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+
August Air Quality Analysis
Koizuka, Kumagaya, Saitama, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
28th Aug 2021
61AQILowest AQI recorded on
8th Aug 2021
13AQISame Day Analysis (8th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 40 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 8th Aug - 9th Aug 2025
Koizuka, Kumagaya, Saitama, Japan
AQI
Day
Night
.
4 AM8th Aug 2025
6 PM
3 AM9th Aug 2025
Day time
Avg. Highest Time
4AM8th Aug
46AQI
Avg. Lowest Time
11AM8th Aug
24AQI
Night time
Avg. Highest Time
2AM9th Aug
45AQI
Avg. Lowest Time
12AM9th Aug
36AQI
In the last 24 hours,
Koizuka's AQI reached its highest point of 46 at 4 AM during the Day, while the lowest point, 24, was recorded at 11 AM during the Day between 8th Aug and 9th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Koizuka, Kumagaya, Saitama, Japan
JulAug
10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th
Day
Night
10th Jul 2025704 AMAQI
10th Jul 2025745 AMAQI
10th Jul 2025736 AMAQI
10th Jul 2025727 AMAQI
10th Jul 2025748 AMAQI
10th Jul 2025489 AMAQI
10th Jul 20254510 AMAQI
10th Jul 20256011 AMAQI
10th Jul 20257012 PMAQI
10th Jul 2025711 PMAQI
10th Jul 2025702 PMAQI
10th Jul 2025683 PMAQI
10th Jul 2025684 PMAQI
10th Jul 2025585 PMAQI
10th Jul 2025546 PMAQI
10th Jul 2025477 PMAQI
10th Jul 2025508 PMAQI
10th Jul 2025629 PMAQI
10th Jul 20256210 PMAQI
10th Jul 20256211 PMAQI
11th Jul 20256212 AMAQI
11th Jul 2025661 AMAQI
11th Jul 2025692 AMAQI
11th Jul 2025693 AMAQI
29°C24/36°C
11th Jul 2025694 AMAQI
11th Jul 2025685 AMAQI
11th Jul 2025686 AMAQI
11th Jul 2025687 AMAQI
11th Jul 2025688 AMAQI
11th Jul 2025299 AMAQI
11th Jul 20251610 AMAQI
11th Jul 20251611 AMAQI
11th Jul 20252112 PMAQI
11th Jul 2025391 PMAQI
11th Jul 2025382 PMAQI
11th Jul 2025413 PMAQI
11th Jul 2025434 PMAQI
11th Jul 2025465 PMAQI
11th Jul 2025456 PMAQI
11th Jul 2025427 PMAQI
11th Jul 2025488 PMAQI
11th Jul 2025609 PMAQI
11th Jul 20256010 PMAQI
11th Jul 20256111 PMAQI
12th Jul 20256012 AMAQI
12th Jul 2025621 AMAQI
12th Jul 2025652 AMAQI
12th Jul 2025653 AMAQI
23°C22/23°C
12th Jul 2025644 AMAQI
12th Jul 2025625 AMAQI
12th Jul 2025626 AMAQI
12th Jul 2025637 AMAQI
12th Jul 2025638 AMAQI
12th Jul 2025389 AMAQI
12th Jul 20252710 AMAQI
12th Jul 20252811 AMAQI
12th Jul 20253612 PMAQI
12th Jul 2025481 PMAQI
12th Jul 2025512 PMAQI
12th Jul 2025513 PMAQI
12th Jul 2025534 PMAQI
12th Jul 2025535 PMAQI
12th Jul 2025526 PMAQI
12th Jul 2025497 PMAQI
12th Jul 2025528 PMAQI
12th Jul 2025589 PMAQI
12th Jul 20255810 PMAQI
12th Jul 20255811 PMAQI
13th Jul 20255812 AMAQI
13th Jul 2025591 AMAQI
13th Jul 2025622 AMAQI
13th Jul 2025613 AMAQI
25°C22/29°C
13th Jul 2025614 AMAQI
13th Jul 2025605 AMAQI
13th Jul 2025596 AMAQI
13th Jul 2025607 AMAQI
13th Jul 2025608 AMAQI
13th Jul 2025449 AMAQI
13th Jul 20253810 AMAQI
13th Jul 20253911 AMAQI
13th Jul 20254412 PMAQI
13th Jul 2025521 PMAQI
13th Jul 2025522 PMAQI
13th Jul 2025543 PMAQI
13th Jul 2025544 PMAQI
13th Jul 2025565 PMAQI
13th Jul 2025566 PMAQI
13th Jul 2025537 PMAQI
13th Jul 2025538 PMAQI
13th Jul 2025569 PMAQI
13th Jul 20255610 PMAQI
13th Jul 20255511 PMAQI
14th Jul 20255512 AMAQI
14th Jul 2025571 AMAQI
14th Jul 2025592 AMAQI
14th Jul 2025583 AMAQI
27°C23/32°C
14th Jul 2025584 AMAQI
14th Jul 2025585 AMAQI
14th Jul 2025576 AMAQI
14th Jul 2025587 AMAQI
14th Jul 2025588 AMAQI
14th Jul 2025309 AMAQI
14th Jul 20251710 AMAQI
14th Jul 20252111 AMAQI
14th Jul 20252512 PMAQI
14th Jul 2025341 PMAQI
14th Jul 2025342 PMAQI
14th Jul 2025363 PMAQI
14th Jul 2025354 PMAQI
14th Jul 2025385 PMAQI
14th Jul 2025366 PMAQI
14th Jul 2025397 PMAQI
14th Jul 2025428 PMAQI
14th Jul 2025539 PMAQI
14th Jul 20255210 PMAQI
14th Jul 20255311 PMAQI
15th Jul 20255312 AMAQI
15th Jul 2025541 AMAQI
15th Jul 2025562 AMAQI
15th Jul 2025563 AMAQI
26°C24/29°C
15th Jul 2025564 AMAQI
15th Jul 2025555 AMAQI
15th Jul 2025546 AMAQI
15th Jul 2025557 AMAQI
15th Jul 2025548 AMAQI
15th Jul 2025269 AMAQI
15th Jul 20251910 AMAQI
15th Jul 20251611 AMAQI
15th Jul 20252112 PMAQI
15th Jul 2025341 PMAQI
15th Jul 2025342 PMAQI
15th Jul 2025353 PMAQI
15th Jul 2025364 PMAQI
15th Jul 2025335 PMAQI
15th Jul 2025346 PMAQI
15th Jul 2025337 PMAQI
15th Jul 2025368 PMAQI
15th Jul 2025519 PMAQI
15th Jul 20255210 PMAQI
15th Jul 20255111 PMAQI
16th Jul 20255112 AMAQI
16th Jul 2025531 AMAQI
16th Jul 2025542 AMAQI
16th Jul 2025543 AMAQI
28°C26/33°C
16th Jul 2025544 AMAQI
16th Jul 2025535 AMAQI
16th Jul 2025536 AMAQI
16th Jul 2025537 AMAQI
16th Jul 2025538 AMAQI
16th Jul 2025349 AMAQI
16th Jul 20255010 AMAQI
16th Jul 20254911 AMAQI
16th Jul 20253912 PMAQI
16th Jul 2025381 PMAQI
16th Jul 2025362 PMAQI
16th Jul 2025323 PMAQI
16th Jul 2025334 PMAQI
16th Jul 2025355 PMAQI
16th Jul 2025356 PMAQI
16th Jul 2025287 PMAQI
16th Jul 2025328 PMAQI
16th Jul 2025479 PMAQI
16th Jul 20254810 PMAQI
16th Jul 20254611 PMAQI
17th Jul 20254712 AMAQI
17th Jul 2025501 AMAQI
17th Jul 2025522 AMAQI
17th Jul 2025523 AMAQI
29°C25/34°C
17th Jul 2025524 AMAQI
17th Jul 2025505 AMAQI
17th Jul 2025506 AMAQI
17th Jul 2025507 AMAQI
17th Jul 2025508 AMAQI
17th Jul 2025239 AMAQI
17th Jul 20251510 AMAQI
17th Jul 20252311 AMAQI
17th Jul 20253112 PMAQI
17th Jul 2025371 PMAQI
17th Jul 2025352 PMAQI
17th Jul 2025363 PMAQI
17th Jul 2025374 PMAQI
17th Jul 2025365 PMAQI
17th Jul 2025386 PMAQI
17th Jul 2025417 PMAQI
17th Jul 2025438 PMAQI
17th Jul 2025469 PMAQI
17th Jul 20254410 PMAQI
17th Jul 20254411 PMAQI
18th Jul 20254512 AMAQI
18th Jul 2025481 AMAQI
18th Jul 2025492 AMAQI
18th Jul 2025493 AMAQI
29°C26/33°C
18th Jul 2025484 AMAQI
18th Jul 2025465 AMAQI
18th Jul 2025486 AMAQI
18th Jul 2025467 AMAQI
18th Jul 2025478 AMAQI
18th Jul 2025339 AMAQI
18th Jul 20252910 AMAQI
18th Jul 20253811 AMAQI
18th Jul 20253612 PMAQI
18th Jul 2025401 PMAQI
18th Jul 2025362 PMAQI
18th Jul 2025343 PMAQI
18th Jul 2025344 PMAQI
18th Jul 2025315 PMAQI
18th Jul 2025336 PMAQI
18th Jul 2025357 PMAQI
18th Jul 2025368 PMAQI
18th Jul 2025429 PMAQI
18th Jul 20254310 PMAQI
18th Jul 20254311 PMAQI
19th Jul 20254312 AMAQI
19th Jul 2025441 AMAQI
19th Jul 2025472 AMAQI
19th Jul 2025473 AMAQI
29°C25/34°C
19th Jul 2025464 AMAQI
19th Jul 2025445 AMAQI
19th Jul 2025456 AMAQI
19th Jul 2025467 AMAQI
19th Jul 2025468 AMAQI
19th Jul 2025319 AMAQI
19th Jul 20252710 AMAQI
19th Jul 20253111 AMAQI
19th Jul 20253312 PMAQI
19th Jul 2025341 PMAQI
19th Jul 2025322 PMAQI
19th Jul 2025283 PMAQI
19th Jul 2025264 PMAQI
19th Jul 2025245 PMAQI
19th Jul 2025306 PMAQI
19th Jul 2025307 PMAQI
19th Jul 2025348 PMAQI
19th Jul 2025389 PMAQI
19th Jul 20253610 PMAQI
19th Jul 20253511 PMAQI
20th Jul 20253612 AMAQI
20th Jul 2025391 AMAQI
20th Jul 2025442 AMAQI
20th Jul 2025443 AMAQI
30°C26/35°C
20th Jul 2025444 AMAQI
20th Jul 2025435 AMAQI
20th Jul 2025436 AMAQI
20th Jul 2025427 AMAQI
20th Jul 2025428 AMAQI
20th Jul 2025349 AMAQI
20th Jul 20252610 AMAQI
20th Jul 20253511 AMAQI
20th Jul 20253612 PMAQI
20th Jul 2025321 PMAQI
20th Jul 2025342 PMAQI
20th Jul 2025323 PMAQI
20th Jul 2025374 PMAQI
20th Jul 2025405 PMAQI
20th Jul 2025316 PMAQI
20th Jul 2025327 PMAQI
20th Jul 2025338 PMAQI
20th Jul 2025379 PMAQI
20th Jul 20253810 PMAQI
20th Jul 20253711 PMAQI
21st Jul 20253612 AMAQI
21st Jul 2025361 AMAQI
21st Jul 2025422 AMAQI
21st Jul 2025423 AMAQI
31°C27/37°C
21st Jul 2025424 AMAQI
21st Jul 2025405 AMAQI
21st Jul 2025406 AMAQI
21st Jul 2025417 AMAQI
21st Jul 2025408 AMAQI
21st Jul 2025269 AMAQI
21st Jul 20253410 AMAQI
21st Jul 20253911 AMAQI
21st Jul 20254212 PMAQI
21st Jul 2025441 PMAQI
21st Jul 2025412 PMAQI
21st Jul 2025453 PMAQI
21st Jul 2025464 PMAQI
21st Jul 2025485 PMAQI
21st Jul 2025506 PMAQI
21st Jul 2025417 PMAQI
21st Jul 2025388 PMAQI
21st Jul 2025389 PMAQI
21st Jul 20253510 PMAQI
21st Jul 20253411 PMAQI
22nd Jul 20253412 AMAQI
22nd Jul 2025361 AMAQI
22nd Jul 2025402 AMAQI
22nd Jul 2025403 AMAQI
32°C27/38°C
22nd Jul 2025404 AMAQI
22nd Jul 2025405 AMAQI
22nd Jul 2025396 AMAQI
22nd Jul 2025397 AMAQI
22nd Jul 2025408 AMAQI
22nd Jul 2025299 AMAQI
22nd Jul 20253510 AMAQI
22nd Jul 20254811 AMAQI
22nd Jul 20255012 PMAQI
22nd Jul 2025501 PMAQI
22nd Jul 2025402 PMAQI
22nd Jul 2025463 PMAQI
22nd Jul 2025504 PMAQI
22nd Jul 2025545 PMAQI
22nd Jul 2025506 PMAQI
22nd Jul 2025417 PMAQI
22nd Jul 2025418 PMAQI
22nd Jul 2025389 PMAQI
22nd Jul 20253710 PMAQI
22nd Jul 20253311 PMAQI
23rd Jul 20253212 AMAQI
23rd Jul 2025341 AMAQI
23rd Jul 2025392 AMAQI
23rd Jul 2025393 AMAQI
33°C28/38°C
23rd Jul 2025394 AMAQI
23rd Jul 2025395 AMAQI
23rd Jul 2025406 AMAQI
23rd Jul 2025407 AMAQI
23rd Jul 2025408 AMAQI
23rd Jul 2025349 AMAQI
23rd Jul 20254710 AMAQI
23rd Jul 20255811 AMAQI
23rd Jul 20255912 PMAQI
23rd Jul 2025581 PMAQI
23rd Jul 2025572 PMAQI
23rd Jul 2025573 PMAQI
23rd Jul 2025604 PMAQI
23rd Jul 2025585 PMAQI
23rd Jul 2025546 PMAQI
23rd Jul 2025547 PMAQI
23rd Jul 2025528 PMAQI
23rd Jul 2025469 PMAQI
23rd Jul 20254210 PMAQI
23rd Jul 20253611 PMAQI
24th Jul 20253612 AMAQI
24th Jul 2025371 AMAQI
24th Jul 2025382 AMAQI
24th Jul 2025383 AMAQI
32°C27/38°C
24th Jul 2025404 AMAQI
24th Jul 2025425 AMAQI
24th Jul 2025426 AMAQI
24th Jul 2025437 AMAQI
24th Jul 2025428 AMAQI
24th Jul 2025509 AMAQI
24th Jul 20255210 AMAQI
24th Jul 20255511 AMAQI
24th Jul 20255512 PMAQI
24th Jul 2025551 PMAQI
24th Jul 2025542 PMAQI
24th Jul 2025553 PMAQI
24th Jul 2025614 PMAQI
24th Jul 2025595 PMAQI
24th Jul 2025546 PMAQI
24th Jul 2025497 PMAQI
24th Jul 2025438 PMAQI
24th Jul 2025409 PMAQI
24th Jul 20254010 PMAQI
24th Jul 20253711 PMAQI
25th Jul 20253812 AMAQI
25th Jul 2025401 AMAQI
25th Jul 2025402 AMAQI
25th Jul 2025393 AMAQI
32°C27/38°C
25th Jul 2025424 AMAQI
25th Jul 2025445 AMAQI
25th Jul 2025456 AMAQI
25th Jul 2025447 AMAQI
25th Jul 2025448 AMAQI
25th Jul 2025409 AMAQI
25th Jul 20254410 AMAQI
25th Jul 20255811 AMAQI
25th Jul 20255812 PMAQI
25th Jul 2025561 PMAQI
25th Jul 2025572 PMAQI
25th Jul 2025583 PMAQI
25th Jul 2025604 PMAQI
25th Jul 2025545 PMAQI
25th Jul 2025506 PMAQI
25th Jul 2025437 PMAQI
25th Jul 2025458 PMAQI
25th Jul 2025449 PMAQI
25th Jul 20253810 PMAQI
25th Jul 20253711 PMAQI
26th Jul 20253812 AMAQI
26th Jul 2025391 AMAQI
26th Jul 2025422 AMAQI
26th Jul 2025433 AMAQI
32°C28/39°C
26th Jul 2025434 AMAQI
26th Jul 2025465 AMAQI
26th Jul 2025456 AMAQI
26th Jul 2025467 AMAQI
26th Jul 2025468 AMAQI
26th Jul 2025529 AMAQI
26th Jul 20255710 AMAQI
26th Jul 20256011 AMAQI
26th Jul 20256012 PMAQI
26th Jul 2025561 PMAQI
26th Jul 2025542 PMAQI
26th Jul 2025553 PMAQI
26th Jul 2025604 PMAQI
26th Jul 2025545 PMAQI
26th Jul 2025346 PMAQI
26th Jul 2025387 PMAQI
26th Jul 2025468 PMAQI
26th Jul 2025469 PMAQI
26th Jul 20254310 PMAQI
26th Jul 20254411 PMAQI
27th Jul 20254212 AMAQI
27th Jul 2025411 AMAQI
27th Jul 2025432 AMAQI
27th Jul 2025433 AMAQI
32°C27/39°C
27th Jul 2025464 AMAQI
27th Jul 2025485 AMAQI
27th Jul 2025486 AMAQI
27th Jul 2025487 AMAQI
27th Jul 2025478 AMAQI
27th Jul 2025479 AMAQI
27th Jul 20255110 AMAQI
27th Jul 20255311 AMAQI
27th Jul 20255412 PMAQI
27th Jul 2025531 PMAQI
27th Jul 2025532 PMAQI
27th Jul 2025523 PMAQI
27th Jul 2025464 PMAQI
27th Jul 2025515 PMAQI
27th Jul 2025366 PMAQI
27th Jul 2025327 PMAQI
27th Jul 2025348 PMAQI
27th Jul 2025389 PMAQI
27th Jul 20253610 PMAQI
27th Jul 20253411 PMAQI
28th Jul 20253412 AMAQI
28th Jul 2025401 AMAQI
28th Jul 2025472 AMAQI
28th Jul 2025463 AMAQI
33°C28/38°C
28th Jul 2025464 AMAQI
28th Jul 2025485 AMAQI
28th Jul 2025476 AMAQI
28th Jul 2025487 AMAQI
28th Jul 2025478 AMAQI
28th Jul 2025329 AMAQI
28th Jul 20253810 AMAQI
28th Jul 20255111 AMAQI
28th Jul 20254812 PMAQI
28th Jul 2025481 PMAQI
28th Jul 2025432 PMAQI
28th Jul 2025503 PMAQI
28th Jul 2025514 PMAQI
28th Jul 2025505 PMAQI
28th Jul 2025526 PMAQI
28th Jul 2025557 PMAQI
28th Jul 2025528 PMAQI
28th Jul 2025469 PMAQI
28th Jul 20254210 PMAQI
28th Jul 20254111 PMAQI
29th Jul 20254312 AMAQI
29th Jul 2025421 AMAQI
29th Jul 2025442 AMAQI
29th Jul 2025433 AMAQI
33°C28/38°C
29th Jul 2025444 AMAQI
29th Jul 2025455 AMAQI
29th Jul 2025456 AMAQI
29th Jul 2025457 AMAQI
29th Jul 2025458 AMAQI
29th Jul 2025319 AMAQI
29th Jul 20253610 AMAQI
29th Jul 20254911 AMAQI
29th Jul 20255212 PMAQI
29th Jul 2025441 PMAQI
29th Jul 2025472 PMAQI
29th Jul 2025483 PMAQI
29th Jul 2025524 PMAQI
29th Jul 2025525 PMAQI
29th Jul 2025476 PMAQI
29th Jul 2025447 PMAQI
29th Jul 2025408 PMAQI
29th Jul 2025409 PMAQI
29th Jul 20253610 PMAQI
29th Jul 20253411 PMAQI
30th Jul 20253312 AMAQI
30th Jul 2025361 AMAQI
30th Jul 2025442 AMAQI
30th Jul 2025443 AMAQI
33°C28/39°C
30th Jul 2025444 AMAQI
30th Jul 2025445 AMAQI
30th Jul 2025466 AMAQI
30th Jul 2025447 AMAQI
30th Jul 2025448 AMAQI
30th Jul 2025249 AMAQI
30th Jul 20251410 AMAQI
30th Jul 20251911 AMAQI
30th Jul 20252212 PMAQI
30th Jul 2025251 PMAQI
30th Jul 2025242 PMAQI
30th Jul 2025253 PMAQI
30th Jul 2025324 PMAQI
30th Jul 2025365 PMAQI
30th Jul 2025346 PMAQI
30th Jul 2025387 PMAQI
30th Jul 2025398 PMAQI
30th Jul 2025389 PMAQI
30th Jul 20253810 PMAQI
30th Jul 20253711 PMAQI
31st Jul 20253812 AMAQI
31st Jul 2025391 AMAQI
31st Jul 2025442 AMAQI
31st Jul 2025423 AMAQI
31°C27/37°C
31st Jul 2025424 AMAQI
31st Jul 2025425 AMAQI
31st Jul 2025426 AMAQI
31st Jul 2025427 AMAQI
31st Jul 2025428 AMAQI
31st Jul 2025429 AMAQI
31st Jul 20254210 AMAQI
31st Jul 20254411 AMAQI
31st Jul 20254412 PMAQI
31st Jul 2025381 PMAQI
31st Jul 2025342 PMAQI
31st Jul 2025343 PMAQI
31st Jul 2025344 PMAQI
31st Jul 2025345 PMAQI
31st Jul 2025316 PMAQI
31st Jul 2025327 PMAQI
31st Jul 2025328 PMAQI
31st Jul 2025289 PMAQI
31st Jul 20253410 PMAQI
31st Jul 20252811 PMAQI
1st Aug 20253012 AMAQI
1st Aug 2025331 AMAQI
1st Aug 2025332 AMAQI
1st Aug 2025363 AMAQI
30°C26/36°C
1st Aug 2025374 AMAQI
1st Aug 2025365 AMAQI
1st Aug 2025366 AMAQI
1st Aug 2025357 AMAQI
1st Aug 2025378 AMAQI
1st Aug 2025379 AMAQI
1st Aug 20253410 AMAQI
1st Aug 20253911 AMAQI
1st Aug 20254512 PMAQI
1st Aug 2025361 PMAQI
1st Aug 2025322 PMAQI
1st Aug 2025303 PMAQI
1st Aug 2025434 PMAQI
1st Aug 2025385 PMAQI
1st Aug 2025426 PMAQI
1st Aug 2025267 PMAQI
1st Aug 2025298 PMAQI
1st Aug 2025299 PMAQI
1st Aug 20253410 PMAQI
1st Aug 20252911 PMAQI
2nd Aug 20253012 AMAQI
2nd Aug 2025351 AMAQI
2nd Aug 2025392 AMAQI
2nd Aug 2025393 AMAQI
28°C26/32°C
2nd Aug 2025404 AMAQI
2nd Aug 2025385 AMAQI
2nd Aug 2025406 AMAQI
2nd Aug 2025387 AMAQI
2nd Aug 2025398 AMAQI
2nd Aug 2025339 AMAQI
2nd Aug 20253810 AMAQI
2nd Aug 20254411 AMAQI
2nd Aug 20253212 PMAQI
2nd Aug 2025351 PMAQI
2nd Aug 2025482 PMAQI
2nd Aug 2025503 PMAQI
2nd Aug 2025394 PMAQI
2nd Aug 2025415 PMAQI
2nd Aug 2025436 PMAQI
2nd Aug 2025487 PMAQI
2nd Aug 2025398 PMAQI
2nd Aug 2025389 PMAQI
2nd Aug 20253610 PMAQI
2nd Aug 20254411 PMAQI
3rd Aug 20253412 AMAQI
3rd Aug 2025361 AMAQI
3rd Aug 2025372 AMAQI
3rd Aug 2025383 AMAQI
32°C26/39°C
3rd Aug 2025404 AMAQI
3rd Aug 2025405 AMAQI
3rd Aug 2025396 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025398 AMAQI
3rd Aug 2025429 AMAQI
3rd Aug 20255110 AMAQI
3rd Aug 20255211 AMAQI
3rd Aug 20255712 PMAQI
3rd Aug 2025531 PMAQI
3rd Aug 2025542 PMAQI
3rd Aug 2025523 PMAQI
3rd Aug 2025464 PMAQI
3rd Aug 2025485 PMAQI
3rd Aug 2025506 PMAQI
3rd Aug 2025467 PMAQI
3rd Aug 2025448 PMAQI
3rd Aug 2025419 PMAQI
3rd Aug 20253910 PMAQI
3rd Aug 20254011 PMAQI
4th Aug 20253812 AMAQI
4th Aug 2025381 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025403 AMAQI
32°C28/38°C
4th Aug 2025414 AMAQI
4th Aug 2025425 AMAQI
4th Aug 2025426 AMAQI
4th Aug 2025437 AMAQI
4th Aug 2025438 AMAQI
4th Aug 2025589 AMAQI
4th Aug 20256010 AMAQI
4th Aug 20257211 AMAQI
4th Aug 20257112 PMAQI
4th Aug 2025721 PMAQI
4th Aug 2025782 PMAQI
4th Aug 2025723 PMAQI
4th Aug 2025794 PMAQI
4th Aug 2025905 PMAQI
4th Aug 2025736 PMAQI
4th Aug 2025717 PMAQI
4th Aug 2025648 PMAQI
4th Aug 2025589 PMAQI
4th Aug 20255510 PMAQI
4th Aug 20254811 PMAQI
5th Aug 20255412 AMAQI
5th Aug 2025411 AMAQI
5th Aug 2025422 AMAQI
5th Aug 2025403 AMAQI
33°C28/39°C
5th Aug 2025504 AMAQI
5th Aug 2025525 AMAQI
5th Aug 2025526 AMAQI
5th Aug 2025517 AMAQI
5th Aug 2025538 AMAQI
5th Aug 2025589 AMAQI
5th Aug 20256010 AMAQI
5th Aug 20255611 AMAQI
5th Aug 20256212 PMAQI
5th Aug 2025551 PMAQI
5th Aug 2025522 PMAQI
5th Aug 2025513 PMAQI
5th Aug 2025584 PMAQI
5th Aug 2025485 PMAQI
5th Aug 2025536 PMAQI
5th Aug 2025427 PMAQI
5th Aug 2025428 PMAQI
5th Aug 2025459 PMAQI
5th Aug 20254610 PMAQI
5th Aug 20254011 PMAQI
6th Aug 20254212 AMAQI
6th Aug 2025501 AMAQI
6th Aug 2025502 AMAQI
6th Aug 2025483 AMAQI
34°C29/40°C
6th Aug 2025514 AMAQI
6th Aug 2025525 AMAQI
6th Aug 2025506 AMAQI
6th Aug 2025517 AMAQI
6th Aug 2025528 AMAQI
6th Aug 2025409 AMAQI
6th Aug 20254610 AMAQI
6th Aug 20253911 AMAQI
6th Aug 20254812 PMAQI
6th Aug 2025501 PMAQI
6th Aug 2025542 PMAQI
6th Aug 2025503 PMAQI
6th Aug 2025444 PMAQI
6th Aug 2025505 PMAQI
6th Aug 2025446 PMAQI
6th Aug 2025547 PMAQI
6th Aug 2025528 PMAQI
6th Aug 2025479 PMAQI
6th Aug 20255110 PMAQI
6th Aug 20254711 PMAQI
7th Aug 20254212 AMAQI
7th Aug 2025461 AMAQI
7th Aug 2025482 AMAQI
7th Aug 2025473 AMAQI
33°C28/39°C
7th Aug 2025464 AMAQI
7th Aug 2025475 AMAQI
7th Aug 2025466 AMAQI
7th Aug 2025447 AMAQI
7th Aug 2025448 AMAQI
7th Aug 2025389 AMAQI
7th Aug 20253510 AMAQI
7th Aug 20254311 AMAQI
7th Aug 20253312 PMAQI
7th Aug 2025311 PMAQI
7th Aug 2025252 PMAQI
7th Aug 2025203 PMAQI
7th Aug 2025264 PMAQI
7th Aug 2025285 PMAQI
7th Aug 2025356 PMAQI
7th Aug 2025377 PMAQI
7th Aug 2025418 PMAQI
7th Aug 2025449 PMAQI
7th Aug 20254210 PMAQI
7th Aug 20254311 PMAQI
8th Aug 20254112 AMAQI
8th Aug 2025431 AMAQI
8th Aug 2025462 AMAQI
8th Aug 2025473 AMAQI
30°C28/33°C
8th Aug 2025464 AMAQI
8th Aug 2025425 AMAQI
8th Aug 2025426 AMAQI
8th Aug 2025427 AMAQI
8th Aug 2025428 AMAQI
8th Aug 2025279 AMAQI
8th Aug 20252510 AMAQI
8th Aug 20252411 AMAQI
8th Aug 20252512 PMAQI
8th Aug 2025281 PMAQI
8th Aug 2025252 PMAQI
8th Aug 2025293 PMAQI
8th Aug 2025344 PMAQI
8th Aug 2025335 PMAQI
8th Aug 2025416 PMAQI
8th Aug 2025447 PMAQI
8th Aug 2025378 PMAQI
8th Aug 2025389 PMAQI
8th Aug 20253610 PMAQI
8th Aug 20253611 PMAQI
9th Aug 20253612 AMAQI
9th Aug 2025401 AMAQI
9th Aug 2025452 AMAQI
9th Aug 2025443 AMAQI
29°C24/36°C
9th Aug 2025444 AMAQI
4 AM9th Aug 2025405 AMAQI
9th Aug 2025416 AMAQI
9th Aug 2025407 AMAQI
9th Aug 2025408 AMAQI
9th Aug 2025279 AMAQI
9th Aug 20252210 AMAQI
9th Aug 20253411 AMAQI
11 AM9th Aug 20253212 PMAQI
9th Aug 2025371 PMAQI
9th Aug 2025382 PMAQI
9th Aug 2025393 PMAQI
9th Aug 2025314 PMAQI
9th Aug 2025355 PMAQI
6 PM
11 PM
3 AM
--°C/°C
Day time
Avg. Highest Time
4 AM - 8 AM
48AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
9 AM - 10 AM
37AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 8 AM (Avg. 48), while the lowest AQI was between 9 AM to 10 AM (Avg. 37).
Night time
Avg. Highest Time
12 AM - 3 AM
46AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
7 PM - 11 PM
43AQI
5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 3 AM (Avg. 46), while the lowest AQI was between 7 PM to 11 PM (Avg. 43).
2025 Days Vs Air Quality
Koizuka, Kumagaya, Saitama, Japan
2025
84%
184
16%
36
Total number of days with different AQI categories in last 221 days in 2025 (144 days remaining)
Good
184 DaysModerate
36 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 221 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
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.
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
40AQI
40AQI
36AQI
36AQI
44AQI
41AQI
38AQI
40AQI
48AQI
44AQI
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
7
1
184
36
Highest AQI recorded in
July48AQI
Lowest AQI recorded in
February36AQI
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 3.1% (worsened AQI) compared to previous years: 2020 (37), 2021 (39), 2022 (40), 2023 (42), 2024 (40).
