Country Background

Itoigawa, Niigata, 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

Itoigawa, Niigata, Japan

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
6th Oct 2025
58AQI
Lowest AQI recorded on
7th Oct 2022
17AQI


Same Day Analysis (12th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 55 of Moderate air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 12th Oct - 13th Oct 2025

Itoigawa, Niigata, Japan

AQI
Day
Night
.

5 AM12th Oct 2025

5 PM

4 AM13th Oct 2025

Day time
Avg. Highest Time
5PM12th Oct

74AQI

Avg. Lowest Time
7AM12th Oct

36AQI

Night time
Avg. Highest Time
7PM12th Oct

74AQI

Avg. Lowest Time
4AM13th Oct

46AQI

In the last 24 hours,

Itoigawa's AQI reached its highest point of 74 at 5 PM during the Day, while the lowest point, 36, was recorded at 7 AM during the Day between 12th Oct and 13th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Itoigawa, Niigata, Japan

SepOct
13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th
Day
Night
13th Sep 2025345 AMAQI
13th Sep 2025336 AMAQI
13th Sep 2025357 AMAQI
13th Sep 2025338 AMAQI
13th Sep 2025189 AMAQI
13th Sep 20251910 AMAQI
13th Sep 20253011 AMAQI
13th Sep 20252712 PMAQI
13th Sep 2025241 PMAQI
13th Sep 2025202 PMAQI
13th Sep 2025223 PMAQI
13th Sep 2025214 PMAQI
13th Sep 2025185 PMAQI
13th Sep 2025186 PMAQI
13th Sep 2025187 PMAQI
13th Sep 2025248 PMAQI
13th Sep 2025269 PMAQI
13th Sep 20252610 PMAQI
13th Sep 20252811 PMAQI
14th Sep 20253212 AMAQI
14th Sep 2025361 AMAQI
14th Sep 2025352 AMAQI
14th Sep 2025333 AMAQI
14th Sep 2025324 AMAQI

25°C21/29°C

14th Sep 2025325 AMAQI
14th Sep 2025326 AMAQI
14th Sep 2025327 AMAQI
14th Sep 2025338 AMAQI
14th Sep 2025249 AMAQI
14th Sep 20252210 AMAQI
14th Sep 20252211 AMAQI
14th Sep 20251812 PMAQI
14th Sep 2025201 PMAQI
14th Sep 2025202 PMAQI
14th Sep 2025233 PMAQI
14th Sep 2025234 PMAQI
14th Sep 2025255 PMAQI
14th Sep 2025256 PMAQI
14th Sep 2025327 PMAQI
14th Sep 2025308 PMAQI
14th Sep 2025329 PMAQI
14th Sep 20253310 PMAQI
14th Sep 20253011 PMAQI
15th Sep 20252912 AMAQI
15th Sep 2025331 AMAQI
15th Sep 2025342 AMAQI
15th Sep 2025353 AMAQI
15th Sep 2025324 AMAQI

23°C21/24°C

15th Sep 2025315 AMAQI
15th Sep 2025326 AMAQI
15th Sep 2025327 AMAQI
15th Sep 2025328 AMAQI
15th Sep 2025299 AMAQI
15th Sep 20252410 AMAQI
15th Sep 20253111 AMAQI
15th Sep 20254212 PMAQI
15th Sep 2025321 PMAQI
15th Sep 2025182 PMAQI
15th Sep 2025273 PMAQI
15th Sep 2025214 PMAQI
15th Sep 2025235 PMAQI
15th Sep 2025206 PMAQI
15th Sep 2025227 PMAQI
15th Sep 2025248 PMAQI
15th Sep 2025349 PMAQI
15th Sep 20253110 PMAQI
15th Sep 20253311 PMAQI
16th Sep 20253212 AMAQI
16th Sep 2025311 AMAQI
16th Sep 2025332 AMAQI
16th Sep 2025333 AMAQI
16th Sep 2025324 AMAQI

24°C21/28°C

16th Sep 2025325 AMAQI
16th Sep 2025326 AMAQI
16th Sep 2025327 AMAQI
16th Sep 2025338 AMAQI
16th Sep 2025339 AMAQI
16th Sep 20253810 AMAQI
16th Sep 20254211 AMAQI
16th Sep 20254012 PMAQI
16th Sep 2025351 PMAQI
16th Sep 2025352 PMAQI
16th Sep 2025383 PMAQI
16th Sep 2025404 PMAQI
16th Sep 2025405 PMAQI
16th Sep 2025306 PMAQI
16th Sep 2025427 PMAQI
16th Sep 2025378 PMAQI
16th Sep 2025389 PMAQI
16th Sep 20253810 PMAQI
16th Sep 20253411 PMAQI
17th Sep 20253812 AMAQI
17th Sep 2025331 AMAQI
17th Sep 2025332 AMAQI
17th Sep 2025333 AMAQI
17th Sep 2025324 AMAQI

25°C21/29°C

17th Sep 2025345 AMAQI
17th Sep 2025336 AMAQI
17th Sep 2025337 AMAQI
17th Sep 2025338 AMAQI
17th Sep 2025449 AMAQI
17th Sep 20255010 AMAQI
17th Sep 20255011 AMAQI
17th Sep 20254912 PMAQI
17th Sep 2025481 PMAQI
17th Sep 2025522 PMAQI
17th Sep 2025433 PMAQI
17th Sep 2025384 PMAQI
17th Sep 2025465 PMAQI
17th Sep 2025376 PMAQI
17th Sep 2025357 PMAQI
17th Sep 2025378 PMAQI
17th Sep 2025389 PMAQI
17th Sep 20253910 PMAQI
17th Sep 20253811 PMAQI
18th Sep 20253812 AMAQI
18th Sep 2025371 AMAQI
18th Sep 2025342 AMAQI
18th Sep 2025343 AMAQI
18th Sep 2025364 AMAQI

25°C22/29°C

18th Sep 2025385 AMAQI
18th Sep 2025376 AMAQI
18th Sep 2025377 AMAQI
18th Sep 2025368 AMAQI
18th Sep 2025409 AMAQI
18th Sep 20254210 AMAQI
18th Sep 20253411 AMAQI
18th Sep 20252412 PMAQI
18th Sep 2025191 PMAQI
18th Sep 2025182 PMAQI
18th Sep 2025183 PMAQI
18th Sep 2025274 PMAQI
18th Sep 2025255 PMAQI
18th Sep 2025176 PMAQI
18th Sep 2025167 PMAQI
18th Sep 2025228 PMAQI
18th Sep 2025349 PMAQI
18th Sep 20253410 PMAQI
18th Sep 20253411 PMAQI
19th Sep 20253612 AMAQI
19th Sep 2025361 AMAQI
19th Sep 2025352 AMAQI
19th Sep 2025353 AMAQI
19th Sep 2025354 AMAQI

21°C17/25°C

19th Sep 2025345 AMAQI
19th Sep 2025346 AMAQI
19th Sep 2025367 AMAQI
19th Sep 2025358 AMAQI
19th Sep 2025219 AMAQI
19th Sep 20251610 AMAQI
19th Sep 20251711 AMAQI
19th Sep 20251712 PMAQI
19th Sep 2025191 PMAQI
19th Sep 2025182 PMAQI
19th Sep 2025163 PMAQI
19th Sep 2025164 PMAQI
19th Sep 2025165 PMAQI
19th Sep 2025196 PMAQI
19th Sep 2025187 PMAQI
19th Sep 2025198 PMAQI
19th Sep 2025269 PMAQI
19th Sep 20252810 PMAQI
19th Sep 20252611 PMAQI
20th Sep 20252412 AMAQI
20th Sep 2025261 AMAQI
20th Sep 2025342 AMAQI
20th Sep 2025353 AMAQI
20th Sep 2025344 AMAQI

20°C18/24°C

20th Sep 2025305 AMAQI
20th Sep 2025306 AMAQI
20th Sep 2025317 AMAQI
20th Sep 2025308 AMAQI
20th Sep 2025229 AMAQI
20th Sep 20251810 AMAQI
20th Sep 20251611 AMAQI
20th Sep 20251812 PMAQI
20th Sep 2025221 PMAQI
20th Sep 2025152 PMAQI
20th Sep 2025163 PMAQI
20th Sep 2025194 PMAQI
20th Sep 2025185 PMAQI
20th Sep 2025166 PMAQI
20th Sep 2025177 PMAQI
20th Sep 2025208 PMAQI
20th Sep 2025249 PMAQI
20th Sep 20252410 PMAQI
20th Sep 20252611 PMAQI
21st Sep 20252812 AMAQI
21st Sep 2025281 AMAQI
21st Sep 2025282 AMAQI
21st Sep 2025303 AMAQI
21st Sep 2025294 AMAQI

22°C18/27°C

21st Sep 2025285 AMAQI
21st Sep 2025286 AMAQI
21st Sep 2025287 AMAQI
21st Sep 2025278 AMAQI
21st Sep 2025199 AMAQI
21st Sep 20251710 AMAQI
21st Sep 20251911 AMAQI
21st Sep 20251812 PMAQI
21st Sep 2025161 PMAQI
21st Sep 2025152 PMAQI
21st Sep 2025163 PMAQI
21st Sep 2025164 PMAQI
21st Sep 2025195 PMAQI
21st Sep 2025196 PMAQI
21st Sep 2025197 PMAQI
21st Sep 2025178 PMAQI
21st Sep 2025249 PMAQI
21st Sep 20252610 PMAQI
21st Sep 20252511 PMAQI
22nd Sep 20252412 AMAQI
22nd Sep 2025241 AMAQI
22nd Sep 2025282 AMAQI
22nd Sep 2025283 AMAQI
22nd Sep 2025284 AMAQI

20°C18/22°C

22nd Sep 2025265 AMAQI
22nd Sep 2025266 AMAQI
22nd Sep 2025257 AMAQI
22nd Sep 2025268 AMAQI
22nd Sep 2025209 AMAQI
22nd Sep 20252010 AMAQI
22nd Sep 20252011 AMAQI
22nd Sep 20252012 PMAQI
22nd Sep 2025181 PMAQI
22nd Sep 2025192 PMAQI
22nd Sep 2025163 PMAQI
22nd Sep 2025164 PMAQI
22nd Sep 2025165 PMAQI
22nd Sep 2025186 PMAQI
22nd Sep 2025237 PMAQI
22nd Sep 2025288 PMAQI
22nd Sep 2025309 PMAQI
22nd Sep 20252610 PMAQI
22nd Sep 20252611 PMAQI
23rd Sep 20252712 AMAQI
23rd Sep 2025261 AMAQI
23rd Sep 2025272 AMAQI
23rd Sep 2025273 AMAQI
23rd Sep 2025264 AMAQI

19°C15/23°C

23rd Sep 2025255 AMAQI
23rd Sep 2025266 AMAQI
23rd Sep 2025267 AMAQI
23rd Sep 2025258 AMAQI
23rd Sep 2025199 AMAQI
23rd Sep 20252210 AMAQI
23rd Sep 20252411 AMAQI
23rd Sep 20252112 PMAQI
23rd Sep 2025221 PMAQI
23rd Sep 2025252 PMAQI
23rd Sep 2025253 PMAQI
23rd Sep 2025184 PMAQI
23rd Sep 2025195 PMAQI
23rd Sep 2025236 PMAQI
23rd Sep 2025297 PMAQI
23rd Sep 2025308 PMAQI
23rd Sep 2025299 PMAQI
23rd Sep 20252610 PMAQI
23rd Sep 20252611 PMAQI
24th Sep 20252612 AMAQI
24th Sep 2025261 AMAQI
24th Sep 2025282 AMAQI
24th Sep 2025273 AMAQI
24th Sep 2025274 AMAQI

20°C16/25°C

24th Sep 2025275 AMAQI
24th Sep 2025276 AMAQI
24th Sep 2025267 AMAQI
24th Sep 2025278 AMAQI
24th Sep 2025269 AMAQI
24th Sep 20252610 AMAQI
24th Sep 20252211 AMAQI
24th Sep 20251912 PMAQI
24th Sep 2025211 PMAQI
24th Sep 2025222 PMAQI
24th Sep 2025283 PMAQI
24th Sep 2025284 PMAQI
24th Sep 2025265 PMAQI
24th Sep 2025286 PMAQI
24th Sep 2025337 PMAQI
24th Sep 2025368 PMAQI
24th Sep 2025319 PMAQI
24th Sep 20252910 PMAQI
24th Sep 20252611 PMAQI
25th Sep 20252612 AMAQI
25th Sep 2025271 AMAQI
25th Sep 2025282 AMAQI
25th Sep 2025283 AMAQI
25th Sep 2025284 AMAQI

22°C16/27°C

25th Sep 2025275 AMAQI
25th Sep 2025276 AMAQI
25th Sep 2025267 AMAQI
25th Sep 2025278 AMAQI
25th Sep 2025229 AMAQI
25th Sep 20251810 AMAQI
25th Sep 20252111 AMAQI
25th Sep 20251912 PMAQI
25th Sep 2025211 PMAQI
25th Sep 2025212 PMAQI
25th Sep 2025233 PMAQI
25th Sep 2025204 PMAQI
25th Sep 2025175 PMAQI
25th Sep 2025206 PMAQI
25th Sep 2025277 PMAQI
25th Sep 2025268 PMAQI
25th Sep 2025279 PMAQI
25th Sep 20251710 PMAQI
25th Sep 20252111 PMAQI
26th Sep 20252212 AMAQI
26th Sep 2025221 AMAQI
26th Sep 2025182 AMAQI
26th Sep 2025103 AMAQI
26th Sep 2025174 AMAQI

22°C20/25°C

26th Sep 202595 AMAQI
26th Sep 202576 AMAQI
26th Sep 2025197 AMAQI
26th Sep 2025288 AMAQI
26th Sep 2025299 AMAQI
26th Sep 20252210 AMAQI
26th Sep 20252511 AMAQI
26th Sep 20253212 PMAQI
26th Sep 2025351 PMAQI
26th Sep 2025362 PMAQI
26th Sep 2025393 PMAQI
26th Sep 2025384 PMAQI
26th Sep 2025375 PMAQI
26th Sep 2025396 PMAQI
26th Sep 2025397 PMAQI
26th Sep 2025398 PMAQI
26th Sep 2025519 PMAQI
26th Sep 20253510 PMAQI
26th Sep 20252111 PMAQI
27th Sep 20253012 AMAQI
27th Sep 2025211 AMAQI
27th Sep 2025212 AMAQI
27th Sep 2025223 AMAQI
27th Sep 2025234 AMAQI

21°C19/23°C

27th Sep 2025265 AMAQI
27th Sep 2025246 AMAQI
27th Sep 2025207 AMAQI
27th Sep 2025208 AMAQI
27th Sep 2025269 AMAQI
27th Sep 20252310 AMAQI
27th Sep 20253011 AMAQI
27th Sep 20253712 PMAQI
27th Sep 2025321 PMAQI
27th Sep 2025172 PMAQI
27th Sep 2025193 PMAQI
27th Sep 2025204 PMAQI
27th Sep 2025185 PMAQI
27th Sep 2025166 PMAQI
27th Sep 2025167 PMAQI
27th Sep 2025278 PMAQI
27th Sep 2025279 PMAQI
27th Sep 20251810 PMAQI
27th Sep 20251811 PMAQI
28th Sep 20252612 AMAQI
28th Sep 2025281 AMAQI
28th Sep 2025232 AMAQI
28th Sep 2025293 AMAQI
28th Sep 2025244 AMAQI

19°C16/23°C

28th Sep 2025195 AMAQI
28th Sep 2025206 AMAQI
28th Sep 2025317 AMAQI
28th Sep 2025248 AMAQI
28th Sep 2025199 AMAQI
28th Sep 20252010 AMAQI
28th Sep 20251811 AMAQI
28th Sep 20251912 PMAQI
28th Sep 2025251 PMAQI
28th Sep 2025232 PMAQI
28th Sep 2025223 PMAQI
28th Sep 2025224 PMAQI
28th Sep 2025265 PMAQI
28th Sep 2025276 PMAQI
28th Sep 2025387 PMAQI
28th Sep 2025258 PMAQI
28th Sep 2025399 PMAQI
28th Sep 20254610 PMAQI
28th Sep 20253211 PMAQI
29th Sep 20252612 AMAQI
29th Sep 2025301 AMAQI
29th Sep 2025302 AMAQI
29th Sep 2025293 AMAQI
29th Sep 2025374 AMAQI

20°C16/26°C

29th Sep 2025395 AMAQI
29th Sep 2025176 AMAQI
29th Sep 202577 AMAQI
29th Sep 202568 AMAQI
29th Sep 2025109 AMAQI
29th Sep 20253310 AMAQI
29th Sep 20253011 AMAQI
29th Sep 20251912 PMAQI
29th Sep 2025281 PMAQI
29th Sep 2025342 PMAQI
29th Sep 2025243 PMAQI
29th Sep 2025134 PMAQI
29th Sep 2025295 PMAQI
29th Sep 2025116 PMAQI
29th Sep 2025257 PMAQI
29th Sep 2025158 PMAQI
29th Sep 2025219 PMAQI
29th Sep 20252910 PMAQI
29th Sep 20253511 PMAQI
30th Sep 20252312 AMAQI
30th Sep 2025261 AMAQI
30th Sep 2025222 AMAQI
30th Sep 2025203 AMAQI
30th Sep 2025224 AMAQI

20°C17/25°C

30th Sep 2025165 AMAQI
30th Sep 2025166 AMAQI
30th Sep 2025177 AMAQI
30th Sep 2025218 AMAQI
30th Sep 2025259 AMAQI
30th Sep 20252410 AMAQI
30th Sep 20252011 AMAQI
30th Sep 20252912 PMAQI
30th Sep 2025241 PMAQI
30th Sep 2025302 PMAQI
30th Sep 2025303 PMAQI
30th Sep 2025364 PMAQI
30th Sep 2025325 PMAQI
30th Sep 2025366 PMAQI
30th Sep 2025387 PMAQI
30th Sep 2025408 PMAQI
30th Sep 2025369 PMAQI
30th Sep 20253010 PMAQI
30th Sep 20253111 PMAQI
1st Oct 20253012 AMAQI
1st Oct 2025271 AMAQI
1st Oct 2025322 AMAQI
1st Oct 2025333 AMAQI
1st Oct 2025324 AMAQI

19°C16/23°C

1st Oct 2025285 AMAQI
1st Oct 2025336 AMAQI
1st Oct 2025357 AMAQI
1st Oct 2025378 AMAQI
1st Oct 2025459 AMAQI
1st Oct 20254310 AMAQI
1st Oct 20254011 AMAQI
1st Oct 20252912 PMAQI
1st Oct 2025171 PMAQI
1st Oct 2025172 PMAQI
1st Oct 2025173 PMAQI
1st Oct 2025244 PMAQI
1st Oct 2025375 PMAQI
1st Oct 2025436 PMAQI
1st Oct 2025387 PMAQI
1st Oct 2025488 PMAQI
1st Oct 2025479 PMAQI
1st Oct 20254410 PMAQI
1st Oct 20254411 PMAQI
2nd Oct 20253912 AMAQI
2nd Oct 2025401 AMAQI
2nd Oct 2025522 AMAQI
2nd Oct 2025483 AMAQI
2nd Oct 2025384 AMAQI

19°C18/20°C

2nd Oct 2025365 AMAQI
2nd Oct 2025326 AMAQI
2nd Oct 2025427 AMAQI
2nd Oct 2025388 AMAQI
2nd Oct 2025359 AMAQI
2nd Oct 20253310 AMAQI
2nd Oct 20254011 AMAQI
2nd Oct 20254312 PMAQI
2nd Oct 2025361 PMAQI
2nd Oct 2025482 PMAQI
2nd Oct 2025483 PMAQI
2nd Oct 2025524 PMAQI
2nd Oct 2025505 PMAQI
2nd Oct 2025466 PMAQI
2nd Oct 2025387 PMAQI
2nd Oct 2025408 PMAQI
2nd Oct 2025419 PMAQI
2nd Oct 20255010 PMAQI
2nd Oct 20255311 PMAQI
3rd Oct 20255312 AMAQI
3rd Oct 2025501 AMAQI
3rd Oct 2025392 AMAQI
3rd Oct 2025353 AMAQI
3rd Oct 2025474 AMAQI

18°C15/23°C

3rd Oct 2025505 AMAQI
3rd Oct 2025526 AMAQI
3rd Oct 2025547 AMAQI
3rd Oct 2025558 AMAQI
3rd Oct 2025459 AMAQI
3rd Oct 20253510 AMAQI
3rd Oct 20253411 AMAQI
3rd Oct 20253312 PMAQI
3rd Oct 2025351 PMAQI
3rd Oct 2025422 PMAQI
3rd Oct 2025423 PMAQI
3rd Oct 2025434 PMAQI
3rd Oct 2025425 PMAQI
3rd Oct 2025476 PMAQI
3rd Oct 2025487 PMAQI
3rd Oct 2025438 PMAQI
3rd Oct 2025639 PMAQI
3rd Oct 20256610 PMAQI
3rd Oct 20256211 PMAQI
4th Oct 20256012 AMAQI
4th Oct 2025551 AMAQI
4th Oct 2025542 AMAQI
4th Oct 2025543 AMAQI
4th Oct 2025574 AMAQI

19°C15/25°C

4th Oct 2025605 AMAQI
4th Oct 2025586 AMAQI
4th Oct 2025587 AMAQI
4th Oct 2025708 AMAQI
4th Oct 2025619 AMAQI
4th Oct 20255610 AMAQI
4th Oct 20256011 AMAQI
4th Oct 20257312 PMAQI
4th Oct 2025761 PMAQI
4th Oct 2025702 PMAQI
4th Oct 2025573 PMAQI
4th Oct 2025594 PMAQI
4th Oct 2025545 PMAQI
4th Oct 2025536 PMAQI
4th Oct 2025557 PMAQI
4th Oct 2025458 PMAQI
4th Oct 2025389 PMAQI
4th Oct 20254210 PMAQI
4th Oct 20255111 PMAQI
5th Oct 20255512 AMAQI
5th Oct 2025541 AMAQI
5th Oct 2025542 AMAQI
5th Oct 2025533 AMAQI
5th Oct 2025544 AMAQI

20°C17/25°C

5th Oct 2025405 AMAQI
5th Oct 2025486 AMAQI
5th Oct 2025517 AMAQI
5th Oct 2025518 AMAQI
5th Oct 2025529 AMAQI
5th Oct 20255610 AMAQI
5th Oct 20255411 AMAQI
5th Oct 20255012 PMAQI
5th Oct 2025571 PMAQI
5th Oct 2025512 PMAQI
5th Oct 2025473 PMAQI
5th Oct 2025434 PMAQI
5th Oct 2025415 PMAQI
5th Oct 2025526 PMAQI
5th Oct 2025517 PMAQI
5th Oct 2025488 PMAQI
5th Oct 2025399 PMAQI
5th Oct 20254210 PMAQI
5th Oct 20255811 PMAQI
6th Oct 20256412 AMAQI
6th Oct 2025571 AMAQI
6th Oct 2025562 AMAQI
6th Oct 2025553 AMAQI
6th Oct 2025544 AMAQI

21°C19/24°C

6th Oct 2025535 AMAQI
6th Oct 2025506 AMAQI
6th Oct 2025517 AMAQI
6th Oct 2025538 AMAQI
6th Oct 2025559 AMAQI
6th Oct 20255310 AMAQI
6th Oct 20255711 AMAQI
6th Oct 20254612 PMAQI
6th Oct 2025451 PMAQI
6th Oct 2025532 PMAQI
6th Oct 2025523 PMAQI
6th Oct 2025544 PMAQI
6th Oct 2025555 PMAQI
6th Oct 2025546 PMAQI
6th Oct 2025577 PMAQI
6th Oct 2025588 PMAQI
6th Oct 2025599 PMAQI
6th Oct 20255910 PMAQI
6th Oct 20256011 PMAQI
7th Oct 20255412 AMAQI
7th Oct 2025561 AMAQI
7th Oct 2025602 AMAQI

20°C17/22°C

7th Oct 2025528 PMAQI
7th Oct 2025349 PMAQI
7th Oct 20256510 PMAQI
7th Oct 20257011 PMAQI
8th Oct 20255712 AMAQI
8th Oct 2025531 AMAQI
8th Oct 2025542 AMAQI
8th Oct 2025493 AMAQI
8th Oct 2025494 AMAQI

20°C15/25°C

8th Oct 2025525 AMAQI
8th Oct 2025476 AMAQI
8th Oct 2025577 AMAQI
8th Oct 2025538 AMAQI
8th Oct 2025519 AMAQI
8th Oct 20255210 AMAQI
8th Oct 20255611 AMAQI
8th Oct 20255912 PMAQI
8th Oct 2025621 PMAQI
8th Oct 2025632 PMAQI
8th Oct 2025613 PMAQI
8th Oct 2025554 PMAQI
8th Oct 2025575 PMAQI
8th Oct 2025626 PMAQI
8th Oct 2025637 PMAQI
8th Oct 2025568 PMAQI
8th Oct 2025529 PMAQI
8th Oct 20255510 PMAQI
8th Oct 20255711 PMAQI
9th Oct 20255412 AMAQI
9th Oct 2025571 AMAQI
9th Oct 2025482 AMAQI
9th Oct 2025463 AMAQI
9th Oct 2025484 AMAQI

20°C19/22°C

9th Oct 2025455 AMAQI
9th Oct 2025406 AMAQI
9th Oct 2025487 AMAQI
9th Oct 2025508 AMAQI
9th Oct 2025549 AMAQI
9th Oct 20256810 AMAQI
9th Oct 20256311 AMAQI
9th Oct 20256312 PMAQI
9th Oct 2025631 PMAQI
9th Oct 2025642 PMAQI
9th Oct 2025643 PMAQI
9th Oct 2025644 PMAQI
9th Oct 2025595 PMAQI
9th Oct 2025536 PMAQI
9th Oct 2025487 PMAQI
9th Oct 2025488 PMAQI
9th Oct 2025599 PMAQI
9th Oct 20255510 PMAQI
9th Oct 20255311 PMAQI
10th Oct 20255612 AMAQI
10th Oct 2025561 AMAQI
10th Oct 2025582 AMAQI
10th Oct 2025593 AMAQI
10th Oct 2025584 AMAQI

18°C14/20°C

10th Oct 2025585 AMAQI
10th Oct 2025556 AMAQI
10th Oct 2025557 AMAQI
10th Oct 2025588 AMAQI
10th Oct 2025569 AMAQI
10th Oct 20254610 AMAQI
10th Oct 20255111 AMAQI
10th Oct 20255212 PMAQI
10th Oct 2025511 PMAQI
10th Oct 2025482 PMAQI
10th Oct 2025433 PMAQI
10th Oct 2025484 PMAQI
10th Oct 2025555 PMAQI
10th Oct 2025636 PMAQI
10th Oct 2025587 PMAQI
10th Oct 2025668 PMAQI
10th Oct 2025649 PMAQI
10th Oct 20256410 PMAQI
10th Oct 20255611 PMAQI
11th Oct 20256212 AMAQI
11th Oct 2025621 AMAQI
11th Oct 2025632 AMAQI
11th Oct 2025563 AMAQI
11th Oct 2025484 AMAQI

17°C13/20°C

11th Oct 2025465 AMAQI
11th Oct 2025546 AMAQI
11th Oct 2025547 AMAQI
11th Oct 2025548 AMAQI
11th Oct 2025569 AMAQI
11th Oct 20255310 AMAQI
11th Oct 20255511 AMAQI
11th Oct 20255712 PMAQI
11th Oct 2025561 PMAQI
11th Oct 2025562 PMAQI
11th Oct 2025563 PMAQI
11th Oct 2025584 PMAQI
11th Oct 2025535 PMAQI
11th Oct 2025556 PMAQI
11th Oct 2025537 PMAQI
11th Oct 2025538 PMAQI
11th Oct 2025649 PMAQI
11th Oct 20256210 PMAQI
11th Oct 20255911 PMAQI
12th Oct 20255212 AMAQI
12th Oct 2025571 AMAQI
12th Oct 2025602 AMAQI
12th Oct 2025583 AMAQI
12th Oct 2025604 AMAQI

17°C15/18°C

12th Oct 2025485 AMAQI
12th Oct 2025396 AMAQI
12th Oct 2025367 AMAQI
12th Oct 2025488 AMAQI
12th Oct 2025569 AMAQI
12th Oct 20254810 AMAQI
12th Oct 20255111 AMAQI
12th Oct 20255812 PMAQI
12th Oct 2025561 PMAQI
12th Oct 2025612 PMAQI
12th Oct 2025543 PMAQI
12th Oct 2025484 PMAQI
12th Oct 2025745 PMAQI
12th Oct 2025706 PMAQI
12th Oct 2025747 PMAQI
12th Oct 2025718 PMAQI
12th Oct 2025659 PMAQI
12th Oct 20256110 PMAQI
12th Oct 20257011 PMAQI
13th Oct 20256712 AMAQI
13th Oct 2025701 AMAQI
13th Oct 2025522 AMAQI
13th Oct 2025463 AMAQI
13th Oct 2025464 AMAQI

22°C17/26°C

13th Oct 2025505 AMAQI
5 AM
13th Oct 2025516 AMAQI
13th Oct 2025547 AMAQI
13th Oct 2025548 AMAQI
13th Oct 2025549 AMAQI
13th Oct 20255410 AMAQI
13th Oct 20255611 AMAQI
11 AM
13th Oct 20255712 PMAQI
13th Oct 2025531 PMAQI
13th Oct 2025472 PMAQI
13th Oct 2025453 PMAQI
13th Oct 2025484 PMAQI
13th Oct 2025465 PMAQI
5 PM
13th Oct 2025546 PMAQI
13th Oct 2025577 PMAQI
13th Oct 2025568 PMAQI
11 PM
4 AM

--°C/°C

Day time
Avg. Highest Time
5 AM - 5 PM

36AQI

13 hours / Day
390 hours / Month
Avg. Lowest Time
5 AM - 4 PM

36AQI

12 hours / Day
360 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 5 PM (Avg. 36), while the lowest AQI was between 5 AM to 4 PM (Avg. 36).
Night time
Avg. Highest Time
9 PM - 11 PM

40AQI

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

37AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 PM to 11 PM (Avg. 40), while the lowest AQI was between 3 AM to 6 PM (Avg. 37).

2025 Days Vs Air Quality

Itoigawa, Niigata, Japan

2025

82%

234

18%

51

Total number of days with different AQI categories in last 286 days in 2025 (79 days remaining)

Good
234 Days
Moderate
51 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days



Under WHO’s Safe Air Quality Limits: 82%

Health Risk Level:

Low

In 2025, 82% of 286 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

Itoigawa, Niigata, 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.

-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
1st January 2025
31AQI
2nd January 2025
29AQI
3rd January 2025
27AQI
4th January 2025
27AQI
5th January 2025
26AQI
6th January 2025
30AQI
7th January 2025
29AQI
8th January 2025
29AQI
9th January 2025
30AQI
10th January 2025
28AQI
11th January 2025
28AQI
12th January 2025
27AQI
13th January 2025
30AQI
14th January 2025
35AQI
15th January 2025
28AQI
16th January 2025
27AQI
17th January 2025
28AQI
18th January 2025
28AQI
19th January 2025
30AQI
20th January 2025
33AQI
21st January 2025
40AQI
22nd January 2025
35AQI
23rd January 2025
46AQI
24th January 2025
39AQI
25th January 2025
38AQI
26th January 2025
31AQI
27th January 2025
28AQI
28th January 2025
30AQI
29th January 2025
29AQI
30th January 2025
31AQI
31st January 2025
32AQI
1st February 2025
35AQI
2nd February 2025
31AQI
3rd February 2025
33AQI
4th February 2025
32AQI
5th February 2025
31AQI
6th February 2025
31AQI
7th February 2025
35AQI
8th February 2025
31AQI
9th February 2025
31AQI
10th February 2025
30AQI
11th February 2025
32AQI
12th February 2025
30AQI
13th February 2025
35AQI
14th February 2025
33AQI
15th February 2025
32AQI
16th February 2025
35AQI
17th February 2025
40AQI
18th February 2025
32AQI
19th February 2025
33AQI
20th February 2025
31AQI
21st February 2025
32AQI
22nd February 2025
34AQI
23rd February 2025
33AQI
24th February 2025
32AQI
25th February 2025
34AQI
26th February 2025
44AQI
27th February 2025
50AQI
28th February 2025
47AQI
1st March 2025
49AQI
2nd March 2025
48AQI
3rd March 2025
40AQI
4th March 2025
38AQI
5th March 2025
30AQI
6th March 2025
33AQI
7th March 2025
36AQI
8th March 2025
36AQI
9th March 2025
35AQI
10th March 2025
40AQI
11th March 2025
37AQI
12th March 2025
34AQI
13th March 2025
50AQI
14th March 2025
38AQI
15th March 2025
37AQI
16th March 2025
28AQI
17th March 2025
28AQI
18th March 2025
30AQI
19th March 2025
23AQI
20th March 2025
34AQI
21st March 2025
50AQI
22nd March 2025
51AQI
23rd March 2025
66AQI
24th March 2025
63AQI
25th March 2025
75AQI
26th March 2025
69AQI
27th March 2025
70AQI
28th March 2025
57AQI
29th March 2025
44AQI
30th March 2025
36AQI
31st March 2025
36AQI
1st April 2025
31AQI
2nd April 2025
29AQI
3rd April 2025
23AQI
4th April 2025
22AQI
5th April 2025
31AQI
6th April 2025
27AQI
7th April 2025
34AQI
8th April 2025
38AQI
9th April 2025
30AQI
10th April 2025
38AQI
11th April 2025
44AQI
12th April 2025
42AQI
13th April 2025
32AQI
14th April 2025
34AQI
15th April 2025
25AQI
16th April 2025
38AQI
17th April 2025
43AQI
18th April 2025
52AQI
19th April 2025
58AQI
20th April 2025
48AQI
21st April 2025
42AQI
22nd April 2025
45AQI
23rd April 2025
35AQI
24th April 2025
26AQI
25th April 2025
39AQI
26th April 2025
48AQI
27th April 2025
48AQI
28th April 2025
47AQI
29th April 2025
46AQI
30th April 2025
49AQI
1st May 2025
54AQI
2nd May 2025
36AQI
3rd May 2025
40AQI
4th May 2025
36AQI
5th May 2025
38AQI
6th May 2025
35AQI
7th May 2025
29AQI
8th May 2025
30AQI
9th May 2025
36AQI
10th May 2025
28AQI
11th May 2025
28AQI
12th May 2025
39AQI
13th May 2025
48AQI
14th May 2025
51AQI
15th May 2025
55AQI
16th May 2025
56AQI
17th May 2025
42AQI
18th May 2025
52AQI
19th May 2025
47AQI
20th May 2025
63AQI
21st May 2025
64AQI
22nd May 2025
47AQI
23rd May 2025
48AQI
24th May 2025
47AQI
25th May 2025
34AQI
26th May 2025
33AQI
27th May 2025
36AQI
28th May 2025
35AQI
29th May 2025
39AQI
30th May 2025
35AQI
31st May 2025
28AQI
1st June 2025
32AQI
2nd June 2025
40AQI
3rd June 2025
43AQI
4th June 2025
40AQI
5th June 2025
42AQI
6th June 2025
47AQI
7th June 2025
52AQI
8th June 2025
56AQI
9th June 2025
60AQI
10th June 2025
62AQI
11th June 2025
47AQI
12th June 2025
48AQI
13th June 2025
41AQI
14th June 2025
41AQI
15th June 2025
30AQI
16th June 2025
36AQI
17th June 2025
39AQI
18th June 2025
45AQI
19th June 2025
50AQI
20th June 2025
55AQI
21st June 2025
60AQI
22nd June 2025
69AQI
23rd June 2025
48AQI
24th June 2025
46AQI
25th June 2025
48AQI
26th June 2025
41AQI
27th June 2025
56AQI
28th June 2025
43AQI
29th June 2025
43AQI
30th June 2025
53AQI
1st July 2025
54AQI
2nd July 2025
58AQI
3rd July 2025
60AQI
4th July 2025
67AQI
5th July 2025
68AQI
6th July 2025
59AQI
7th July 2025
61AQI
8th July 2025
59AQI
9th July 2025
55AQI
10th July 2025
48AQI
11th July 2025
49AQI
12th July 2025
47AQI
13th July 2025
50AQI
14th July 2025
48AQI
15th July 2025
40AQI
16th July 2025
47AQI
17th July 2025
35AQI
18th July 2025
37AQI
19th July 2025
36AQI
20th July 2025
38AQI
21st July 2025
38AQI
22nd July 2025
42AQI
23rd July 2025
43AQI
24th July 2025
46AQI
25th July 2025
50AQI
26th July 2025
46AQI
27th July 2025
42AQI
28th July 2025
45AQI
29th July 2025
41AQI
30th July 2025
43AQI
31st July 2025
46AQI
1st August 2025
46AQI
2nd August 2025
43AQI
3rd August 2025
44AQI
4th August 2025
54AQI
5th August 2025
49AQI
6th August 2025
44AQI
7th August 2025
40AQI
8th August 2025
37AQI
9th August 2025
34AQI
10th August 2025
35AQI
11th August 2025
30AQI
12th August 2025
31AQI
13th August 2025
31AQI
14th August 2025
32AQI
15th August 2025
34AQI
16th August 2025
34AQI
17th August 2025
39AQI
18th August 2025
41AQI
19th August 2025
47AQI
20th August 2025
51AQI
21st August 2025
51AQI
22nd August 2025
52AQI
23rd August 2025
51AQI
24th August 2025
54AQI
25th August 2025
54AQI
26th August 2025
54AQI
27th August 2025
48AQI
28th August 2025
40AQI
29th August 2025
48AQI
30th August 2025
47AQI
31st August 2025
48AQI
1st September 2025
43AQI
2nd September 2025
39AQI
3rd September 2025
33AQI
4th September 2025
32AQI
5th September 2025
29AQI
6th September 2025
28AQI
7th September 2025
30AQI
8th September 2025
32AQI
9th September 2025
36AQI
10th September 2025
33AQI
11th September 2025
30AQI
12th September 2025
29AQI
13th September 2025
27AQI
14th September 2025
29AQI
15th September 2025
29AQI
16th September 2025
35AQI
17th September 2025
39AQI
18th September 2025
30AQI
19th September 2025
26AQI
20th September 2025
24AQI
21st September 2025
23AQI
22nd September 2025
23AQI
23rd September 2025
25AQI
24th September 2025
27AQI
25th September 2025
23AQI
26th September 2025
27AQI
27th September 2025
22AQI
28th September 2025
25AQI
29th September 2025
25AQI
30th September 2025
27AQI
1st October 2025
37AQI
2nd October 2025
44AQI
3rd October 2025
48AQI
4th October 2025
56AQI
5th October 2025
52AQI
6th October 2025
58AQI
7th October 2025
56AQI
8th October 2025
56AQI
9th October 2025
55AQI
10th October 2025
56AQI
11th October 2025
56AQI
12th October 2025
55AQI
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
10th November 2025
11th November 2025
12th November 2025
13th November 2025
14th November 2025
15th November 2025
16th November 2025
17th November 2025
18th November 2025
19th November 2025
20th November 2025
21st November 2025
22nd November 2025
23rd November 2025
24th November 2025
25th November 2025
26th November 2025
27th November 2025
28th November 2025
29th November 2025
30th November 2025
1st December 2025
2nd December 2025
3rd December 2025
4th December 2025
5th December 2025
6th December 2025
7th December 2025
8th December 2025
9th December 2025
10th December 2025
11th December 2025
12th December 2025
13th December 2025
14th December 2025
15th December 2025
16th December 2025
17th December 2025
18th December 2025
19th December 2025
20th December 2025
21st December 2025
22nd December 2025
23rd December 2025
24th December 2025
25th December 2025
26th December 2025
27th December 2025
28th December 2025
29th December 2025
30th December 2025
31st December 2025

31AQI

34AQI

43AQI

38AQI

42AQI

47AQI

48AQI

43AQI

29AQI

52AQI


No. of days

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

202540AQI

31
28
24
7
28
2
24
7
21
9
22
9
23
8
30
3
9
234
51

Highest AQI recorded in

October

52AQI


Lowest AQI recorded in

September

29AQI


202437AQI

31
29
25
6
15
15
30
1
16
14
28
3
30
1
26
4
31
27
3
31
319
47

Highest AQI recorded in

April

51AQI


Lowest AQI recorded in

December

27AQI


202338AQI

31
28
23
8
21
9
24
7
25
5
19
12
30
1
29
1
31
26
3
30
1
317
47

Highest AQI recorded in

April

48AQI


Lowest AQI recorded in

January

30AQI


202237AQI

31
21
25
6
14
3
20
11
22
8
17
4
1
27
1
30
1
29
1
31
268
35

Highest AQI recorded in

May

47AQI


Lowest AQI recorded in

December

27AQI


202134AQI

30
1
24
4
27
2
18
3
25
6
19
11
23
8
26
5
30
31
30
23
306
40

Highest AQI recorded in

June

49AQI


Lowest AQI recorded in

January

24AQI


202030AQI

12
1
21
17
1
24
6
28
1
14
15
2
19
30
1
27
3
31
223
28
2

Highest AQI recorded in

August

55AQI


Lowest AQI recorded in

December

19AQI


Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2025(Avg.)
40AQI
Least Polluted Year Recorded
2020(Avg.)
30AQI


Itoigawa's annual 2025 AQI (40) shows an average percentage change of 14.8% (worsened AQI) compared to previous years: 2020 (30), 2021 (34), 2022 (37), 2023 (38), 2024 (37).