Saku, 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
Saku, Nagano, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
5th Aug 2024
61AQILowest AQI recorded on
18th Aug 2021
12AQISame Day Analysis (3rd August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 46 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 4th Aug - 5th Aug 2025
Saku, Nagano, Japan
AQI
Day
Night
.
4 AM4th Aug 2025
7 PM
3 AM5th Aug 2025
Day time
Avg. Highest Time
4PM4th Aug
80AQI
Avg. Lowest Time
7AM4th Aug
44AQI
Night time
Avg. Highest Time
7PM4th Aug
64AQI
Avg. Lowest Time
3AM5th Aug
43AQI
In the last 24 hours,
Saku's AQI reached its highest point of 80 at 4 PM during the Day, while the lowest point, 43, was recorded at 3 AM during the Night between 4th Aug and 5th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Saku, Nagano, Japan
JulAug
06th - 07th07th - 08th08th - 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
Day
Night
6th Jul 2025544 AMAQI
6th Jul 2025555 AMAQI
6th Jul 2025556 AMAQI
6th Jul 2025557 AMAQI
6th Jul 2025538 AMAQI
6th Jul 2025589 AMAQI
6th Jul 20256110 AMAQI
6th Jul 20255911 AMAQI
6th Jul 20256012 PMAQI
6th Jul 2025561 PMAQI
6th Jul 2025542 PMAQI
6th Jul 2025523 PMAQI
6th Jul 2025524 PMAQI
6th Jul 2025535 PMAQI
6th Jul 2025556 PMAQI
6th Jul 2025597 PMAQI
6th Jul 2025598 PMAQI
6th Jul 2025579 PMAQI
6th Jul 20255710 PMAQI
6th Jul 20255711 PMAQI
7th Jul 20255812 AMAQI
7th Jul 2025561 AMAQI
7th Jul 2025552 AMAQI
7th Jul 2025553 AMAQI
24°C19/31°C
7th Jul 2025554 AMAQI
7th Jul 2025555 AMAQI
7th Jul 2025556 AMAQI
7th Jul 2025567 AMAQI
7th Jul 2025558 AMAQI
7th Jul 2025569 AMAQI
7th Jul 20255910 AMAQI
7th Jul 20256411 AMAQI
7th Jul 20256312 PMAQI
7th Jul 2025611 PMAQI
7th Jul 2025592 PMAQI
7th Jul 2025583 PMAQI
7th Jul 2025604 PMAQI
7th Jul 2025635 PMAQI
7th Jul 2025686 PMAQI
7th Jul 2025667 PMAQI
7th Jul 2025668 PMAQI
7th Jul 2025609 PMAQI
7th Jul 20255910 PMAQI
7th Jul 20256011 PMAQI
8th Jul 20256012 AMAQI
8th Jul 2025571 AMAQI
8th Jul 2025562 AMAQI
8th Jul 2025563 AMAQI
24°C20/30°C
8th Jul 2025564 AMAQI
8th Jul 2025575 AMAQI
8th Jul 2025576 AMAQI
8th Jul 2025577 AMAQI
8th Jul 2025578 AMAQI
8th Jul 2025679 AMAQI
8th Jul 20257910 AMAQI
8th Jul 20258211 AMAQI
8th Jul 20258412 PMAQI
8th Jul 2025751 PMAQI
8th Jul 2025742 PMAQI
8th Jul 2025763 PMAQI
8th Jul 2025784 PMAQI
8th Jul 2025775 PMAQI
8th Jul 2025756 PMAQI
8th Jul 2025717 PMAQI
8th Jul 2025708 PMAQI
8th Jul 2025639 PMAQI
8th Jul 20256110 PMAQI
8th Jul 20256211 PMAQI
9th Jul 20256212 AMAQI
9th Jul 2025611 AMAQI
9th Jul 2025592 AMAQI
9th Jul 2025593 AMAQI
24°C20/30°C
9th Jul 2025594 AMAQI
9th Jul 2025615 AMAQI
9th Jul 2025616 AMAQI
9th Jul 2025617 AMAQI
9th Jul 2025618 AMAQI
9th Jul 2025709 AMAQI
9th Jul 20257610 AMAQI
9th Jul 20257611 AMAQI
9th Jul 20257312 PMAQI
9th Jul 2025731 PMAQI
9th Jul 2025702 PMAQI
9th Jul 2025723 PMAQI
9th Jul 2025774 PMAQI
9th Jul 2025835 PMAQI
9th Jul 2025756 PMAQI
9th Jul 2025687 PMAQI
9th Jul 2025658 PMAQI
9th Jul 2025629 PMAQI
9th Jul 20256210 PMAQI
9th Jul 20256111 PMAQI
10th Jul 20256012 AMAQI
10th Jul 2025611 AMAQI
10th Jul 2025612 AMAQI
10th Jul 2025623 AMAQI
23°C19/29°C
10th Jul 2025624 AMAQI
10th Jul 2025635 AMAQI
10th Jul 2025646 AMAQI
10th Jul 2025647 AMAQI
10th Jul 2025648 AMAQI
10th Jul 2025609 AMAQI
10th Jul 20256210 AMAQI
10th Jul 20256511 AMAQI
10th Jul 20256812 PMAQI
10th Jul 2025651 PMAQI
10th Jul 2025652 PMAQI
10th Jul 2025663 PMAQI
10th Jul 2025674 PMAQI
10th Jul 2025645 PMAQI
10th Jul 2025566 PMAQI
10th Jul 2025527 PMAQI
10th Jul 2025538 PMAQI
10th Jul 2025579 PMAQI
10th Jul 20255610 PMAQI
10th Jul 20255711 PMAQI
11th Jul 20255612 AMAQI
11th Jul 2025601 AMAQI
11th Jul 2025612 AMAQI
11th Jul 2025613 AMAQI
23°C18/29°C
11th Jul 2025624 AMAQI
11th Jul 2025635 AMAQI
11th Jul 2025636 AMAQI
11th Jul 2025637 AMAQI
11th Jul 2025638 AMAQI
11th Jul 2025289 AMAQI
11th Jul 20251910 AMAQI
11th Jul 20251911 AMAQI
11th Jul 20252212 PMAQI
11th Jul 2025371 PMAQI
11th Jul 2025382 PMAQI
11th Jul 2025383 PMAQI
11th Jul 2025394 PMAQI
11th Jul 2025405 PMAQI
11th Jul 2025396 PMAQI
11th Jul 2025387 PMAQI
11th Jul 2025428 PMAQI
11th Jul 2025559 PMAQI
11th Jul 20255610 PMAQI
11th Jul 20255611 PMAQI
12th Jul 20255512 AMAQI
12th Jul 2025561 AMAQI
12th Jul 2025592 AMAQI
12th Jul 2025593 AMAQI
20°C18/23°C
12th Jul 2025594 AMAQI
12th Jul 2025565 AMAQI
12th Jul 2025576 AMAQI
12th Jul 2025577 AMAQI
12th Jul 2025568 AMAQI
12th Jul 2025289 AMAQI
12th Jul 20252010 AMAQI
12th Jul 20252511 AMAQI
12th Jul 20253212 PMAQI
12th Jul 2025471 PMAQI
12th Jul 2025432 PMAQI
12th Jul 2025403 PMAQI
12th Jul 2025414 PMAQI
12th Jul 2025435 PMAQI
12th Jul 2025406 PMAQI
12th Jul 2025427 PMAQI
12th Jul 2025448 PMAQI
12th Jul 2025559 PMAQI
12th Jul 20255410 PMAQI
12th Jul 20255411 PMAQI
13th Jul 20255412 AMAQI
13th Jul 2025561 AMAQI
13th Jul 2025562 AMAQI
13th Jul 2025563 AMAQI
21°C17/26°C
13th Jul 2025564 AMAQI
13th Jul 2025555 AMAQI
13th Jul 2025556 AMAQI
13th Jul 2025557 AMAQI
13th Jul 2025558 AMAQI
13th Jul 2025419 AMAQI
13th Jul 20253110 AMAQI
13th Jul 20253311 AMAQI
13th Jul 20253812 PMAQI
13th Jul 2025441 PMAQI
13th Jul 2025432 PMAQI
13th Jul 2025423 PMAQI
13th Jul 2025444 PMAQI
13th Jul 2025475 PMAQI
13th Jul 2025506 PMAQI
13th Jul 2025517 PMAQI
13th Jul 2025528 PMAQI
13th Jul 2025549 PMAQI
13th Jul 20255410 PMAQI
13th Jul 20255411 PMAQI
14th Jul 20255412 AMAQI
14th Jul 2025541 AMAQI
14th Jul 2025552 AMAQI
14th Jul 2025553 AMAQI
22°C17/29°C
14th Jul 2025554 AMAQI
14th Jul 2025545 AMAQI
14th Jul 2025546 AMAQI
14th Jul 2025547 AMAQI
14th Jul 2025548 AMAQI
14th Jul 2025379 AMAQI
14th Jul 20253010 AMAQI
14th Jul 20252311 AMAQI
14th Jul 20252012 PMAQI
14th Jul 2025321 PMAQI
14th Jul 2025352 PMAQI
14th Jul 2025363 PMAQI
14th Jul 2025344 PMAQI
14th Jul 2025355 PMAQI
14th Jul 2025346 PMAQI
14th Jul 2025327 PMAQI
14th Jul 2025358 PMAQI
14th Jul 2025519 PMAQI
14th Jul 20255010 PMAQI
14th Jul 20255111 PMAQI
15th Jul 20255212 AMAQI
15th Jul 2025521 AMAQI
15th Jul 2025532 AMAQI
15th Jul 2025543 AMAQI
21°C18/27°C
15th Jul 2025534 AMAQI
15th Jul 2025535 AMAQI
15th Jul 2025536 AMAQI
15th Jul 2025527 AMAQI
15th Jul 2025528 AMAQI
15th Jul 2025259 AMAQI
15th Jul 20251510 AMAQI
15th Jul 20251511 AMAQI
15th Jul 20251812 PMAQI
15th Jul 2025281 PMAQI
15th Jul 2025282 PMAQI
15th Jul 2025283 PMAQI
15th Jul 2025294 PMAQI
15th Jul 2025305 PMAQI
15th Jul 2025286 PMAQI
15th Jul 2025277 PMAQI
15th Jul 2025318 PMAQI
15th Jul 2025479 PMAQI
15th Jul 20254610 PMAQI
15th Jul 20254611 PMAQI
16th Jul 20254712 AMAQI
16th Jul 2025491 AMAQI
16th Jul 2025522 AMAQI
16th Jul 2025523 AMAQI
22°C20/24°C
16th Jul 2025524 AMAQI
16th Jul 2025485 AMAQI
16th Jul 2025506 AMAQI
16th Jul 2025507 AMAQI
16th Jul 2025508 AMAQI
16th Jul 2025359 AMAQI
16th Jul 20254010 AMAQI
16th Jul 20254111 AMAQI
16th Jul 20254212 PMAQI
16th Jul 2025431 PMAQI
16th Jul 2025462 PMAQI
16th Jul 2025443 PMAQI
16th Jul 2025434 PMAQI
16th Jul 2025425 PMAQI
16th Jul 2025456 PMAQI
16th Jul 2025427 PMAQI
16th Jul 2025358 PMAQI
16th Jul 2025449 PMAQI
16th Jul 20254210 PMAQI
16th Jul 20254211 PMAQI
17th Jul 20254312 AMAQI
17th Jul 2025441 AMAQI
17th Jul 2025482 AMAQI
17th Jul 2025493 AMAQI
22°C17/28°C
17th Jul 2025484 AMAQI
17th Jul 2025475 AMAQI
17th Jul 2025486 AMAQI
17th Jul 2025487 AMAQI
17th Jul 2025488 AMAQI
17th Jul 2025219 AMAQI
17th Jul 20251610 AMAQI
17th Jul 20251411 AMAQI
17th Jul 20251512 PMAQI
17th Jul 2025261 PMAQI
17th Jul 2025282 PMAQI
17th Jul 2025283 PMAQI
17th Jul 2025314 PMAQI
17th Jul 2025325 PMAQI
17th Jul 2025326 PMAQI
17th Jul 2025347 PMAQI
17th Jul 2025358 PMAQI
17th Jul 2025439 PMAQI
17th Jul 20254310 PMAQI
17th Jul 20254311 PMAQI
18th Jul 20254312 AMAQI
18th Jul 2025451 AMAQI
18th Jul 2025462 AMAQI
18th Jul 2025473 AMAQI
20°C19/24°C
18th Jul 2025464 AMAQI
18th Jul 2025435 AMAQI
18th Jul 2025436 AMAQI
18th Jul 2025427 AMAQI
18th Jul 2025428 AMAQI
18th Jul 2025269 AMAQI
18th Jul 20252510 AMAQI
18th Jul 20252611 AMAQI
18th Jul 20252812 PMAQI
18th Jul 2025351 PMAQI
18th Jul 2025372 PMAQI
18th Jul 2025383 PMAQI
18th Jul 2025394 PMAQI
18th Jul 2025425 PMAQI
18th Jul 2025426 PMAQI
18th Jul 2025417 PMAQI
18th Jul 2025408 PMAQI
18th Jul 2025429 PMAQI
18th Jul 20254210 PMAQI
18th Jul 20254311 PMAQI
19th Jul 20254312 AMAQI
19th Jul 2025441 AMAQI
19th Jul 2025442 AMAQI
19th Jul 2025443 AMAQI
22°C16/29°C
19th Jul 2025444 AMAQI
19th Jul 2025425 AMAQI
19th Jul 2025426 AMAQI
19th Jul 2025437 AMAQI
19th Jul 2025428 AMAQI
19th Jul 2025279 AMAQI
19th Jul 20252610 AMAQI
19th Jul 20253411 AMAQI
19th Jul 20253612 PMAQI
19th Jul 2025371 PMAQI
19th Jul 2025372 PMAQI
19th Jul 2025373 PMAQI
19th Jul 2025384 PMAQI
19th Jul 2025385 PMAQI
19th Jul 2025416 PMAQI
19th Jul 2025407 PMAQI
19th Jul 2025408 PMAQI
19th Jul 2025419 PMAQI
19th Jul 20254010 PMAQI
19th Jul 20254211 PMAQI
20th Jul 20254212 AMAQI
20th Jul 2025421 AMAQI
20th Jul 2025432 AMAQI
20th Jul 2025433 AMAQI
23°C18/30°C
20th Jul 2025434 AMAQI
20th Jul 2025435 AMAQI
20th Jul 2025436 AMAQI
20th Jul 2025427 AMAQI
20th Jul 2025438 AMAQI
20th Jul 2025389 AMAQI
20th Jul 20253710 AMAQI
20th Jul 20253511 AMAQI
20th Jul 20253312 PMAQI
20th Jul 2025341 PMAQI
20th Jul 2025362 PMAQI
20th Jul 2025343 PMAQI
20th Jul 2025334 PMAQI
20th Jul 2025385 PMAQI
20th Jul 2025456 PMAQI
20th Jul 2025437 PMAQI
20th Jul 2025428 PMAQI
20th Jul 2025419 PMAQI
20th Jul 20254110 PMAQI
20th Jul 20254211 PMAQI
21st Jul 20254112 AMAQI
21st Jul 2025411 AMAQI
21st Jul 2025422 AMAQI
21st Jul 2025423 AMAQI
24°C18/32°C
21st Jul 2025424 AMAQI
21st Jul 2025415 AMAQI
21st Jul 2025426 AMAQI
21st Jul 2025427 AMAQI
21st Jul 2025428 AMAQI
21st Jul 2025409 AMAQI
21st Jul 20254610 AMAQI
21st Jul 20254011 AMAQI
21st Jul 20253612 PMAQI
21st Jul 2025381 PMAQI
21st Jul 2025382 PMAQI
21st Jul 2025363 PMAQI
21st Jul 2025404 PMAQI
21st Jul 2025405 PMAQI
21st Jul 2025346 PMAQI
21st Jul 2025347 PMAQI
21st Jul 2025348 PMAQI
21st Jul 2025429 PMAQI
21st Jul 20254110 PMAQI
21st Jul 20254011 PMAQI
22nd Jul 20254012 AMAQI
22nd Jul 2025401 AMAQI
22nd Jul 2025412 AMAQI
22nd Jul 2025413 AMAQI
25°C19/32°C
22nd Jul 2025414 AMAQI
22nd Jul 2025415 AMAQI
22nd Jul 2025406 AMAQI
22nd Jul 2025407 AMAQI
22nd Jul 2025418 AMAQI
22nd Jul 2025389 AMAQI
22nd Jul 20254710 AMAQI
22nd Jul 20255211 AMAQI
22nd Jul 20255212 PMAQI
22nd Jul 2025501 PMAQI
22nd Jul 2025482 PMAQI
22nd Jul 2025473 PMAQI
22nd Jul 2025454 PMAQI
22nd Jul 2025445 PMAQI
22nd Jul 2025476 PMAQI
22nd Jul 2025487 PMAQI
22nd Jul 2025468 PMAQI
22nd Jul 2025439 PMAQI
22nd Jul 20254210 PMAQI
22nd Jul 20254211 PMAQI
23rd Jul 20254312 AMAQI
23rd Jul 2025401 AMAQI
23rd Jul 2025402 AMAQI
23rd Jul 2025403 AMAQI
24°C20/32°C
23rd Jul 2025404 AMAQI
23rd Jul 2025415 AMAQI
23rd Jul 2025416 AMAQI
23rd Jul 2025417 AMAQI
23rd Jul 2025418 AMAQI
23rd Jul 2025419 AMAQI
23rd Jul 20255010 AMAQI
23rd Jul 20255611 AMAQI
23rd Jul 20255512 PMAQI
23rd Jul 2025531 PMAQI
23rd Jul 2025512 PMAQI
23rd Jul 2025493 PMAQI
23rd Jul 2025434 PMAQI
23rd Jul 2025415 PMAQI
23rd Jul 2025436 PMAQI
23rd Jul 2025447 PMAQI
23rd Jul 2025398 PMAQI
23rd Jul 2025429 PMAQI
23rd Jul 20254310 PMAQI
23rd Jul 20254311 PMAQI
24th Jul 20254112 AMAQI
24th Jul 2025421 AMAQI
24th Jul 2025432 AMAQI
24th Jul 2025423 AMAQI
24°C19/31°C
24th Jul 2025434 AMAQI
24th Jul 2025445 AMAQI
24th Jul 2025446 AMAQI
24th Jul 2025447 AMAQI
24th Jul 2025448 AMAQI
24th Jul 2025459 AMAQI
24th Jul 20255310 AMAQI
24th Jul 20255411 AMAQI
24th Jul 20255612 PMAQI
24th Jul 2025531 PMAQI
24th Jul 2025542 PMAQI
24th Jul 2025523 PMAQI
24th Jul 2025454 PMAQI
24th Jul 2025445 PMAQI
24th Jul 2025466 PMAQI
24th Jul 2025477 PMAQI
24th Jul 2025468 PMAQI
24th Jul 2025449 PMAQI
24th Jul 20254410 PMAQI
24th Jul 20254411 PMAQI
25th Jul 20254412 AMAQI
25th Jul 2025421 AMAQI
25th Jul 2025432 AMAQI
25th Jul 2025433 AMAQI
24°C18/32°C
25th Jul 2025434 AMAQI
25th Jul 2025455 AMAQI
25th Jul 2025456 AMAQI
25th Jul 2025447 AMAQI
25th Jul 2025458 AMAQI
25th Jul 2025459 AMAQI
25th Jul 20255410 AMAQI
25th Jul 20255411 AMAQI
25th Jul 20255312 PMAQI
25th Jul 2025521 PMAQI
25th Jul 2025542 PMAQI
25th Jul 2025483 PMAQI
25th Jul 2025424 PMAQI
25th Jul 2025515 PMAQI
25th Jul 2025526 PMAQI
25th Jul 2025497 PMAQI
25th Jul 2025468 PMAQI
25th Jul 2025479 PMAQI
25th Jul 20254610 PMAQI
25th Jul 20254611 PMAQI
26th Jul 20254612 AMAQI
26th Jul 2025441 AMAQI
26th Jul 2025432 AMAQI
26th Jul 2025453 AMAQI
23°C18/31°C
26th Jul 2025464 AMAQI
26th Jul 2025455 AMAQI
26th Jul 2025456 AMAQI
26th Jul 2025457 AMAQI
26th Jul 2025468 AMAQI
26th Jul 2025459 AMAQI
26th Jul 20255410 AMAQI
26th Jul 20255611 AMAQI
26th Jul 20255512 PMAQI
26th Jul 2025541 PMAQI
26th Jul 2025532 PMAQI
26th Jul 2025493 PMAQI
26th Jul 2025384 PMAQI
26th Jul 2025385 PMAQI
26th Jul 2025406 PMAQI
26th Jul 2025407 PMAQI
26th Jul 2025428 PMAQI
26th Jul 2025439 PMAQI
26th Jul 20254310 PMAQI
26th Jul 20254411 PMAQI
27th Jul 20254412 AMAQI
27th Jul 2025431 AMAQI
27th Jul 2025452 AMAQI
27th Jul 2025453 AMAQI
24°C19/32°C
27th Jul 2025464 AMAQI
27th Jul 2025455 AMAQI
27th Jul 2025456 AMAQI
27th Jul 2025457 AMAQI
27th Jul 2025458 AMAQI
27th Jul 2025419 AMAQI
27th Jul 20255210 AMAQI
27th Jul 20255211 AMAQI
27th Jul 20254612 PMAQI
27th Jul 2025431 PMAQI
27th Jul 2025462 PMAQI
27th Jul 2025433 PMAQI
27th Jul 2025404 PMAQI
27th Jul 2025425 PMAQI
27th Jul 2025466 PMAQI
27th Jul 2025487 PMAQI
27th Jul 2025478 PMAQI
27th Jul 2025439 PMAQI
27th Jul 20254110 PMAQI
27th Jul 20254211 PMAQI
28th Jul 20254312 AMAQI
28th Jul 2025431 AMAQI
28th Jul 2025452 AMAQI
28th Jul 2025453 AMAQI
25°C18/32°C
28th Jul 2025454 AMAQI
28th Jul 2025455 AMAQI
28th Jul 2025456 AMAQI
28th Jul 2025457 AMAQI
28th Jul 2025448 AMAQI
28th Jul 2025459 AMAQI
28th Jul 20254810 AMAQI
28th Jul 20255011 AMAQI
28th Jul 20254612 PMAQI
28th Jul 2025461 PMAQI
28th Jul 2025452 PMAQI
28th Jul 2025423 PMAQI
28th Jul 2025404 PMAQI
28th Jul 2025485 PMAQI
28th Jul 2025506 PMAQI
28th Jul 2025537 PMAQI
28th Jul 2025528 PMAQI
28th Jul 2025459 PMAQI
28th Jul 20254410 PMAQI
28th Jul 20254611 PMAQI
29th Jul 20254512 AMAQI
29th Jul 2025431 AMAQI
29th Jul 2025442 AMAQI
29th Jul 2025433 AMAQI
25°C19/32°C
29th Jul 2025444 AMAQI
29th Jul 2025435 AMAQI
29th Jul 2025446 AMAQI
29th Jul 2025447 AMAQI
29th Jul 2025448 AMAQI
29th Jul 2025529 AMAQI
29th Jul 20255810 AMAQI
29th Jul 20255811 AMAQI
29th Jul 20255612 PMAQI
29th Jul 2025521 PMAQI
29th Jul 2025512 PMAQI
29th Jul 2025493 PMAQI
29th Jul 2025504 PMAQI
29th Jul 2025495 PMAQI
29th Jul 2025526 PMAQI
29th Jul 2025537 PMAQI
29th Jul 2025498 PMAQI
29th Jul 2025469 PMAQI
29th Jul 20254510 PMAQI
29th Jul 20254511 PMAQI
30th Jul 20254312 AMAQI
30th Jul 2025431 AMAQI
30th Jul 2025452 AMAQI
30th Jul 2025453 AMAQI
25°C19/32°C
30th Jul 2025454 AMAQI
30th Jul 2025475 AMAQI
30th Jul 2025476 AMAQI
30th Jul 2025467 AMAQI
30th Jul 2025478 AMAQI
30th Jul 2025499 AMAQI
30th Jul 20255410 AMAQI
30th Jul 20255611 AMAQI
30th Jul 20255012 PMAQI
30th Jul 2025481 PMAQI
30th Jul 2025492 PMAQI
30th Jul 2025503 PMAQI
30th Jul 2025504 PMAQI
30th Jul 2025515 PMAQI
30th Jul 2025496 PMAQI
30th Jul 2025457 PMAQI
30th Jul 2025448 PMAQI
30th Jul 2025449 PMAQI
30th Jul 20254510 PMAQI
30th Jul 20254611 PMAQI
31st Jul 20254412 AMAQI
31st Jul 2025441 AMAQI
31st Jul 2025452 AMAQI
31st Jul 2025453 AMAQI
24°C18/31°C
31st Jul 2025454 AMAQI
31st Jul 2025465 AMAQI
31st Jul 2025466 AMAQI
31st Jul 2025467 AMAQI
31st Jul 2025468 AMAQI
31st Jul 2025469 AMAQI
31st Jul 20254610 AMAQI
31st Jul 20254511 AMAQI
31st Jul 20254012 PMAQI
31st Jul 2025431 PMAQI
31st Jul 2025422 PMAQI
31st Jul 2025413 PMAQI
31st Jul 2025434 PMAQI
31st Jul 2025455 PMAQI
31st Jul 2025466 PMAQI
31st Jul 2025487 PMAQI
31st Jul 2025498 PMAQI
31st Jul 2025509 PMAQI
31st Jul 20254210 PMAQI
31st Jul 20254211 PMAQI
1st Aug 20253812 AMAQI
1st Aug 2025441 AMAQI
1st Aug 2025362 AMAQI
1st Aug 2025403 AMAQI
23°C18/30°C
1st Aug 2025384 AMAQI
1st Aug 2025375 AMAQI
1st Aug 2025366 AMAQI
1st Aug 2025377 AMAQI
1st Aug 2025398 AMAQI
1st Aug 2025319 AMAQI
1st Aug 20253610 AMAQI
1st Aug 20254611 AMAQI
1st Aug 20254812 PMAQI
1st Aug 2025551 PMAQI
1st Aug 2025412 PMAQI
1st Aug 2025333 PMAQI
1st Aug 2025444 PMAQI
1st Aug 2025445 PMAQI
1st Aug 2025496 PMAQI
1st Aug 2025427 PMAQI
1st Aug 2025368 PMAQI
1st Aug 2025389 PMAQI
1st Aug 20253710 PMAQI
1st Aug 20253511 PMAQI
2nd Aug 20253512 AMAQI
2nd Aug 2025371 AMAQI
2nd Aug 2025402 AMAQI
2nd Aug 2025423 AMAQI
22°C16/28°C
2nd Aug 2025424 AMAQI
2nd Aug 2025425 AMAQI
2nd Aug 2025426 AMAQI
2nd Aug 2025417 AMAQI
2nd Aug 2025428 AMAQI
2nd Aug 2025479 AMAQI
2nd Aug 20254010 AMAQI
2nd Aug 20254511 AMAQI
2nd Aug 20253812 PMAQI
2nd Aug 2025471 PMAQI
2nd Aug 2025522 PMAQI
2nd Aug 2025513 PMAQI
2nd Aug 2025504 PMAQI
2nd Aug 2025495 PMAQI
2nd Aug 2025506 PMAQI
2nd Aug 2025507 PMAQI
2nd Aug 2025468 PMAQI
2nd Aug 2025439 PMAQI
2nd Aug 20254110 PMAQI
2nd Aug 20254111 PMAQI
3rd Aug 20253412 AMAQI
3rd Aug 2025371 AMAQI
3rd Aug 2025412 AMAQI
3rd Aug 2025403 AMAQI
24°C19/32°C
3rd Aug 2025424 AMAQI
3rd Aug 2025425 AMAQI
3rd Aug 2025406 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025408 AMAQI
3rd Aug 2025419 AMAQI
3rd Aug 20254710 AMAQI
3rd Aug 20254711 AMAQI
3rd Aug 20255412 PMAQI
3rd Aug 2025531 PMAQI
3rd Aug 2025512 PMAQI
3rd Aug 2025483 PMAQI
3rd Aug 2025564 PMAQI
3rd Aug 2025585 PMAQI
3rd Aug 2025566 PMAQI
3rd Aug 2025587 PMAQI
3rd Aug 2025568 PMAQI
3rd Aug 2025469 PMAQI
3rd Aug 20254710 PMAQI
3rd Aug 20254511 PMAQI
4th Aug 20254112 AMAQI
4th Aug 2025401 AMAQI
4th Aug 2025392 AMAQI
4th Aug 2025403 AMAQI
25°C19/32°C
4th Aug 2025454 AMAQI
4th Aug 2025455 AMAQI
4th Aug 2025456 AMAQI
4th Aug 2025447 AMAQI
4th Aug 2025478 AMAQI
4th Aug 2025539 AMAQI
4th Aug 20256010 AMAQI
4th Aug 20256011 AMAQI
4th Aug 20256712 PMAQI
4th Aug 2025691 PMAQI
4th Aug 2025742 PMAQI
4th Aug 2025683 PMAQI
4th Aug 2025804 PMAQI
4th Aug 2025715 PMAQI
4th Aug 2025706 PMAQI
4th Aug 2025647 PMAQI
4th Aug 2025608 PMAQI
4th Aug 2025589 PMAQI
4th Aug 20255510 PMAQI
4th Aug 20255711 PMAQI
5th Aug 20255712 AMAQI
5th Aug 2025481 AMAQI
5th Aug 2025462 AMAQI
5th Aug 2025433 AMAQI
26°C20/34°C
5th Aug 2025534 AMAQI
4 AM5th Aug 2025525 AMAQI
5th Aug 2025536 AMAQI
5th Aug 2025537 AMAQI
5th Aug 2025538 AMAQI
5th Aug 2025539 AMAQI
5th Aug 20255710 AMAQI
5th Aug 20255511 AMAQI
11 AM5th Aug 20255812 PMAQI
5th Aug 2025551 PMAQI
5th Aug 2025572 PMAQI
7 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 - 7 PM
47AQI
11 hours / Day
330 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 7 PM (Avg. 47).
Night time
Avg. Highest Time
12 AM - 11 PM
48AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
12 AM - 11 PM
48AQI
8 hours / Day
240 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 11 PM (Avg. 48).
2025 Days Vs Air Quality
Saku, Nagano, Japan
2025
87%
187
13%
28
Total number of days with different AQI categories in last 217 days in 2025 (148 days remaining)
Good
187 DaysModerate
28 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 217 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
Saku, 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
29AQI
29AQI
2nd January 2025
31AQI
31AQI
3rd January 2025
27AQI
27AQI
4th January 2025
27AQI
27AQI
5th January 2025
27AQI
27AQI
6th January 2025
35AQI
35AQI
7th January 2025
28AQI
28AQI
8th January 2025
31AQI
31AQI
9th January 2025
27AQI
27AQI
10th January 2025
25AQI
25AQI
11th January 2025
25AQI
25AQI
12th January 2025
30AQI
30AQI
13th January 2025
28AQI
28AQI
14th January 2025
30AQI
30AQI
15th January 2025
31AQI
31AQI
16th January 2025
28AQI
28AQI
17th January 2025
30AQI
30AQI
18th January 2025
27AQI
27AQI
19th January 2025
32AQI
32AQI
20th January 2025
30AQI
30AQI
21st January 2025
39AQI
39AQI
22nd January 2025
37AQI
37AQI
23rd January 2025
46AQI
46AQI
24th January 2025
50AQI
50AQI
25th January 2025
40AQI
40AQI
26th January 2025
37AQI
37AQI
27th January 2025
32AQI
32AQI
28th January 2025
39AQI
39AQI
29th January 2025
37AQI
37AQI
30th January 2025
38AQI
38AQI
31st January 2025
33AQI
33AQI
1st February 2025
42AQI
42AQI
2nd February 2025
48AQI
48AQI
3rd February 2025
44AQI
44AQI
4th February 2025
39AQI
39AQI
5th February 2025
36AQI
36AQI
6th February 2025
32AQI
32AQI
7th February 2025
34AQI
34AQI
8th February 2025
31AQI
31AQI
9th February 2025
30AQI
30AQI
10th February 2025
31AQI
31AQI
11th February 2025
32AQI
32AQI
12th February 2025
32AQI
32AQI
13th February 2025
32AQI
32AQI
14th February 2025
38AQI
38AQI
15th February 2025
31AQI
31AQI
16th February 2025
41AQI
41AQI
17th February 2025
40AQI
40AQI
18th February 2025
37AQI
37AQI
19th February 2025
32AQI
32AQI
20th February 2025
29AQI
29AQI
21st February 2025
30AQI
30AQI
22nd February 2025
31AQI
31AQI
23rd February 2025
30AQI
30AQI
24th February 2025
31AQI
31AQI
25th February 2025
34AQI
34AQI
26th February 2025
36AQI
36AQI
27th February 2025
43AQI
43AQI
28th February 2025
45AQI
45AQI
1st March 2025
49AQI
49AQI
2nd March 2025
48AQI
48AQI
3rd March 2025
37AQI
37AQI
4th March 2025
39AQI
39AQI
5th March 2025
33AQI
33AQI
6th March 2025
33AQI
33AQI
7th March 2025
35AQI
35AQI
8th March 2025
39AQI
39AQI
9th March 2025
38AQI
38AQI
10th March 2025
39AQI
39AQI
11th March 2025
45AQI
45AQI
12th March 2025
37AQI
37AQI
13th March 2025
46AQI
46AQI
14th March 2025
40AQI
40AQI
15th March 2025
40AQI
40AQI
16th March 2025
24AQI
24AQI
17th March 2025
23AQI
23AQI
18th March 2025
24AQI
24AQI
19th March 2025
21AQI
21AQI
20th March 2025
27AQI
27AQI
21st March 2025
40AQI
40AQI
22nd March 2025
47AQI
47AQI
23rd March 2025
58AQI
58AQI
24th March 2025
59AQI
59AQI
25th March 2025
76AQI
76AQI
26th March 2025
82AQI
82AQI
27th March 2025
71AQI
71AQI
28th March 2025
46AQI
46AQI
29th March 2025
37AQI
37AQI
30th March 2025
37AQI
37AQI
31st March 2025
32AQI
32AQI
1st April 2025
27AQI
27AQI
2nd April 2025
25AQI
25AQI
3rd April 2025
21AQI
21AQI
4th April 2025
24AQI
24AQI
5th April 2025
35AQI
35AQI
6th April 2025
28AQI
28AQI
7th April 2025
34AQI
34AQI
8th April 2025
42AQI
42AQI
9th April 2025
27AQI
27AQI
10th April 2025
47AQI
47AQI
11th April 2025
39AQI
39AQI
12th April 2025
48AQI
48AQI
13th April 2025
24AQI
24AQI
14th April 2025
31AQI
31AQI
15th April 2025
21AQI
21AQI
16th April 2025
27AQI
27AQI
17th April 2025
44AQI
44AQI
18th April 2025
53AQI
53AQI
19th April 2025
68AQI
68AQI
20th April 2025
54AQI
54AQI
21st April 2025
42AQI
42AQI
22nd April 2025
52AQI
52AQI
23rd April 2025
30AQI
30AQI
24th April 2025
35AQI
35AQI
25th April 2025
37AQI
37AQI
26th April 2025
47AQI
47AQI
27th April 2025
46AQI
46AQI
28th April 2025
47AQI
47AQI
29th April 2025
37AQI
37AQI
30th April 2025
52AQI
52AQI
1st May 2025
48AQI
48AQI
2nd May 2025
32AQI
32AQI
3rd May 2025
37AQI
37AQI
4th May 2025
34AQI
34AQI
5th May 2025
40AQI
40AQI
6th May 2025
28AQI
28AQI
7th May 2025
31AQI
31AQI
8th May 2025
35AQI
35AQI
9th May 2025
37AQI
37AQI
10th May 2025
26AQI
26AQI
11th May 2025
26AQI
26AQI
12th May 2025
25AQI
25AQI
13th May 2025
37AQI
37AQI
14th May 2025
44AQI
44AQI
15th May 2025
48AQI
48AQI
16th May 2025
50AQI
50AQI
17th May 2025
34AQI
34AQI
18th May 2025
45AQI
45AQI
19th May 2025
39AQI
39AQI
20th May 2025
59AQI
59AQI
21st May 2025
64AQI
64AQI
22nd May 2025
59AQI
59AQI
23rd May 2025
54AQI
54AQI
24th May 2025
45AQI
45AQI
25th May 2025
29AQI
29AQI
26th May 2025
31AQI
31AQI
27th May 2025
33AQI
33AQI
28th May 2025
30AQI
30AQI
29th May 2025
38AQI
38AQI
30th May 2025
26AQI
26AQI
31st May 2025
22AQI
22AQI
1st June 2025
22AQI
22AQI
2nd June 2025
35AQI
35AQI
3rd June 2025
25AQI
25AQI
4th June 2025
30AQI
30AQI
5th June 2025
36AQI
36AQI
6th June 2025
45AQI
45AQI
7th June 2025
50AQI
50AQI
8th June 2025
57AQI
57AQI
9th June 2025
56AQI
56AQI
10th June 2025
35AQI
35AQI
11th June 2025
30AQI
30AQI
12th June 2025
37AQI
37AQI
13th June 2025
45AQI
45AQI
14th June 2025
36AQI
36AQI
15th June 2025
30AQI
30AQI
16th June 2025
30AQI
30AQI
17th June 2025
37AQI
37AQI
18th June 2025
42AQI
42AQI
19th June 2025
46AQI
46AQI
20th June 2025
49AQI
49AQI
21st June 2025
52AQI
52AQI
22nd June 2025
55AQI
55AQI
23rd June 2025
47AQI
47AQI
24th June 2025
45AQI
45AQI
25th June 2025
44AQI
44AQI
26th June 2025
42AQI
42AQI
27th June 2025
45AQI
45AQI
28th June 2025
45AQI
45AQI
29th June 2025
49AQI
49AQI
30th June 2025
52AQI
52AQI
1st July 2025
54AQI
54AQI
2nd July 2025
50AQI
50AQI
3rd July 2025
51AQI
51AQI
4th July 2025
53AQI
53AQI
5th July 2025
55AQI
55AQI
6th July 2025
56AQI
56AQI
7th July 2025
59AQI
59AQI
8th July 2025
65AQI
65AQI
9th July 2025
66AQI
66AQI
10th July 2025
61AQI
61AQI
11th July 2025
49AQI
49AQI
12th July 2025
49AQI
49AQI
13th July 2025
50AQI
50AQI
14th July 2025
45AQI
45AQI
15th July 2025
41AQI
41AQI
16th July 2025
45AQI
45AQI
17th July 2025
38AQI
38AQI
18th July 2025
40AQI
40AQI
19th July 2025
40AQI
40AQI
20th July 2025
41AQI
41AQI
21st July 2025
40AQI
40AQI
22nd July 2025
43AQI
43AQI
23rd July 2025
44AQI
44AQI
24th July 2025
46AQI
46AQI
25th July 2025
47AQI
47AQI
26th July 2025
45AQI
45AQI
27th July 2025
45AQI
45AQI
28th July 2025
46AQI
46AQI
29th July 2025
48AQI
48AQI
30th July 2025
47AQI
47AQI
31st July 2025
45AQI
45AQI
1st August 2025
39AQI
39AQI
2nd August 2025
43AQI
43AQI
3rd August 2025
46AQI
46AQI
32AQI
35AQI
42AQI
38AQI
38AQI
42AQI
49AQI
43AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202540AQI
31
28
26
5
25
5
27
4
25
5
22
9
3
187
28
Highest AQI recorded in
July49AQI
Lowest AQI recorded in
January32AQI
202432AQI
31
29
29
1
30
29
2
23
7
29
2
27
4
27
3
31
30
31
346
19
Highest AQI recorded in
June43AQI
Lowest AQI recorded in
January24AQI
202331AQI
31
28
28
3
27
3
26
5
27
3
21
10
31
30
31
29
31
340
24
Highest AQI recorded in
July43AQI
Lowest AQI recorded in
September22AQI
202234AQI
30
21
28
3
23
6
26
5
24
6
17
4
1
28
29
2
29
1
31
287
27
Highest AQI recorded in
April43AQI
Lowest AQI recorded in
August16AQI
202130AQI
31
27
1
28
1
21
30
1
26
4
26
5
30
1
30
31
28
2
31
339
15
Highest AQI recorded in
June41AQI
Lowest AQI recorded in
January20AQI
202028AQI
13
19
2
18
25
5
30
1
21
10
19
28
3
24
6
31
228
27
Highest AQI recorded in
August46AQI
Lowest AQI recorded in
July17AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2025(Avg.)
40AQILeast Polluted Year Recorded
2020(Avg.)
28AQISaku's annual 2025 AQI (40) shows an average percentage change of 28.1% (worsened AQI) compared to previous years: 2020 (28), 2021 (30), 2022 (34), 2023 (31), 2024 (32).
