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HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Chikusei, Ibaraki, 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

Chikusei, Ibaraki, Japan

2022
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
22nd Oct 2022
82AQI
Lowest AQI recorded on
30th Oct 2024
21AQI

Same Day Analysis (1st October):
On this day, AQI across the 4 years varied significantly: 2026 ranks 4th highest AQI at 39 of Good air quality, showing improvement over 2025, 2024 and 2022 on the same day.

Day & Night AQI Trend: 30th Sep - 1st Oct 2026

Chikusei, Ibaraki, Japan

AQI
Day
Night
.

5 AM30th Sep 2026

5 PM

4 AM1st Oct 2026

Day time
Avg. Highest Time
10AM30th Sep

55AQI

Avg. Lowest Time
7AM30th Sep

31AQI

Night time
Avg. Highest Time
11PM30th Sep

51AQI

Avg. Lowest Time
7PM30th Sep

25AQI

In the last 24 hours,

Chikusei's AQI reached its highest point of 55 at 10 AM during the Day, while the lowest point, 25, was recorded at 7 PM during the Night between 30th Sep and 1st Oct 2026.

Day & Night AQI Trend : Sep - Oct 2026

Chikusei, Ibaraki, Japan

SepOct
02nd - 03rd03rd - 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
Day
Night
2nd Sep 2026295 AMAQI
2nd Sep 2026276 AMAQI
2nd Sep 2026427 AMAQI
2nd Sep 2026428 AMAQI
2nd Sep 2026449 AMAQI
2nd Sep 20263410 AMAQI
2nd Sep 20264611 AMAQI
2nd Sep 20263812 PMAQI
2nd Sep 2026341 PMAQI
2nd Sep 2026232 PMAQI
2nd Sep 2026423 PMAQI
2nd Sep 2026214 PMAQI
2nd Sep 2026405 PMAQI
2nd Sep 2026556 PMAQI
2nd Sep 2026517 PMAQI
2nd Sep 2026518 PMAQI
2nd Sep 2026469 PMAQI
2nd Sep 20264010 PMAQI
2nd Sep 20262711 PMAQI
3rd Sep 20262712 AMAQI
3rd Sep 2026311 AMAQI
3rd Sep 2026312 AMAQI
3rd Sep 2026293 AMAQI
3rd Sep 2026254 AMAQI

27°C23/32°C

3rd Sep 2026315 AMAQI
3rd Sep 2026386 AMAQI
3rd Sep 2026367 AMAQI
3rd Sep 2026298 AMAQI
3rd Sep 2026299 AMAQI
3rd Sep 20263310 AMAQI
3rd Sep 20264011 AMAQI
3rd Sep 20262512 PMAQI
3rd Sep 2026291 PMAQI
3rd Sep 2026382 PMAQI
3rd Sep 2026423 PMAQI
3rd Sep 2026594 PMAQI
3rd Sep 2026385 PMAQI
3rd Sep 2026256 PMAQI
3rd Sep 2026257 PMAQI
3rd Sep 2026178 PMAQI
3rd Sep 2026239 PMAQI
3rd Sep 20262110 PMAQI
3rd Sep 20263811 PMAQI
4th Sep 20262312 AMAQI
4th Sep 2026341 AMAQI
4th Sep 2026332 AMAQI
4th Sep 2026273 AMAQI
4th Sep 2026214 AMAQI

26°C23/32°C

4th Sep 2026215 AMAQI
4th Sep 2026216 AMAQI
4th Sep 2026237 AMAQI
4th Sep 2026218 AMAQI
4th Sep 2026319 AMAQI
4th Sep 20262310 AMAQI
4th Sep 20262511 AMAQI
4th Sep 20262512 PMAQI
4th Sep 2026231 PMAQI
4th Sep 2026252 PMAQI
4th Sep 2026343 PMAQI
4th Sep 2026214 PMAQI
4th Sep 2026335 PMAQI
4th Sep 2026336 PMAQI
4th Sep 2026387 PMAQI
4th Sep 2026428 PMAQI
4th Sep 2026249 PMAQI
4th Sep 20265010 PMAQI
4th Sep 20266011 PMAQI
5th Sep 20265612 AMAQI
5th Sep 2026531 AMAQI
5th Sep 2026512 AMAQI
5th Sep 2026513 AMAQI
5th Sep 2026444 AMAQI

23°C21/26°C

5th Sep 2026405 AMAQI
5th Sep 2026346 AMAQI
5th Sep 2026487 AMAQI
5th Sep 2026468 AMAQI
5th Sep 2026519 AMAQI
5th Sep 20266010 AMAQI
5th Sep 20267011 AMAQI
5th Sep 20266212 PMAQI
5th Sep 2026521 PMAQI
5th Sep 2026642 PMAQI
5th Sep 2026533 PMAQI
5th Sep 2026504 PMAQI
5th Sep 2026445 PMAQI
5th Sep 2026506 PMAQI
5th Sep 2026487 PMAQI
5th Sep 2026558 PMAQI
5th Sep 2026549 PMAQI
5th Sep 20265610 PMAQI
5th Sep 20266011 PMAQI
6th Sep 20265712 AMAQI
6th Sep 2026581 AMAQI
6th Sep 2026652 AMAQI
6th Sep 2026673 AMAQI
6th Sep 2026624 AMAQI

21°C21/23°C

6th Sep 2026655 AMAQI
6th Sep 2026666 AMAQI
6th Sep 2026607 AMAQI
6th Sep 2026698 AMAQI
6th Sep 2026629 AMAQI
6th Sep 20267210 AMAQI
6th Sep 20266511 AMAQI
6th Sep 20267412 PMAQI
6th Sep 2026601 PMAQI
6th Sep 2026662 PMAQI
6th Sep 2026573 PMAQI
6th Sep 2026404 PMAQI
6th Sep 2026315 PMAQI
6th Sep 2026346 PMAQI
6th Sep 2026407 PMAQI
6th Sep 2026468 PMAQI
6th Sep 2026489 PMAQI
6th Sep 20266010 PMAQI
6th Sep 20267811 PMAQI
7th Sep 20267012 AMAQI
7th Sep 2026651 AMAQI
7th Sep 2026672 AMAQI
7th Sep 2026653 AMAQI
7th Sep 2026604 AMAQI

22°C20/24°C

7th Sep 2026565 AMAQI
7th Sep 2026606 AMAQI
7th Sep 2026647 AMAQI
7th Sep 2026648 AMAQI
7th Sep 2026629 AMAQI
7th Sep 20264010 AMAQI
7th Sep 20262111 AMAQI
7th Sep 20265212 PMAQI
7th Sep 2026361 PMAQI
7th Sep 2026402 PMAQI
7th Sep 2026403 PMAQI
7th Sep 2026404 PMAQI
7th Sep 2026465 PMAQI
7th Sep 2026446 PMAQI
7th Sep 2026427 PMAQI
7th Sep 2026518 PMAQI
7th Sep 2026529 PMAQI
7th Sep 20266210 PMAQI
7th Sep 20266011 PMAQI
8th Sep 20265612 AMAQI
8th Sep 2026551 AMAQI
8th Sep 2026572 AMAQI
8th Sep 2026583 AMAQI
8th Sep 2026524 AMAQI

23°C22/24°C

8th Sep 2026525 AMAQI
8th Sep 2026426 AMAQI
8th Sep 2026487 AMAQI
8th Sep 2026548 AMAQI
8th Sep 2026449 AMAQI
8th Sep 20265210 AMAQI
8th Sep 20266011 AMAQI
8th Sep 20265512 PMAQI
8th Sep 2026601 PMAQI
8th Sep 2026602 PMAQI
8th Sep 2026553 PMAQI
8th Sep 2026534 PMAQI
8th Sep 2026525 PMAQI
8th Sep 2026466 PMAQI
8th Sep 2026487 PMAQI
8th Sep 2026528 PMAQI
8th Sep 2026569 PMAQI
8th Sep 20265410 PMAQI
8th Sep 20265711 PMAQI
9th Sep 20265312 AMAQI
9th Sep 2026601 AMAQI
9th Sep 2026602 AMAQI
9th Sep 2026543 AMAQI
9th Sep 2026504 AMAQI

24°C22/26°C

9th Sep 2026475 AMAQI
9th Sep 2026446 AMAQI
9th Sep 2026467 AMAQI
9th Sep 2026468 AMAQI
9th Sep 2026589 AMAQI
9th Sep 20266010 AMAQI
9th Sep 20266511 AMAQI
9th Sep 20264012 PMAQI
9th Sep 2026331 PMAQI
9th Sep 2026362 PMAQI
9th Sep 2026383 PMAQI
9th Sep 2026484 PMAQI
9th Sep 2026295 PMAQI
9th Sep 2026256 PMAQI
9th Sep 2026257 PMAQI
9th Sep 2026218 PMAQI
9th Sep 2026329 PMAQI
9th Sep 20262510 PMAQI
9th Sep 20262911 PMAQI
10th Sep 20262912 AMAQI
10th Sep 2026341 AMAQI
10th Sep 2026312 AMAQI
10th Sep 2026293 AMAQI
10th Sep 2026344 AMAQI

25°C19/33°C

10th Sep 2026235 AMAQI
10th Sep 2026236 AMAQI
10th Sep 2026317 AMAQI
10th Sep 2026318 AMAQI
10th Sep 2026409 AMAQI
10th Sep 20264010 AMAQI
10th Sep 20265211 AMAQI
10th Sep 20264912 PMAQI
10th Sep 2026271 PMAQI
10th Sep 2026382 PMAQI
10th Sep 2026343 PMAQI
10th Sep 2026314 PMAQI
10th Sep 2026405 PMAQI
10th Sep 2026256 PMAQI
10th Sep 2026337 PMAQI
10th Sep 2026448 PMAQI
10th Sep 2026409 PMAQI
10th Sep 20264410 PMAQI
10th Sep 20264211 PMAQI
11th Sep 20264412 AMAQI
11th Sep 2026441 AMAQI
11th Sep 2026442 AMAQI
11th Sep 2026363 AMAQI
11th Sep 2026334 AMAQI

19°C19/20°C

11th Sep 2026315 AMAQI
11th Sep 2026366 AMAQI
11th Sep 2026387 AMAQI
11th Sep 2026428 AMAQI
11th Sep 2026429 AMAQI
11th Sep 20264810 AMAQI
11th Sep 20263811 AMAQI
11th Sep 20264412 PMAQI
11th Sep 2026491 PMAQI
11th Sep 2026572 PMAQI
11th Sep 2026533 PMAQI
11th Sep 2026524 PMAQI
11th Sep 2026485 PMAQI
11th Sep 2026386 PMAQI
11th Sep 2026347 PMAQI
11th Sep 2026318 PMAQI
11th Sep 2026539 PMAQI
11th Sep 20264010 PMAQI
11th Sep 20264611 PMAQI
12th Sep 20264812 AMAQI
12th Sep 2026561 AMAQI
12th Sep 2026632 AMAQI
12th Sep 2026503 AMAQI
12th Sep 2026464 AMAQI

18°C18/19°C

12th Sep 2026465 AMAQI
12th Sep 2026426 AMAQI
12th Sep 2026387 AMAQI
12th Sep 2026428 AMAQI
12th Sep 2026539 AMAQI
12th Sep 20265510 AMAQI
12th Sep 20265711 AMAQI
12th Sep 20264812 PMAQI
12th Sep 2026551 PMAQI
12th Sep 2026422 PMAQI
12th Sep 2026343 PMAQI
12th Sep 2026404 PMAQI
12th Sep 2026365 PMAQI
12th Sep 2026306 PMAQI
12th Sep 2026347 PMAQI
12th Sep 2026428 PMAQI
12th Sep 2026469 PMAQI
12th Sep 20266010 PMAQI
12th Sep 20266811 PMAQI
13th Sep 20264812 AMAQI
13th Sep 2026441 AMAQI
13th Sep 2026342 AMAQI
13th Sep 2026333 AMAQI
13th Sep 2026384 AMAQI

22°C18/25°C

13th Sep 2026386 AMAQI
13th Sep 2026537 AMAQI
13th Sep 2026568 AMAQI
13th Sep 2026569 AMAQI
13th Sep 20265310 AMAQI
13th Sep 20263611 AMAQI
13th Sep 20265712 PMAQI
13th Sep 2026531 PMAQI
13th Sep 2026492 PMAQI
13th Sep 2026533 PMAQI
13th Sep 2026534 PMAQI
13th Sep 2026515 PMAQI
13th Sep 2026586 PMAQI
13th Sep 2026547 PMAQI
13th Sep 2026598 PMAQI
13th Sep 2026649 PMAQI
13th Sep 20266210 PMAQI
13th Sep 20266411 PMAQI
14th Sep 20265712 AMAQI
14th Sep 2026671 AMAQI
14th Sep 2026592 AMAQI
14th Sep 2026333 AMAQI
14th Sep 2026364 AMAQI

23°C21/27°C

14th Sep 2026445 AMAQI
14th Sep 2026446 AMAQI
14th Sep 2026297 AMAQI
14th Sep 2026298 AMAQI
14th Sep 2026299 AMAQI
14th Sep 20262110 AMAQI
14th Sep 20262111 AMAQI
14th Sep 20262112 PMAQI
14th Sep 2026321 PMAQI
14th Sep 2026252 PMAQI
14th Sep 2026273 PMAQI
14th Sep 2026254 PMAQI
14th Sep 2026255 PMAQI
14th Sep 2026296 PMAQI
14th Sep 2026297 PMAQI
14th Sep 2026238 PMAQI
14th Sep 2026319 PMAQI
14th Sep 20263110 PMAQI
14th Sep 20264211 PMAQI
15th Sep 20264212 AMAQI
15th Sep 2026251 AMAQI
15th Sep 2026292 AMAQI
15th Sep 2026253 AMAQI
15th Sep 2026214 AMAQI

26°C22/31°C

15th Sep 2026235 AMAQI
15th Sep 2026236 AMAQI
15th Sep 2026257 AMAQI
15th Sep 2026298 AMAQI
15th Sep 2026259 AMAQI
15th Sep 20261910 AMAQI
15th Sep 20262511 AMAQI
15th Sep 20262312 PMAQI
15th Sep 2026211 PMAQI
15th Sep 2026422 PMAQI
15th Sep 2026213 PMAQI
15th Sep 2026294 PMAQI
15th Sep 2026235 PMAQI
15th Sep 2026236 PMAQI
15th Sep 2026237 PMAQI
15th Sep 2026278 PMAQI
15th Sep 2026279 PMAQI
15th Sep 20262710 PMAQI
15th Sep 20263611 PMAQI
16th Sep 20262112 AMAQI
16th Sep 2026251 AMAQI
16th Sep 2026362 AMAQI
16th Sep 2026273 AMAQI
16th Sep 2026554 AMAQI

23°C21/25°C

16th Sep 2026545 AMAQI
16th Sep 2026526 AMAQI
16th Sep 2026527 AMAQI
16th Sep 2026538 AMAQI
16th Sep 2026509 AMAQI
16th Sep 20263810 AMAQI
16th Sep 20264011 AMAQI
16th Sep 20264412 PMAQI
16th Sep 2026401 PMAQI
16th Sep 2026482 PMAQI
16th Sep 2026473 PMAQI
16th Sep 2026554 PMAQI
16th Sep 2026575 PMAQI
16th Sep 2026526 PMAQI
16th Sep 2026547 PMAQI
16th Sep 2026588 PMAQI
16th Sep 2026589 PMAQI
16th Sep 20265410 PMAQI
16th Sep 20265211 PMAQI
17th Sep 20265312 AMAQI
17th Sep 2026461 AMAQI
17th Sep 2026512 AMAQI
17th Sep 2026473 AMAQI
17th Sep 2026604 AMAQI

20°C19/21°C

17th Sep 2026405 AMAQI
17th Sep 2026426 AMAQI
17th Sep 2026527 AMAQI
17th Sep 2026528 AMAQI
17th Sep 2026529 AMAQI
17th Sep 20267210 AMAQI
17th Sep 20266711 AMAQI
17th Sep 20265812 PMAQI
17th Sep 2026531 PMAQI
17th Sep 2026592 PMAQI
17th Sep 2026603 PMAQI
17th Sep 2026584 PMAQI
17th Sep 2026515 PMAQI
17th Sep 2026526 PMAQI
17th Sep 2026447 PMAQI
17th Sep 2026478 PMAQI
17th Sep 2026649 PMAQI
17th Sep 20266510 PMAQI
17th Sep 20265211 PMAQI
18th Sep 20264812 AMAQI
18th Sep 2026461 AMAQI
18th Sep 2026542 AMAQI
18th Sep 2026573 AMAQI
18th Sep 2026594 AMAQI

20°C18/23°C

18th Sep 2026625 AMAQI
18th Sep 2026626 AMAQI
18th Sep 2026747 AMAQI
18th Sep 2026648 AMAQI
18th Sep 2026629 AMAQI
18th Sep 20267110 AMAQI
18th Sep 20266611 AMAQI
18th Sep 20266912 PMAQI
18th Sep 2026441 PMAQI
18th Sep 2026522 PMAQI
18th Sep 2026483 PMAQI
18th Sep 2026564 PMAQI
18th Sep 2026545 PMAQI
18th Sep 2026566 PMAQI
18th Sep 2026517 PMAQI
18th Sep 2026508 PMAQI
18th Sep 2026499 PMAQI
18th Sep 20265210 PMAQI
18th Sep 20265911 PMAQI
19th Sep 20265612 AMAQI
19th Sep 2026621 AMAQI
19th Sep 2026702 AMAQI
19th Sep 2026553 AMAQI
19th Sep 2026604 AMAQI

20°C17/23°C

19th Sep 2026605 AMAQI
19th Sep 2026586 AMAQI
19th Sep 2026627 AMAQI
19th Sep 2026628 AMAQI
19th Sep 2026669 AMAQI
19th Sep 20266310 AMAQI
19th Sep 20265811 AMAQI
19th Sep 20267412 PMAQI
19th Sep 2026601 PMAQI
19th Sep 2026742 PMAQI
19th Sep 2026673 PMAQI
19th Sep 2026604 PMAQI
19th Sep 2026595 PMAQI
19th Sep 2026576 PMAQI
19th Sep 2026627 PMAQI
19th Sep 2026718 PMAQI
19th Sep 2026679 PMAQI
19th Sep 20266810 PMAQI
19th Sep 20267011 PMAQI
20th Sep 20267212 AMAQI
20th Sep 2026561 AMAQI
20th Sep 2026652 AMAQI
20th Sep 2026563 AMAQI
20th Sep 2026444 AMAQI

22°C19/26°C

20th Sep 2026505 AMAQI
20th Sep 2026526 AMAQI
20th Sep 2026497 AMAQI
20th Sep 2026488 AMAQI
20th Sep 2026449 AMAQI
20th Sep 20264610 AMAQI
20th Sep 20264911 AMAQI
20th Sep 20265012 PMAQI
20th Sep 2026401 PMAQI
20th Sep 2026362 PMAQI
20th Sep 2026363 PMAQI
20th Sep 2026294 PMAQI
20th Sep 2026385 PMAQI
20th Sep 2026466 PMAQI
20th Sep 2026407 PMAQI
20th Sep 2026528 PMAQI
20th Sep 2026469 PMAQI
20th Sep 20264910 PMAQI
20th Sep 20264811 PMAQI
21st Sep 20263612 AMAQI
21st Sep 2026271 AMAQI
21st Sep 2026402 AMAQI
21st Sep 2026403 AMAQI
21st Sep 2026404 AMAQI

21°C21/22°C

21st Sep 2026405 AMAQI
21st Sep 2026366 AMAQI
21st Sep 2026277 AMAQI
21st Sep 2026348 AMAQI
21st Sep 2026429 AMAQI
21st Sep 20263810 AMAQI
21st Sep 20264411 AMAQI
21st Sep 20264912 PMAQI
21st Sep 2026421 PMAQI
21st Sep 2026482 PMAQI
21st Sep 2026403 PMAQI
21st Sep 2026404 PMAQI
21st Sep 2026365 PMAQI
21st Sep 2026336 PMAQI
21st Sep 2026277 PMAQI
21st Sep 2026258 PMAQI
21st Sep 2026339 PMAQI
21st Sep 20263610 PMAQI
21st Sep 20263811 PMAQI
22nd Sep 20264212 AMAQI
22nd Sep 2026381 AMAQI
22nd Sep 2026522 AMAQI
22nd Sep 2026573 AMAQI
22nd Sep 2026484 AMAQI

22°C21/23°C

22nd Sep 2026345 AMAQI
22nd Sep 2026446 AMAQI
22nd Sep 2026387 AMAQI
22nd Sep 2026498 AMAQI
22nd Sep 2026539 AMAQI
22nd Sep 20266410 AMAQI
22nd Sep 20266011 AMAQI
22nd Sep 20265912 PMAQI
22nd Sep 2026601 PMAQI
22nd Sep 2026642 PMAQI
22nd Sep 2026623 PMAQI
22nd Sep 2026604 PMAQI
22nd Sep 2026585 PMAQI
22nd Sep 2026576 PMAQI
22nd Sep 2026667 PMAQI
22nd Sep 2026568 PMAQI
22nd Sep 2026449 PMAQI
22nd Sep 20263810 PMAQI
22nd Sep 20263811 PMAQI
23rd Sep 20264012 AMAQI
23rd Sep 2026401 AMAQI
23rd Sep 2026442 AMAQI
23rd Sep 2026423 AMAQI
23rd Sep 2026444 AMAQI

25°C22/29°C

23rd Sep 2026425 AMAQI
23rd Sep 2026426 AMAQI
23rd Sep 2026407 AMAQI
23rd Sep 2026368 AMAQI
23rd Sep 2026299 AMAQI
23rd Sep 20263610 AMAQI
23rd Sep 20263811 AMAQI
23rd Sep 20263112 PMAQI
23rd Sep 2026271 PMAQI
23rd Sep 2026422 PMAQI
23rd Sep 2026423 PMAQI
23rd Sep 2026364 PMAQI
23rd Sep 2026325 PMAQI
23rd Sep 2026386 PMAQI
23rd Sep 2026427 PMAQI
23rd Sep 2026408 PMAQI
23rd Sep 2026489 PMAQI
23rd Sep 20264210 PMAQI
23rd Sep 20264411 PMAQI
24th Sep 20264412 AMAQI
24th Sep 2026531 AMAQI
24th Sep 2026482 AMAQI
24th Sep 2026513 AMAQI
24th Sep 2026344 AMAQI

21°C19/23°C

24th Sep 2026365 AMAQI
24th Sep 2026406 AMAQI
24th Sep 2026427 AMAQI
24th Sep 2026428 AMAQI
24th Sep 2026389 AMAQI
24th Sep 20264210 AMAQI
24th Sep 20263211 AMAQI
24th Sep 20265212 PMAQI
24th Sep 2026581 PMAQI
24th Sep 2026602 PMAQI
24th Sep 2026533 PMAQI
24th Sep 2026564 PMAQI
24th Sep 2026535 PMAQI
24th Sep 2026536 PMAQI
24th Sep 2026467 PMAQI
24th Sep 2026578 PMAQI
24th Sep 2026589 PMAQI
24th Sep 20264210 PMAQI
24th Sep 20264611 PMAQI
25th Sep 20263412 AMAQI
25th Sep 2026381 AMAQI
25th Sep 2026532 AMAQI
25th Sep 2026463 AMAQI
25th Sep 2026534 AMAQI

23°C19/28°C

25th Sep 2026525 AMAQI
25th Sep 2026456 AMAQI
25th Sep 2026447 AMAQI
25th Sep 2026468 AMAQI
25th Sep 2026429 AMAQI
25th Sep 20265210 AMAQI
25th Sep 20265311 AMAQI
25th Sep 20264912 PMAQI
25th Sep 2026481 PMAQI
25th Sep 2026402 PMAQI
25th Sep 2026343 PMAQI
25th Sep 2026364 PMAQI
25th Sep 2026325 PMAQI
25th Sep 2026366 PMAQI
25th Sep 2026317 PMAQI
25th Sep 2026348 PMAQI
25th Sep 2026469 PMAQI
25th Sep 20265310 PMAQI
25th Sep 20264911 PMAQI
26th Sep 20265812 AMAQI
26th Sep 2026461 AMAQI
26th Sep 2026442 AMAQI
26th Sep 2026293 AMAQI
26th Sep 2026254 AMAQI

22°C20/24°C

26th Sep 2026275 AMAQI
26th Sep 2026276 AMAQI
26th Sep 2026297 AMAQI
26th Sep 2026328 AMAQI
26th Sep 2026369 AMAQI
26th Sep 20264610 AMAQI
26th Sep 20265111 AMAQI
26th Sep 20264012 PMAQI
26th Sep 2026421 PMAQI
26th Sep 2026442 PMAQI
26th Sep 2026403 PMAQI
26th Sep 2026384 PMAQI
26th Sep 2026405 PMAQI
26th Sep 2026446 PMAQI
26th Sep 2026407 PMAQI
26th Sep 2026408 PMAQI
26th Sep 2026429 PMAQI
26th Sep 20264210 PMAQI
26th Sep 20264011 PMAQI
27th Sep 20263812 AMAQI
27th Sep 2026311 AMAQI
27th Sep 2026252 AMAQI
27th Sep 2026363 AMAQI
27th Sep 2026314 AMAQI

18°C16/20°C

27th Sep 2026295 AMAQI
27th Sep 2026346 AMAQI
27th Sep 2026367 AMAQI
27th Sep 2026368 AMAQI
27th Sep 2026389 AMAQI
27th Sep 20263210 AMAQI
27th Sep 20265311 AMAQI
27th Sep 20262712 PMAQI
27th Sep 2026421 PMAQI
27th Sep 2026512 PMAQI
27th Sep 2026233 PMAQI
27th Sep 2026364 PMAQI
27th Sep 2026445 PMAQI
27th Sep 2026386 PMAQI
27th Sep 2026327 PMAQI
27th Sep 2026368 PMAQI
27th Sep 2026369 PMAQI
27th Sep 20262510 PMAQI
27th Sep 20263111 PMAQI
28th Sep 20265212 AMAQI
28th Sep 2026471 AMAQI
28th Sep 2026422 AMAQI
28th Sep 2026403 AMAQI
28th Sep 2026454 AMAQI

20°C17/23°C

28th Sep 2026495 AMAQI
28th Sep 2026486 AMAQI
28th Sep 2026487 AMAQI
28th Sep 2026408 AMAQI
28th Sep 2026489 AMAQI
28th Sep 20265910 AMAQI
28th Sep 20265711 AMAQI
28th Sep 20266212 PMAQI
28th Sep 2026551 PMAQI
28th Sep 2026562 PMAQI
28th Sep 2026583 PMAQI
28th Sep 2026504 PMAQI
28th Sep 2026425 PMAQI
28th Sep 2026346 PMAQI
28th Sep 2026407 PMAQI
28th Sep 2026348 PMAQI
28th Sep 2026369 PMAQI
28th Sep 20263610 PMAQI
28th Sep 20265411 PMAQI
29th Sep 20264212 AMAQI
29th Sep 2026441 AMAQI
29th Sep 2026472 AMAQI
29th Sep 2026543 AMAQI
29th Sep 2026544 AMAQI

21°C20/22°C

29th Sep 2026485 AMAQI
29th Sep 2026546 AMAQI
29th Sep 2026567 AMAQI
29th Sep 2026548 AMAQI
29th Sep 2026589 AMAQI
29th Sep 20265510 AMAQI
29th Sep 20265411 AMAQI
29th Sep 20265512 PMAQI
29th Sep 2026461 PMAQI
29th Sep 2026502 PMAQI
29th Sep 2026493 PMAQI
29th Sep 2026314 PMAQI
29th Sep 2026405 PMAQI
29th Sep 2026406 PMAQI
29th Sep 2026547 PMAQI
29th Sep 2026498 PMAQI
29th Sep 2026649 PMAQI
29th Sep 20267010 PMAQI
29th Sep 20266411 PMAQI
30th Sep 20265812 AMAQI
30th Sep 2026421 AMAQI
30th Sep 2026482 AMAQI
30th Sep 2026403 AMAQI
30th Sep 2026464 AMAQI

19°C17/21°C

30th Sep 2026445 AMAQI
30th Sep 2026336 AMAQI
30th Sep 2026317 AMAQI
30th Sep 2026348 AMAQI
30th Sep 2026509 AMAQI
30th Sep 20265510 AMAQI
30th Sep 20265111 AMAQI
30th Sep 20265312 PMAQI
30th Sep 2026441 PMAQI
30th Sep 2026442 PMAQI
30th Sep 2026343 PMAQI
30th Sep 2026404 PMAQI
30th Sep 2026445 PMAQI
30th Sep 2026316 PMAQI
30th Sep 2026257 PMAQI
30th Sep 2026428 PMAQI
30th Sep 2026489 PMAQI
30th Sep 20264910 PMAQI
30th Sep 20265111 PMAQI
1st Oct 20264512 AMAQI
1st Oct 2026441 AMAQI
1st Oct 2026342 AMAQI
1st Oct 2026443 AMAQI
1st Oct 2026424 AMAQI

19°C18/19°C

1st Oct 2026365 AMAQI
5 AM
1st Oct 2026426 AMAQI
1st Oct 2026407 AMAQI
1st Oct 2026498 AMAQI
1st Oct 2026529 AMAQI
1st Oct 20264210 AMAQI
1st Oct 20263611 AMAQI
11 AM
1st Oct 20263812 PMAQI
1st Oct 2026291 PMAQI
1st Oct 2026442 PMAQI
1st Oct 2026303 PMAQI
1st Oct 2026364 PMAQI
1st Oct 2026315 PMAQI
5 PM
1st Oct 2026446 PMAQI
1st Oct 2026387 PMAQI
1st Oct 2026328 PMAQI
1st Oct 2026259 PMAQI
1st Oct 20264410 PMAQI
1st Oct 20264611 PMAQI
11 PM
4 AM

21°C18/26°C

Day time
Avg. Highest Time
9 AM - 12 PM

47AQI

4 hours / Day
120 hours / Month
Avg. Lowest Time
5 AM - 8 AM

43AQI

4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 AM to 12 PM (Avg. 47), while the lowest AQI was between 5 AM to 8 AM (Avg. 43).
Night time
Avg. Highest Time
11 PM

50AQI

1 hours / Day
30 hours / Month
Avg. Lowest Time
6 PM - 7 PM

41AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 PM to 11 PM (Avg. 50), while the lowest AQI was between 6 PM to 7 PM (Avg. 41).

2026 Days Vs Air Quality

Chikusei, Ibaraki, Japan

2026

80%

218

20%

56

Total number of days with different AQI categories in last 274 days in 2026 (91 days remaining)

Good
218 Days
Moderate
56 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 80%

Health Risk Level:

Low

In 2026, 80% of 274 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

Chikusei, Ibaraki, Japan

AQI levels in 2026

AQI (US)
PM₂.₅
PM₁₀
CO
SO₂
NO₂
O₃
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
-1th undefined 2026
1st January 2026
19AQI (US)
2nd January 2026
23AQI (US)
3rd January 2026
27AQI (US)
4th January 2026
29AQI (US)
5th January 2026
42AQI (US)
6th January 2026
26AQI (US)
7th January 2026
39AQI (US)
8th January 2026
45AQI (US)
9th January 2026
28AQI (US)
10th January 2026
47AQI (US)
11th January 2026
49AQI (US)
12th January 2026
20AQI (US)
13th January 2026
37AQI (US)
14th January 2026
15AQI (US)
15th January 2026
36AQI (US)
16th January 2026
55AQI (US)
17th January 2026
46AQI (US)
18th January 2026
31AQI (US)
19th January 2026
49AQI (US)
20th January 2026
43AQI (US)
21st January 2026
19AQI (US)
22nd January 2026
27AQI (US)
23rd January 2026
41AQI (US)
24th January 2026
43AQI (US)
25th January 2026
39AQI (US)
26th January 2026
18AQI (US)
27th January 2026
25AQI (US)
28th January 2026
24AQI (US)
29th January 2026
19AQI (US)
30th January 2026
35AQI (US)
31st January 2026
40AQI (US)
1st February 2026
39AQI (US)
2nd February 2026
21AQI (US)
3rd February 2026
23AQI (US)
4th February 2026
44AQI (US)
5th February 2026
54AQI (US)
6th February 2026
56AQI (US)
7th February 2026
17AQI (US)
8th February 2026
17AQI (US)
9th February 2026
36AQI (US)
10th February 2026
42AQI (US)
11th February 2026
59AQI (US)
12th February 2026
31AQI (US)
13th February 2026
38AQI (US)
14th February 2026
67AQI (US)
15th February 2026
73AQI (US)
16th February 2026
58AQI (US)
17th February 2026
19AQI (US)
18th February 2026
33AQI (US)
19th February 2026
31AQI (US)
20th February 2026
32AQI (US)
21st February 2026
44AQI (US)
22nd February 2026
40AQI (US)
23rd February 2026
45AQI (US)
24th February 2026
36AQI (US)
25th February 2026
32AQI (US)
26th February 2026
10AQI (US)
27th February 2026
40AQI (US)
28th February 2026
48AQI (US)
1st March 2026
39AQI (US)
2nd March 2026
89AQI (US)
3rd March 2026
47AQI (US)
4th March 2026
61AQI (US)
5th March 2026
62AQI (US)
6th March 2026
55AQI (US)
7th March 2026
40AQI (US)
8th March 2026
15AQI (US)
9th March 2026
38AQI (US)
10th March 2026
59AQI (US)
11th March 2026
62AQI (US)
12th March 2026
69AQI (US)
13th March 2026
43AQI (US)
14th March 2026
50AQI (US)
15th March 2026
61AQI (US)
16th March 2026
61AQI (US)
17th March 2026
58AQI (US)
18th March 2026
58AQI (US)
19th March 2026
39AQI (US)
20th March 2026
34AQI (US)
21st March 2026
46AQI (US)
22nd March 2026
51AQI (US)
23rd March 2026
55AQI (US)
24th March 2026
46AQI (US)
25th March 2026
55AQI (US)
26th March 2026
25AQI (US)
27th March 2026
19AQI (US)
28th March 2026
49AQI (US)
29th March 2026
57AQI (US)
30th March 2026
59AQI (US)
31st March 2026
34AQI (US)
1st April 2026
17AQI (US)
2nd April 2026
26AQI (US)
3rd April 2026
47AQI (US)
4th April 2026
46AQI (US)
5th April 2026
23AQI (US)
6th April 2026
24AQI (US)
7th April 2026
41AQI (US)
8th April 2026
19AQI (US)
9th April 2026
32AQI (US)
10th April 2026
49AQI (US)
11th April 2026
38AQI (US)
12th April 2026
32AQI (US)
13th April 2026
36AQI (US)
14th April 2026
40AQI (US)
15th April 2026
39AQI (US)
16th April 2026
31AQI (US)
17th April 2026
39AQI (US)
18th April 2026
34AQI (US)
19th April 2026
39AQI (US)
20th April 2026
38AQI (US)
21st April 2026
42AQI (US)
22nd April 2026
47AQI (US)
23rd April 2026
38AQI (US)
24th April 2026
34AQI (US)
25th April 2026
46AQI (US)
26th April 2026
51AQI (US)
27th April 2026
49AQI (US)
28th April 2026
43AQI (US)
29th April 2026
40AQI (US)
30th April 2026
41AQI (US)
1st May 2026
51AQI (US)
2nd May 2026
52AQI (US)
3rd May 2026
39AQI (US)
4th May 2026
30AQI (US)
5th May 2026
19AQI (US)
6th May 2026
32AQI (US)
7th May 2026
34AQI (US)
8th May 2026
27AQI (US)
9th May 2026
26AQI (US)
10th May 2026
34AQI (US)
11th May 2026
31AQI (US)
12th May 2026
37AQI (US)
13th May 2026
42AQI (US)
14th May 2026
35AQI (US)
15th May 2026
35AQI (US)
16th May 2026
85AQI (US)
17th May 2026
67AQI (US)
18th May 2026
53AQI (US)
19th May 2026
49AQI (US)
20th May 2026
61AQI (US)
21st May 2026
59AQI (US)
22nd May 2026
61AQI (US)
23rd May 2026
54AQI (US)
24th May 2026
58AQI (US)
25th May 2026
48AQI (US)
26th May 2026
40AQI (US)
27th May 2026
27AQI (US)
28th May 2026
25AQI (US)
29th May 2026
26AQI (US)
30th May 2026
26AQI (US)
31st May 2026
28AQI (US)
1st June 2026
31AQI (US)
2nd June 2026
32AQI (US)
3rd June 2026
27AQI (US)
4th June 2026
24AQI (US)
5th June 2026
23AQI (US)
6th June 2026
23AQI (US)
7th June 2026
22AQI (US)
8th June 2026
20AQI (US)
9th June 2026
23AQI (US)
10th June 2026
25AQI (US)
11th June 2026
25AQI (US)
12th June 2026
25AQI (US)
13th June 2026
31AQI (US)
14th June 2026
57AQI (US)
15th June 2026
22AQI (US)
16th June 2026
22AQI (US)
17th June 2026
25AQI (US)
18th June 2026
26AQI (US)
19th June 2026
30AQI (US)
20th June 2026
23AQI (US)
21st June 2026
20AQI (US)
22nd June 2026
19AQI (US)
23rd June 2026
22AQI (US)
24th June 2026
22AQI (US)
25th June 2026
27AQI (US)
26th June 2026
30AQI (US)
27th June 2026
29AQI (US)
28th June 2026
31AQI (US)
29th June 2026
31AQI (US)
30th June 2026
25AQI (US)
1st July 2026
25AQI (US)
2nd July 2026
21AQI (US)
3rd July 2026
19AQI (US)
4th July 2026
32AQI (US)
5th July 2026
26AQI (US)
6th July 2026
24AQI (US)
7th July 2026
26AQI (US)
8th July 2026
23AQI (US)
9th July 2026
24AQI (US)
10th July 2026
26AQI (US)
11th July 2026
25AQI (US)
12th July 2026
25AQI (US)
13th July 2026
47AQI (US)
14th July 2026
41AQI (US)
15th July 2026
53AQI (US)
16th July 2026
72AQI (US)
17th July 2026
54AQI (US)
18th July 2026
25AQI (US)
19th July 2026
32AQI (US)
20th July 2026
37AQI (US)
21st July 2026
53AQI (US)
22nd July 2026
63AQI (US)
23rd July 2026
51AQI (US)
24th July 2026
34AQI (US)
25th July 2026
30AQI (US)
26th July 2026
30AQI (US)
27th July 2026
24AQI (US)
28th July 2026
42AQI (US)
29th July 2026
35AQI (US)
30th July 2026
38AQI (US)
31st July 2026
50AQI (US)
1st August 2026
54AQI (US)
2nd August 2026
52AQI (US)
3rd August 2026
22AQI (US)
4th August 2026
34AQI (US)
5th August 2026
43AQI (US)
6th August 2026
41AQI (US)
7th August 2026
48AQI (US)
8th August 2026
41AQI (US)
9th August 2026
41AQI (US)
10th August 2026
31AQI (US)
11th August 2026
37AQI (US)
12th August 2026
31AQI (US)
13th August 2026
38AQI (US)
14th August 2026
42AQI (US)
15th August 2026
44AQI (US)
16th August 2026
45AQI (US)
17th August 2026
37AQI (US)
18th August 2026
38AQI (US)
19th August 2026
46AQI (US)
20th August 2026
51AQI (US)
21st August 2026
37AQI (US)
22nd August 2026
40AQI (US)
23rd August 2026
47AQI (US)
24th August 2026
53AQI (US)
25th August 2026
52AQI (US)
26th August 2026
46AQI (US)
27th August 2026
26AQI (US)
28th August 2026
28AQI (US)
29th August 2026
38AQI (US)
30th August 2026
38AQI (US)
31st August 2026
42AQI (US)
1st September 2026
38AQI (US)
2nd September 2026
38AQI (US)
3rd September 2026
32AQI (US)
4th September 2026
30AQI (US)
5th September 2026
52AQI (US)
6th September 2026
58AQI (US)
7th September 2026
52AQI (US)
8th September 2026
53AQI (US)
9th September 2026
43AQI (US)
10th September 2026
35AQI (US)
11th September 2026
43AQI (US)
12th September 2026
47AQI (US)
13th September 2026
51AQI (US)
14th September 2026
34AQI (US)
15th September 2026
26AQI (US)
16th September 2026
47AQI (US)
17th September 2026
54AQI (US)
18th September 2026
57AQI (US)
19th September 2026
63AQI (US)
20th September 2026
48AQI (US)
21st September 2026
37AQI (US)
22nd September 2026
52AQI (US)
23rd September 2026
39AQI (US)
24th September 2026
47AQI (US)
25th September 2026
44AQI (US)
26th September 2026
39AQI (US)
27th September 2026
35AQI (US)
28th September 2026
47AQI (US)
29th September 2026
51AQI (US)
30th September 2026
43AQI (US)
1st October 2026
39AQI (US)
2nd October 2026
3rd October 2026
4th October 2026
5th October 2026
6th October 2026
7th October 2026
8th October 2026
9th October 2026
10th October 2026
11th October 2026
12th October 2026
13th October 2026
14th October 2026
15th October 2026
16th October 2026
17th October 2026
18th October 2026
19th October 2026
20th October 2026
21st October 2026
22nd October 2026
23rd October 2026
24th October 2026
25th October 2026
26th October 2026
27th October 2026
28th October 2026
29th October 2026
30th October 2026
31st October 2026
1st November 2026
2nd November 2026
3rd November 2026
4th November 2026
5th November 2026
6th November 2026
7th November 2026
8th November 2026
9th November 2026
10th November 2026
11th November 2026
12th November 2026
13th November 2026
14th November 2026
15th November 2026
16th November 2026
17th November 2026
18th November 2026
19th November 2026
20th November 2026
21st November 2026
22nd November 2026
23rd November 2026
24th November 2026
25th November 2026
26th November 2026
27th November 2026
28th November 2026
29th November 2026
30th November 2026
1st December 2026
2nd December 2026
3rd December 2026
4th December 2026
5th December 2026
6th December 2026
7th December 2026
8th December 2026
9th December 2026
10th December 2026
11th December 2026
12th December 2026
13th December 2026
14th December 2026
15th December 2026
16th December 2026
17th December 2026
18th December 2026
19th December 2026
20th December 2026
21st December 2026
22nd December 2026
23rd December 2026
24th December 2026
25th December 2026
26th December 2026
27th December 2026
28th December 2026
29th December 2026
30th December 2026
31st December 2026

33AQI (US)

39AQI (US)

50AQI (US)

37AQI (US)

42AQI (US)

26AQI (US)

36AQI (US)

41AQI (US)

45AQI (US)

39AQI (US)

No. of days

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

202639AQI (US)

30
1
22
6
15
16
29
1
21
10
29
1
25
6
26
5
20
10
1
218
56

Highest AQI (US) recorded in

March

50AQI (US)

Lowest AQI (US) recorded in

June

26AQI (US)

202541AQI (US)

29
2
28
26
5
29
1
30
1
29
1
24
7
25
6
27
3
15
16
10
20
14
17
286
79

Highest AQI (US) recorded in

November

54AQI (US)

Lowest AQI (US) recorded in

May

29AQI (US)

202440AQI (US)

16
2
5
2
1
12
29
1
19
12
31
12
17
27
4
27
3
31
213
38

Highest AQI (US) recorded in

September

54AQI (US)

Lowest AQI (US) recorded in

August

33AQI (US)

202347AQI (US)

13
6
1
16
9
2
1
18
13
2
3
3
28
3
80
34
3
1

Highest AQI (US) recorded in

February

59AQI (US)

Lowest AQI (US) recorded in

November

21AQI (US)

202244AQI (US)

24
7
18
3
21
10
14
3
24
7
16
14
14
7
1
26
2
23
8
19
11
15
6
214
79

Highest AQI (US) recorded in

August

53AQI (US)

Lowest AQI (US) recorded in

September

40AQI (US)

202140AQI (US)

25
5
20
8
25
5
26
4
25
6
23
7
30
1
26
5
27
3
28
3
25
5
23
8
303
60

Highest AQI (US) recorded in

June

44AQI (US)

Lowest AQI (US) recorded in

April

37AQI (US)

202040AQI (US)

8
4
20
1
16
2
23
7
28
3
17
14
19
28
3
19
11
6
4
1
184
49
1

Highest AQI (US) recorded in

December

51AQI (US)

Lowest AQI (US) recorded in

September

32AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
47AQI (US)
Least Polluted Year Recorded
2026(Avg.)
39AQI (US)

Chikusei's annual 2026 AQI (US) (39) shows an average percentage change of -6.7% (improved AQI (US)) compared to previous years: 2020 (40), 2021 (40), 2022 (44), 2023 (47), 2024 (40), 2025 (41).