI
8th Oct 2025631 AMAQI
8th Oct 2025612 AMAQI
8th Oct 2025653 AMAQI
8th Oct 2025584 AMAQI
20°C20/21°C
8th Oct 2025565 AMAQI
8th Oct 2025586 AMAQI
8th Oct 2025607 AMAQI
8th Oct 2025638 AMAQI
8th Oct 2025619 AMAQI
8th Oct 20256110 AMAQI
8th Oct 20256211 AMAQI
8th Oct 20256612 PMAQI
8th Oct 2025631 PMAQI
8th Oct 2025572 PMAQI
8th Oct 2025553 PMAQI
8th Oct 2025564 PMAQI
8th Oct 2025565 PMAQI
8th Oct 2025616 PMAQI
8th Oct 2025707 PMAQI
8th Oct 2025668 PMAQI
8th Oct 2025869 PMAQI
8th Oct 20259110 PMAQI
8th Oct 20259311 PMAQI
9th Oct 20257712 AMAQI
9th Oct 2025661 AMAQI
9th Oct 2025612 AMAQI
9th Oct 2025593 AMAQI
9th Oct 2025564 AMAQI
24°C20/29°C
9th Oct 2025395 AMAQI
9th Oct 2025346 AMAQI
9th Oct 2025357 AMAQI
9th Oct 2025368 AMAQI
9th Oct 2025329 AMAQI
9th Oct 20253610 AMAQI
9th Oct 20253411 AMAQI
9th Oct 20253612 PMAQI
9th Oct 2025421 PMAQI
9th Oct 2025462 PMAQI
9th Oct 2025483 PMAQI
9th Oct 2025394 PMAQI
9th Oct 2025405 PMAQI
9th Oct 2025556 PMAQI
9th Oct 2025557 PMAQI
9th Oct 2025478 PMAQI
9th Oct 2025389 PMAQI
9th Oct 20253910 PMAQI
9th Oct 20253911 PMAQI
10th Oct 20253612 AMAQI
10th Oct 2025381 AMAQI
10th Oct 2025422 AMAQI
10th Oct 2025393 AMAQI
10th Oct 2025494 AMAQI
21°C18/22°C
10th Oct 2025465 AMAQI
10th Oct 2025446 AMAQI
10th Oct 2025467 AMAQI
10th Oct 2025408 AMAQI
10th Oct 2025349 AMAQI
10th Oct 20253510 AMAQI
10th Oct 20253511 AMAQI
10th Oct 20253612 PMAQI
10th Oct 2025491 PMAQI
10th Oct 2025502 PMAQI
10th Oct 2025553 PMAQI
10th Oct 2025564 PMAQI
10th Oct 2025615 PMAQI
10th Oct 2025676 PMAQI
10th Oct 2025717 PMAQI
10th Oct 2025708 PMAQI
10th Oct 2025779 PMAQI
10th Oct 20257410 PMAQI
10th Oct 20258111 PMAQI
11th Oct 20257512 AMAQI
11th Oct 2025721 AMAQI
11th Oct 2025712 AMAQI
11th Oct 2025723 AMAQI
11th Oct 2025764 AMAQI
21°C18/24°C
11th Oct 2025685 AMAQI
11th Oct 2025676 AMAQI
11th Oct 2025667 AMAQI
11th Oct 2025708 AMAQI
11th Oct 2025629 AMAQI
11th Oct 20255810 AMAQI
11th Oct 20256011 AMAQI
11th Oct 20256112 PMAQI
11th Oct 2025631 PMAQI
11th Oct 2025622 PMAQI
11th Oct 2025623 PMAQI
11th Oct 2025594 PMAQI
11th Oct 2025585 PMAQI
11th Oct 2025526 PMAQI
11th Oct 2025477 PMAQI
11th Oct 2025478 PMAQI
11th Oct 2025439 PMAQI
11th Oct 20254910 PMAQI
11th Oct 20254311 PMAQI
12th Oct 20254812 AMAQI
12th Oct 2025451 AMAQI
12th Oct 2025492 AMAQI
12th Oct 2025533 AMAQI
12th Oct 2025514 AMAQI
19°C18/20°C
12th Oct 2025505 AMAQI
12th Oct 2025516 AMAQI
12th Oct 2025507 AMAQI
12th Oct 2025558 AMAQI
12th Oct 2025569 AMAQI
12th Oct 20255610 AMAQI
12th Oct 20256011 AMAQI
12th Oct 20256012 PMAQI
12th Oct 2025661 PMAQI
12th Oct 2025542 PMAQI
12th Oct 2025513 PMAQI
12th Oct 2025504 PMAQI
12th Oct 2025555 PMAQI
12th Oct 2025616 PMAQI
12th Oct 2025577 PMAQI
12th Oct 2025578 PMAQI
12th Oct 2025599 PMAQI
12th Oct 20256210 PMAQI
12th Oct 20256411 PMAQI
13th Oct 20256212 AMAQI
13th Oct 2025631 AMAQI
13th Oct 2025622 AMAQI
13th Oct 2025653 AMAQI
13th Oct 2025654 AMAQI
22°C17/26°C
13th Oct 2025645 AMAQI
13th Oct 2025626 AMAQI
13th Oct 2025637 AMAQI
13th Oct 2025668 AMAQI
13th Oct 2025669 AMAQI
13th Oct 20256810 AMAQI
13th Oct 20256711 AMAQI
13th Oct 20257212 PMAQI
13th Oct 2025781 PMAQI
13th Oct 2025762 PMAQI
13th Oct 2025733 PMAQI
13th Oct 2025684 PMAQI
13th Oct 2025685 PMAQI
13th Oct 2025636 PMAQI
13th Oct 2025597 PMAQI
13th Oct 2025598 PMAQI
13th Oct 2025639 PMAQI
13th Oct 20256310 PMAQI
13th Oct 20256311 PMAQI
14th Oct 20255812 AMAQI
14th Oct 2025571 AMAQI
14th Oct 2025572 AMAQI
14th Oct 2025583 AMAQI
14th Oct 2025604 AMAQI
22°C21/24°C
14th Oct 2025635 AMAQI
14th Oct 2025626 AMAQI
14th Oct 2025627 AMAQI
14th Oct 2025638 AMAQI
14th Oct 2025629 AMAQI
14th Oct 20256710 AMAQI
14th Oct 20256611 AMAQI
14th Oct 20256712 PMAQI
14th Oct 2025661 PMAQI
14th Oct 2025592 PMAQI
14th Oct 2025583 PMAQI
14th Oct 2025584 PMAQI
14th Oct 2025645 PMAQI
14th Oct 2025676 PMAQI
14th Oct 2025667 PMAQI
14th Oct 2025718 PMAQI
14th Oct 2025739 PMAQI
14th Oct 20257610 PMAQI
14th Oct 20257011 PMAQI
15th Oct 20256312 AMAQI
15th Oct 2025591 AMAQI
15th Oct 2025592 AMAQI
15th Oct 2025563 AMAQI
15th Oct 2025604 AMAQI
19°C16/20°C
15th Oct 2025625 AMAQI
15th Oct 2025596 AMAQI
15th Oct 2025577 AMAQI
15th Oct 2025568 AMAQI
15th Oct 2025569 AMAQI
15th Oct 20255910 AMAQI
15th Oct 20256211 AMAQI
15th Oct 20256112 PMAQI
15th Oct 2025621 PMAQI
15th Oct 2025592 PMAQI
15th Oct 2025593 PMAQI
15th Oct 2025574 PMAQI
15th Oct 2025565 PMAQI
15th Oct 2025586 PMAQI
15th Oct 2025587 PMAQI
15th Oct 2025568 PMAQI
15th Oct 2025589 PMAQI
15th Oct 20255810 PMAQI
15th Oct 20255811 PMAQI
16th Oct 20255812 AMAQI
16th Oct 2025661 AMAQI
16th Oct 2025702 AMAQI
16th Oct 2025693 AMAQI
16th Oct 2025654 AMAQI
19°C16/23°C
16th Oct 2025655 AMAQI
16th Oct 2025666 AMAQI
16th Oct 2025677 AMAQI
16th Oct 2025678 AMAQI
16th Oct 2025679 AMAQI
16th Oct 20256610 AMAQI
16th Oct 20256811 AMAQI
16th Oct 20256112 PMAQI
16th Oct 2025561 PMAQI
16th Oct 2025582 PMAQI
16th Oct 2025573 PMAQI
16th Oct 2025594 PMAQI
16th Oct 2025615 PMAQI
16th Oct 2025646 PMAQI
16th Oct 2025657 PMAQI
16th Oct 2025638 PMAQI
16th Oct 2025649 PMAQI
16th Oct 20256810 PMAQI
16th Oct 20256511 PMAQI
17th Oct 20257012 AMAQI
17th Oct 2025671 AMAQI
17th Oct 2025522 AMAQI
17th Oct 2025433 AMAQI
17th Oct 2025494 AMAQI
18°C17/19°C
17th Oct 2025525 AMAQI
5 AM17th Oct 2025536 AMAQI
17th Oct 2025557 AMAQI
17th Oct 2025528 AMAQI
17th Oct 2025529 AMAQI
17th Oct 20255410 AMAQI
17th Oct 20255811 AMAQI
11 AM17th Oct 20256712 PMAQI
17th Oct 2025741 PMAQI
17th Oct 2025662 PMAQI
5 PM
11 PM
4 AM
--°C/°C
Day time
Avg. Highest Time
1 PM - 5 PM
47AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
9 AM - 12 PM
45AQI
4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 PM to 5 PM (Avg. 47), while the lowest AQI was between 9 AM to 12 PM (Avg. 45).
Night time
Avg. Highest Time
7 PM - 10 PM
50AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
12 AM - 6 PM
47AQI
6 hours / Day
180 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 10 PM (Avg. 50), while the lowest AQI was between 12 AM to 6 PM (Avg. 47).
2025 Days Vs Air Quality
Koizuka, Kumagaya, Saitama, Japan
2025
81%
234
19%
55
Total number of days with different AQI categories in last 290 days in 2025 (75 days remaining)
Good
234 DaysModerate
55 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 81%
Health Risk Level:
Low
In 2025, 81% of 290 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
Koizuka, Kumagaya, Saitama, Japan
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
30AQI
30AQI
2nd January 2025
30AQI
30AQI
3rd January 2025
25AQI
25AQI
4th January 2025
27AQI
27AQI
5th January 2025
37AQI
37AQI
6th January 2025
51AQI
51AQI
7th January 2025
34AQI
34AQI
8th January 2025
36AQI
36AQI
9th January 2025
29AQI
29AQI
10th January 2025
27AQI
27AQI
11th January 2025
26AQI
26AQI
12th January 2025
38AQI
38AQI
13th January 2025
29AQI
29AQI
14th January 2025
34AQI
34AQI
15th January 2025
33AQI
33AQI
16th January 2025
33AQI
33AQI
17th January 2025
29AQI
29AQI
18th January 2025
36AQI
36AQI
19th January 2025
45AQI
45AQI
20th January 2025
44AQI
44AQI
21st January 2025
47AQI
47AQI
22nd January 2025
41AQI
41AQI
23rd January 2025
48AQI
48AQI
24th January 2025
51AQI
51AQI
25th January 2025
39AQI
39AQI
26th January 2025
38AQI
38AQI
27th January 2025
39AQI
39AQI
28th January 2025
45AQI
45AQI
29th January 2025
34AQI
34AQI
30th January 2025
35AQI
35AQI
31st January 2025
31AQI
31AQI
1st February 2025
42AQI
42AQI
2nd February 2025
44AQI
44AQI
3rd February 2025
45AQI
45AQI
4th February 2025
38AQI
38AQI
5th February 2025
36AQI
36AQI
6th February 2025
29AQI
29AQI
7th February 2025
33AQI
33AQI
8th February 2025
30AQI
30AQI
9th February 2025
30AQI
30AQI
10th February 2025
29AQI
29AQI
11th February 2025
31AQI
31AQI
12th February 2025
40AQI
40AQI
13th February 2025
34AQI
34AQI
14th February 2025
35AQI
35AQI
15th February 2025
31AQI
31AQI
16th February 2025
41AQI
41AQI
17th February 2025
37AQI
37AQI
18th February 2025
33AQI
33AQI
19th February 2025
31AQI
31AQI
20th February 2025
31AQI
31AQI
21st February 2025
32AQI
32AQI
22nd February 2025
31AQI
31AQI
23rd February 2025
32AQI
32AQI
24th February 2025
33AQI
33AQI
25th February 2025
35AQI
35AQI
26th February 2025
39AQI
39AQI
27th February 2025
44AQI
44AQI
28th February 2025
53AQI
53AQI
1st March 2025
54AQI
54AQI
2nd March 2025
59AQI
59AQI
3rd March 2025
41AQI
41AQI
4th March 2025
39AQI
39AQI
5th March 2025
27AQI
27AQI
6th March 2025
35AQI
35AQI
7th March 2025
32AQI
32AQI
8th March 2025
43AQI
43AQI
9th March 2025
37AQI
37AQI
10th March 2025
40AQI
40AQI
11th March 2025
47AQI
47AQI
12th March 2025
52AQI
52AQI
13th March 2025
52AQI
52AQI
14th March 2025
42AQI
42AQI
15th March 2025
44AQI
44AQI
16th March 2025
27AQI
27AQI
17th March 2025
24AQI
24AQI
18th March 2025
27AQI
27AQI
19th March 2025
19AQI
19AQI
20th March 2025
27AQI
27AQI
21st March 2025
38AQI
38AQI
22nd March 2025
48AQI
48AQI
23rd March 2025
57AQI
57AQI
24th March 2025
63AQI
63AQI
25th March 2025
74AQI
74AQI
26th March 2025
77AQI
77AQI
27th March 2025
74AQI
74AQI
28th March 2025
59AQI
59AQI
29th March 2025
37AQI
37AQI
30th March 2025
41AQI
41AQI
31st March 2025
33AQI
33AQI
1st April 2025
36AQI
36AQI
2nd April 2025
22AQI
22AQI
3rd April 2025
25AQI
25AQI
4th April 2025
22AQI
22AQI
5th April 2025
31AQI
31AQI
6th April 2025
27AQI
27AQI
7th April 2025
35AQI
35AQI
8th April 2025
41AQI
41AQI
9th April 2025
30AQI
30AQI
10th April 2025
48AQI
48AQI
11th April 2025
43AQI
43AQI
12th April 2025
45AQI
45AQI
13th April 2025
32AQI
32AQI
14th April 2025
30AQI
30AQI
15th April 2025
26AQI
26AQI
16th April 2025
28AQI
28AQI
17th April 2025
45AQI
45AQI
18th April 2025
55AQI
55AQI
19th April 2025
68AQI
68AQI
20th April 2025
63AQI
63AQI
21st April 2025
46AQI
46AQI
22nd April 2025
55AQI
55AQI
23rd April 2025
36AQI
36AQI
24th April 2025
46AQI
46AQI
25th April 2025
43AQI
43AQI
26th April 2025
52AQI
52AQI
27th April 2025
51AQI
51AQI
28th April 2025
56AQI
56AQI
29th April 2025
40AQI
40AQI
30th April 2025
50AQI
50AQI
1st May 2025
45AQI
45AQI
2nd May 2025
34AQI
34AQI
3rd May 2025
34AQI
34AQI
4th May 2025
38AQI
38AQI
5th May 2025
35AQI
35AQI
6th May 2025
33AQI
33AQI
7th May 2025
27AQI
27AQI
8th May 2025
34AQI
34AQI
9th May 2025
35AQI
35AQI
10th May 2025
25AQI
25AQI
11th May 2025
24AQI
24AQI
12th May 2025
24AQI
24AQI
13th May 2025
37AQI
37AQI
14th May 2025
42AQI
42AQI
15th May 2025
42AQI
42AQI
16th May 2025
48AQI
48AQI
17th May 2025
33AQI
33AQI
18th May 2025
44AQI
44AQI
19th May 2025
47AQI
47AQI
20th May 2025
58AQI
58AQI
21st May 2025
66AQI
66AQI
22nd May 2025
56AQI
56AQI
23rd May 2025
53AQI
53AQI
24th May 2025
50AQI
50AQI
25th May 2025
36AQI
36AQI
26th May 2025
34AQI
34AQI
27th May 2025
32AQI
32AQI
28th May 2025
31AQI
31AQI
29th May 2025
36AQI
36AQI
30th May 2025
32AQI
32AQI
31st May 2025
24AQI
24AQI
1st June 2025
24AQI
24AQI
2nd June 2025
33AQI
33AQI
3rd June 2025
37AQI
37AQI
4th June 2025
29AQI
29AQI
5th June 2025
41AQI
41AQI
6th June 2025
45AQI
45AQI
7th June 2025
53AQI
53AQI
8th June 2025
63AQI
63AQI
9th June 2025
57AQI
57AQI
10th June 2025
42AQI
42AQI
11th June 2025
37AQI
37AQI
12th June 2025
41AQI
41AQI
13th June 2025
49AQI
49AQI
14th June 2025
41AQI
41AQI
15th June 2025
30AQI
30AQI
16th June 2025
36AQI
36AQI
17th June 2025
47AQI
47AQI
18th June 2025
45AQI
45AQI
19th June 2025
47AQI
47AQI
20th June 2025
46AQI
46AQI
21st June 2025
42AQI
42AQI
22nd June 2025
34AQI
34AQI
23rd June 2025
35AQI
35AQI
24th June 2025
33AQI
33AQI
25th June 2025
29AQI
29AQI
26th June 2025
30AQI
30AQI
27th June 2025
33AQI
33AQI
28th June 2025
34AQI
34AQI
29th June 2025
39AQI
39AQI
30th June 2025
43AQI
43AQI
1st July 2025
45AQI
45AQI
2nd July 2025
45AQI
45AQI
3rd July 2025
48AQI
48AQI
4th July 2025
47AQI
47AQI
5th July 2025
49AQI
49AQI
6th July 2025
54AQI
54AQI
7th July 2025
70AQI
70AQI
8th July 2025
74AQI
74AQI
9th July 2025
76AQI
76AQI
10th July 2025
64AQI
64AQI
11th July 2025
54AQI
54AQI
12th July 2025
55AQI
55AQI
13th July 2025
55AQI
55AQI
14th July 2025
47AQI
47AQI
15th July 2025
45AQI
45AQI
16th July 2025
45AQI
45AQI
17th July 2025
43AQI
43AQI
18th July 2025
42AQI
42AQI
19th July 2025
37AQI
37AQI
20th July 2025
37AQI
37AQI
21st July 2025
40AQI
40AQI
22nd July 2025
41AQI
41AQI
23rd July 2025
46AQI
46AQI
24th July 2025
46AQI
46AQI
25th July 2025
46AQI
46AQI
26th July 2025
47AQI
47AQI
27th July 2025
44AQI
44AQI
28th July 2025
46AQI
46AQI
29th July 2025
43AQI
43AQI
30th July 2025
35AQI
35AQI
31st July 2025
37AQI
37AQI
1st August 2025
34AQI
34AQI
2nd August 2025
39AQI
39AQI
3rd August 2025
44AQI
44AQI
4th August 2025
57AQI
57AQI
5th August 2025
49AQI
49AQI
6th August 2025
49AQI
49AQI
7th August 2025
40AQI
40AQI
8th August 2025
37AQI
37AQI
9th August 2025
40AQI
40AQI
10th August 2025
37AQI
37AQI
11th August 2025
36AQI
36AQI
12th August 2025
33AQI
33AQI
13th August 2025
32AQI
32AQI
14th August 2025
32AQI
32AQI
15th August 2025
33AQI
33AQI
16th August 2025
34AQI
34AQI
17th August 2025
38AQI
38AQI
18th August 2025
41AQI
41AQI
19th August 2025
43AQI
43AQI
20th August 2025
48AQI
48AQI
21st August 2025
48AQI
48AQI
22nd August 2025
48AQI
48AQI
23rd August 2025
48AQI
48AQI
24th August 2025
54AQI
54AQI
25th August 2025
55AQI
55AQI
26th August 2025
53AQI
53AQI
27th August 2025
49AQI
49AQI
28th August 2025
46AQI
46AQI
29th August 2025
50AQI
50AQI
30th August 2025
52AQI
52AQI
31st August 2025
52AQI
52AQI
1st September 2025
43AQI
43AQI
2nd September 2025
37AQI
37AQI
3rd September 2025
35AQI
35AQI
4th September 2025
33AQI
33AQI
5th September 2025
26AQI
26AQI
6th September 2025
28AQI
28AQI
7th September 2025
30AQI
30AQI
8th September 2025
34AQI
34AQI
9th September 2025
38AQI
38AQI
10th September 2025
34AQI
34AQI
11th September 2025
29AQI
29AQI
12th September 2025
29AQI
29AQI
13th September 2025
26AQI
26AQI
14th September 2025
30AQI
30AQI
15th September 2025
33AQI
33AQI
16th September 2025
41AQI
41AQI
17th September 2025
45AQI
45AQI
18th September 2025
41AQI
41AQI
19th September 2025
34AQI
34AQI
20th September 2025
33AQI
33AQI
21st September 2025
28AQI
28AQI
22nd September 2025
30AQI
30AQI
23rd September 2025
29AQI
29AQI
24th September 2025
30AQI
30AQI
25th September 2025
45AQI
45AQI
26th September 2025
55AQI
55AQI
27th September 2025
43AQI
43AQI
28th September 2025
44AQI
44AQI
29th September 2025
29AQI
29AQI
30th September 2025
25AQI
25AQI
1st October 2025
36AQI
36AQI
2nd October 2025
45AQI
45AQI
3rd October 2025
57AQI
57AQI
4th October 2025
70AQI
70AQI
5th October 2025
61AQI
61AQI
6th October 2025
58AQI
58AQI
7th October 2025
60AQI
60AQI
8th October 2025
64AQI
64AQI
9th October 2025
54AQI
54AQI
10th October 2025
49AQI
49AQI
11th October 2025
63AQI
63AQI
12th October 2025
54AQI
54AQI
13th October 2025
65AQI
65AQI
14th October 2025
63AQI
63AQI
15th October 2025
60AQI
60AQI
16th October 2025
62AQI
62AQI
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
36AQI
36AQI
44AQI
41AQI
38AQI
40AQI
48AQI
44AQI
35AQI
58AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202541AQI
29
2
27
1
21
10
23
7
27
4
27
3
23
8
25
6
29
1
3
13
234
55
Highest AQI recorded in
October58AQI
Lowest AQI recorded in
September35AQI
202440AQI
28
3
26
3
25
6
15
15
25
6
24
6
19
12
30
1
28
2
28
3
25
5
30
1
303
63
Highest AQI recorded in
April53AQI
Lowest AQI recorded in
August32AQI
202342AQI
25
6
21
7
18
13
14
16
22
9
22
8
21
10
31
30
28
3
19
10
23
8
274
90
Highest AQI recorded in
April51AQI
Lowest AQI recorded in
August28AQI
202240AQI
29
2
18
4
19
12
17
12
24
7
20
10
19
2
1
27
1
25
6
21
9
31
250
66
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
December31AQI
202139AQI
23
8
22
6
20
10
1
25
5
25
6
23
7
29
2
27
4
28
2
24
7
20
10
27
4
293
71
1
Highest AQI recorded in
March46AQI
Lowest AQI recorded in
August33AQI
202037AQI
9
4
17
4
18
23
7
30
1
23
8
19
25
6
16
14
24
7
204
51
Highest AQI recorded in
November46AQI
Lowest AQI recorded in
September27AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
42AQILeast Polluted Year Recorded
2020(Avg.)
37AQIKoizuka's annual 2025 AQI (41) shows an average percentage change of 4.4% (worsened AQI) compared to previous years: 2020 (37), 2021 (39), 2022 (40), 2023 (42), 2024 (40).
