Koyacho, Kawaii, Yamagata, 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
Koyacho, Kawaii, Yamagata, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
30th Aug 2021
94AQILowest AQI recorded on
9th Aug 2021
21AQISame Day Analysis (5th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 48 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 6th Aug - 7th Aug 2025
Koyacho, Kawaii, Yamagata, Japan
AQI
Day
Night
.
4 AM6th Aug 2025
6 PM
3 AM7th Aug 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
5AM6th Aug
49AQI
Avg. Lowest Time
12PM6th Aug
30AQI
In the last 24 hours,
Koyacho's AQI reached its highest point of 49 at 5 AM during the Night, while the lowest point, 30, was recorded at 12 PM during the Night between 6th Aug and 7th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Koyacho, Kawaii, Yamagata, Japan
JulAug
08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th
Day
Night
8th Jul 2025574 AMAQI
8th Jul 2025585 AMAQI
8th Jul 2025586 AMAQI
8th Jul 2025587 AMAQI
8th Jul 2025588 AMAQI
8th Jul 2025689 AMAQI
8th Jul 20256810 AMAQI
8th Jul 20256911 AMAQI
8th Jul 20256412 PMAQI
8th Jul 2025641 PMAQI
8th Jul 2025612 PMAQI
8th Jul 2025643 PMAQI
8th Jul 2025614 PMAQI
8th Jul 2025625 PMAQI
8th Jul 2025686 PMAQI
8th Jul 2025687 PMAQI
8th Jul 2025688 PMAQI
8th Jul 2025619 PMAQI
8th Jul 20256010 PMAQI
8th Jul 20256011 PMAQI
9th Jul 20255912 AMAQI
9th Jul 2025601 AMAQI
9th Jul 2025582 AMAQI
9th Jul 2025583 AMAQI
26°C21/33°C
9th Jul 2025584 AMAQI
9th Jul 2025585 AMAQI
9th Jul 2025586 AMAQI
9th Jul 2025587 AMAQI
9th Jul 2025588 AMAQI
9th Jul 2025689 AMAQI
9th Jul 20256610 AMAQI
9th Jul 20256711 AMAQI
9th Jul 20256412 PMAQI
9th Jul 2025601 PMAQI
9th Jul 2025602 PMAQI
9th Jul 2025633 PMAQI
9th Jul 2025684 PMAQI
9th Jul 2025635 PMAQI
9th Jul 2025626 PMAQI
9th Jul 2025637 PMAQI
9th Jul 2025628 PMAQI
9th Jul 2025599 PMAQI
9th Jul 20256010 PMAQI
9th Jul 20256011 PMAQI
10th Jul 20256012 AMAQI
10th Jul 2025601 AMAQI
10th Jul 2025582 AMAQI
10th Jul 2025583 AMAQI
25°C21/30°C
10th Jul 2025584 AMAQI
10th Jul 2025595 AMAQI
10th Jul 2025586 AMAQI
10th Jul 2025607 AMAQI
10th Jul 2025598 AMAQI
10th Jul 2025549 AMAQI
10th Jul 20255410 AMAQI
10th Jul 20255511 AMAQI
10th Jul 20255612 PMAQI
10th Jul 2025581 PMAQI
10th Jul 2025532 PMAQI
10th Jul 2025513 PMAQI
10th Jul 2025534 PMAQI
10th Jul 2025525 PMAQI
10th Jul 2025526 PMAQI
10th Jul 2025497 PMAQI
10th Jul 2025488 PMAQI
10th Jul 2025579 PMAQI
10th Jul 20255710 PMAQI
10th Jul 20255711 PMAQI
11th Jul 20255712 AMAQI
11th Jul 2025581 AMAQI
11th Jul 2025602 AMAQI
11th Jul 2025603 AMAQI
22°C17/30°C
11th Jul 2025604 AMAQI
11th Jul 2025615 AMAQI
11th Jul 2025586 AMAQI
11th Jul 2025607 AMAQI
11th Jul 2025608 AMAQI
11th Jul 2025349 AMAQI
11th Jul 20252110 AMAQI
11th Jul 20252411 AMAQI
11th Jul 20252612 PMAQI
11th Jul 2025401 PMAQI
11th Jul 2025382 PMAQI
11th Jul 2025443 PMAQI
11th Jul 2025484 PMAQI
11th Jul 2025465 PMAQI
11th Jul 2025406 PMAQI
11th Jul 2025437 PMAQI
11th Jul 2025508 PMAQI
11th Jul 2025559 PMAQI
11th Jul 20255510 PMAQI
11th Jul 20255511 PMAQI
12th Jul 20255512 AMAQI
12th Jul 2025561 AMAQI
12th Jul 2025582 AMAQI
12th Jul 2025573 AMAQI
18°C16/21°C
12th Jul 2025584 AMAQI
12th Jul 2025565 AMAQI
12th Jul 2025566 AMAQI
12th Jul 2025567 AMAQI
12th Jul 2025568 AMAQI
12th Jul 2025329 AMAQI
12th Jul 20252410 AMAQI
12th Jul 20252411 AMAQI
12th Jul 20252812 PMAQI
12th Jul 2025411 PMAQI
12th Jul 2025422 PMAQI
12th Jul 2025433 PMAQI
12th Jul 2025424 PMAQI
12th Jul 2025455 PMAQI
12th Jul 2025446 PMAQI
12th Jul 2025457 PMAQI
12th Jul 2025458 PMAQI
12th Jul 2025549 PMAQI
12th Jul 20255410 PMAQI
12th Jul 20255411 PMAQI
13th Jul 20255412 AMAQI
13th Jul 2025541 AMAQI
13th Jul 2025562 AMAQI
13th Jul 2025553 AMAQI
19°C14/25°C
13th Jul 2025564 AMAQI
13th Jul 2025555 AMAQI
13th Jul 2025556 AMAQI
13th Jul 2025557 AMAQI
13th Jul 2025558 AMAQI
13th Jul 2025409 AMAQI
13th Jul 20253210 AMAQI
13th Jul 20253411 AMAQI
13th Jul 20253212 PMAQI
13th Jul 2025461 PMAQI
13th Jul 2025492 PMAQI
13th Jul 2025513 PMAQI
13th Jul 2025524 PMAQI
13th Jul 2025525 PMAQI
13th Jul 2025526 PMAQI
13th Jul 2025507 PMAQI
13th Jul 2025528 PMAQI
13th Jul 2025549 PMAQI
13th Jul 20255310 PMAQI
13th Jul 20255211 PMAQI
14th Jul 20255312 AMAQI
14th Jul 2025541 AMAQI
14th Jul 2025542 AMAQI
14th Jul 2025543 AMAQI
22°C14/31°C
14th Jul 2025544 AMAQI
14th Jul 2025535 AMAQI
14th Jul 2025546 AMAQI
14th Jul 2025547 AMAQI
14th Jul 2025548 AMAQI
14th Jul 2025429 AMAQI
14th Jul 20252810 AMAQI
14th Jul 20252011 AMAQI
14th Jul 20252012 PMAQI
14th Jul 2025321 PMAQI
14th Jul 2025302 PMAQI
14th Jul 2025303 PMAQI
14th Jul 2025304 PMAQI
14th Jul 2025345 PMAQI
14th Jul 2025296 PMAQI
14th Jul 2025307 PMAQI
14th Jul 2025338 PMAQI
14th Jul 2025509 PMAQI
14th Jul 20254910 PMAQI
14th Jul 20255111 PMAQI
15th Jul 20255112 AMAQI
15th Jul 2025511 AMAQI
15th Jul 2025522 AMAQI
15th Jul 2025523 AMAQI
22°C18/26°C
15th Jul 2025524 AMAQI
15th Jul 2025525 AMAQI
15th Jul 2025526 AMAQI
15th Jul 2025527 AMAQI
15th Jul 2025528 AMAQI
15th Jul 2025319 AMAQI
15th Jul 20252410 AMAQI
15th Jul 20253211 AMAQI
15th Jul 20252712 PMAQI
15th Jul 2025351 PMAQI
15th Jul 2025342 PMAQI
15th Jul 2025363 PMAQI
15th Jul 2025394 PMAQI
15th Jul 2025405 PMAQI
15th Jul 2025376 PMAQI
15th Jul 2025357 PMAQI
15th Jul 2025328 PMAQI
15th Jul 2025479 PMAQI
15th Jul 20254610 PMAQI
15th Jul 20254711 PMAQI
16th Jul 20254612 AMAQI
16th Jul 2025481 AMAQI
16th Jul 2025502 AMAQI
16th Jul 2025513 AMAQI
23°C21/26°C
16th Jul 2025514 AMAQI
16th Jul 2025485 AMAQI
16th Jul 2025506 AMAQI
16th Jul 2025507 AMAQI
16th Jul 2025508 AMAQI
16th Jul 2025329 AMAQI
16th Jul 20253810 AMAQI
16th Jul 20254411 AMAQI
16th Jul 20254312 PMAQI
16th Jul 2025401 PMAQI
16th Jul 2025442 PMAQI
16th Jul 2025523 PMAQI
16th Jul 2025534 PMAQI
16th Jul 2025525 PMAQI
16th Jul 2025496 PMAQI
16th Jul 2025467 PMAQI
16th Jul 2025408 PMAQI
16th Jul 2025439 PMAQI
16th Jul 20254310 PMAQI
16th Jul 20254411 PMAQI
17th Jul 20254412 AMAQI
17th Jul 2025461 AMAQI
17th Jul 2025472 AMAQI
17th Jul 2025483 AMAQI
26°C22/33°C
17th Jul 2025474 AMAQI
17th Jul 2025465 AMAQI
17th Jul 2025476 AMAQI
17th Jul 2025467 AMAQI
17th Jul 2025478 AMAQI
17th Jul 2025279 AMAQI
17th Jul 20251510 AMAQI
17th Jul 20251611 AMAQI
17th Jul 20252012 PMAQI
17th Jul 2025301 PMAQI
17th Jul 2025332 PMAQI
17th Jul 2025323 PMAQI
17th Jul 2025344 PMAQI
17th Jul 2025335 PMAQI
17th Jul 2025336 PMAQI
17th Jul 2025367 PMAQI
17th Jul 2025378 PMAQI
17th Jul 2025449 PMAQI
17th Jul 20254310 PMAQI
17th Jul 20254311 PMAQI
18th Jul 20254312 AMAQI
18th Jul 2025451 AMAQI
18th Jul 2025452 AMAQI
18th Jul 2025463 AMAQI
24°C20/30°C
18th Jul 2025464 AMAQI
18th Jul 2025455 AMAQI
18th Jul 2025456 AMAQI
18th Jul 2025447 AMAQI
18th Jul 2025448 AMAQI
18th Jul 2025349 AMAQI
18th Jul 20253610 AMAQI
18th Jul 20253411 AMAQI
18th Jul 20253512 PMAQI
18th Jul 2025431 PMAQI
18th Jul 2025382 PMAQI
18th Jul 2025383 PMAQI
18th Jul 2025374 PMAQI
18th Jul 2025415 PMAQI
18th Jul 2025376 PMAQI
18th Jul 2025367 PMAQI
18th Jul 2025408 PMAQI
18th Jul 2025429 PMAQI
18th Jul 20254410 PMAQI
18th Jul 20254411 PMAQI
19th Jul 20254412 AMAQI
19th Jul 2025431 AMAQI
19th Jul 2025452 AMAQI
19th Jul 2025443 AMAQI
25°C19/31°C
19th Jul 2025444 AMAQI
19th Jul 2025435 AMAQI
19th Jul 2025436 AMAQI
19th Jul 2025447 AMAQI
19th Jul 2025438 AMAQI
19th Jul 2025489 AMAQI
19th Jul 20255310 AMAQI
19th Jul 20255111 AMAQI
19th Jul 20255012 PMAQI
19th Jul 2025511 PMAQI
19th Jul 2025492 PMAQI
19th Jul 2025443 PMAQI
19th Jul 2025454 PMAQI
19th Jul 2025465 PMAQI
19th Jul 2025486 PMAQI
19th Jul 2025487 PMAQI
19th Jul 2025508 PMAQI
19th Jul 2025429 PMAQI
19th Jul 20254310 PMAQI
19th Jul 20254211 PMAQI
20th Jul 20254412 AMAQI
20th Jul 2025441 AMAQI
20th Jul 2025442 AMAQI
20th Jul 2025443 AMAQI
26°C19/34°C
20th Jul 2025444 AMAQI
20th Jul 2025445 AMAQI
20th Jul 2025446 AMAQI
20th Jul 2025457 AMAQI
20th Jul 2025448 AMAQI
20th Jul 2025469 AMAQI
20th Jul 20255410 AMAQI
20th Jul 20255211 AMAQI
20th Jul 20254712 PMAQI
20th Jul 2025461 PMAQI
20th Jul 2025512 PMAQI
20th Jul 2025423 PMAQI
20th Jul 2025424 PMAQI
20th Jul 2025455 PMAQI
20th Jul 2025446 PMAQI
20th Jul 2025497 PMAQI
20th Jul 2025508 PMAQI
20th Jul 2025489 PMAQI
20th Jul 20254910 PMAQI
20th Jul 20254711 PMAQI
21st Jul 20254712 AMAQI
21st Jul 2025481 AMAQI
21st Jul 2025442 AMAQI
21st Jul 2025443 AMAQI
26°C20/33°C
21st Jul 2025444 AMAQI
21st Jul 2025455 AMAQI
21st Jul 2025456 AMAQI
21st Jul 2025447 AMAQI
21st Jul 2025448 AMAQI
21st Jul 2025499 AMAQI
21st Jul 20255110 AMAQI
21st Jul 20255011 AMAQI
21st Jul 20254012 PMAQI
21st Jul 2025361 PMAQI
21st Jul 2025412 PMAQI
21st Jul 2025443 PMAQI
21st Jul 2025464 PMAQI
21st Jul 2025425 PMAQI
21st Jul 2025406 PMAQI
21st Jul 2025397 PMAQI
21st Jul 2025388 PMAQI
21st Jul 2025449 PMAQI
21st Jul 20254510 PMAQI
21st Jul 20254311 PMAQI
22nd Jul 20254012 AMAQI
22nd Jul 2025461 AMAQI
22nd Jul 2025432 AMAQI
22nd Jul 2025443 AMAQI
26°C20/34°C
22nd Jul 2025434 AMAQI
22nd Jul 2025445 AMAQI
22nd Jul 2025456 AMAQI
22nd Jul 2025447 AMAQI
22nd Jul 2025448 AMAQI
22nd Jul 2025459 AMAQI
22nd Jul 20254810 AMAQI
22nd Jul 20254811 AMAQI
22nd Jul 20254612 PMAQI
22nd Jul 2025421 PMAQI
22nd Jul 2025382 PMAQI
22nd Jul 2025353 PMAQI
22nd Jul 2025364 PMAQI
22nd Jul 2025425 PMAQI
22nd Jul 2025396 PMAQI
22nd Jul 2025347 PMAQI
22nd Jul 2025358 PMAQI
22nd Jul 2025439 PMAQI
22nd Jul 20254510 PMAQI
22nd Jul 20254811 PMAQI
23rd Jul 20254412 AMAQI
23rd Jul 2025401 AMAQI
23rd Jul 2025452 AMAQI
23rd Jul 2025443 AMAQI
26°C20/34°C
23rd Jul 2025434 AMAQI
23rd Jul 2025435 AMAQI
23rd Jul 2025436 AMAQI
23rd Jul 2025437 AMAQI
23rd Jul 2025448 AMAQI
23rd Jul 2025519 AMAQI
23rd Jul 20255210 AMAQI
23rd Jul 20254211 AMAQI
23rd Jul 20252812 PMAQI
23rd Jul 2025341 PMAQI
23rd Jul 2025312 PMAQI
23rd Jul 2025403 PMAQI
23rd Jul 2025464 PMAQI
23rd Jul 2025365 PMAQI
23rd Jul 2025366 PMAQI
23rd Jul 2025397 PMAQI
23rd Jul 2025448 PMAQI
23rd Jul 2025489 PMAQI
23rd Jul 20254810 PMAQI
23rd Jul 20255011 PMAQI
24th Jul 20254812 AMAQI
24th Jul 2025441 AMAQI
24th Jul 2025442 AMAQI
24th Jul 2025443 AMAQI
26°C20/34°C
24th Jul 2025444 AMAQI
24th Jul 2025445 AMAQI
24th Jul 2025446 AMAQI
24th Jul 2025437 AMAQI
24th Jul 2025448 AMAQI
24th Jul 2025499 AMAQI
24th Jul 20255210 AMAQI
24th Jul 20254411 AMAQI
24th Jul 20254212 PMAQI
24th Jul 2025371 PMAQI
24th Jul 2025402 PMAQI
24th Jul 2025463 PMAQI
24th Jul 2025484 PMAQI
24th Jul 2025525 PMAQI
24th Jul 2025526 PMAQI
24th Jul 2025537 PMAQI
24th Jul 2025558 PMAQI
24th Jul 2025539 PMAQI
24th Jul 20255410 PMAQI
24th Jul 20255311 PMAQI
25th Jul 20255112 AMAQI
25th Jul 2025481 AMAQI
25th Jul 2025502 AMAQI
25th Jul 2025453 AMAQI
26°C19/34°C
25th Jul 2025454 AMAQI
25th Jul 2025465 AMAQI
25th Jul 2025466 AMAQI
25th Jul 2025467 AMAQI
25th Jul 2025468 AMAQI
25th Jul 2025549 AMAQI
25th Jul 20255610 AMAQI
25th Jul 20255611 AMAQI
25th Jul 20255612 PMAQI
25th Jul 2025541 PMAQI
25th Jul 2025542 PMAQI
25th Jul 2025563 PMAQI
25th Jul 2025534 PMAQI
25th Jul 2025415 PMAQI
25th Jul 2025446 PMAQI
25th Jul 2025537 PMAQI
25th Jul 2025518 PMAQI
25th Jul 2025479 PMAQI
25th Jul 20254810 PMAQI
25th Jul 20254711 PMAQI
26th Jul 20254412 AMAQI
26th Jul 2025471 AMAQI
26th Jul 2025472 AMAQI
26th Jul 2025473 AMAQI
26°C19/34°C
26th Jul 2025484 AMAQI
26th Jul 2025515 AMAQI
26th Jul 2025506 AMAQI
26th Jul 2025517 AMAQI
26th Jul 2025518 AMAQI
26th Jul 2025529 AMAQI
26th Jul 20255510 AMAQI
26th Jul 20255611 AMAQI
26th Jul 20255412 PMAQI
26th Jul 2025491 PMAQI
26th Jul 2025482 PMAQI
26th Jul 2025483 PMAQI
26th Jul 2025424 PMAQI
26th Jul 2025475 PMAQI
26th Jul 2025516 PMAQI
26th Jul 2025527 PMAQI
26th Jul 2025528 PMAQI
26th Jul 2025549 PMAQI
26th Jul 20255010 PMAQI
26th Jul 20255011 PMAQI
27th Jul 20255412 AMAQI
27th Jul 2025521 AMAQI
27th Jul 2025502 AMAQI
27th Jul 2025503 AMAQI
26°C19/35°C
27th Jul 2025504 AMAQI
27th Jul 2025505 AMAQI
27th Jul 2025516 AMAQI
27th Jul 2025507 AMAQI
27th Jul 2025518 AMAQI
27th Jul 2025529 AMAQI
27th Jul 20255510 AMAQI
27th Jul 20255711 AMAQI
27th Jul 20255612 PMAQI
27th Jul 2025521 PMAQI
27th Jul 2025512 PMAQI
27th Jul 2025493 PMAQI
27th Jul 2025464 PMAQI
27th Jul 2025555 PMAQI
27th Jul 2025526 PMAQI
27th Jul 2025527 PMAQI
27th Jul 2025508 PMAQI
27th Jul 2025499 PMAQI
27th Jul 20255210 PMAQI
27th Jul 20255311 PMAQI
28th Jul 20255312 AMAQI
28th Jul 2025521 AMAQI
28th Jul 2025522 AMAQI
28th Jul 2025513 AMAQI
26°C21/33°C
28th Jul 2025514 AMAQI
28th Jul 2025515 AMAQI
28th Jul 2025516 AMAQI
28th Jul 2025527 AMAQI
28th Jul 2025528 AMAQI
28th Jul 2025509 AMAQI
28th Jul 20254310 AMAQI
28th Jul 20255011 AMAQI
28th Jul 20254012 PMAQI
28th Jul 2025381 PMAQI
28th Jul 2025372 PMAQI
28th Jul 2025343 PMAQI
28th Jul 2025384 PMAQI
28th Jul 2025325 PMAQI
28th Jul 2025456 PMAQI
28th Jul 2025497 PMAQI
28th Jul 2025488 PMAQI
28th Jul 2025519 PMAQI
28th Jul 20254810 PMAQI
28th Jul 20254711 PMAQI
29th Jul 20255112 AMAQI
29th Jul 2025491 AMAQI
29th Jul 2025522 AMAQI
29th Jul 2025523 AMAQI
26°C20/34°C
29th Jul 2025524 AMAQI
29th Jul 2025505 AMAQI
29th Jul 2025506 AMAQI
29th Jul 2025507 AMAQI
29th Jul 2025508 AMAQI
29th Jul 2025529 AMAQI
29th Jul 20255410 AMAQI
29th Jul 20255411 AMAQI
29th Jul 20255412 PMAQI
29th Jul 2025521 PMAQI
29th Jul 2025512 PMAQI
29th Jul 2025513 PMAQI
29th Jul 2025544 PMAQI
29th Jul 2025545 PMAQI
29th Jul 2025526 PMAQI
29th Jul 2025487 PMAQI
29th Jul 2025508 PMAQI
29th Jul 2025549 PMAQI
29th Jul 20255110 PMAQI
29th Jul 20255111 PMAQI
30th Jul 20255312 AMAQI
30th Jul 2025531 AMAQI
30th Jul 2025512 AMAQI
30th Jul 2025513 AMAQI
27°C20/35°C
30th Jul 2025514 AMAQI
30th Jul 2025525 AMAQI
30th Jul 2025536 AMAQI
30th Jul 2025527 AMAQI
30th Jul 2025528 AMAQI
30th Jul 2025549 AMAQI
30th Jul 20254710 AMAQI
30th Jul 20255211 AMAQI
30th Jul 20254412 PMAQI
30th Jul 2025441 PMAQI
30th Jul 2025452 PMAQI
30th Jul 2025463 PMAQI
30th Jul 2025454 PMAQI
30th Jul 2025465 PMAQI
30th Jul 2025496 PMAQI
30th Jul 2025397 PMAQI
30th Jul 2025408 PMAQI
30th Jul 2025459 PMAQI
30th Jul 20254910 PMAQI
30th Jul 20255111 PMAQI
31st Jul 20255012 AMAQI
31st Jul 2025501 AMAQI
31st Jul 2025502 AMAQI
31st Jul 2025513 AMAQI
25°C19/34°C
31st Jul 2025524 AMAQI
31st Jul 2025525 AMAQI
31st Jul 2025526 AMAQI
31st Jul 2025527 AMAQI
31st Jul 2025528 AMAQI
31st Jul 2025529 AMAQI
31st Jul 20255210 AMAQI
31st Jul 20255011 AMAQI
31st Jul 20254412 PMAQI
31st Jul 2025401 PMAQI
31st Jul 2025412 PMAQI
31st Jul 2025403 PMAQI
31st Jul 2025374 PMAQI
31st Jul 2025425 PMAQI
31st Jul 2025446 PMAQI
31st Jul 2025387 PMAQI
31st Jul 2025388 PMAQI
31st Jul 2025559 PMAQI
31st Jul 20254510 PMAQI
31st Jul 20253911 PMAQI
1st Aug 20253612 AMAQI
1st Aug 2025421 AMAQI
1st Aug 2025422 AMAQI
1st Aug 2025443 AMAQI
24°C17/32°C
1st Aug 2025434 AMAQI
1st Aug 2025415 AMAQI
1st Aug 2025406 AMAQI
1st Aug 2025407 AMAQI
1st Aug 2025398 AMAQI
1st Aug 2025389 AMAQI
1st Aug 20253110 AMAQI
1st Aug 20254011 AMAQI
1st Aug 20254812 PMAQI
1st Aug 2025391 PMAQI
1st Aug 2025392 PMAQI
1st Aug 2025313 PMAQI
1st Aug 2025484 PMAQI
1st Aug 2025465 PMAQI
1st Aug 2025426 PMAQI
1st Aug 2025417 PMAQI
1st Aug 2025318 PMAQI
1st Aug 2025329 PMAQI
1st Aug 20253710 PMAQI
1st Aug 20253411 PMAQI
2nd Aug 20253212 AMAQI
2nd Aug 2025361 AMAQI
2nd Aug 2025392 AMAQI
2nd Aug 2025413 AMAQI
23°C17/29°C
2nd Aug 2025424 AMAQI
2nd Aug 2025425 AMAQI
2nd Aug 2025426 AMAQI
2nd Aug 2025407 AMAQI
2nd Aug 2025418 AMAQI
2nd Aug 2025379 AMAQI
2nd Aug 20253410 AMAQI
2nd Aug 20253611 AMAQI
2nd Aug 20252712 PMAQI
2nd Aug 2025341 PMAQI
2nd Aug 2025442 PMAQI
2nd Aug 2025483 PMAQI
2nd Aug 2025394 PMAQI
2nd Aug 2025435 PMAQI
2nd Aug 2025496 PMAQI
2nd Aug 2025497 PMAQI
2nd Aug 2025388 PMAQI
2nd Aug 2025399 PMAQI
2nd Aug 20253510 PMAQI
2nd Aug 20254411 PMAQI
3rd Aug 20253412 AMAQI
3rd Aug 2025371 AMAQI
3rd Aug 2025402 AMAQI
3rd Aug 2025393 AMAQI
25°C22/32°C
3rd Aug 2025404 AMAQI
3rd Aug 2025405 AMAQI
3rd Aug 2025386 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025398 AMAQI
3rd Aug 2025409 AMAQI
3rd Aug 20254510 AMAQI
3rd Aug 20254911 AMAQI
3rd Aug 20255612 PMAQI
3rd Aug 2025521 PMAQI
3rd Aug 2025532 PMAQI
3rd Aug 2025483 PMAQI
3rd Aug 2025534 PMAQI
3rd Aug 2025565 PMAQI
3rd Aug 2025566 PMAQI
3rd Aug 2025587 PMAQI
3rd Aug 2025578 PMAQI
3rd Aug 2025439 PMAQI
3rd Aug 20254310 PMAQI
3rd Aug 20254111 PMAQI
4th Aug 20253812 AMAQI
4th Aug 2025401 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025403 AMAQI
26°C20/34°C
4th Aug 2025434 AMAQI
4th Aug 2025445 AMAQI
4th Aug 2025446 AMAQI
4th Aug 2025447 AMAQI
4th Aug 2025448 AMAQI
4th Aug 2025509 AMAQI
4th Aug 20254710 AMAQI
4th Aug 20255811 AMAQI
4th Aug 20255712 PMAQI
4th Aug 2025581 PMAQI
4th Aug 2025582 PMAQI
4th Aug 2025583 PMAQI
4th Aug 2025594 PMAQI
4th Aug 2025595 PMAQI
4th Aug 2025666 PMAQI
4th Aug 2025637 PMAQI
4th Aug 2025628 PMAQI
4th Aug 2025579 PMAQI
4th Aug 20255610 PMAQI
4th Aug 20255411 PMAQI
5th Aug 20255312 AMAQI
5th Aug 2025461 AMAQI
5th Aug 2025412 AMAQI
5th Aug 2025403 AMAQI
27°C21/34°C
5th Aug 2025474 AMAQI
5th Aug 2025475 AMAQI
5th Aug 2025456 AMAQI
5th Aug 2025467 AMAQI
5th Aug 2025488 AMAQI
5th Aug 2025559 AMAQI
5th Aug 20255810 AMAQI
5th Aug 20255511 AMAQI
5th Aug 20256212 PMAQI
5th Aug 2025421 PMAQI
5th Aug 2025522 PMAQI
5th Aug 2025473 PMAQI
5th Aug 2025544 PMAQI
5th Aug 2025505 PMAQI
5th Aug 2025486 PMAQI
5th Aug 2025487 PMAQI
5th Aug 2025468 PMAQI
5th Aug 2025449 PMAQI
5th Aug 20254810 PMAQI
5th Aug 20254011 PMAQI
6th Aug 20254112 AMAQI
6th Aug 2025461 AMAQI
6th Aug 2025472 AMAQI
6th Aug 2025453 AMAQI
25°C22/29°C
6th Aug 2025474 AMAQI
6th Aug 2025495 AMAQI
6th Aug 2025486 AMAQI
6th Aug 2025487 AMAQI
6th Aug 2025488 AMAQI
6th Aug 2025349 AMAQI
6th Aug 20253610 AMAQI
6th Aug 20253011 AMAQI
6th Aug 20253012 PMAQI
6th Aug 2025321 PMAQI
6th Aug 2025342 PMAQI
6th Aug 2025343 PMAQI
6th Aug 2025364 PMAQI
6th Aug 2025425 PMAQI
6th Aug 2025346 PMAQI
6th Aug 2025367 PMAQI
6th Aug 2025488 PMAQI
6th Aug 2025459 PMAQI
6th Aug 20254810 PMAQI
6th Aug 20254811 PMAQI
7th Aug 20254412 AMAQI
7th Aug 2025461 AMAQI
7th Aug 2025462 AMAQI
7th Aug 2025443 AMAQI
--°C/°C
4 AM
11 AM
6 PM
11 PM
3 AM
--°C/°C
Day time
Avg. Highest Time
4 AM - 8 AM
49AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
9 AM - 6 PM
45AQI
10 hours / Day
300 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 8 AM (Avg. 49), while the lowest AQI was between 9 AM to 6 PM (Avg. 45).
Night time
Avg. Highest Time
12 AM - 11 PM
48AQI
9 hours / Day
270 hours / Month
Avg. Lowest Time
12 AM - 8 PM
48AQI
6 hours / Day
180 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 11 PM (Avg. 48), while the lowest AQI was between 12 AM to 8 PM (Avg. 48).
2025 Days Vs Air Quality
Koyacho, Kawaii, Yamagata, Japan
2025
84%
183
16%
34
Total number of days with different AQI categories in last 218 days in 2025 (147 days remaining)
Good
183 DaysModerate
34 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 84%
Health Risk Level:
Low
In 2025, 84% of 218 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
Koyacho, Kawaii, Yamagata, 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
29AQI
29AQI
2nd January 2025
29AQI
29AQI
3rd January 2025
27AQI
27AQI
4th January 2025
28AQI
28AQI
5th January 2025
26AQI
26AQI
6th January 2025
29AQI
29AQI
7th January 2025
29AQI
29AQI
8th January 2025
27AQI
27AQI
9th January 2025
25AQI
25AQI
10th January 2025
27AQI
27AQI
11th January 2025
26AQI
26AQI
12th January 2025
31AQI
31AQI
13th January 2025
35AQI
35AQI
14th January 2025
29AQI
29AQI
15th January 2025
28AQI
28AQI
16th January 2025
27AQI
27AQI
17th January 2025
27AQI
27AQI
18th January 2025
27AQI
27AQI
19th January 2025
34AQI
34AQI
20th January 2025
46AQI
46AQI
21st January 2025
51AQI
51AQI
22nd January 2025
47AQI
47AQI
23rd January 2025
42AQI
42AQI
24th January 2025
39AQI
39AQI
25th January 2025
33AQI
33AQI
26th January 2025
30AQI
30AQI
27th January 2025
31AQI
31AQI
28th January 2025
35AQI
35AQI
29th January 2025
29AQI
29AQI
30th January 2025
31AQI
31AQI
31st January 2025
31AQI
31AQI
1st February 2025
30AQI
30AQI
2nd February 2025
31AQI
31AQI
3rd February 2025
42AQI
42AQI
4th February 2025
30AQI
30AQI
5th February 2025
30AQI
30AQI
6th February 2025
30AQI
30AQI
7th February 2025
29AQI
29AQI
8th February 2025
29AQI
29AQI
9th February 2025
30AQI
30AQI
10th February 2025
31AQI
31AQI
11th February 2025
32AQI
32AQI
12th February 2025
31AQI
31AQI
13th February 2025
32AQI
32AQI
14th February 2025
30AQI
30AQI
15th February 2025
31AQI
31AQI
16th February 2025
36AQI
36AQI
17th February 2025
45AQI
45AQI
18th February 2025
33AQI
33AQI
19th February 2025
39AQI
39AQI
20th February 2025
31AQI
31AQI
21st February 2025
31AQI
31AQI
22nd February 2025
32AQI
32AQI
23rd February 2025
33AQI
33AQI
24th February 2025
33AQI
33AQI
25th February 2025
34AQI
34AQI
26th February 2025
43AQI
43AQI
27th February 2025
41AQI
41AQI
28th February 2025
54AQI
54AQI
1st March 2025
51AQI
51AQI
2nd March 2025
59AQI
59AQI
3rd March 2025
42AQI
42AQI
4th March 2025
39AQI
39AQI
5th March 2025
29AQI
29AQI
6th March 2025
32AQI
32AQI
7th March 2025
32AQI
32AQI
8th March 2025
34AQI
34AQI
9th March 2025
33AQI
33AQI
10th March 2025
39AQI
39AQI
11th March 2025
44AQI
44AQI
12th March 2025
47AQI
47AQI
13th March 2025
48AQI
48AQI
14th March 2025
37AQI
37AQI
15th March 2025
41AQI
41AQI
16th March 2025
24AQI
24AQI
17th March 2025
21AQI
21AQI
18th March 2025
27AQI
27AQI
19th March 2025
22AQI
22AQI
20th March 2025
31AQI
31AQI
21st March 2025
49AQI
49AQI
22nd March 2025
52AQI
52AQI
23rd March 2025
45AQI
45AQI
24th March 2025
51AQI
51AQI
25th March 2025
68AQI
68AQI
26th March 2025
63AQI
63AQI
27th March 2025
67AQI
67AQI
28th March 2025
49AQI
49AQI
29th March 2025
36AQI
36AQI
30th March 2025
35AQI
35AQI
31st March 2025
31AQI
31AQI
1st April 2025
30AQI
30AQI
2nd April 2025
22AQI
22AQI
3rd April 2025
20AQI
20AQI
4th April 2025
18AQI
18AQI
5th April 2025
29AQI
29AQI
6th April 2025
29AQI
29AQI
7th April 2025
27AQI
27AQI
8th April 2025
39AQI
39AQI
9th April 2025
31AQI
31AQI
10th April 2025
42AQI
42AQI
11th April 2025
43AQI
43AQI
12th April 2025
48AQI
48AQI
13th April 2025
28AQI
28AQI
14th April 2025
24AQI
24AQI
15th April 2025
20AQI
20AQI
16th April 2025
22AQI
22AQI
17th April 2025
41AQI
41AQI
18th April 2025
47AQI
47AQI
19th April 2025
61AQI
61AQI
20th April 2025
50AQI
50AQI
21st April 2025
46AQI
46AQI
22nd April 2025
50AQI
50AQI
23rd April 2025
37AQI
37AQI
24th April 2025
27AQI
27AQI
25th April 2025
36AQI
36AQI
26th April 2025
47AQI
47AQI
27th April 2025
48AQI
48AQI
28th April 2025
49AQI
49AQI
29th April 2025
32AQI
32AQI
30th April 2025
27AQI
27AQI
1st May 2025
35AQI
35AQI
2nd May 2025
22AQI
22AQI
3rd May 2025
34AQI
34AQI
4th May 2025
30AQI
30AQI
5th May 2025
36AQI
36AQI
6th May 2025
33AQI
33AQI
7th May 2025
29AQI
29AQI
8th May 2025
34AQI
34AQI
9th May 2025
41AQI
41AQI
10th May 2025
25AQI
25AQI
11th May 2025
28AQI
28AQI
12th May 2025
30AQI
30AQI
13th May 2025
35AQI
35AQI
14th May 2025
44AQI
44AQI
15th May 2025
49AQI
49AQI
16th May 2025
54AQI
54AQI
17th May 2025
43AQI
43AQI
18th May 2025
47AQI
47AQI
19th May 2025
45AQI
45AQI
20th May 2025
54AQI
54AQI
21st May 2025
61AQI
61AQI
22nd May 2025
51AQI
51AQI
23rd May 2025
47AQI
47AQI
24th May 2025
44AQI
44AQI
25th May 2025
29AQI
29AQI
26th May 2025
31AQI
31AQI
27th May 2025
32AQI
32AQI
28th May 2025
34AQI
34AQI
29th May 2025
36AQI
36AQI
30th May 2025
36AQI
36AQI
31st May 2025
23AQI
23AQI
1st June 2025
23AQI
23AQI
2nd June 2025
38AQI
38AQI
3rd June 2025
41AQI
41AQI
4th June 2025
37AQI
37AQI
5th June 2025
39AQI
39AQI
6th June 2025
44AQI
44AQI
7th June 2025
53AQI
53AQI
8th June 2025
59AQI
59AQI
9th June 2025
62AQI
62AQI
10th June 2025
54AQI
54AQI
11th June 2025
50AQI
50AQI
12th June 2025
47AQI
47AQI
13th June 2025
47AQI
47AQI
14th June 2025
50AQI
50AQI
15th June 2025
32AQI
32AQI
16th June 2025
30AQI
30AQI
17th June 2025
35AQI
35AQI
18th June 2025
41AQI
41AQI
19th June 2025
45AQI
45AQI
20th June 2025
45AQI
45AQI
21st June 2025
46AQI
46AQI
22nd June 2025
55AQI
55AQI
23rd June 2025
51AQI
51AQI
24th June 2025
48AQI
48AQI
25th June 2025
48AQI
48AQI
26th June 2025
42AQI
42AQI
27th June 2025
48AQI
48AQI
28th June 2025
44AQI
44AQI
29th June 2025
45AQI
45AQI
30th June 2025
50AQI
50AQI
1st July 2025
52AQI
52AQI
2nd July 2025
58AQI
58AQI
3rd July 2025
64AQI
64AQI
4th July 2025
64AQI
64AQI
5th July 2025
59AQI
59AQI
6th July 2025
58AQI
58AQI
7th July 2025
59AQI
59AQI
8th July 2025
61AQI
61AQI
9th July 2025
61AQI
61AQI
10th July 2025
56AQI
56AQI
11th July 2025
50AQI
50AQI
12th July 2025
49AQI
49AQI
13th July 2025
51AQI
51AQI
14th July 2025
44AQI
44AQI
15th July 2025
44AQI
44AQI
16th July 2025
46AQI
46AQI
17th July 2025
39AQI
39AQI
18th July 2025
42AQI
42AQI
19th July 2025
46AQI
46AQI
20th July 2025
46AQI
46AQI
21st July 2025
44AQI
44AQI
22nd July 2025
42AQI
42AQI
23rd July 2025
42AQI
42AQI
24th July 2025
48AQI
48AQI
25th July 2025
49AQI
49AQI
26th July 2025
50AQI
50AQI
27th July 2025
52AQI
52AQI
28th July 2025
47AQI
47AQI
29th July 2025
52AQI
52AQI
30th July 2025
49AQI
49AQI
31st July 2025
47AQI
47AQI
1st August 2025
39AQI
39AQI
2nd August 2025
40AQI
40AQI
3rd August 2025
46AQI
46AQI
4th August 2025
52AQI
52AQI
5th August 2025
48AQI
48AQI
32AQI
34AQI
41AQI
36AQI
38AQI
45AQI
51AQI
45AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202540AQI
30
1
27
1
24
7
29
1
27
4
24
6
18
13
4
1
183
34
Highest AQI recorded in
July51AQI
Lowest AQI recorded in
January32AQI
202438AQI
31
28
1
26
5
13
17
27
4
20
10
24
7
31
29
1
31
27
3
31
318
48
Highest AQI recorded in
April52AQI
Lowest AQI recorded in
December25AQI
202347AQI
29
2
27
1
24
7
23
7
26
5
20
10
11
20
11
20
7
23
13
18
11
18
30
1
232
132
Highest AQI recorded in
September58AQI
Lowest AQI recorded in
January34AQI
202235AQI
30
21
28
3
16
1
24
7
23
7
21
1
28
29
2
27
3
31
279
23
Highest AQI recorded in
May42AQI
Lowest AQI recorded in
December26AQI
202132AQI
30
1
26
2
29
18
3
27
4
25
5
26
5
30
1
30
31
30
31
333
21
Highest AQI recorded in
June41AQI
Lowest AQI recorded in
January26AQI
202028AQI
13
20
1
18
28
2
30
1
20
10
1
19
31
29
1
31
239
15
1
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
December18AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
47AQILeast Polluted Year Recorded
2020(Avg.)
28AQIKoyacho's annual 2025 AQI (40) shows an average percentage change of 13.5% (worsened AQI) compared to previous years: 2020 (28), 2021 (32), 2022 (35), 2023 (47), 2024 (38).
