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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

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

2022
2023
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
5th Aug 2023
69AQI
Lowest AQI recorded on
3rd Aug 2026
17AQI

Same Day Analysis (14th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 22 of Good air quality, showing improvement over 2025, 2024 and 2023 on the same day.

Day & Night AQI Trend: 13th Aug - 14th Aug 2026

Koyacho, Kawaii, Yamagata, Japan

AQI
Day
Night
.

4 AM13th Aug 2026

6 PM

3 AM14th Aug 2026

Day time
Avg. Highest Time
8AM13th Aug

31AQI

Avg. Lowest Time
5PM13th Aug

21AQI

Night time
Avg. Highest Time
8PM13th Aug

27AQI

Avg. Lowest Time
3AM14th Aug

21AQI

In the last 24 hours,

Koyacho's AQI reached its highest point of 31 at 8 AM during the Day, while the lowest point, 21, was recorded at 3 AM during the Night between 13th Aug and 14th Aug 2026.

Day & Night AQI Trend : Jul - Aug 2026

Koyacho, Kawaii, Yamagata, Japan

JulAug
16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th
Day
Night
16th Jul 2026264 AMAQI
16th Jul 2026285 AMAQI
16th Jul 2026286 AMAQI
16th Jul 2026277 AMAQI
16th Jul 2026288 AMAQI
16th Jul 2026279 AMAQI
16th Jul 20263010 AMAQI
16th Jul 20262711 AMAQI
16th Jul 20262812 PMAQI
16th Jul 2026221 PMAQI
16th Jul 2026242 PMAQI
16th Jul 2026233 PMAQI
16th Jul 2026204 PMAQI
16th Jul 2026245 PMAQI
16th Jul 2026336 PMAQI
16th Jul 2026237 PMAQI
16th Jul 2026258 PMAQI
16th Jul 2026579 PMAQI
16th Jul 20264710 PMAQI
16th Jul 20262011 PMAQI
17th Jul 20262012 AMAQI
17th Jul 2026201 AMAQI
17th Jul 2026212 AMAQI
17th Jul 2026313 AMAQI

25°C21/31°C

17th Jul 2026364 AMAQI
17th Jul 2026315 AMAQI
17th Jul 2026256 AMAQI
17th Jul 2026467 AMAQI
17th Jul 2026288 AMAQI
17th Jul 2026389 AMAQI
17th Jul 20263610 AMAQI
17th Jul 20265611 AMAQI
17th Jul 20266512 PMAQI
17th Jul 2026461 PMAQI
17th Jul 2026242 PMAQI
17th Jul 2026243 PMAQI
17th Jul 2026504 PMAQI
17th Jul 2026485 PMAQI
17th Jul 2026486 PMAQI
17th Jul 2026497 PMAQI
17th Jul 2026468 PMAQI
17th Jul 2026449 PMAQI
17th Jul 20264410 PMAQI
17th Jul 20264211 PMAQI
18th Jul 20264412 AMAQI
18th Jul 2026421 AMAQI
18th Jul 2026402 AMAQI
18th Jul 2026443 AMAQI

23°C21/26°C

18th Jul 2026444 AMAQI
18th Jul 2026445 AMAQI
18th Jul 2026446 AMAQI
18th Jul 2026427 AMAQI
18th Jul 2026428 AMAQI
18th Jul 2026429 AMAQI
18th Jul 20264210 AMAQI
18th Jul 20264411 AMAQI
18th Jul 20264212 PMAQI
18th Jul 2026381 PMAQI
18th Jul 2026422 PMAQI
18th Jul 2026383 PMAQI
18th Jul 2026424 PMAQI
18th Jul 2026405 PMAQI
18th Jul 2026406 PMAQI
18th Jul 2026387 PMAQI
18th Jul 2026338 PMAQI
18th Jul 2026369 PMAQI
18th Jul 20263810 PMAQI
18th Jul 20262911 PMAQI
19th Jul 20263612 AMAQI
19th Jul 2026341 AMAQI
19th Jul 2026332 AMAQI
19th Jul 2026313 AMAQI

23°C21/27°C

19th Jul 2026294 AMAQI
19th Jul 2026295 AMAQI
19th Jul 2026256 AMAQI
19th Jul 2026277 AMAQI
19th Jul 2026238 AMAQI
19th Jul 2026259 AMAQI
19th Jul 20262310 AMAQI
19th Jul 20262511 AMAQI
19th Jul 20262512 PMAQI
19th Jul 2026251 PMAQI
19th Jul 2026252 PMAQI
19th Jul 2026293 PMAQI
19th Jul 2026274 PMAQI
19th Jul 2026315 PMAQI
19th Jul 2026386 PMAQI
19th Jul 2026407 PMAQI
19th Jul 2026468 PMAQI
19th Jul 2026519 PMAQI
19th Jul 20265210 PMAQI
19th Jul 20265211 PMAQI
20th Jul 20265412 AMAQI
20th Jul 2026531 AMAQI
20th Jul 2026542 AMAQI
20th Jul 2026533 AMAQI

25°C20/31°C

20th Jul 2026554 AMAQI
20th Jul 2026565 AMAQI
20th Jul 2026626 AMAQI
20th Jul 2026567 AMAQI
20th Jul 2026548 AMAQI
20th Jul 2026579 AMAQI
20th Jul 20266210 AMAQI
20th Jul 20267811 AMAQI
20th Jul 20267912 PMAQI
20th Jul 2026761 PMAQI
20th Jul 2026802 PMAQI
20th Jul 2026803 PMAQI
20th Jul 20261214 PMAQI
20th Jul 20261005 PMAQI
20th Jul 20261086 PMAQI
20th Jul 2026947 PMAQI
20th Jul 2026928 PMAQI
20th Jul 2026869 PMAQI
20th Jul 20268610 PMAQI
20th Jul 20269611 PMAQI
21st Jul 20269412 AMAQI
21st Jul 2026821 AMAQI
21st Jul 2026792 AMAQI
21st Jul 2026833 AMAQI

26°C21/31°C

21st Jul 2026904 AMAQI
21st Jul 2026865 AMAQI
21st Jul 2026866 AMAQI
21st Jul 2026897 AMAQI
21st Jul 2026928 AMAQI
21st Jul 2026879 AMAQI
21st Jul 20268810 AMAQI
21st Jul 20269011 AMAQI
21st Jul 2026761 PMAQI
21st Jul 2026692 PMAQI
21st Jul 2026653 PMAQI
21st Jul 2026604 PMAQI
21st Jul 2026575 PMAQI
21st Jul 2026596 PMAQI
21st Jul 20261007 PMAQI
21st Jul 2026508 PMAQI
21st Jul 2026469 PMAQI
21st Jul 20265110 PMAQI
21st Jul 20265211 PMAQI
22nd Jul 20265312 AMAQI
22nd Jul 2026471 AMAQI
22nd Jul 2026382 AMAQI
22nd Jul 2026403 AMAQI

25°C21/31°C

22nd Jul 2026424 AMAQI
22nd Jul 2026465 AMAQI
22nd Jul 2026386 AMAQI
22nd Jul 2026477 AMAQI
22nd Jul 2026578 AMAQI
22nd Jul 2026609 AMAQI
22nd Jul 20266710 AMAQI
22nd Jul 20267211 AMAQI
22nd Jul 20268712 PMAQI
22nd Jul 2026891 PMAQI
22nd Jul 2026922 PMAQI
22nd Jul 20261043 PMAQI
22nd Jul 20261104 PMAQI
22nd Jul 20261165 PMAQI
22nd Jul 20261056 PMAQI
22nd Jul 20261057 PMAQI
22nd Jul 2026968 PMAQI
22nd Jul 2026749 PMAQI
22nd Jul 20265910 PMAQI
22nd Jul 20265811 PMAQI
23rd Jul 20264212 AMAQI
23rd Jul 2026321 AMAQI
23rd Jul 2026292 AMAQI
23rd Jul 2026313 AMAQI

25°C21/31°C

23rd Jul 2026224 AMAQI
23rd Jul 2026185 AMAQI
23rd Jul 2026296 AMAQI
23rd Jul 2026477 AMAQI
23rd Jul 2026448 AMAQI
23rd Jul 2026389 AMAQI
23rd Jul 20262510 AMAQI
23rd Jul 20261411 AMAQI
23rd Jul 20261412 PMAQI
23rd Jul 2026161 PMAQI
23rd Jul 2026232 PMAQI
23rd Jul 2026253 PMAQI
23rd Jul 2026314 PMAQI
23rd Jul 2026275 PMAQI
23rd Jul 2026186 PMAQI
23rd Jul 2026197 PMAQI
23rd Jul 2026298 PMAQI
23rd Jul 2026289 PMAQI
23rd Jul 20261610 PMAQI
23rd Jul 20262311 PMAQI
24th Jul 20262912 AMAQI
24th Jul 2026311 AMAQI
24th Jul 2026172 AMAQI
24th Jul 2026293 AMAQI

25°C20/31°C

24th Jul 2026484 AMAQI
24th Jul 2026365 AMAQI
24th Jul 2026536 AMAQI
24th Jul 2026577 AMAQI
24th Jul 2026278 AMAQI
24th Jul 2026319 AMAQI
24th Jul 20262910 AMAQI
24th Jul 20263411 AMAQI
24th Jul 20261912 PMAQI
24th Jul 2026171 PMAQI
24th Jul 2026252 PMAQI
24th Jul 2026233 PMAQI
24th Jul 2026174 PMAQI
24th Jul 202685 PMAQI
24th Jul 2026126 PMAQI
24th Jul 2026197 PMAQI
24th Jul 2026128 PMAQI
24th Jul 2026219 PMAQI
24th Jul 20262310 PMAQI
24th Jul 20262311 PMAQI
25th Jul 20262312 AMAQI
25th Jul 2026211 AMAQI
25th Jul 2026212 AMAQI
25th Jul 2026213 AMAQI

21°C20/25°C

25th Jul 2026214 AMAQI
25th Jul 2026255 AMAQI
25th Jul 2026236 AMAQI
25th Jul 2026237 AMAQI
25th Jul 2026258 AMAQI
25th Jul 2026239 AMAQI
25th Jul 20262110 AMAQI
25th Jul 20262511 AMAQI
25th Jul 20262712 PMAQI
25th Jul 2026231 PMAQI
25th Jul 2026212 PMAQI
25th Jul 2026273 PMAQI
25th Jul 2026194 PMAQI
25th Jul 2026255 PMAQI
25th Jul 2026256 PMAQI
25th Jul 2026237 PMAQI
25th Jul 2026218 PMAQI
25th Jul 2026199 PMAQI
25th Jul 20262310 PMAQI
25th Jul 20262311 PMAQI
26th Jul 20261912 AMAQI
26th Jul 2026171 AMAQI
26th Jul 2026252 AMAQI
26th Jul 2026253 AMAQI

21°C20/24°C

26th Jul 2026214 AMAQI
26th Jul 2026195 AMAQI
26th Jul 2026196 AMAQI
26th Jul 2026197 AMAQI
26th Jul 2026218 AMAQI
26th Jul 2026199 AMAQI
26th Jul 20262110 AMAQI
26th Jul 20262511 AMAQI
26th Jul 20262112 PMAQI
26th Jul 2026251 PMAQI
26th Jul 2026252 PMAQI
26th Jul 2026213 PMAQI
26th Jul 2026194 PMAQI
26th Jul 2026175 PMAQI
26th Jul 2026176 PMAQI
26th Jul 2026197 PMAQI
26th Jul 2026178 PMAQI
26th Jul 2026179 PMAQI
26th Jul 20262110 PMAQI
26th Jul 20261911 PMAQI
27th Jul 20261712 AMAQI
27th Jul 2026141 AMAQI
27th Jul 2026172 AMAQI
27th Jul 2026143 AMAQI

20°C19/21°C

27th Jul 2026144 AMAQI
27th Jul 2026175 AMAQI
27th Jul 2026146 AMAQI
27th Jul 2026177 AMAQI
27th Jul 2026178 AMAQI
27th Jul 2026199 AMAQI
27th Jul 20261910 AMAQI
27th Jul 20261711 AMAQI
27th Jul 20261412 PMAQI
27th Jul 2026171 PMAQI
27th Jul 2026142 PMAQI
27th Jul 2026173 PMAQI
27th Jul 2026124 PMAQI
27th Jul 2026175 PMAQI
27th Jul 2026196 PMAQI
27th Jul 2026147 PMAQI
27th Jul 2026178 PMAQI
27th Jul 2026199 PMAQI
27th Jul 20261410 PMAQI
27th Jul 20261411 PMAQI
28th Jul 20261712 AMAQI
28th Jul 2026211 AMAQI
28th Jul 2026212 AMAQI
28th Jul 2026213 AMAQI

21°C18/25°C

28th Jul 2026234 AMAQI
28th Jul 2026215 AMAQI
28th Jul 2026216 AMAQI
28th Jul 2026237 AMAQI
28th Jul 2026238 AMAQI
28th Jul 2026219 AMAQI
28th Jul 20262310 AMAQI
28th Jul 20262311 AMAQI
28th Jul 20262512 PMAQI
28th Jul 2026231 PMAQI
28th Jul 2026252 PMAQI
28th Jul 2026293 PMAQI
28th Jul 2026294 PMAQI
28th Jul 2026315 PMAQI
28th Jul 2026336 PMAQI
28th Jul 2026297 PMAQI
28th Jul 2026338 PMAQI
28th Jul 2026319 PMAQI
28th Jul 20263110 PMAQI
28th Jul 20263811 PMAQI
29th Jul 20263612 AMAQI
29th Jul 2026331 AMAQI
29th Jul 2026312 AMAQI
29th Jul 2026333 AMAQI

21°C17/26°C

29th Jul 2026314 AMAQI
29th Jul 2026315 AMAQI
29th Jul 2026296 AMAQI
29th Jul 2026317 AMAQI
29th Jul 2026298 AMAQI
29th Jul 2026259 AMAQI
29th Jul 20262510 AMAQI
29th Jul 20262511 AMAQI
29th Jul 20262112 PMAQI
29th Jul 2026231 PMAQI
29th Jul 2026232 PMAQI
29th Jul 2026253 PMAQI
29th Jul 2026254 PMAQI
29th Jul 2026255 PMAQI
29th Jul 2026276 PMAQI
29th Jul 2026237 PMAQI
29th Jul 2026258 PMAQI
29th Jul 2026219 PMAQI
29th Jul 20262110 PMAQI
29th Jul 20262111 PMAQI
30th Jul 20262112 AMAQI
30th Jul 2026231 AMAQI
30th Jul 2026212 AMAQI
30th Jul 2026213 AMAQI

20°C19/23°C

30th Jul 2026214 AMAQI
30th Jul 2026215 AMAQI
30th Jul 2026236 AMAQI
30th Jul 2026237 AMAQI
30th Jul 2026238 AMAQI
30th Jul 2026279 AMAQI
30th Jul 20262710 AMAQI
30th Jul 20262911 AMAQI
30th Jul 20263112 PMAQI
30th Jul 2026331 PMAQI
30th Jul 2026332 PMAQI
30th Jul 2026343 PMAQI
30th Jul 2026334 PMAQI
30th Jul 2026295 PMAQI
30th Jul 2026336 PMAQI
30th Jul 2026297 PMAQI
30th Jul 2026298 PMAQI
30th Jul 2026299 PMAQI
30th Jul 20262910 PMAQI
30th Jul 20263311 PMAQI
31st Jul 20262912 AMAQI
31st Jul 2026271 AMAQI
31st Jul 2026292 AMAQI
31st Jul 2026363 AMAQI

22°C19/26°C

31st Jul 2026404 AMAQI
31st Jul 2026385 AMAQI
31st Jul 2026366 AMAQI
31st Jul 2026337 AMAQI
31st Jul 2026338 AMAQI
31st Jul 2026339 AMAQI
31st Jul 20263310 AMAQI
31st Jul 20263311 AMAQI
31st Jul 20262912 PMAQI
31st Jul 2026311 PMAQI
31st Jul 2026292 PMAQI
31st Jul 2026313 PMAQI
31st Jul 2026274 PMAQI
31st Jul 2026255 PMAQI
31st Jul 2026256 PMAQI
31st Jul 2026297 PMAQI
31st Jul 2026278 PMAQI
31st Jul 2026259 PMAQI
31st Jul 20262510 PMAQI
31st Jul 20262511 PMAQI
1st Aug 20262512 AMAQI
1st Aug 2026231 AMAQI
1st Aug 2026252 AMAQI
1st Aug 2026233 AMAQI

21°C19/24°C

1st Aug 2026234 AMAQI
1st Aug 2026295 AMAQI
1st Aug 2026296 AMAQI
1st Aug 2026297 AMAQI
1st Aug 2026348 AMAQI
1st Aug 2026369 AMAQI
1st Aug 20263610 AMAQI
1st Aug 20263811 AMAQI
1st Aug 20263612 PMAQI
1st Aug 2026381 PMAQI
1st Aug 2026362 PMAQI
1st Aug 2026363 PMAQI
1st Aug 2026444 PMAQI
1st Aug 2026445 PMAQI
1st Aug 2026406 PMAQI
1st Aug 2026447 PMAQI
1st Aug 2026448 PMAQI
1st Aug 2026489 PMAQI
1st Aug 20265010 PMAQI
1st Aug 20265211 PMAQI
2nd Aug 20265212 AMAQI
2nd Aug 2026541 AMAQI
2nd Aug 2026532 AMAQI
2nd Aug 2026523 AMAQI

23°C20/25°C

2nd Aug 2026544 AMAQI
2nd Aug 2026555 AMAQI
2nd Aug 2026526 AMAQI
2nd Aug 2026537 AMAQI
2nd Aug 2026558 AMAQI
2nd Aug 2026559 AMAQI
2nd Aug 20265410 AMAQI
2nd Aug 20265211 AMAQI
2nd Aug 20265212 PMAQI
2nd Aug 2026481 PMAQI
2nd Aug 2026462 PMAQI
2nd Aug 2026423 PMAQI
2nd Aug 2026404 PMAQI
2nd Aug 202665 PMAQI
2nd Aug 2026126 PMAQI
2nd Aug 2026257 PMAQI
2nd Aug 2026198 PMAQI
2nd Aug 2026179 PMAQI
2nd Aug 2026810 PMAQI
2nd Aug 20261711 PMAQI
3rd Aug 2026812 AMAQI
3rd Aug 2026121 AMAQI
3rd Aug 202682 AMAQI
3rd Aug 2026123 AMAQI

21°C18/24°C

3rd Aug 202684 AMAQI
3rd Aug 202685 AMAQI
3rd Aug 2026146 AMAQI
3rd Aug 2026127 AMAQI
3rd Aug 2026178 AMAQI
3rd Aug 2026199 AMAQI
3rd Aug 20261710 AMAQI
3rd Aug 20261911 AMAQI
3rd Aug 20262112 PMAQI
3rd Aug 202681 PMAQI
3rd Aug 2026172 PMAQI
3rd Aug 2026213 PMAQI
3rd Aug 2026194 PMAQI
3rd Aug 2026105 PMAQI
3rd Aug 2026126 PMAQI
3rd Aug 2026367 PMAQI
3rd Aug 2026238 PMAQI
3rd Aug 2026339 PMAQI
3rd Aug 20262110 PMAQI
3rd Aug 20263811 PMAQI
4th Aug 20261712 AMAQI
4th Aug 2026231 AMAQI
4th Aug 2026232 AMAQI
4th Aug 2026253 AMAQI

18°C15/20°C

4th Aug 2026234 AMAQI
4th Aug 2026215 AMAQI
4th Aug 2026236 AMAQI
4th Aug 2026257 AMAQI
4th Aug 2026278 AMAQI
4th Aug 2026259 AMAQI
4th Aug 20262510 AMAQI
4th Aug 20262911 AMAQI
4th Aug 20262912 PMAQI
4th Aug 2026291 PMAQI
4th Aug 2026312 PMAQI
4th Aug 2026313 PMAQI
4th Aug 2026294 PMAQI
4th Aug 2026315 PMAQI
4th Aug 2026386 PMAQI
4th Aug 2026367 PMAQI
4th Aug 2026408 PMAQI
4th Aug 2026409 PMAQI
4th Aug 20264010 PMAQI
4th Aug 20263811 PMAQI
5th Aug 20264212 AMAQI
5th Aug 2026421 AMAQI
5th Aug 2026462 AMAQI
5th Aug 2026443 AMAQI

19°C13/26°C

5th Aug 2026484 AMAQI
5th Aug 2026425 AMAQI
5th Aug 2026406 AMAQI
5th Aug 2026427 AMAQI
5th Aug 2026428 AMAQI
5th Aug 2026469 AMAQI
5th Aug 20264610 AMAQI
5th Aug 20264911 AMAQI
5th Aug 20264612 PMAQI
5th Aug 2026461 PMAQI
5th Aug 2026422 PMAQI
5th Aug 2026423 PMAQI
5th Aug 2026484 PMAQI
5th Aug 2026445 PMAQI
5th Aug 2026466 PMAQI
5th Aug 2026507 PMAQI
5th Aug 2026488 PMAQI
5th Aug 2026529 PMAQI
5th Aug 20265110 PMAQI
5th Aug 20265011 PMAQI
6th Aug 20265012 AMAQI
6th Aug 2026501 AMAQI
6th Aug 2026502 AMAQI
6th Aug 2026523 AMAQI

21°C13/29°C

6th Aug 2026534 AMAQI
6th Aug 2026515 AMAQI
6th Aug 2026516 AMAQI
6th Aug 2026487 AMAQI
6th Aug 2026488 AMAQI
6th Aug 2026489 AMAQI
6th Aug 20264610 AMAQI
6th Aug 20264611 AMAQI
6th Aug 20264212 PMAQI
6th Aug 2026441 PMAQI
6th Aug 2026422 PMAQI
6th Aug 2026423 PMAQI
6th Aug 2026424 PMAQI
6th Aug 2026405 PMAQI
6th Aug 2026386 PMAQI
6th Aug 2026367 PMAQI
6th Aug 2026338 PMAQI
6th Aug 2026389 PMAQI
6th Aug 20264210 PMAQI
6th Aug 20264211 PMAQI
7th Aug 20264212 AMAQI
7th Aug 2026421 AMAQI
7th Aug 2026402 AMAQI
7th Aug 2026383 AMAQI

24°C17/32°C

7th Aug 2026424 AMAQI
7th Aug 2026425 AMAQI
7th Aug 2026426 AMAQI
7th Aug 2026387 AMAQI
7th Aug 2026408 AMAQI
7th Aug 2026409 AMAQI
7th Aug 20264210 AMAQI
7th Aug 20264211 AMAQI
7th Aug 20263612 PMAQI
7th Aug 2026471 PMAQI
7th Aug 2026422 PMAQI
7th Aug 2026443 PMAQI
7th Aug 2026404 PMAQI
7th Aug 2026465 PMAQI
7th Aug 2026426 PMAQI
7th Aug 2026467 PMAQI
7th Aug 2026448 PMAQI
7th Aug 2026449 PMAQI
7th Aug 20264410 PMAQI
7th Aug 20264411 PMAQI
8th Aug 20264612 AMAQI
8th Aug 2026461 AMAQI
8th Aug 2026402 AMAQI
8th Aug 2026443 AMAQI

25°C21/31°C

8th Aug 2026424 AMAQI
8th Aug 2026385 AMAQI
8th Aug 2026426 AMAQI
8th Aug 2026387 AMAQI
8th Aug 2026388 AMAQI
8th Aug 2026429 AMAQI
8th Aug 20264010 AMAQI
8th Aug 20264211 AMAQI
8th Aug 20264012 PMAQI
8th Aug 2026401 PMAQI
8th Aug 2026442 PMAQI
8th Aug 2026423 PMAQI
8th Aug 2026384 PMAQI
8th Aug 2026365 PMAQI
8th Aug 2026366 PMAQI
8th Aug 2026367 PMAQI
8th Aug 2026368 PMAQI
8th Aug 2026369 PMAQI
8th Aug 20263410 PMAQI
8th Aug 20262911 PMAQI
9th Aug 20263312 AMAQI
9th Aug 2026311 AMAQI
9th Aug 2026312 AMAQI
9th Aug 2026313 AMAQI

24°C20/30°C

9th Aug 2026294 AMAQI
9th Aug 2026295 AMAQI
9th Aug 2026276 AMAQI
9th Aug 2026297 AMAQI
9th Aug 2026298 AMAQI
9th Aug 2026299 AMAQI
9th Aug 20262910 AMAQI
9th Aug 20262711 AMAQI
9th Aug 20262912 PMAQI
9th Aug 2026311 PMAQI
9th Aug 2026362 PMAQI
9th Aug 2026333 PMAQI
9th Aug 2026334 PMAQI
9th Aug 2026335 PMAQI
9th Aug 2026296 PMAQI
9th Aug 2026297 PMAQI
9th Aug 2026318 PMAQI
9th Aug 2026299 PMAQI
9th Aug 20262910 PMAQI
9th Aug 20262911 PMAQI
10th Aug 20262712 AMAQI
10th Aug 2026271 AMAQI
10th Aug 2026272 AMAQI
10th Aug 2026253 AMAQI

23°C20/27°C

10th Aug 2026274 AMAQI
10th Aug 2026255 AMAQI
10th Aug 2026276 AMAQI
10th Aug 2026277 AMAQI
10th Aug 2026298 AMAQI
10th Aug 2026299 AMAQI
10th Aug 20262910 AMAQI
10th Aug 20262911 AMAQI
10th Aug 20262712 PMAQI
10th Aug 2026251 PMAQI
10th Aug 2026252 PMAQI
10th Aug 2026233 PMAQI
10th Aug 2026234 PMAQI
10th Aug 2026275 PMAQI
10th Aug 2026276 PMAQI
10th Aug 2026257 PMAQI
10th Aug 2026278 PMAQI
10th Aug 2026349 PMAQI
10th Aug 20263310 PMAQI
10th Aug 20263611 PMAQI
11th Aug 20263612 AMAQI
11th Aug 2026361 AMAQI
11th Aug 2026332 AMAQI
11th Aug 2026363 AMAQI

22°C18/29°C

11th Aug 2026364 AMAQI
11th Aug 2026385 AMAQI
11th Aug 2026366 AMAQI
11th Aug 2026387 AMAQI
11th Aug 2026368 AMAQI
11th Aug 2026389 AMAQI
11th Aug 20264010 AMAQI
11th Aug 20263611 AMAQI
11th Aug 20263312 PMAQI
11th Aug 2026381 PMAQI
11th Aug 2026402 PMAQI
11th Aug 2026423 PMAQI
11th Aug 2026424 PMAQI
11th Aug 2026335 PMAQI
11th Aug 2026336 PMAQI
11th Aug 2026337 PMAQI
11th Aug 2026318 PMAQI
11th Aug 2026339 PMAQI
11th Aug 20263110 PMAQI
11th Aug 20262711 PMAQI
12th Aug 20262712 AMAQI
12th Aug 2026251 AMAQI
12th Aug 2026252 AMAQI
12th Aug 2026253 AMAQI

19°C16/20°C

12th Aug 2026214 AMAQI
12th Aug 2026215 AMAQI
12th Aug 2026216 AMAQI
12th Aug 2026217 AMAQI
12th Aug 2026218 AMAQI
12th Aug 2026219 AMAQI
12th Aug 20262310 AMAQI
12th Aug 20262111 AMAQI
12th Aug 20262312 PMAQI
12th Aug 2026251 PMAQI
12th Aug 2026272 PMAQI
12th Aug 2026323 PMAQI
12th Aug 2026324 PMAQI
12th Aug 2026275 PMAQI
12th Aug 2026296 PMAQI
12th Aug 2026257 PMAQI
12th Aug 2026258 PMAQI
12th Aug 2026279 PMAQI
12th Aug 20262510 PMAQI
12th Aug 20262311 PMAQI
13th Aug 20262312 AMAQI
13th Aug 2026231 AMAQI
13th Aug 2026252 AMAQI
13th Aug 2026233 AMAQI

22°C19/26°C

13th Aug 2026294 AMAQI
13th Aug 2026235 AMAQI
13th Aug 2026216 AMAQI
13th Aug 2026277 AMAQI
13th Aug 2026318 AMAQI
13th Aug 2026259 AMAQI
13th Aug 20262510 AMAQI
13th Aug 20262711 AMAQI
13th Aug 20262712 PMAQI
13th Aug 2026311 PMAQI
13th Aug 2026212 PMAQI
13th Aug 2026273 PMAQI
13th Aug 2026214 PMAQI
13th Aug 2026215 PMAQI
13th Aug 2026256 PMAQI
13th Aug 2026257 PMAQI
13th Aug 2026278 PMAQI
13th Aug 2026279 PMAQI
13th Aug 20262310 PMAQI
13th Aug 20262711 PMAQI
14th Aug 20262512 AMAQI
14th Aug 2026251 AMAQI
14th Aug 2026232 AMAQI
14th Aug 2026213 AMAQI

22°C19/27°C

14th Aug 2026194 AMAQI
4 AM
14th Aug 2026235 AMAQI
14th Aug 2026256 AMAQI
14th Aug 2026237 AMAQI
14th Aug 2026258 AMAQI
14th Aug 2026219 AMAQI
14th Aug 20261610 AMAQI
14th Aug 20261411 AMAQI
11 AM
14th Aug 20262112 PMAQI
14th Aug 2026211 PMAQI
14th Aug 2026232 PMAQI
14th Aug 2026233 PMAQI
14th Aug 2026234 PMAQI
14th Aug 2026195 PMAQI
14th Aug 2026216 PMAQI
6 PM
14th Aug 2026177 PMAQI
14th Aug 2026238 PMAQI
14th Aug 2026219 PMAQI
14th Aug 20262110 PMAQI
14th Aug 20262511 PMAQI
11 PM
3 AM

23°C19/29°C

Day time
Avg. Highest Time
4 AM - 4 PM

35AQI

13 hours / Day
390 hours / Month
Avg. Lowest Time
5 AM

33AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 4 PM (Avg. 35), while the lowest AQI was between 5 AM to 5 AM (Avg. 33).
Night time
Avg. Highest Time
7 PM

37AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
2 AM

32AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 7 PM (Avg. 37), while the lowest AQI was between 2 AM to 2 AM (Avg. 32).

2026 Days Vs Air Quality

Koyacho, Kawaii, Yamagata, Japan

2026

86%

194

14%

32

Total number of days with different AQI categories in last 226 days in 2026 (139 days remaining)

Good
194 Days
Moderate
32 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 86%

Health Risk Level:

Low

In 2026, 86% of 226 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 2026

AQI (US)
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 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
19AQI (US)
2nd January 2026
17AQI (US)
3rd January 2026
20AQI (US)
4th January 2026
22AQI (US)
5th January 2026
23AQI (US)
6th January 2026
20AQI (US)
7th January 2026
31AQI (US)
8th January 2026
24AQI (US)
9th January 2026
11AQI (US)
10th January 2026
28AQI (US)
11th January 2026
28AQI (US)
12th January 2026
15AQI (US)
13th January 2026
17AQI (US)
14th January 2026
14AQI (US)
15th January 2026
22AQI (US)
16th January 2026
31AQI (US)
17th January 2026
40AQI (US)
18th January 2026
23AQI (US)
19th January 2026
38AQI (US)
20th January 2026
17AQI (US)
21st January 2026
15AQI (US)
22nd January 2026
27AQI (US)
23rd January 2026
51AQI (US)
24th January 2026
49AQI (US)
25th January 2026
42AQI (US)
26th January 2026
30AQI (US)
27th January 2026
41AQI (US)
28th January 2026
26AQI (US)
29th January 2026
21AQI (US)
30th January 2026
36AQI (US)
31st January 2026
39AQI (US)
1st February 2026
39AQI (US)
2nd February 2026
46AQI (US)
3rd February 2026
32AQI (US)
4th February 2026
20AQI (US)
5th February 2026
19AQI (US)
6th February 2026
24AQI (US)
7th February 2026
13AQI (US)
8th February 2026
22AQI (US)
9th February 2026
44AQI (US)
10th February 2026
53AQI (US)
11th February 2026
70AQI (US)
12th February 2026
29AQI (US)
13th February 2026
30AQI (US)
14th February 2026
63AQI (US)
15th February 2026
59AQI (US)
16th February 2026
47AQI (US)
17th February 2026
17AQI (US)
18th February 2026
31AQI (US)
19th February 2026
30AQI (US)
20th February 2026
31AQI (US)
21st February 2026
49AQI (US)
22nd February 2026
43AQI (US)
23rd February 2026
37AQI (US)
24th February 2026
32AQI (US)
25th February 2026
20AQI (US)
26th February 2026
16AQI (US)
27th February 2026
41AQI (US)
28th February 2026
43AQI (US)
1st March 2026
52AQI (US)
2nd March 2026
71AQI (US)
3rd March 2026
48AQI (US)
4th March 2026
75AQI (US)
5th March 2026
67AQI (US)
6th March 2026
58AQI (US)
7th March 2026
49AQI (US)
8th March 2026
54AQI (US)
9th March 2026
41AQI (US)
10th March 2026
24AQI (US)
11th March 2026
56AQI (US)
12th March 2026
69AQI (US)
13th March 2026
47AQI (US)
14th March 2026
49AQI (US)
15th March 2026
62AQI (US)
16th March 2026
58AQI (US)
17th March 2026
42AQI (US)
18th March 2026
51AQI (US)
19th March 2026
43AQI (US)
20th March 2026
29AQI (US)
21st March 2026
49AQI (US)
22nd March 2026
44AQI (US)
23rd March 2026
40AQI (US)
24th March 2026
68AQI (US)
25th March 2026
59AQI (US)
26th March 2026
36AQI (US)
27th March 2026
13AQI (US)
28th March 2026
52AQI (US)
29th March 2026
72AQI (US)
30th March 2026
65AQI (US)
31st March 2026
41AQI (US)
1st April 2026
19AQI (US)
2nd April 2026
18AQI (US)
3rd April 2026
49AQI (US)
4th April 2026
46AQI (US)
5th April 2026
18AQI (US)
6th April 2026
18AQI (US)
7th April 2026
28AQI (US)
8th April 2026
15AQI (US)
9th April 2026
22AQI (US)
10th April 2026
45AQI (US)
11th April 2026
38AQI (US)
12th April 2026
33AQI (US)
13th April 2026
34AQI (US)
14th April 2026
45AQI (US)
15th April 2026
44AQI (US)
16th April 2026
22AQI (US)
17th April 2026
21AQI (US)
18th April 2026
37AQI (US)
19th April 2026
40AQI (US)
20th April 2026
35AQI (US)
21st April 2026
33AQI (US)
22nd April 2026
20AQI (US)
23rd April 2026
21AQI (US)
24th April 2026
28AQI (US)
25th April 2026
24AQI (US)
26th April 2026
46AQI (US)
27th April 2026
31AQI (US)
28th April 2026
25AQI (US)
29th April 2026
23AQI (US)
30th April 2026
40AQI (US)
1st May 2026
41AQI (US)
2nd May 2026
22AQI (US)
3rd May 2026
30AQI (US)
4th May 2026
23AQI (US)
5th May 2026
20AQI (US)
6th May 2026
36AQI (US)
7th May 2026
36AQI (US)
8th May 2026
23AQI (US)
9th May 2026
15AQI (US)
10th May 2026
20AQI (US)
11th May 2026
37AQI (US)
12th May 2026
42AQI (US)
13th May 2026
45AQI (US)
14th May 2026
33AQI (US)
15th May 2026
27AQI (US)
16th May 2026
83AQI (US)
17th May 2026
68AQI (US)
18th May 2026
53AQI (US)
19th May 2026
48AQI (US)
20th May 2026
62AQI (US)
21st May 2026
61AQI (US)
22nd May 2026
62AQI (US)
23rd May 2026
55AQI (US)
24th May 2026
59AQI (US)
25th May 2026
49AQI (US)
26th May 2026
41AQI (US)
27th May 2026
27AQI (US)
28th May 2026
26AQI (US)
29th May 2026
23AQI (US)
30th May 2026
23AQI (US)
31st May 2026
26AQI (US)
1st June 2026
28AQI (US)
2nd June 2026
36AQI (US)
3rd June 2026
26AQI (US)
4th June 2026
13AQI (US)
5th June 2026
23AQI (US)
6th June 2026
23AQI (US)
7th June 2026
21AQI (US)
8th June 2026
21AQI (US)
9th June 2026
22AQI (US)
10th June 2026
22AQI (US)
11th June 2026
24AQI (US)
12th June 2026
25AQI (US)
13th June 2026
26AQI (US)
14th June 2026
24AQI (US)
15th June 2026
26AQI (US)
16th June 2026
25AQI (US)
17th June 2026
29AQI (US)
18th June 2026
26AQI (US)
19th June 2026
29AQI (US)
20th June 2026
22AQI (US)
21st June 2026
19AQI (US)
22nd June 2026
18AQI (US)
23rd June 2026
21AQI (US)
24th June 2026
21AQI (US)
25th June 2026
28AQI (US)
26th June 2026
28AQI (US)
27th June 2026
27AQI (US)
28th June 2026
29AQI (US)
29th June 2026
29AQI (US)
30th June 2026
29AQI (US)
1st July 2026
25AQI (US)
2nd July 2026
25AQI (US)
3rd July 2026
20AQI (US)
4th July 2026
21AQI (US)
5th July 2026
22AQI (US)
6th July 2026
22AQI (US)
7th July 2026
25AQI (US)
8th July 2026
24AQI (US)
9th July 2026
25AQI (US)
10th July 2026
31AQI (US)
11th July 2026
30AQI (US)
12th July 2026
26AQI (US)
13th July 2026
22AQI (US)
14th July 2026
27AQI (US)
15th July 2026
25AQI (US)
16th July 2026
28AQI (US)
17th July 2026
38AQI (US)
18th July 2026
40AQI (US)
19th July 2026
33AQI (US)
20th July 2026
75AQI (US)
21st July 2026
75AQI (US)
22nd July 2026
71AQI (US)
23rd July 2026
27AQI (US)
24th July 2026
27AQI (US)
25th July 2026
23AQI (US)
26th July 2026
20AQI (US)
27th July 2026
16AQI (US)
28th July 2026
26AQI (US)
29th July 2026
27AQI (US)
30th July 2026
27AQI (US)
31st July 2026
30AQI (US)
1st August 2026
36AQI (US)
2nd August 2026
41AQI (US)
3rd August 2026
17AQI (US)
4th August 2026
29AQI (US)
5th August 2026
46AQI (US)
6th August 2026
45AQI (US)
7th August 2026
42AQI (US)
8th August 2026
39AQI (US)
9th August 2026
30AQI (US)
10th August 2026
28AQI (US)
11th August 2026
36AQI (US)
12th August 2026
25AQI (US)
13th August 2026
25AQI (US)
14th August 2026
22AQI (US)
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

27AQI (US)

36AQI (US)

51AQI (US)

31AQI (US)

39AQI (US)

25AQI (US)

31AQI (US)

33AQI (US)

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202634AQI (US)

30
1
24
4
15
16
30
23
8
30
28
3
14
194
32

Highest AQI (US) recorded in

March

51AQI (US)

Lowest AQI (US) recorded in

June

25AQI (US)

202539AQI (US)

30
1
27
1
24
7
29
1
27
4
24
6
18
13
28
3
30
14
17
30
28
3
309
56

Highest AQI (US) recorded in

July

51AQI (US)

Lowest AQI (US) recorded in

December

32AQI (US)

202438AQI (US)

31
28
1
26
5
13
17
27
4
20
10
24
7
31
29
1
31
27
3
31
318
48

Highest AQI (US) recorded in

April

52AQI (US)

Lowest AQI (US) recorded in

December

25AQI (US)

202347AQI (US)

28
2
27
1
24
7
23
7
26
5
20
10
11
20
11
20
7
23
13
18
11
18
30
1
231
132

Highest AQI (US) recorded in

September

58AQI (US)

Lowest AQI (US) recorded in

January

34AQI (US)

202235AQI (US)

29
21
28
3
16
1
24
7
23
7
21
1
28
29
2
27
3
31
278
23

Highest AQI (US) recorded in

May

42AQI (US)

Lowest AQI (US) recorded in

December

26AQI (US)

202132AQI (US)

29
1
26
2
29
18
3
27
4
25
5
26
5
30
1
30
31
30
31
332
21

Highest AQI (US) recorded in

June

41AQI (US)

Lowest AQI (US) recorded in

April

26AQI (US)

202028AQI (US)

13
20
1
18
28
2
30
1
20
10
1
19
31
29
1
31
239
15
1

Highest AQI (US) recorded in

August

47AQI (US)

Lowest AQI (US) recorded in

December

18AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
47AQI (US)
Least Polluted Year Recorded
2020(Avg.)
28AQI (US)

Koyacho's annual 2026 AQI (US) (34) shows an average percentage change of -4.3% (improved AQI (US)) compared to previous years: 2020 (28), 2021 (32), 2022 (35), 2023 (47), 2024 (38), 2025 (39).