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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Iida, 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+

October Air Quality Analysis

Iida, Nagano, Japan

2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
8th Oct 2025
59AQI
Lowest AQI recorded on
30th Oct 2024
17AQI

Same Day Analysis (2nd October):
On this day, AQI across the 3 years varied significantly: 2026 ranks 3rd highest AQI at 46 of Good air quality, showing improvement over 2025 and 2024 on the same day.

Day & Night AQI Trend: 1st Oct - 2nd Oct 2026

Iida, Nagano, Japan

AQI
Day
Night
.

5 AM1st Oct 2026

5 PM

4 AM2nd Oct 2026

Day time
Avg. Highest Time
3PM1st Oct

47AQI

Avg. Lowest Time
11AM1st Oct

25AQI

Night time
Avg. Highest Time
12AM2nd Oct

58AQI

Avg. Lowest Time
1AM2nd Oct

29AQI

In the last 24 hours,

Iida's AQI reached its highest point of 58 at 12 AM during the Night, while the lowest point, 25, was recorded at 11 AM during the Day between 1st Oct and 2nd Oct 2026.

Day & Night AQI Trend : Sep - Oct 2026

Iida, Nagano, Japan

SepOct
03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd
Day
Night
3rd Sep 2026365 AMAQI
3rd Sep 2026366 AMAQI
3rd Sep 2026447 AMAQI
3rd Sep 2026428 AMAQI
3rd Sep 2026279 AMAQI
3rd Sep 20264310 AMAQI
3rd Sep 20266011 AMAQI
3rd Sep 20265112 PMAQI
3rd Sep 2026251 PMAQI
3rd Sep 2026252 PMAQI
3rd Sep 2026233 PMAQI
3rd Sep 2026254 PMAQI
3rd Sep 2026275 PMAQI
3rd Sep 2026236 PMAQI
3rd Sep 2026187 PMAQI
3rd Sep 2026218 PMAQI
3rd Sep 2026219 PMAQI
3rd Sep 20262510 PMAQI
3rd Sep 20262711 PMAQI
4th Sep 20262512 AMAQI
4th Sep 2026251 AMAQI
4th Sep 2026322 AMAQI
4th Sep 2026403 AMAQI
4th Sep 2026234 AMAQI

18°C15/22°C

4th Sep 2026215 AMAQI
4th Sep 2026246 AMAQI
4th Sep 2026347 AMAQI
4th Sep 2026408 AMAQI
4th Sep 2026259 AMAQI
4th Sep 20263210 AMAQI
4th Sep 20262911 AMAQI
4th Sep 20263612 PMAQI
4th Sep 2026311 PMAQI
4th Sep 2026292 PMAQI
4th Sep 2026253 PMAQI
4th Sep 2026254 PMAQI
4th Sep 2026255 PMAQI
4th Sep 2026256 PMAQI
4th Sep 2026257 PMAQI
4th Sep 2026298 PMAQI
4th Sep 2026259 PMAQI
4th Sep 20262110 PMAQI
4th Sep 20262911 PMAQI
5th Sep 20262712 AMAQI
5th Sep 2026251 AMAQI
5th Sep 2026252 AMAQI
5th Sep 2026253 AMAQI
5th Sep 2026214 AMAQI

17°C15/19°C

5th Sep 2026345 AMAQI
5th Sep 2026306 AMAQI
5th Sep 2026407 AMAQI
5th Sep 2026348 AMAQI
5th Sep 2026509 AMAQI
5th Sep 20266710 AMAQI
5th Sep 20266611 AMAQI
5th Sep 20266212 PMAQI
5th Sep 2026521 PMAQI
5th Sep 2026462 PMAQI
5th Sep 2026273 PMAQI
5th Sep 2026294 PMAQI
5th Sep 2026295 PMAQI
5th Sep 2026296 PMAQI
5th Sep 2026297 PMAQI
5th Sep 2026258 PMAQI
5th Sep 2026239 PMAQI
5th Sep 20263110 PMAQI
5th Sep 20264011 PMAQI
6th Sep 20262612 AMAQI
6th Sep 2026301 AMAQI
6th Sep 2026362 AMAQI
6th Sep 2026473 AMAQI
6th Sep 2026444 AMAQI

16°C14/21°C

6th Sep 2026525 AMAQI
6th Sep 2026366 AMAQI
6th Sep 2026427 AMAQI
6th Sep 2026468 AMAQI
6th Sep 2026489 AMAQI
6th Sep 20265910 AMAQI
6th Sep 20266011 AMAQI
6th Sep 20265012 PMAQI
6th Sep 2026521 PMAQI
6th Sep 2026402 PMAQI
6th Sep 2026293 PMAQI
6th Sep 2026254 PMAQI
6th Sep 2026255 PMAQI
6th Sep 2026256 PMAQI
6th Sep 2026277 PMAQI
6th Sep 2026388 PMAQI
6th Sep 2026279 PMAQI
6th Sep 20264210 PMAQI
6th Sep 20266011 PMAQI
7th Sep 20264412 AMAQI
7th Sep 2026421 AMAQI
7th Sep 2026422 AMAQI
7th Sep 2026383 AMAQI
7th Sep 2026284 AMAQI

16°C14/19°C

7th Sep 2026365 AMAQI
7th Sep 2026256 AMAQI
7th Sep 2026297 AMAQI
7th Sep 2026308 AMAQI
7th Sep 2026329 AMAQI
7th Sep 20265010 AMAQI
7th Sep 20264211 AMAQI
7th Sep 20265812 PMAQI
7th Sep 2026491 PMAQI
7th Sep 2026272 PMAQI
7th Sep 2026243 PMAQI
7th Sep 2026234 PMAQI
7th Sep 2026235 PMAQI
7th Sep 2026276 PMAQI
7th Sep 2026237 PMAQI
7th Sep 2026318 PMAQI
7th Sep 2026259 PMAQI
7th Sep 20263410 PMAQI
7th Sep 20263411 PMAQI
8th Sep 20263112 AMAQI
8th Sep 2026441 AMAQI
8th Sep 2026482 AMAQI
8th Sep 2026503 AMAQI
8th Sep 2026484 AMAQI

16°C14/19°C

8th Sep 2026385 AMAQI
8th Sep 2026406 AMAQI
8th Sep 2026407 AMAQI
8th Sep 2026468 AMAQI
8th Sep 2026369 AMAQI
8th Sep 20265110 AMAQI
8th Sep 20266511 AMAQI
8th Sep 20266312 PMAQI
8th Sep 2026551 PMAQI
8th Sep 2026582 PMAQI
8th Sep 2026273 PMAQI
8th Sep 2026274 PMAQI
8th Sep 2026235 PMAQI
8th Sep 2026226 PMAQI
8th Sep 2026367 PMAQI
8th Sep 2026448 PMAQI
8th Sep 2026329 PMAQI
8th Sep 20263110 PMAQI
8th Sep 20264411 PMAQI
9th Sep 20263612 AMAQI
9th Sep 2026491 AMAQI
9th Sep 2026482 AMAQI
9th Sep 2026483 AMAQI
9th Sep 2026524 AMAQI

20°C18/22°C

9th Sep 2026495 AMAQI
9th Sep 2026406 AMAQI
9th Sep 2026407 AMAQI
9th Sep 2026338 AMAQI
9th Sep 2026569 AMAQI
9th Sep 20266210 AMAQI
9th Sep 20266211 AMAQI
9th Sep 20263412 PMAQI
9th Sep 2026211 PMAQI
9th Sep 2026252 PMAQI
9th Sep 2026313 PMAQI
9th Sep 2026274 PMAQI
9th Sep 2026205 PMAQI
9th Sep 2026206 PMAQI
9th Sep 2026297 PMAQI
9th Sep 2026258 PMAQI
9th Sep 2026259 PMAQI
9th Sep 20263410 PMAQI
9th Sep 20264911 PMAQI
10th Sep 20263612 AMAQI
10th Sep 2026461 AMAQI
10th Sep 2026442 AMAQI
10th Sep 2026503 AMAQI
10th Sep 2026464 AMAQI

18°C16/19°C

10th Sep 2026385 AMAQI
10th Sep 2026266 AMAQI
10th Sep 2026257 AMAQI
10th Sep 2026388 AMAQI
10th Sep 2026469 AMAQI
10th Sep 20264810 AMAQI
10th Sep 20265411 AMAQI
10th Sep 20265812 PMAQI
10th Sep 2026321 PMAQI
10th Sep 2026402 PMAQI
10th Sep 2026253 PMAQI
10th Sep 2026264 PMAQI
10th Sep 2026345 PMAQI
10th Sep 2026216 PMAQI
10th Sep 2026387 PMAQI
10th Sep 2026448 PMAQI
10th Sep 2026609 PMAQI
10th Sep 20266010 PMAQI
10th Sep 20264411 PMAQI
11th Sep 20262912 AMAQI
11th Sep 2026301 AMAQI
11th Sep 2026232 AMAQI
11th Sep 2026343 AMAQI
11th Sep 2026254 AMAQI

15°C14/17°C

11th Sep 2026275 AMAQI
11th Sep 2026276 AMAQI
11th Sep 2026337 AMAQI
11th Sep 2026488 AMAQI
11th Sep 2026509 AMAQI
11th Sep 20264610 AMAQI
11th Sep 20264211 AMAQI
11th Sep 20264612 PMAQI
11th Sep 2026501 PMAQI
11th Sep 2026552 PMAQI
11th Sep 2026573 PMAQI
11th Sep 2026534 PMAQI
11th Sep 2026525 PMAQI
11th Sep 2026506 PMAQI
11th Sep 2026447 PMAQI
11th Sep 2026508 PMAQI
11th Sep 2026609 PMAQI
11th Sep 20265710 PMAQI
11th Sep 20265311 PMAQI
12th Sep 20265312 AMAQI
12th Sep 2026581 AMAQI
12th Sep 2026652 AMAQI
12th Sep 2026583 AMAQI
12th Sep 2026424 AMAQI

16°C15/18°C

12th Sep 2026405 AMAQI
12th Sep 2026406 AMAQI
12th Sep 2026367 AMAQI
12th Sep 2026368 AMAQI
12th Sep 2026509 AMAQI
12th Sep 20265710 AMAQI
12th Sep 20265711 AMAQI
12th Sep 20264612 PMAQI
12th Sep 2026541 PMAQI
12th Sep 2026402 PMAQI
12th Sep 2026383 PMAQI
12th Sep 2026324 PMAQI
12th Sep 2026255 PMAQI
12th Sep 2026386 PMAQI
12th Sep 2026257 PMAQI
12th Sep 2026408 PMAQI
12th Sep 2026279 PMAQI
12th Sep 20264610 PMAQI
12th Sep 20264611 PMAQI
13th Sep 20262112 AMAQI
13th Sep 2026251 AMAQI
13th Sep 2026272 AMAQI
13th Sep 2026293 AMAQI
13th Sep 2026254 AMAQI

18°C17/21°C

13th Sep 2026236 AMAQI
13th Sep 2026347 AMAQI
13th Sep 2026388 AMAQI
13th Sep 2026409 AMAQI
13th Sep 20262810 AMAQI
13th Sep 20262511 AMAQI
13th Sep 20262512 PMAQI
13th Sep 2026401 PMAQI
13th Sep 2026232 PMAQI
13th Sep 2026253 PMAQI
13th Sep 2026344 PMAQI
13th Sep 2026345 PMAQI
13th Sep 2026386 PMAQI
13th Sep 2026407 PMAQI
13th Sep 2026458 PMAQI
13th Sep 2026429 PMAQI
13th Sep 20263410 PMAQI
13th Sep 20262811 PMAQI
14th Sep 20262512 AMAQI
14th Sep 2026301 AMAQI
14th Sep 2026232 AMAQI
14th Sep 2026343 AMAQI
14th Sep 2026254 AMAQI

19°C17/21°C

14th Sep 2026425 AMAQI
14th Sep 2026336 AMAQI
14th Sep 2026217 AMAQI
14th Sep 2026298 AMAQI
14th Sep 2026329 AMAQI
14th Sep 20265210 AMAQI
14th Sep 20264711 AMAQI
14th Sep 20265512 PMAQI
14th Sep 2026421 PMAQI
14th Sep 2026362 PMAQI
14th Sep 2026273 PMAQI
14th Sep 2026344 PMAQI
14th Sep 2026255 PMAQI
14th Sep 2026276 PMAQI
14th Sep 2026297 PMAQI
14th Sep 2026388 PMAQI
14th Sep 2026269 PMAQI
14th Sep 20263110 PMAQI
14th Sep 20262511 PMAQI
15th Sep 20262912 AMAQI
15th Sep 2026251 AMAQI
15th Sep 2026252 AMAQI
15th Sep 2026253 AMAQI
15th Sep 2026254 AMAQI

19°C16/24°C

15th Sep 2026255 AMAQI
15th Sep 2026216 AMAQI
15th Sep 2026257 AMAQI
15th Sep 2026238 AMAQI
15th Sep 2026239 AMAQI
15th Sep 20262310 AMAQI
15th Sep 20263811 AMAQI
15th Sep 20264012 PMAQI
15th Sep 2026361 PMAQI
15th Sep 2026292 PMAQI
15th Sep 2026293 PMAQI
15th Sep 2026254 PMAQI
15th Sep 2026275 PMAQI
15th Sep 2026326 PMAQI
15th Sep 2026367 PMAQI
15th Sep 2026408 PMAQI
15th Sep 2026449 PMAQI
15th Sep 20263210 PMAQI
15th Sep 20263411 PMAQI
16th Sep 20262312 AMAQI
16th Sep 2026321 AMAQI
16th Sep 2026252 AMAQI
16th Sep 2026403 AMAQI
16th Sep 2026364 AMAQI

17°C14/21°C

16th Sep 2026385 AMAQI
16th Sep 2026426 AMAQI
16th Sep 2026317 AMAQI
16th Sep 2026408 AMAQI
16th Sep 2026529 AMAQI
16th Sep 20265510 AMAQI
16th Sep 20265411 AMAQI
16th Sep 20266012 PMAQI
16th Sep 2026521 PMAQI
16th Sep 2026362 PMAQI
16th Sep 2026463 PMAQI
16th Sep 2026554 PMAQI
16th Sep 2026515 PMAQI
16th Sep 2026576 PMAQI
16th Sep 2026507 PMAQI
16th Sep 2026468 PMAQI
16th Sep 2026529 PMAQI
16th Sep 20264610 PMAQI
16th Sep 20265511 PMAQI
17th Sep 20264012 AMAQI
17th Sep 2026291 AMAQI
17th Sep 2026342 AMAQI
17th Sep 2026293 AMAQI
17th Sep 2026364 AMAQI

16°C15/18°C

17th Sep 2026385 AMAQI
17th Sep 2026206 AMAQI
17th Sep 2026317 AMAQI
17th Sep 2026298 AMAQI
17th Sep 2026329 AMAQI
17th Sep 20265210 AMAQI
17th Sep 20264811 AMAQI
17th Sep 20263812 PMAQI
17th Sep 2026441 PMAQI
17th Sep 2026322 PMAQI
17th Sep 2026293 PMAQI
17th Sep 2026444 PMAQI
17th Sep 2026385 PMAQI
17th Sep 2026276 PMAQI
17th Sep 2026277 PMAQI
17th Sep 2026388 PMAQI
17th Sep 2026469 PMAQI
17th Sep 20264610 PMAQI
17th Sep 20263411 PMAQI
18th Sep 20263412 AMAQI
18th Sep 2026271 AMAQI
18th Sep 2026402 AMAQI
18th Sep 2026333 AMAQI
18th Sep 2026364 AMAQI

17°C14/22°C

18th Sep 2026365 AMAQI
18th Sep 2026296 AMAQI
18th Sep 2026407 AMAQI
18th Sep 2026388 AMAQI
18th Sep 2026329 AMAQI
18th Sep 20265110 AMAQI
18th Sep 20263211 AMAQI
18th Sep 20262312 PMAQI
18th Sep 2026361 PMAQI
18th Sep 2026382 PMAQI
18th Sep 2026293 PMAQI
18th Sep 2026334 PMAQI
18th Sep 2026335 PMAQI
18th Sep 2026386 PMAQI
18th Sep 2026507 PMAQI
18th Sep 2026388 PMAQI
18th Sep 2026389 PMAQI
18th Sep 20264010 PMAQI
18th Sep 20266011 PMAQI
19th Sep 20266912 AMAQI
19th Sep 2026561 AMAQI
19th Sep 2026582 AMAQI
19th Sep 2026543 AMAQI
19th Sep 2026514 AMAQI

19°C14/23°C

19th Sep 2026515 AMAQI
19th Sep 2026526 AMAQI
19th Sep 2026547 AMAQI
19th Sep 2026518 AMAQI
19th Sep 2026529 AMAQI
19th Sep 20264210 AMAQI
19th Sep 20263611 AMAQI
19th Sep 20262912 PMAQI
19th Sep 2026271 PMAQI
19th Sep 2026312 PMAQI
19th Sep 2026293 PMAQI
19th Sep 2026484 PMAQI
19th Sep 2026485 PMAQI
19th Sep 2026336 PMAQI
19th Sep 2026487 PMAQI
19th Sep 2026578 PMAQI
19th Sep 2026519 PMAQI
19th Sep 20265010 PMAQI
19th Sep 20264811 PMAQI
20th Sep 20265212 AMAQI
20th Sep 2026461 AMAQI
20th Sep 2026502 AMAQI
20th Sep 2026493 AMAQI
20th Sep 2026514 AMAQI

20°C16/24°C

20th Sep 2026485 AMAQI
20th Sep 2026466 AMAQI
20th Sep 2026407 AMAQI
20th Sep 2026468 AMAQI
20th Sep 2026429 AMAQI
20th Sep 20264210 AMAQI
20th Sep 20263111 AMAQI
20th Sep 20262912 PMAQI
20th Sep 2026301 PMAQI
20th Sep 2026292 PMAQI
20th Sep 2026293 PMAQI
20th Sep 2026214 PMAQI
20th Sep 2026255 PMAQI
20th Sep 2026336 PMAQI
20th Sep 2026547 PMAQI
20th Sep 2026698 PMAQI
20th Sep 2026339 PMAQI
20th Sep 20262910 PMAQI
20th Sep 20262911 PMAQI
21st Sep 20262912 AMAQI
21st Sep 2026231 AMAQI
21st Sep 2026292 AMAQI
21st Sep 2026253 AMAQI
21st Sep 2026254 AMAQI

18°C17/20°C

21st Sep 2026255 AMAQI
21st Sep 2026256 AMAQI
21st Sep 2026257 AMAQI
21st Sep 2026238 AMAQI
21st Sep 2026239 AMAQI
21st Sep 20262510 AMAQI
21st Sep 20262511 AMAQI
21st Sep 20262312 PMAQI
21st Sep 2026251 PMAQI
21st Sep 2026172 PMAQI
21st Sep 2026213 PMAQI
21st Sep 2026214 PMAQI
21st Sep 2026215 PMAQI
21st Sep 2026176 PMAQI
21st Sep 2026197 PMAQI
21st Sep 2026198 PMAQI
21st Sep 2026179 PMAQI
21st Sep 20262110 PMAQI
21st Sep 20262111 PMAQI
22nd Sep 20261912 AMAQI
22nd Sep 2026191 AMAQI
22nd Sep 2026362 AMAQI
22nd Sep 2026483 AMAQI
22nd Sep 2026504 AMAQI

18°C17/20°C

22nd Sep 2026275 AMAQI
22nd Sep 2026256 AMAQI
22nd Sep 2026217 AMAQI
22nd Sep 2026338 AMAQI
22nd Sep 2026259 AMAQI
22nd Sep 20262110 AMAQI
22nd Sep 20262111 AMAQI
22nd Sep 20262112 PMAQI
22nd Sep 2026211 PMAQI
22nd Sep 2026252 PMAQI
22nd Sep 2026253 PMAQI
22nd Sep 2026214 PMAQI
22nd Sep 2026275 PMAQI
22nd Sep 2026336 PMAQI
22nd Sep 2026337 PMAQI
22nd Sep 2026388 PMAQI
22nd Sep 2026479 PMAQI
22nd Sep 20263110 PMAQI
22nd Sep 20263711 PMAQI
23rd Sep 20262912 AMAQI
23rd Sep 2026421 AMAQI
23rd Sep 2026482 AMAQI
23rd Sep 2026403 AMAQI
23rd Sep 2026494 AMAQI

20°C17/24°C

23rd Sep 2026555 AMAQI
23rd Sep 2026496 AMAQI
23rd Sep 2026467 AMAQI
23rd Sep 2026488 AMAQI
23rd Sep 2026569 AMAQI
23rd Sep 20265610 AMAQI
23rd Sep 20265211 AMAQI
23rd Sep 20265512 PMAQI
23rd Sep 2026461 PMAQI
23rd Sep 2026582 PMAQI
23rd Sep 2026623 PMAQI
23rd Sep 2026534 PMAQI
23rd Sep 2026385 PMAQI
23rd Sep 2026386 PMAQI
23rd Sep 2026427 PMAQI
23rd Sep 2026478 PMAQI
23rd Sep 2026569 PMAQI
23rd Sep 20265410 PMAQI
23rd Sep 20264711 PMAQI
24th Sep 20265812 AMAQI
24th Sep 2026581 AMAQI
24th Sep 2026512 AMAQI
24th Sep 2026523 AMAQI
24th Sep 2026454 AMAQI

18°C15/21°C

24th Sep 2026485 AMAQI
24th Sep 2026466 AMAQI
24th Sep 2026427 AMAQI
24th Sep 2026408 AMAQI
24th Sep 2026389 AMAQI
24th Sep 20264910 AMAQI
24th Sep 20265011 AMAQI
24th Sep 20265112 PMAQI
24th Sep 2026591 PMAQI
24th Sep 2026532 PMAQI
24th Sep 2026543 PMAQI
24th Sep 2026554 PMAQI
24th Sep 2026525 PMAQI
24th Sep 2026546 PMAQI
24th Sep 2026517 PMAQI
24th Sep 2026598 PMAQI
24th Sep 2026629 PMAQI
24th Sep 20264610 PMAQI
24th Sep 20265211 PMAQI
25th Sep 20263612 AMAQI
25th Sep 2026311 AMAQI
25th Sep 2026482 AMAQI
25th Sep 2026403 AMAQI
25th Sep 2026364 AMAQI

18°C14/23°C

25th Sep 2026405 AMAQI
25th Sep 2026426 AMAQI
25th Sep 2026477 AMAQI
25th Sep 2026528 AMAQI
25th Sep 2026569 AMAQI
25th Sep 20265510 AMAQI
25th Sep 20265211 AMAQI
25th Sep 20265512 PMAQI
25th Sep 2026521 PMAQI
25th Sep 2026512 PMAQI
25th Sep 2026383 PMAQI
25th Sep 2026384 PMAQI
25th Sep 2026425 PMAQI
25th Sep 2026476 PMAQI
25th Sep 2026447 PMAQI
25th Sep 2026538 PMAQI
25th Sep 2026509 PMAQI
25th Sep 20264610 PMAQI
25th Sep 20264211 PMAQI
26th Sep 20263812 AMAQI
26th Sep 2026461 AMAQI
26th Sep 2026402 AMAQI
26th Sep 2026253 AMAQI
26th Sep 2026274 AMAQI

17°C14/20°C

26th Sep 2026255 AMAQI
26th Sep 2026236 AMAQI
26th Sep 2026257 AMAQI
26th Sep 2026328 AMAQI
26th Sep 2026409 AMAQI
26th Sep 20264710 AMAQI
26th Sep 20264611 AMAQI
26th Sep 20263812 PMAQI
26th Sep 2026361 PMAQI
26th Sep 2026402 PMAQI
26th Sep 2026383 PMAQI
26th Sep 2026364 PMAQI
26th Sep 2026385 PMAQI
26th Sep 2026406 PMAQI
26th Sep 2026387 PMAQI
26th Sep 2026388 PMAQI
26th Sep 2026479 PMAQI
26th Sep 20264010 PMAQI
26th Sep 20263811 PMAQI
27th Sep 20263612 AMAQI
27th Sep 2026271 AMAQI
27th Sep 2026292 AMAQI
27th Sep 2026313 AMAQI
27th Sep 2026234 AMAQI

14°C11/17°C

27th Sep 2026255 AMAQI
27th Sep 2026276 AMAQI
27th Sep 2026367 AMAQI
27th Sep 2026298 AMAQI
27th Sep 2026329 AMAQI
27th Sep 20263210 AMAQI
27th Sep 20264211 AMAQI
27th Sep 20264812 PMAQI
27th Sep 2026401 PMAQI
27th Sep 2026422 PMAQI
27th Sep 2026343 PMAQI
27th Sep 2026304 PMAQI
27th Sep 2026385 PMAQI
27th Sep 2026316 PMAQI
27th Sep 2026327 PMAQI
27th Sep 2026318 PMAQI
27th Sep 2026239 PMAQI
27th Sep 20262910 PMAQI
27th Sep 20262311 PMAQI
28th Sep 20264012 AMAQI
28th Sep 2026301 AMAQI
28th Sep 2026342 AMAQI
28th Sep 2026343 AMAQI
28th Sep 2026364 AMAQI

16°C14/18°C

28th Sep 2026405 AMAQI
28th Sep 2026406 AMAQI
28th Sep 2026317 AMAQI
28th Sep 2026298 AMAQI
28th Sep 2026409 AMAQI
28th Sep 20265410 AMAQI
28th Sep 20265311 AMAQI
28th Sep 20266012 PMAQI
28th Sep 2026541 PMAQI
28th Sep 2026582 PMAQI
28th Sep 2026553 PMAQI
28th Sep 2026444 PMAQI
28th Sep 2026465 PMAQI
28th Sep 2026366 PMAQI
28th Sep 2026367 PMAQI
28th Sep 2026368 PMAQI
28th Sep 2026319 PMAQI
28th Sep 20263010 PMAQI
28th Sep 20265311 PMAQI
29th Sep 20264212 AMAQI
29th Sep 2026421 AMAQI
29th Sep 2026422 AMAQI
29th Sep 2026503 AMAQI
29th Sep 2026464 AMAQI

15°C14/17°C

29th Sep 2026385 AMAQI
29th Sep 2026466 AMAQI
29th Sep 2026527 AMAQI
29th Sep 2026508 AMAQI
29th Sep 2026499 AMAQI
29th Sep 20265210 AMAQI
29th Sep 20264811 AMAQI
29th Sep 20265312 PMAQI
29th Sep 2026401 PMAQI
29th Sep 2026502 PMAQI
29th Sep 2026443 PMAQI
29th Sep 2026384 PMAQI
29th Sep 2026405 PMAQI
29th Sep 2026426 PMAQI
29th Sep 2026507 PMAQI
29th Sep 2026428 PMAQI
29th Sep 2026629 PMAQI
29th Sep 20266610 PMAQI
29th Sep 20266011 PMAQI
30th Sep 20265312 AMAQI
30th Sep 2026421 AMAQI
30th Sep 2026482 AMAQI
30th Sep 2026483 AMAQI
30th Sep 2026444 AMAQI

12°C11/16°C

30th Sep 2026385 AMAQI
30th Sep 2026276 AMAQI
30th Sep 2026237 AMAQI
30th Sep 2026278 AMAQI
30th Sep 2026449 AMAQI
30th Sep 20263510 AMAQI
30th Sep 20261211 AMAQI
30th Sep 20261212 PMAQI
30th Sep 2026141 PMAQI
30th Sep 2026232 PMAQI
30th Sep 2026383 PMAQI
30th Sep 2026344 PMAQI
30th Sep 2026485 PMAQI
30th Sep 2026326 PMAQI
30th Sep 2026297 PMAQI
30th Sep 2026388 PMAQI
30th Sep 2026389 PMAQI
30th Sep 20264410 PMAQI
30th Sep 20263111 PMAQI
1st Oct 20262712 AMAQI
1st Oct 2026291 AMAQI
1st Oct 2026312 AMAQI
1st Oct 2026343 AMAQI
1st Oct 2026334 AMAQI

16°C13/19°C

1st Oct 2026275 AMAQI
1st Oct 2026256 AMAQI
1st Oct 2026277 AMAQI
1st Oct 2026388 AMAQI
1st Oct 2026349 AMAQI
1st Oct 20262510 AMAQI
1st Oct 20262511 AMAQI
1st Oct 20263612 PMAQI
1st Oct 2026461 PMAQI
1st Oct 2026382 PMAQI
1st Oct 2026473 PMAQI
1st Oct 2026464 PMAQI
1st Oct 2026425 PMAQI
1st Oct 2026476 PMAQI
1st Oct 2026367 PMAQI
1st Oct 2026368 PMAQI
1st Oct 2026369 PMAQI
1st Oct 20265310 PMAQI
1st Oct 20265711 PMAQI
2nd Oct 20265812 AMAQI
2nd Oct 2026291 AMAQI
2nd Oct 2026362 AMAQI
2nd Oct 2026403 AMAQI
2nd Oct 2026444 AMAQI

18°C15/23°C

2nd Oct 2026495 AMAQI
5 AM
2nd Oct 2026296 AMAQI
2nd Oct 2026347 AMAQI
2nd Oct 2026328 AMAQI
2nd Oct 2026349 AMAQI
2nd Oct 20264410 AMAQI
2nd Oct 20264411 AMAQI
11 AM
2nd Oct 20265212 PMAQI
2nd Oct 2026551 PMAQI
2nd Oct 2026422 PMAQI
2nd Oct 2026533 PMAQI
2nd Oct 2026534 PMAQI
2nd Oct 2026515 PMAQI
5 PM
2nd Oct 2026526 PMAQI
2nd Oct 2026577 PMAQI
2nd Oct 2026548 PMAQI
2nd Oct 2026579 PMAQI
2nd Oct 20265610 PMAQI
2nd Oct 20265411 PMAQI
11 PM
4 AM

16°C11/20°C

Day time
Avg. Highest Time
10 AM - 12 PM

44AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
6 AM

33AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 10 AM to 12 PM (Avg. 44), while the lowest AQI was between 6 AM to 6 AM (Avg. 33).
Night time
Avg. Highest Time
11 PM

42AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
6 PM

34AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 PM to 11 PM (Avg. 42), while the lowest AQI was between 6 PM to 6 PM (Avg. 34).

2026 Days Vs Air Quality

Iida, Nagano, Japan

2026

90%

247

10%

28

Total number of days with different AQI categories in last 275 days in 2026 (90 days remaining)

Good
247 Days
Moderate
28 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 90%

Health Risk Level:

Very Low

In 2026, 90% of 275 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.

Annual Air Quality Insights

Iida, Nagano, 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
22AQI (US)
2nd January 2026
20AQI (US)
3rd January 2026
17AQI (US)
4th January 2026
24AQI (US)
5th January 2026
36AQI (US)
6th January 2026
22AQI (US)
7th January 2026
26AQI (US)
8th January 2026
28AQI (US)
9th January 2026
21AQI (US)
10th January 2026
34AQI (US)
11th January 2026
29AQI (US)
12th January 2026
19AQI (US)
13th January 2026
23AQI (US)
14th January 2026
16AQI (US)
15th January 2026
34AQI (US)
16th January 2026
37AQI (US)
17th January 2026
47AQI (US)
18th January 2026
43AQI (US)
19th January 2026
52AQI (US)
20th January 2026
34AQI (US)
21st January 2026
16AQI (US)
22nd January 2026
21AQI (US)
23rd January 2026
32AQI (US)
24th January 2026
39AQI (US)
25th January 2026
42AQI (US)
26th January 2026
23AQI (US)
27th January 2026
34AQI (US)
28th January 2026
27AQI (US)
29th January 2026
20AQI (US)
30th January 2026
32AQI (US)
31st January 2026
32AQI (US)
1st February 2026
30AQI (US)
2nd February 2026
41AQI (US)
3rd February 2026
30AQI (US)
4th February 2026
32AQI (US)
5th February 2026
31AQI (US)
6th February 2026
37AQI (US)
7th February 2026
19AQI (US)
8th February 2026
21AQI (US)
9th February 2026
32AQI (US)
10th February 2026
34AQI (US)
11th February 2026
39AQI (US)
12th February 2026
36AQI (US)
13th February 2026
46AQI (US)
14th February 2026
51AQI (US)
15th February 2026
52AQI (US)
16th February 2026
43AQI (US)
17th February 2026
20AQI (US)
18th February 2026
20AQI (US)
19th February 2026
29AQI (US)
20th February 2026
30AQI (US)
21st February 2026
41AQI (US)
22nd February 2026
41AQI (US)
23rd February 2026
43AQI (US)
24th February 2026
50AQI (US)
25th February 2026
27AQI (US)
26th February 2026
19AQI (US)
27th February 2026
44AQI (US)
28th February 2026
44AQI (US)
1st March 2026
24AQI (US)
2nd March 2026
67AQI (US)
3rd March 2026
40AQI (US)
4th March 2026
11AQI (US)
5th March 2026
50AQI (US)
6th March 2026
53AQI (US)
7th March 2026
44AQI (US)
8th March 2026
42AQI (US)
9th March 2026
47AQI (US)
10th March 2026
58AQI (US)
11th March 2026
56AQI (US)
12th March 2026
63AQI (US)
13th March 2026
40AQI (US)
14th March 2026
46AQI (US)
15th March 2026
59AQI (US)
16th March 2026
56AQI (US)
17th March 2026
50AQI (US)
18th March 2026
54AQI (US)
19th March 2026
34AQI (US)
20th March 2026
35AQI (US)
21st March 2026
46AQI (US)
22nd March 2026
44AQI (US)
23rd March 2026
33AQI (US)
24th March 2026
47AQI (US)
25th March 2026
45AQI (US)
26th March 2026
10AQI (US)
27th March 2026
25AQI (US)
28th March 2026
60AQI (US)
29th March 2026
60AQI (US)
30th March 2026
46AQI (US)
31st March 2026
15AQI (US)
1st April 2026
20AQI (US)
2nd April 2026
38AQI (US)
3rd April 2026
46AQI (US)
4th April 2026
44AQI (US)
5th April 2026
33AQI (US)
6th April 2026
29AQI (US)
7th April 2026
31AQI (US)
8th April 2026
25AQI (US)
9th April 2026
29AQI (US)
10th April 2026
44AQI (US)
11th April 2026
35AQI (US)
12th April 2026
30AQI (US)
13th April 2026
31AQI (US)
14th April 2026
40AQI (US)
15th April 2026
36AQI (US)
16th April 2026
33AQI (US)
17th April 2026
36AQI (US)
18th April 2026
32AQI (US)
19th April 2026
31AQI (US)
20th April 2026
37AQI (US)
21st April 2026
39AQI (US)
22nd April 2026
45AQI (US)
23rd April 2026
36AQI (US)
24th April 2026
29AQI (US)
25th April 2026
46AQI (US)
26th April 2026
52AQI (US)
27th April 2026
49AQI (US)
28th April 2026
43AQI (US)
29th April 2026
40AQI (US)
30th April 2026
36AQI (US)
1st May 2026
46AQI (US)
2nd May 2026
51AQI (US)
3rd May 2026
43AQI (US)
4th May 2026
23AQI (US)
5th May 2026
23AQI (US)
6th May 2026
28AQI (US)
7th May 2026
29AQI (US)
8th May 2026
28AQI (US)
9th May 2026
26AQI (US)
10th May 2026
27AQI (US)
11th May 2026
29AQI (US)
12th May 2026
33AQI (US)
13th May 2026
39AQI (US)
14th May 2026
32AQI (US)
15th May 2026
39AQI (US)
16th May 2026
85AQI (US)
17th May 2026
68AQI (US)
18th May 2026
54AQI (US)
19th May 2026
49AQI (US)
20th May 2026
62AQI (US)
21st May 2026
60AQI (US)
22nd May 2026
61AQI (US)
23rd May 2026
55AQI (US)
24th May 2026
59AQI (US)
25th May 2026
49AQI (US)
26th May 2026
41AQI (US)
27th May 2026
25AQI (US)
28th May 2026
25AQI (US)
29th May 2026
24AQI (US)
30th May 2026
23AQI (US)
31st May 2026
25AQI (US)
1st June 2026
28AQI (US)
2nd June 2026
30AQI (US)
3rd June 2026
24AQI (US)
4th June 2026
23AQI (US)
5th June 2026
21AQI (US)
6th June 2026
22AQI (US)
7th June 2026
22AQI (US)
8th June 2026
20AQI (US)
9th June 2026
23AQI (US)
10th June 2026
21AQI (US)
11th June 2026
24AQI (US)
12th June 2026
25AQI (US)
13th June 2026
26AQI (US)
14th June 2026
24AQI (US)
15th June 2026
22AQI (US)
16th June 2026
25AQI (US)
17th June 2026
24AQI (US)
18th June 2026
25AQI (US)
19th June 2026
27AQI (US)
20th June 2026
23AQI (US)
21st June 2026
17AQI (US)
22nd June 2026
18AQI (US)
23rd June 2026
21AQI (US)
24th June 2026
22AQI (US)
25th June 2026
26AQI (US)
26th June 2026
28AQI (US)
27th June 2026
26AQI (US)
28th June 2026
26AQI (US)
29th June 2026
27AQI (US)
30th June 2026
51AQI (US)
1st July 2026
38AQI (US)
2nd July 2026
13AQI (US)
3rd July 2026
18AQI (US)
4th July 2026
28AQI (US)
5th July 2026
22AQI (US)
6th July 2026
12AQI (US)
7th July 2026
16AQI (US)
8th July 2026
25AQI (US)
9th July 2026
27AQI (US)
10th July 2026
33AQI (US)
11th July 2026
30AQI (US)
12th July 2026
27AQI (US)
13th July 2026
26AQI (US)
14th July 2026
28AQI (US)
15th July 2026
37AQI (US)
16th July 2026
54AQI (US)
17th July 2026
46AQI (US)
18th July 2026
39AQI (US)
19th July 2026
24AQI (US)
20th July 2026
38AQI (US)
21st July 2026
52AQI (US)
22nd July 2026
69AQI (US)
23rd July 2026
45AQI (US)
24th July 2026
37AQI (US)
25th July 2026
49AQI (US)
26th July 2026
43AQI (US)
27th July 2026
36AQI (US)
28th July 2026
36AQI (US)
29th July 2026
33AQI (US)
30th July 2026
37AQI (US)
31st July 2026
40AQI (US)
1st August 2026
35AQI (US)
2nd August 2026
41AQI (US)
3rd August 2026
32AQI (US)
4th August 2026
26AQI (US)
5th August 2026
32AQI (US)
6th August 2026
34AQI (US)
7th August 2026
38AQI (US)
8th August 2026
38AQI (US)
9th August 2026
31AQI (US)
10th August 2026
40AQI (US)
11th August 2026
34AQI (US)
12th August 2026
30AQI (US)
13th August 2026
30AQI (US)
14th August 2026
32AQI (US)
15th August 2026
34AQI (US)
16th August 2026
32AQI (US)
17th August 2026
28AQI (US)
18th August 2026
34AQI (US)
19th August 2026
35AQI (US)
20th August 2026
31AQI (US)
21st August 2026
41AQI (US)
22nd August 2026
39AQI (US)
23rd August 2026
41AQI (US)
24th August 2026
42AQI (US)
25th August 2026
49AQI (US)
26th August 2026
43AQI (US)
27th August 2026
40AQI (US)
28th August 2026
35AQI (US)
29th August 2026
33AQI (US)
30th August 2026
33AQI (US)
31st August 2026
37AQI (US)
1st September 2026
32AQI (US)
2nd September 2026
32AQI (US)
3rd September 2026
35AQI (US)
4th September 2026
28AQI (US)
5th September 2026
36AQI (US)
6th September 2026
40AQI (US)
7th September 2026
34AQI (US)
8th September 2026
42AQI (US)
9th September 2026
38AQI (US)
10th September 2026
41AQI (US)
11th September 2026
43AQI (US)
12th September 2026
44AQI (US)
13th September 2026
31AQI (US)
14th September 2026
33AQI (US)
15th September 2026
30AQI (US)
16th September 2026
45AQI (US)
17th September 2026
36AQI (US)
18th September 2026
37AQI (US)
19th September 2026
47AQI (US)
20th September 2026
40AQI (US)
21st September 2026
23AQI (US)
22nd September 2026
29AQI (US)
23rd September 2026
49AQI (US)
24th September 2026
51AQI (US)
25th September 2026
46AQI (US)
26th September 2026
37AQI (US)
27th September 2026
32AQI (US)
28th September 2026
42AQI (US)
29th September 2026
48AQI (US)
30th September 2026
34AQI (US)
1st October 2026
36AQI (US)
2nd October 2026
46AQI (US)
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

29AQI (US)

35AQI (US)

44AQI (US)

37AQI (US)

41AQI (US)

25AQI (US)

34AQI (US)

35AQI (US)

38AQI (US)

41AQI (US)

No. of days

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

202635AQI (US)

30
1
26
2
21
10
29
1
22
9
29
1
28
3
31
29
1
2
247
28

Highest AQI (US) recorded in

March

44AQI (US)

Lowest AQI (US) recorded in

June

25AQI (US)

202539AQI (US)

28
3
26
2
23
8
30
31
26
4
20
11
23
8
30
23
8
21
9
27
4
308
57

Highest AQI (US) recorded in

July

46AQI (US)

Lowest AQI (US) recorded in

April

25AQI (US)

202434AQI (US)

19
4
5
4
1
14
1
28
2
31
28
3
24
5
30
1
30
31
248
13

Highest AQI (US) recorded in

June

42AQI (US)

Lowest AQI (US) recorded in

January

16AQI (US)

202317AQI (US)

3
31
34

Highest AQI (US) recorded in

December

18AQI (US)

Lowest AQI (US) recorded in

November

16AQI (US)

202027AQI (US)

13
18
3
1
1
33
3

Highest AQI (US) recorded in

April

30AQI (US)

Lowest AQI (US) recorded in

May

8AQI (US)

Most & Least Polluted Years Over the Last 5 Years

Most Polluted Year Recorded
2025(Avg.)
39AQI (US)
Least Polluted Year Recorded
2023(Avg.)
17AQI (US)

Iida's annual 2026 AQI (US) (35) shows an average percentage change of 32.04% (worsened AQI (US)) compared to previous years: 2020 (27), 2023 (17), 2024 (34), 2025 (39).