Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Nagano, Nagano, 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

Nagano, Nagano, Japan

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
4th Aug 2024
62AQI
Lowest AQI recorded on
18th Aug 2021
17AQI

Same Day Analysis (20th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 47 of Good air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 20th Aug - 21st Aug 2025

Nagano, Nagano, Japan

AQI
Day
Night
.

4 AM20th Aug 2025

6 PM

3 AM21st Aug 2025

Day time
Avg. Highest Time
2PM20th Aug

57AQI

Avg. Lowest Time
5AM20th Aug

43AQI

Night time
Avg. Highest Time
8PM20th Aug

56AQI

Avg. Lowest Time
3AM21st Aug

43AQI

In the last 24 hours,

Nagano's AQI reached its highest point of 57 at 2 PM during the Day, while the lowest point, 43, was recorded at 3 AM during the Night between 20th Aug and 21st Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Nagano, Nagano, Japan

JulAug
22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st
Day
Night
22nd Jul 2025404 AMAQI
22nd Jul 2025415 AMAQI
22nd Jul 2025406 AMAQI
22nd Jul 2025407 AMAQI
22nd Jul 2025418 AMAQI
22nd Jul 2025439 AMAQI
22nd Jul 20254910 AMAQI
22nd Jul 20255111 AMAQI
22nd Jul 20255312 PMAQI
22nd Jul 2025541 PMAQI
22nd Jul 2025532 PMAQI
22nd Jul 2025533 PMAQI
22nd Jul 2025504 PMAQI
22nd Jul 2025535 PMAQI
22nd Jul 2025546 PMAQI
22nd Jul 2025497 PMAQI
22nd Jul 2025428 PMAQI
22nd Jul 2025419 PMAQI
22nd Jul 20253910 PMAQI
22nd Jul 20253811 PMAQI
23rd Jul 20254112 AMAQI
23rd Jul 2025401 AMAQI
23rd Jul 2025392 AMAQI
23rd Jul 2025393 AMAQI

23°C15/32°C

23rd Jul 2025404 AMAQI
23rd Jul 2025425 AMAQI
23rd Jul 2025426 AMAQI
23rd Jul 2025427 AMAQI
23rd Jul 2025428 AMAQI
23rd Jul 2025489 AMAQI
23rd Jul 20255410 AMAQI
23rd Jul 20255511 AMAQI
23rd Jul 20255512 PMAQI
23rd Jul 2025561 PMAQI
23rd Jul 2025542 PMAQI
23rd Jul 2025523 PMAQI
23rd Jul 2025554 PMAQI
23rd Jul 2025545 PMAQI
23rd Jul 2025546 PMAQI
23rd Jul 2025487 PMAQI
23rd Jul 2025368 PMAQI
23rd Jul 2025389 PMAQI
23rd Jul 20253810 PMAQI
23rd Jul 20253511 PMAQI
24th Jul 20253512 AMAQI
24th Jul 2025341 AMAQI
24th Jul 2025412 AMAQI
24th Jul 2025413 AMAQI

24°C17/32°C

24th Jul 2025424 AMAQI
24th Jul 2025445 AMAQI
24th Jul 2025446 AMAQI
24th Jul 2025447 AMAQI
24th Jul 2025448 AMAQI
24th Jul 2025429 AMAQI
24th Jul 20254510 AMAQI
24th Jul 20254811 AMAQI
24th Jul 20256212 PMAQI
24th Jul 2025571 PMAQI
24th Jul 2025562 PMAQI
24th Jul 2025553 PMAQI
24th Jul 2025544 PMAQI
24th Jul 2025565 PMAQI
24th Jul 2025596 PMAQI
24th Jul 2025617 PMAQI
24th Jul 2025578 PMAQI
24th Jul 2025529 PMAQI
24th Jul 20255310 PMAQI
24th Jul 20255011 PMAQI
25th Jul 20254512 AMAQI
25th Jul 2025401 AMAQI
25th Jul 2025412 AMAQI
25th Jul 2025403 AMAQI

23°C14/33°C

25th Jul 2025424 AMAQI
25th Jul 2025455 AMAQI
25th Jul 2025456 AMAQI
25th Jul 2025447 AMAQI
25th Jul 2025458 AMAQI
25th Jul 2025509 AMAQI
25th Jul 20255010 AMAQI
25th Jul 20254611 AMAQI
25th Jul 20254612 PMAQI
25th Jul 2025501 PMAQI
25th Jul 2025502 PMAQI
25th Jul 2025513 PMAQI
25th Jul 2025544 PMAQI
25th Jul 2025555 PMAQI
25th Jul 2025536 PMAQI
25th Jul 2025527 PMAQI
25th Jul 2025508 PMAQI
25th Jul 2025509 PMAQI
25th Jul 20255010 PMAQI
25th Jul 20255011 PMAQI
26th Jul 20255112 AMAQI
26th Jul 2025471 AMAQI
26th Jul 2025442 AMAQI
26th Jul 2025443 AMAQI

23°C15/34°C

26th Jul 2025454 AMAQI
26th Jul 2025445 AMAQI
26th Jul 2025446 AMAQI
26th Jul 2025457 AMAQI
26th Jul 2025458 AMAQI
26th Jul 2025459 AMAQI
26th Jul 20255110 AMAQI
26th Jul 20255311 AMAQI
26th Jul 20254712 PMAQI
26th Jul 2025421 PMAQI
26th Jul 2025482 PMAQI
26th Jul 2025533 PMAQI
26th Jul 2025534 PMAQI
26th Jul 2025475 PMAQI
26th Jul 2025416 PMAQI
26th Jul 2025437 PMAQI
26th Jul 2025388 PMAQI
26th Jul 2025469 PMAQI
26th Jul 20254410 PMAQI
26th Jul 20254411 PMAQI
27th Jul 20254512 AMAQI
27th Jul 2025471 AMAQI
27th Jul 2025462 AMAQI
27th Jul 2025473 AMAQI

24°C14/34°C

27th Jul 2025474 AMAQI
27th Jul 2025475 AMAQI
27th Jul 2025486 AMAQI
27th Jul 2025487 AMAQI
27th Jul 2025488 AMAQI
27th Jul 2025399 AMAQI
27th Jul 20253610 AMAQI
27th Jul 20254211 AMAQI
27th Jul 20254212 PMAQI
27th Jul 2025401 PMAQI
27th Jul 2025392 PMAQI
27th Jul 2025443 PMAQI
27th Jul 2025414 PMAQI
27th Jul 2025385 PMAQI
27th Jul 2025366 PMAQI
27th Jul 2025367 PMAQI
27th Jul 2025388 PMAQI
27th Jul 2025449 PMAQI
27th Jul 20254310 PMAQI
27th Jul 20254411 PMAQI
28th Jul 20254512 AMAQI
28th Jul 2025451 AMAQI
28th Jul 2025472 AMAQI
28th Jul 2025473 AMAQI

24°C14/33°C

28th Jul 2025474 AMAQI
28th Jul 2025465 AMAQI
28th Jul 2025466 AMAQI
28th Jul 2025467 AMAQI
28th Jul 2025468 AMAQI
28th Jul 2025409 AMAQI
28th Jul 20254610 AMAQI
28th Jul 20254811 AMAQI
28th Jul 20254412 PMAQI
28th Jul 2025371 PMAQI
28th Jul 2025422 PMAQI
28th Jul 2025413 PMAQI
28th Jul 2025394 PMAQI
28th Jul 2025395 PMAQI
28th Jul 2025426 PMAQI
28th Jul 2025497 PMAQI
28th Jul 2025488 PMAQI
28th Jul 2025479 PMAQI
28th Jul 20254610 PMAQI
28th Jul 20254711 PMAQI
29th Jul 20254512 AMAQI
29th Jul 2025451 AMAQI
29th Jul 2025462 AMAQI
29th Jul 2025453 AMAQI

25°C19/32°C

29th Jul 2025464 AMAQI
29th Jul 2025455 AMAQI
29th Jul 2025456 AMAQI
29th Jul 2025457 AMAQI
29th Jul 2025458 AMAQI
29th Jul 2025589 AMAQI
29th Jul 20255910 AMAQI
29th Jul 20255911 AMAQI
29th Jul 20256012 PMAQI
29th Jul 2025611 PMAQI
29th Jul 2025622 PMAQI
29th Jul 2025633 PMAQI
29th Jul 2025624 PMAQI
29th Jul 2025585 PMAQI
29th Jul 2025566 PMAQI
29th Jul 2025547 PMAQI
29th Jul 2025508 PMAQI
29th Jul 2025459 PMAQI
29th Jul 20254010 PMAQI
29th Jul 20253811 PMAQI
30th Jul 20254012 AMAQI
30th Jul 2025431 AMAQI
30th Jul 2025452 AMAQI
30th Jul 2025463 AMAQI

24°C15/35°C

30th Jul 2025474 AMAQI
30th Jul 2025515 AMAQI
30th Jul 2025516 AMAQI
30th Jul 2025507 AMAQI
30th Jul 2025508 AMAQI
30th Jul 2025489 AMAQI
30th Jul 20255210 AMAQI
30th Jul 20255811 AMAQI
30th Jul 20255512 PMAQI
30th Jul 2025571 PMAQI
30th Jul 2025572 PMAQI
30th Jul 2025573 PMAQI
30th Jul 2025564 PMAQI
30th Jul 2025575 PMAQI
30th Jul 2025566 PMAQI
30th Jul 2025577 PMAQI
30th Jul 2025538 PMAQI
30th Jul 2025479 PMAQI
30th Jul 20254010 PMAQI
30th Jul 20254411 PMAQI
31st Jul 20254412 AMAQI
31st Jul 2025441 AMAQI
31st Jul 2025472 AMAQI
31st Jul 2025483 AMAQI

25°C15/34°C

31st Jul 2025484 AMAQI
31st Jul 2025485 AMAQI
31st Jul 2025486 AMAQI
31st Jul 2025487 AMAQI
31st Jul 2025488 AMAQI
31st Jul 2025489 AMAQI
31st Jul 20254810 AMAQI
31st Jul 20254311 AMAQI
31st Jul 20254312 PMAQI
31st Jul 2025451 PMAQI
31st Jul 2025492 PMAQI
31st Jul 2025483 PMAQI
31st Jul 2025494 PMAQI
31st Jul 2025465 PMAQI
31st Jul 2025416 PMAQI
31st Jul 2025367 PMAQI
31st Jul 2025428 PMAQI
31st Jul 2025509 PMAQI
31st Jul 20254110 PMAQI
31st Jul 20254011 PMAQI
1st Aug 20253712 AMAQI
1st Aug 2025451 AMAQI
1st Aug 2025402 AMAQI
1st Aug 2025433 AMAQI

25°C17/35°C

1st Aug 2025414 AMAQI
1st Aug 2025395 AMAQI
1st Aug 2025396 AMAQI
1st Aug 2025407 AMAQI
1st Aug 2025418 AMAQI
1st Aug 2025399 AMAQI
1st Aug 20253510 AMAQI
1st Aug 20255011 AMAQI
1st Aug 20255512 PMAQI
1st Aug 2025591 PMAQI
1st Aug 2025422 PMAQI
1st Aug 2025353 PMAQI
1st Aug 2025514 PMAQI
1st Aug 2025455 PMAQI
1st Aug 2025526 PMAQI
1st Aug 2025407 PMAQI
1st Aug 2025418 PMAQI
1st Aug 2025439 PMAQI
1st Aug 20253910 PMAQI
1st Aug 20253211 PMAQI
2nd Aug 20253612 AMAQI
2nd Aug 2025391 AMAQI
2nd Aug 2025402 AMAQI
2nd Aug 2025413 AMAQI

23°C14/33°C

2nd Aug 2025414 AMAQI
2nd Aug 2025425 AMAQI
2nd Aug 2025426 AMAQI
2nd Aug 2025417 AMAQI
2nd Aug 2025428 AMAQI
2nd Aug 2025489 AMAQI
2nd Aug 20254810 AMAQI
2nd Aug 20254711 AMAQI
2nd Aug 20253912 PMAQI
2nd Aug 2025471 PMAQI
2nd Aug 2025512 PMAQI
2nd Aug 2025543 PMAQI
2nd Aug 2025474 PMAQI
2nd Aug 2025545 PMAQI
2nd Aug 2025556 PMAQI
2nd Aug 2025527 PMAQI
2nd Aug 2025448 PMAQI
2nd Aug 2025419 PMAQI
2nd Aug 20254010 PMAQI
2nd Aug 20254311 PMAQI
3rd Aug 20253512 AMAQI
3rd Aug 2025381 AMAQI
3rd Aug 2025392 AMAQI
3rd Aug 2025393 AMAQI

25°C18/34°C

3rd Aug 2025424 AMAQI
3rd Aug 2025435 AMAQI
3rd Aug 2025406 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025438 AMAQI
3rd Aug 2025479 AMAQI
3rd Aug 20255010 AMAQI
3rd Aug 20255011 AMAQI
3rd Aug 20256312 PMAQI
3rd Aug 2025571 PMAQI
3rd Aug 2025592 PMAQI
3rd Aug 2025513 PMAQI
3rd Aug 2025594 PMAQI
3rd Aug 2025565 PMAQI
3rd Aug 2025586 PMAQI
3rd Aug 2025597 PMAQI
3rd Aug 2025568 PMAQI
3rd Aug 2025459 PMAQI
3rd Aug 20254610 PMAQI
3rd Aug 20254611 PMAQI
4th Aug 20254412 AMAQI
4th Aug 2025401 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025413 AMAQI

27°C20/35°C

4th Aug 2025464 AMAQI
4th Aug 2025465 AMAQI
4th Aug 2025476 AMAQI
4th Aug 2025457 AMAQI
4th Aug 2025488 AMAQI
4th Aug 2025509 AMAQI
4th Aug 20255810 AMAQI
4th Aug 20256611 AMAQI
4th Aug 20256812 PMAQI
4th Aug 2025671 PMAQI
4th Aug 2025722 PMAQI
4th Aug 2025723 PMAQI
4th Aug 2025794 PMAQI
4th Aug 2025725 PMAQI
4th Aug 2025696 PMAQI
4th Aug 2025627 PMAQI
4th Aug 2025648 PMAQI
4th Aug 2025589 PMAQI
4th Aug 20255510 PMAQI
4th Aug 20255511 PMAQI
5th Aug 20255712 AMAQI
5th Aug 2025491 AMAQI
5th Aug 2025452 AMAQI
5th Aug 2025433 AMAQI

25°C16/36°C

5th Aug 2025504 AMAQI
5th Aug 2025535 AMAQI
5th Aug 2025546 AMAQI
5th Aug 2025547 AMAQI
5th Aug 2025538 AMAQI
5th Aug 2025589 AMAQI
5th Aug 20256310 AMAQI
5th Aug 20255811 AMAQI
5th Aug 20256812 PMAQI
5th Aug 2025531 PMAQI
5th Aug 2025532 PMAQI
5th Aug 2025563 PMAQI
5th Aug 2025504 PMAQI
5th Aug 2025485 PMAQI
5th Aug 2025506 PMAQI
5th Aug 2025547 PMAQI
5th Aug 2025528 PMAQI
5th Aug 2025489 PMAQI
5th Aug 20254910 PMAQI
5th Aug 20254611 PMAQI
6th Aug 20254812 AMAQI
6th Aug 2025511 AMAQI
6th Aug 2025512 AMAQI
6th Aug 2025503 AMAQI

25°C16/35°C

6th Aug 2025534 AMAQI
6th Aug 2025535 AMAQI
6th Aug 2025546 AMAQI
6th Aug 2025537 AMAQI
6th Aug 2025538 AMAQI
6th Aug 2025399 AMAQI
6th Aug 20253310 AMAQI
6th Aug 20253611 AMAQI
6th Aug 20254712 PMAQI
6th Aug 2025421 PMAQI
6th Aug 2025432 PMAQI
6th Aug 2025443 PMAQI
6th Aug 2025414 PMAQI
6th Aug 2025515 PMAQI
6th Aug 2025426 PMAQI
6th Aug 2025497 PMAQI
6th Aug 2025518 PMAQI
6th Aug 2025489 PMAQI
6th Aug 20254810 PMAQI
6th Aug 20254911 PMAQI
7th Aug 20254912 AMAQI
7th Aug 2025511 AMAQI
7th Aug 2025512 AMAQI
7th Aug 2025523 AMAQI

24°C18/30°C

7th Aug 2025524 AMAQI
7th Aug 2025515 AMAQI
7th Aug 2025516 AMAQI
7th Aug 2025487 AMAQI
7th Aug 2025518 AMAQI
7th Aug 2025359 AMAQI
7th Aug 20253810 AMAQI
7th Aug 20254311 AMAQI
7th Aug 20253012 PMAQI
7th Aug 2025301 PMAQI
7th Aug 2025222 PMAQI
7th Aug 2025223 PMAQI
7th Aug 2025234 PMAQI
7th Aug 2025275 PMAQI
7th Aug 2025246 PMAQI
7th Aug 2025257 PMAQI
7th Aug 2025318 PMAQI
7th Aug 2025399 PMAQI
7th Aug 20253810 PMAQI
7th Aug 20253711 PMAQI
8th Aug 20253812 AMAQI
8th Aug 2025421 AMAQI
8th Aug 2025502 AMAQI
8th Aug 2025513 AMAQI

22°C18/29°C

8th Aug 2025504 AMAQI
8th Aug 2025485 AMAQI
8th Aug 2025476 AMAQI
8th Aug 2025487 AMAQI
8th Aug 2025488 AMAQI
8th Aug 2025349 AMAQI
8th Aug 20253210 AMAQI
8th Aug 20252811 AMAQI
8th Aug 20252512 PMAQI
8th Aug 2025281 PMAQI
8th Aug 2025262 PMAQI
8th Aug 2025243 PMAQI
8th Aug 2025254 PMAQI
8th Aug 2025305 PMAQI
8th Aug 2025266 PMAQI
8th Aug 2025287 PMAQI
8th Aug 2025348 PMAQI
8th Aug 2025389 PMAQI
8th Aug 20253710 PMAQI
8th Aug 20253711 PMAQI
9th Aug 20253712 AMAQI
9th Aug 2025411 AMAQI
9th Aug 2025482 AMAQI
9th Aug 2025483 AMAQI

20°C12/28°C

9th Aug 2025464 AMAQI
9th Aug 2025435 AMAQI
9th Aug 2025436 AMAQI
9th Aug 2025437 AMAQI
9th Aug 2025438 AMAQI
9th Aug 2025319 AMAQI
9th Aug 20253610 AMAQI
9th Aug 20253611 AMAQI
9th Aug 20254012 PMAQI
9th Aug 2025441 PMAQI
9th Aug 2025422 PMAQI
9th Aug 2025443 PMAQI
9th Aug 2025434 PMAQI
9th Aug 2025385 PMAQI
9th Aug 2025406 PMAQI
9th Aug 2025387 PMAQI
9th Aug 2025358 PMAQI
9th Aug 2025379 PMAQI
9th Aug 20253710 PMAQI
9th Aug 20253811 PMAQI
10th Aug 20253812 AMAQI
10th Aug 2025401 AMAQI
10th Aug 2025442 AMAQI
10th Aug 2025433 AMAQI

21°C13/31°C

10th Aug 2025444 AMAQI
10th Aug 2025425 AMAQI
10th Aug 2025436 AMAQI
10th Aug 2025437 AMAQI
10th Aug 2025438 AMAQI
10th Aug 2025389 AMAQI
10th Aug 20253610 AMAQI
10th Aug 20253511 AMAQI
10th Aug 20254212 PMAQI
10th Aug 2025431 PMAQI
10th Aug 2025392 PMAQI
10th Aug 2025403 PMAQI
10th Aug 2025384 PMAQI
10th Aug 2025285 PMAQI
10th Aug 2025266 PMAQI
10th Aug 2025247 PMAQI
10th Aug 2025288 PMAQI
10th Aug 2025339 PMAQI
10th Aug 20253010 PMAQI
10th Aug 20253311 PMAQI
11th Aug 20253212 AMAQI
11th Aug 2025351 AMAQI
11th Aug 2025422 AMAQI
11th Aug 2025433 AMAQI

18°C14/22°C

11th Aug 2025424 AMAQI
11th Aug 2025425 AMAQI
11th Aug 2025436 AMAQI
11th Aug 2025427 AMAQI
11th Aug 2025428 AMAQI
11th Aug 2025249 AMAQI
11th Aug 20251710 AMAQI
11th Aug 20252211 AMAQI
11th Aug 20252212 PMAQI
11th Aug 2025221 PMAQI
11th Aug 2025222 PMAQI
11th Aug 2025363 PMAQI
11th Aug 2025424 PMAQI
11th Aug 2025425 PMAQI
11th Aug 2025316 PMAQI
11th Aug 2025337 PMAQI
11th Aug 2025318 PMAQI
11th Aug 2025349 PMAQI
11th Aug 20253710 PMAQI
11th Aug 20253411 PMAQI
12th Aug 20253712 AMAQI
12th Aug 2025411 AMAQI
12th Aug 2025402 AMAQI
12th Aug 2025403 AMAQI

20°C15/26°C

12th Aug 2025354 AMAQI
12th Aug 2025365 AMAQI
12th Aug 2025376 AMAQI
12th Aug 2025377 AMAQI
12th Aug 2025368 AMAQI
12th Aug 2025299 AMAQI
12th Aug 20253210 AMAQI
12th Aug 20253611 AMAQI
12th Aug 20253012 PMAQI
12th Aug 2025271 PMAQI
12th Aug 2025282 PMAQI
12th Aug 2025283 PMAQI
12th Aug 2025364 PMAQI
12th Aug 2025345 PMAQI
12th Aug 2025356 PMAQI
12th Aug 2025357 PMAQI
12th Aug 2025348 PMAQI
12th Aug 2025389 PMAQI
12th Aug 20253310 PMAQI
12th Aug 20253211 PMAQI
13th Aug 20253712 AMAQI
13th Aug 2025421 AMAQI
13th Aug 2025382 AMAQI
13th Aug 2025373 AMAQI

18°C15/21°C

13th Aug 2025364 AMAQI
13th Aug 2025355 AMAQI
13th Aug 2025366 AMAQI
13th Aug 2025367 AMAQI
13th Aug 2025368 AMAQI
13th Aug 2025289 AMAQI
13th Aug 20252210 AMAQI
13th Aug 20253211 AMAQI
13th Aug 20253112 PMAQI
13th Aug 2025301 PMAQI
13th Aug 2025322 PMAQI
13th Aug 2025403 PMAQI
13th Aug 2025434 PMAQI
13th Aug 2025545 PMAQI
13th Aug 2025536 PMAQI
13th Aug 2025517 PMAQI
13th Aug 2025358 PMAQI
13th Aug 2025359 PMAQI
13th Aug 20253410 PMAQI
13th Aug 20253711 PMAQI
14th Aug 20253412 AMAQI
14th Aug 2025351 AMAQI
14th Aug 2025372 AMAQI
14th Aug 2025373 AMAQI

22°C17/29°C

14th Aug 2025364 AMAQI
14th Aug 2025355 AMAQI
14th Aug 2025366 AMAQI
14th Aug 2025367 AMAQI
14th Aug 2025368 AMAQI
14th Aug 2025499 AMAQI
14th Aug 20253710 AMAQI
14th Aug 20254311 AMAQI
14th Aug 20253912 PMAQI
14th Aug 2025491 PMAQI
14th Aug 2025462 PMAQI
14th Aug 2025503 PMAQI
14th Aug 2025484 PMAQI
14th Aug 2025525 PMAQI
14th Aug 2025556 PMAQI
14th Aug 2025587 PMAQI
14th Aug 2025518 PMAQI
14th Aug 2025489 PMAQI
14th Aug 20254210 PMAQI
14th Aug 20254411 PMAQI
15th Aug 20254212 AMAQI
15th Aug 2025441 AMAQI
15th Aug 2025402 AMAQI
15th Aug 2025383 AMAQI

22°C15/30°C

15th Aug 2025444 AMAQI
15th Aug 2025405 AMAQI
15th Aug 2025426 AMAQI
15th Aug 2025397 AMAQI
15th Aug 2025438 AMAQI
15th Aug 2025519 AMAQI
15th Aug 20255110 AMAQI
15th Aug 20255211 AMAQI
15th Aug 20256412 PMAQI
15th Aug 2025561 PMAQI
15th Aug 2025502 PMAQI
15th Aug 2025393 PMAQI
15th Aug 2025554 PMAQI
15th Aug 2025525 PMAQI
15th Aug 2025516 PMAQI
15th Aug 2025577 PMAQI
15th Aug 2025528 PMAQI
15th Aug 2025479 PMAQI
15th Aug 20255110 PMAQI
15th Aug 20255211 PMAQI
16th Aug 20254712 AMAQI
16th Aug 2025441 AMAQI
16th Aug 2025442 AMAQI
16th Aug 2025393 AMAQI

22°C16/30°C

16th Aug 2025444 AMAQI
16th Aug 2025465 AMAQI
16th Aug 2025456 AMAQI
16th Aug 2025447 AMAQI
16th Aug 2025438 AMAQI
16th Aug 2025449 AMAQI
16th Aug 20254710 AMAQI
16th Aug 20254411 AMAQI
16th Aug 20254812 PMAQI
16th Aug 2025561 PMAQI
16th Aug 2025522 PMAQI
16th Aug 2025573 PMAQI
16th Aug 2025534 PMAQI
16th Aug 2025475 PMAQI
16th Aug 2025486 PMAQI
16th Aug 2025457 PMAQI
16th Aug 2025518 PMAQI
16th Aug 2025499 PMAQI
16th Aug 20254410 PMAQI
16th Aug 20254311 PMAQI
17th Aug 20254312 AMAQI
17th Aug 2025461 AMAQI
17th Aug 2025422 AMAQI
17th Aug 2025423 AMAQI

23°C14/31°C

17th Aug 2025424 AMAQI
17th Aug 2025475 AMAQI
17th Aug 2025436 AMAQI
17th Aug 2025447 AMAQI
17th Aug 2025428 AMAQI
17th Aug 2025469 AMAQI
17th Aug 20253710 AMAQI
17th Aug 20254611 AMAQI
17th Aug 20254912 PMAQI
17th Aug 2025531 PMAQI
17th Aug 2025502 PMAQI
17th Aug 2025523 PMAQI
17th Aug 2025474 PMAQI
17th Aug 2025485 PMAQI
17th Aug 2025406 PMAQI
17th Aug 2025447 PMAQI
17th Aug 2025428 PMAQI
17th Aug 2025409 PMAQI
17th Aug 20254010 PMAQI
17th Aug 20254111 PMAQI
18th Aug 20254012 AMAQI
18th Aug 2025391 AMAQI
18th Aug 2025442 AMAQI
18th Aug 2025433 AMAQI

25°C20/31°C

18th Aug 2025444 AMAQI
18th Aug 2025425 AMAQI
18th Aug 2025466 AMAQI
18th Aug 2025437 AMAQI
18th Aug 2025428 AMAQI
18th Aug 2025369 AMAQI
18th Aug 20253610 AMAQI
18th Aug 20254611 AMAQI
18th Aug 20254812 PMAQI
18th Aug 2025521 PMAQI
18th Aug 2025482 PMAQI
18th Aug 2025533 PMAQI
18th Aug 2025534 PMAQI
18th Aug 2025585 PMAQI
18th Aug 2025556 PMAQI
18th Aug 2025567 PMAQI
18th Aug 2025508 PMAQI
18th Aug 2025459 PMAQI
18th Aug 20254410 PMAQI
18th Aug 20254311 PMAQI
19th Aug 20254212 AMAQI
19th Aug 2025441 AMAQI
19th Aug 2025422 AMAQI
19th Aug 2025423 AMAQI

22°C14/30°C

19th Aug 2025434 AMAQI
19th Aug 2025425 AMAQI
19th Aug 2025426 AMAQI
19th Aug 2025437 AMAQI
19th Aug 2025418 AMAQI
19th Aug 2025489 AMAQI
19th Aug 20254910 AMAQI
19th Aug 20254511 AMAQI
19th Aug 20255412 PMAQI
19th Aug 2025511 PMAQI
19th Aug 2025542 PMAQI
19th Aug 2025503 PMAQI
19th Aug 2025494 PMAQI
19th Aug 2025525 PMAQI
19th Aug 2025526 PMAQI
19th Aug 2025487 PMAQI
19th Aug 2025548 PMAQI
19th Aug 2025509 PMAQI
19th Aug 20255110 PMAQI
19th Aug 20254811 PMAQI
20th Aug 20254912 AMAQI
20th Aug 2025451 AMAQI
20th Aug 2025422 AMAQI
20th Aug 2025413 AMAQI

22°C14/32°C

20th Aug 2025454 AMAQI
20th Aug 2025435 AMAQI
20th Aug 2025446 AMAQI
20th Aug 2025447 AMAQI
20th Aug 2025448 AMAQI
20th Aug 2025509 AMAQI
20th Aug 20254810 AMAQI
20th Aug 20255111 AMAQI
20th Aug 20254812 PMAQI
20th Aug 2025541 PMAQI
20th Aug 2025572 PMAQI
20th Aug 2025563 PMAQI
20th Aug 2025564 PMAQI
20th Aug 2025495 PMAQI
20th Aug 2025526 PMAQI
20th Aug 2025547 PMAQI
20th Aug 2025568 PMAQI
20th Aug 2025559 PMAQI
20th Aug 20255110 PMAQI
20th Aug 20255411 PMAQI
21st Aug 20255112 AMAQI
21st Aug 2025481 AMAQI
21st Aug 2025432 AMAQI
21st Aug 2025433 AMAQI

23°C15/32°C

21st Aug 2025464 AMAQI
4 AM
21st Aug 2025475 AMAQI
21st Aug 2025466 AMAQI
21st Aug 2025477 AMAQI
21st Aug 2025468 AMAQI
21st Aug 2025529 AMAQI
21st Aug 20255310 AMAQI
21st Aug 20255311 AMAQI
11 AM
21st Aug 20255712 PMAQI
21st Aug 2025571 PMAQI
21st Aug 2025582 PMAQI
21st Aug 2025593 PMAQI
21st Aug 2025544 PMAQI
6 PM
11 PM
3 AM

--°C/°C

Day time
Avg. Highest Time
11 AM - 6 PM

48AQI

8 hours / Day
240 hours / Month
Avg. Lowest Time
4 AM - 10 AM

44AQI

7 hours / Day
210 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 6 PM (Avg. 48), while the lowest AQI was between 4 AM to 10 AM (Avg. 44).
Night time
Avg. Highest Time
7 PM - 11 PM

44AQI

5 hours / Day
150 hours / Month
Avg. Lowest Time
12 AM - 3 AM

43AQI

4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 11 PM (Avg. 44), while the lowest AQI was between 12 AM to 3 AM (Avg. 43).

2025 Days Vs Air Quality

Nagano, Nagano, Japan

2025

84%

194

16%

38

Total number of days with different AQI categories in last 233 days in 2025 (132 days remaining)

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

Under WHO’s Safe Air Quality Limits: 84%

Health Risk Level:

Low

In 2025, 84% of 233 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

Nagano, Nagano, 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
31AQI
2nd January 2025
30AQI
3rd January 2025
27AQI
4th January 2025
27AQI
5th January 2025
30AQI
6th January 2025
32AQI
7th January 2025
32AQI
8th January 2025
26AQI
9th January 2025
26AQI
10th January 2025
25AQI
11th January 2025
27AQI
12th January 2025
29AQI
13th January 2025
31AQI
14th January 2025
39AQI
15th January 2025
31AQI
16th January 2025
33AQI
17th January 2025
29AQI
18th January 2025
30AQI
19th January 2025
35AQI
20th January 2025
39AQI
21st January 2025
46AQI
22nd January 2025
44AQI
23rd January 2025
54AQI
24th January 2025
44AQI
25th January 2025
41AQI
26th January 2025
33AQI
27th January 2025
31AQI
28th January 2025
33AQI
29th January 2025
31AQI
30th January 2025
31AQI
31st January 2025
29AQI
1st February 2025
38AQI
2nd February 2025
33AQI
3rd February 2025
37AQI
4th February 2025
31AQI
5th February 2025
32AQI
6th February 2025
30AQI
7th February 2025
32AQI
8th February 2025
30AQI
9th February 2025
29AQI
10th February 2025
31AQI
11th February 2025
31AQI
12th February 2025
35AQI
13th February 2025
32AQI
14th February 2025
33AQI
15th February 2025
30AQI
16th February 2025
38AQI
17th February 2025
37AQI
18th February 2025
33AQI
19th February 2025
32AQI
20th February 2025
30AQI
21st February 2025
31AQI
22nd February 2025
33AQI
23rd February 2025
32AQI
24th February 2025
32AQI
25th February 2025
35AQI
26th February 2025
43AQI
27th February 2025
50AQI
28th February 2025
51AQI
1st March 2025
54AQI
2nd March 2025
52AQI
3rd March 2025
40AQI
4th March 2025
38AQI
5th March 2025
30AQI
6th March 2025
32AQI
7th March 2025
33AQI
8th March 2025
42AQI
9th March 2025
37AQI
10th March 2025
43AQI
11th March 2025
37AQI
12th March 2025
36AQI
13th March 2025
49AQI
14th March 2025
41AQI
15th March 2025
45AQI
16th March 2025
24AQI
17th March 2025
24AQI
18th March 2025
28AQI
19th March 2025
20AQI
20th March 2025
28AQI
21st March 2025
41AQI
22nd March 2025
50AQI
23rd March 2025
61AQI
24th March 2025
62AQI
25th March 2025
73AQI
26th March 2025
74AQI
27th March 2025
71AQI
28th March 2025
42AQI
29th March 2025
40AQI
30th March 2025
36AQI
31st March 2025
35AQI
1st April 2025
27AQI
2nd April 2025
24AQI
3rd April 2025
21AQI
4th April 2025
22AQI
5th April 2025
35AQI
6th April 2025
26AQI
7th April 2025
36AQI
8th April 2025
40AQI
9th April 2025
30AQI
10th April 2025
45AQI
11th April 2025
40AQI
12th April 2025
47AQI
13th April 2025
26AQI
14th April 2025
34AQI
15th April 2025
24AQI
16th April 2025
25AQI
17th April 2025
43AQI
18th April 2025
52AQI
19th April 2025
62AQI
20th April 2025
54AQI
21st April 2025
44AQI
22nd April 2025
52AQI
23rd April 2025
30AQI
24th April 2025
27AQI
25th April 2025
35AQI
26th April 2025
49AQI
27th April 2025
47AQI
28th April 2025
49AQI
29th April 2025
40AQI
30th April 2025
54AQI
1st May 2025
50AQI
2nd May 2025
33AQI
3rd May 2025
38AQI
4th May 2025
34AQI
5th May 2025
38AQI
6th May 2025
31AQI
7th May 2025
29AQI
8th May 2025
32AQI
9th May 2025
35AQI
10th May 2025
25AQI
11th May 2025
23AQI
12th May 2025
29AQI
13th May 2025
42AQI
14th May 2025
48AQI
15th May 2025
51AQI
16th May 2025
54AQI
17th May 2025
36AQI
18th May 2025
41AQI
19th May 2025
41AQI
20th May 2025
59AQI
21st May 2025
63AQI
22nd May 2025
52AQI
23rd May 2025
51AQI
24th May 2025
44AQI
25th May 2025
28AQI
26th May 2025
31AQI
27th May 2025
34AQI
28th May 2025
32AQI
29th May 2025
39AQI
30th May 2025
29AQI
31st May 2025
23AQI
1st June 2025
21AQI
2nd June 2025
36AQI
3rd June 2025
28AQI
4th June 2025
33AQI
5th June 2025
39AQI
6th June 2025
46AQI
7th June 2025
50AQI
8th June 2025
60AQI
9th June 2025
60AQI
10th June 2025
44AQI
11th June 2025
36AQI
12th June 2025
47AQI
13th June 2025
50AQI
14th June 2025
39AQI
15th June 2025
29AQI
16th June 2025
32AQI
17th June 2025
38AQI
18th June 2025
46AQI
19th June 2025
51AQI
20th June 2025
54AQI
21st June 2025
57AQI
22nd June 2025
65AQI
23rd June 2025
47AQI
24th June 2025
46AQI
25th June 2025
43AQI
26th June 2025
40AQI
27th June 2025
49AQI
28th June 2025
45AQI
29th June 2025
49AQI
30th June 2025
52AQI
1st July 2025
57AQI
2nd July 2025
48AQI
3rd July 2025
50AQI
4th July 2025
56AQI
5th July 2025
57AQI
6th July 2025
56AQI
7th July 2025
57AQI
8th July 2025
61AQI
9th July 2025
62AQI
10th July 2025
57AQI
11th July 2025
45AQI
12th July 2025
47AQI
13th July 2025
48AQI
14th July 2025
43AQI
15th July 2025
36AQI
16th July 2025
45AQI
17th July 2025
34AQI
18th July 2025
37AQI
19th July 2025
36AQI
20th July 2025
39AQI
21st July 2025
41AQI
22nd July 2025
44AQI
23rd July 2025
45AQI
24th July 2025
49AQI
25th July 2025
48AQI
26th July 2025
45AQI
27th July 2025
43AQI
28th July 2025
45AQI
29th July 2025
51AQI
30th July 2025
50AQI
31st July 2025
45AQI
1st August 2025
42AQI
2nd August 2025
45AQI
3rd August 2025
48AQI
4th August 2025
56AQI
5th August 2025
52AQI
6th August 2025
48AQI
7th August 2025
39AQI
8th August 2025
37AQI
9th August 2025
40AQI
10th August 2025
37AQI
11th August 2025
34AQI
12th August 2025
35AQI
13th August 2025
38AQI
14th August 2025
43AQI
15th August 2025
48AQI
16th August 2025
46AQI
17th August 2025
44AQI
18th August 2025
46AQI
19th August 2025
48AQI
20th August 2025
47AQI

33AQI

34AQI

43AQI

38AQI

39AQI

44AQI

48AQI

44AQI

No. of days

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

202540AQI

30
1
27
1
24
7
25
5
25
6
23
7
22
9
18
2
194
38

Highest AQI recorded in

July

48AQI

Lowest AQI recorded in

January

33AQI

202437AQI

30
1
29
25
6
20
10
29
2
20
10
27
4
28
3
26
4
31
28
2
31
324
42

Highest AQI recorded in

April

50AQI

Lowest AQI recorded in

December

29AQI

202337AQI

30
1
27
1
28
3
29
1
26
5
26
4
21
10
29
2
29
1
31
23
6
29
2
328
36

Highest AQI recorded in

July

45AQI

Lowest AQI recorded in

October

30AQI

202236AQI

29
2
21
25
6
14
4
24
7
21
9
22
2
3
28
1
28
3
28
2
31
274
36

Highest AQI recorded in

May

44AQI

Lowest AQI recorded in

December

26AQI

202133AQI

30
1
26
2
27
2
20
1
30
1
22
8
23
8
28
3
30
29
2
29
1
28
3
322
32

Highest AQI recorded in

June

43AQI

Lowest AQI recorded in

January

25AQI

202031AQI

13
20
1
18
24
6
30
1
18
13
19
28
3
24
6
31
225
30

Highest AQI recorded in

August

49AQI

Lowest AQI recorded in

July

23AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2025(Avg.)
40AQI
Least Polluted Year Recorded
2020(Avg.)
31AQI

Nagano's annual 2025 AQI (40) shows an average percentage change of 16.1% (worsened AQI) compared to previous years: 2020 (31), 2021 (33), 2022 (36), 2023 (37), 2024 (37).