Ko, 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+
August Air Quality Analysis
Ko, Chikusei, Ibaraki, Japan
2021
2022
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
28th Aug 2021
71AQILowest AQI recorded on
30th Aug 2024
19AQISame Day Analysis (5th August ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 49 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 5th Aug - 6th Aug 2025
Ko, Chikusei, Ibaraki, Japan
AQI
Day
Night
.
4 AM5th Aug 2025
6 PM
3 AM6th Aug 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
12PM5th Aug
66AQI
Avg. Lowest Time
7PM5th Aug
39AQI
In the last 24 hours,
Ko's AQI reached its highest point of 66 at 12 PM during the Night, while the lowest point, 39, was recorded at 7 PM during the Night between 5th Aug and 6th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Ko, Chikusei, Ibaraki, Japan
JulAug
07th - 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 - 06th06th
Day
Night
7th Jul 2025534 AMAQI
7th Jul 2025555 AMAQI
7th Jul 2025556 AMAQI
7th Jul 2025557 AMAQI
7th Jul 2025558 AMAQI
7th Jul 20251079 AMAQI
7th Jul 202512210 AMAQI
7th Jul 202512511 AMAQI
7th Jul 202511812 PMAQI
7th Jul 2025971 PMAQI
7th Jul 2025862 PMAQI
7th Jul 2025833 PMAQI
7th Jul 2025784 PMAQI
7th Jul 2025825 PMAQI
7th Jul 2025856 PMAQI
7th Jul 2025857 PMAQI
7th Jul 2025828 PMAQI
7th Jul 2025729 PMAQI
7th Jul 20257410 PMAQI
7th Jul 20257511 PMAQI
8th Jul 20257112 AMAQI
8th Jul 2025621 AMAQI
8th Jul 2025552 AMAQI
8th Jul 2025563 AMAQI
29°C26/35°C
8th Jul 2025584 AMAQI
8th Jul 2025645 AMAQI
8th Jul 2025646 AMAQI
8th Jul 2025647 AMAQI
8th Jul 2025648 AMAQI
8th Jul 20251049 AMAQI
8th Jul 202511810 AMAQI
8th Jul 202510911 AMAQI
8th Jul 202510312 PMAQI
8th Jul 2025911 PMAQI
8th Jul 2025842 PMAQI
8th Jul 2025793 PMAQI
8th Jul 2025824 PMAQI
8th Jul 2025845 PMAQI
8th Jul 2025816 PMAQI
8th Jul 2025847 PMAQI
8th Jul 2025808 PMAQI
8th Jul 2025719 PMAQI
8th Jul 20257210 PMAQI
8th Jul 20257411 PMAQI
9th Jul 20257412 AMAQI
9th Jul 2025661 AMAQI
9th Jul 2025632 AMAQI
9th Jul 2025623 AMAQI
30°C26/36°C
9th Jul 2025654 AMAQI
9th Jul 2025705 AMAQI
9th Jul 2025706 AMAQI
9th Jul 2025697 AMAQI
9th Jul 2025708 AMAQI
9th Jul 20251099 AMAQI
9th Jul 202512010 AMAQI
9th Jul 202511811 AMAQI
9th Jul 202511012 PMAQI
9th Jul 20251011 PMAQI
9th Jul 2025952 PMAQI
9th Jul 2025953 PMAQI
9th Jul 20251004 PMAQI
9th Jul 20251005 PMAQI
9th Jul 2025946 PMAQI
9th Jul 2025837 PMAQI
9th Jul 2025728 PMAQI
9th Jul 2025639 PMAQI
9th Jul 20256010 PMAQI
9th Jul 20256011 PMAQI
10th Jul 20256012 AMAQI
10th Jul 2025651 AMAQI
10th Jul 2025662 AMAQI
10th Jul 2025663 AMAQI
30°C26/36°C
10th Jul 2025694 AMAQI
10th Jul 2025745 AMAQI
10th Jul 2025736 AMAQI
10th Jul 2025747 AMAQI
10th Jul 2025728 AMAQI
10th Jul 2025479 AMAQI
10th Jul 20254710 AMAQI
10th Jul 20255711 AMAQI
10th Jul 20256012 PMAQI
10th Jul 2025641 PMAQI
10th Jul 2025622 PMAQI
10th Jul 2025583 PMAQI
10th Jul 2025584 PMAQI
10th Jul 2025535 PMAQI
10th Jul 2025456 PMAQI
10th Jul 2025347 PMAQI
10th Jul 2025428 PMAQI
10th Jul 2025569 PMAQI
10th Jul 20255610 PMAQI
10th Jul 20255611 PMAQI
11th Jul 20255712 AMAQI
11th Jul 2025631 AMAQI
11th Jul 2025652 AMAQI
11th Jul 2025673 AMAQI
27°C22/35°C
11th Jul 2025684 AMAQI
11th Jul 2025665 AMAQI
11th Jul 2025666 AMAQI
11th Jul 2025687 AMAQI
11th Jul 2025678 AMAQI
11th Jul 2025289 AMAQI
11th Jul 20251610 AMAQI
11th Jul 20251811 AMAQI
11th Jul 20251812 PMAQI
11th Jul 2025321 PMAQI
11th Jul 2025302 PMAQI
11th Jul 2025303 PMAQI
11th Jul 2025344 PMAQI
11th Jul 2025325 PMAQI
11th Jul 2025346 PMAQI
11th Jul 2025327 PMAQI
11th Jul 2025428 PMAQI
11th Jul 2025549 PMAQI
11th Jul 20255410 PMAQI
11th Jul 20255511 PMAQI
12th Jul 20255612 AMAQI
12th Jul 2025591 AMAQI
12th Jul 2025642 AMAQI
12th Jul 2025653 AMAQI
22°C21/24°C
12th Jul 2025624 AMAQI
12th Jul 2025595 AMAQI
12th Jul 2025586 AMAQI
12th Jul 2025587 AMAQI
12th Jul 2025588 AMAQI
12th Jul 2025379 AMAQI
12th Jul 20253010 AMAQI
12th Jul 20253411 AMAQI
12th Jul 20253712 PMAQI
12th Jul 2025411 PMAQI
12th Jul 2025432 PMAQI
12th Jul 2025403 PMAQI
12th Jul 2025424 PMAQI
12th Jul 2025375 PMAQI
12th Jul 2025346 PMAQI
12th Jul 2025397 PMAQI
12th Jul 2025448 PMAQI
12th Jul 2025529 PMAQI
12th Jul 20255310 PMAQI
12th Jul 20255211 PMAQI
13th Jul 20255212 AMAQI
13th Jul 2025561 AMAQI
13th Jul 2025592 AMAQI
13th Jul 2025603 AMAQI
23°C20/26°C
13th Jul 2025594 AMAQI
13th Jul 2025575 AMAQI
13th Jul 2025586 AMAQI
13th Jul 2025577 AMAQI
13th Jul 2025578 AMAQI
13th Jul 2025469 AMAQI
13th Jul 20254010 AMAQI
13th Jul 20254411 AMAQI
13th Jul 20254412 PMAQI
13th Jul 2025501 PMAQI
13th Jul 2025492 PMAQI
13th Jul 2025513 PMAQI
13th Jul 2025474 PMAQI
13th Jul 2025495 PMAQI
13th Jul 2025486 PMAQI
13th Jul 2025457 PMAQI
13th Jul 2025458 PMAQI
13th Jul 2025529 PMAQI
13th Jul 20255110 PMAQI
13th Jul 20254811 PMAQI
14th Jul 20254712 AMAQI
14th Jul 2025541 AMAQI
14th Jul 2025552 AMAQI
14th Jul 2025563 AMAQI
25°C21/30°C
14th Jul 2025564 AMAQI
14th Jul 2025555 AMAQI
14th Jul 2025546 AMAQI
14th Jul 2025557 AMAQI
14th Jul 2025558 AMAQI
14th Jul 2025269 AMAQI
14th Jul 20251710 AMAQI
14th Jul 20251611 AMAQI
14th Jul 20251612 PMAQI
14th Jul 2025221 PMAQI
14th Jul 2025212 PMAQI
14th Jul 2025233 PMAQI
14th Jul 2025224 PMAQI
14th Jul 2025225 PMAQI
14th Jul 2025256 PMAQI
14th Jul 2025267 PMAQI
14th Jul 2025328 PMAQI
14th Jul 2025449 PMAQI
14th Jul 20254410 PMAQI
14th Jul 20254411 PMAQI
15th Jul 20254612 AMAQI
15th Jul 2025531 AMAQI
15th Jul 2025542 AMAQI
15th Jul 2025543 AMAQI
25°C23/28°C
15th Jul 2025544 AMAQI
15th Jul 2025525 AMAQI
15th Jul 2025526 AMAQI
15th Jul 2025527 AMAQI
15th Jul 2025528 AMAQI
15th Jul 2025289 AMAQI
15th Jul 20252010 AMAQI
15th Jul 20252411 AMAQI
15th Jul 20252412 PMAQI
15th Jul 2025251 PMAQI
15th Jul 2025212 PMAQI
15th Jul 2025233 PMAQI
15th Jul 2025254 PMAQI
15th Jul 2025265 PMAQI
15th Jul 2025266 PMAQI
15th Jul 2025277 PMAQI
15th Jul 2025328 PMAQI
15th Jul 2025419 PMAQI
15th Jul 20254110 PMAQI
15th Jul 20254011 PMAQI
16th Jul 20254212 AMAQI
16th Jul 2025501 AMAQI
16th Jul 2025522 AMAQI
16th Jul 2025523 AMAQI
26°C25/28°C
16th Jul 2025514 AMAQI
16th Jul 2025485 AMAQI
16th Jul 2025486 AMAQI
16th Jul 2025487 AMAQI
16th Jul 2025488 AMAQI
16th Jul 2025509 AMAQI
16th Jul 20255310 AMAQI
16th Jul 20255111 AMAQI
16th Jul 20254212 PMAQI
16th Jul 2025281 PMAQI
16th Jul 2025262 PMAQI
16th Jul 2025263 PMAQI
16th Jul 2025264 PMAQI
16th Jul 2025265 PMAQI
16th Jul 2025276 PMAQI
16th Jul 2025237 PMAQI
16th Jul 2025268 PMAQI
16th Jul 2025379 PMAQI
16th Jul 20253910 PMAQI
16th Jul 20253811 PMAQI
17th Jul 20254212 AMAQI
17th Jul 2025471 AMAQI
17th Jul 2025482 AMAQI
17th Jul 2025483 AMAQI
27°C24/29°C
17th Jul 2025494 AMAQI
17th Jul 2025475 AMAQI
17th Jul 2025486 AMAQI
17th Jul 2025477 AMAQI
17th Jul 2025478 AMAQI
17th Jul 2025299 AMAQI
17th Jul 20252210 AMAQI
17th Jul 20253011 AMAQI
17th Jul 20253312 PMAQI
17th Jul 2025321 PMAQI
17th Jul 2025332 PMAQI
17th Jul 2025283 PMAQI
17th Jul 2025334 PMAQI
17th Jul 2025345 PMAQI
17th Jul 2025366 PMAQI
17th Jul 2025387 PMAQI
17th Jul 2025408 PMAQI
17th Jul 2025429 PMAQI
17th Jul 20254210 PMAQI
17th Jul 20254211 PMAQI
18th Jul 20254112 AMAQI
18th Jul 2025461 AMAQI
18th Jul 2025472 AMAQI
18th Jul 2025483 AMAQI
28°C25/32°C
18th Jul 2025464 AMAQI
18th Jul 2025445 AMAQI
18th Jul 2025446 AMAQI
18th Jul 2025447 AMAQI
18th Jul 2025438 AMAQI
18th Jul 2025359 AMAQI
18th Jul 20253310 AMAQI
18th Jul 20253311 AMAQI
18th Jul 20253312 PMAQI
18th Jul 2025341 PMAQI
18th Jul 2025322 PMAQI
18th Jul 2025283 PMAQI
18th Jul 2025264 PMAQI
18th Jul 2025225 PMAQI
18th Jul 2025256 PMAQI
18th Jul 2025247 PMAQI
18th Jul 2025308 PMAQI
18th Jul 2025389 PMAQI
18th Jul 20253810 PMAQI
18th Jul 20253811 PMAQI
19th Jul 20253912 AMAQI
19th Jul 2025441 AMAQI
19th Jul 2025462 AMAQI
19th Jul 2025463 AMAQI
28°C24/33°C
19th Jul 2025444 AMAQI
19th Jul 2025425 AMAQI
19th Jul 2025426 AMAQI
19th Jul 2025437 AMAQI
19th Jul 2025428 AMAQI
19th Jul 2025339 AMAQI
19th Jul 20253210 AMAQI
19th Jul 20253111 AMAQI
19th Jul 20253212 PMAQI
19th Jul 2025301 PMAQI
19th Jul 2025302 PMAQI
19th Jul 2025283 PMAQI
19th Jul 2025294 PMAQI
19th Jul 2025255 PMAQI
19th Jul 2025236 PMAQI
19th Jul 2025317 PMAQI
19th Jul 2025308 PMAQI
19th Jul 2025379 PMAQI
19th Jul 20253910 PMAQI
19th Jul 20253511 PMAQI
20th Jul 20253612 AMAQI
20th Jul 2025411 AMAQI
20th Jul 2025432 AMAQI
20th Jul 2025443 AMAQI
28°C23/33°C
20th Jul 2025424 AMAQI
20th Jul 2025415 AMAQI
20th Jul 2025416 AMAQI
20th Jul 2025417 AMAQI
20th Jul 2025418 AMAQI
20th Jul 2025339 AMAQI
20th Jul 20252510 AMAQI
20th Jul 20252811 AMAQI
20th Jul 20253412 PMAQI
20th Jul 2025421 PMAQI
20th Jul 2025412 PMAQI
20th Jul 2025373 PMAQI
20th Jul 2025384 PMAQI
20th Jul 2025365 PMAQI
20th Jul 2025366 PMAQI
20th Jul 2025357 PMAQI
20th Jul 2025328 PMAQI
20th Jul 2025379 PMAQI
20th Jul 20253710 PMAQI
20th Jul 20253711 PMAQI
21st Jul 20253612 AMAQI
21st Jul 2025401 AMAQI
21st Jul 2025412 AMAQI
21st Jul 2025413 AMAQI
29°C25/35°C
21st Jul 2025404 AMAQI
21st Jul 2025395 AMAQI
21st Jul 2025386 AMAQI
21st Jul 2025397 AMAQI
21st Jul 2025388 AMAQI
21st Jul 2025319 AMAQI
21st Jul 20253410 AMAQI
21st Jul 20254511 AMAQI
21st Jul 20255112 PMAQI
21st Jul 2025481 PMAQI
21st Jul 2025462 PMAQI
21st Jul 2025493 PMAQI
21st Jul 2025504 PMAQI
21st Jul 2025505 PMAQI
21st Jul 2025486 PMAQI
21st Jul 2025517 PMAQI
21st Jul 2025448 PMAQI
21st Jul 2025439 PMAQI
21st Jul 20254210 PMAQI
21st Jul 20253811 PMAQI
22nd Jul 20254112 AMAQI
22nd Jul 2025411 AMAQI
22nd Jul 2025402 AMAQI
22nd Jul 2025393 AMAQI
30°C26/37°C
22nd Jul 2025394 AMAQI
22nd Jul 2025405 AMAQI
22nd Jul 2025396 AMAQI
22nd Jul 2025407 AMAQI
22nd Jul 2025408 AMAQI
22nd Jul 2025339 AMAQI
22nd Jul 20253710 AMAQI
22nd Jul 20254411 AMAQI
22nd Jul 20255012 PMAQI
22nd Jul 2025491 PMAQI
22nd Jul 2025502 PMAQI
22nd Jul 2025523 PMAQI
22nd Jul 2025524 PMAQI
22nd Jul 2025535 PMAQI
22nd Jul 2025556 PMAQI
22nd Jul 2025527 PMAQI
22nd Jul 2025478 PMAQI
22nd Jul 2025409 PMAQI
22nd Jul 20254010 PMAQI
22nd Jul 20254011 PMAQI
23rd Jul 20253512 AMAQI
23rd Jul 2025391 AMAQI
23rd Jul 2025402 AMAQI
23rd Jul 2025403 AMAQI
30°C26/37°C
23rd Jul 2025404 AMAQI
23rd Jul 2025405 AMAQI
23rd Jul 2025406 AMAQI
23rd Jul 2025427 AMAQI
23rd Jul 2025418 AMAQI
23rd Jul 2025369 AMAQI
23rd Jul 20254210 AMAQI
23rd Jul 20254411 AMAQI
23rd Jul 20255112 PMAQI
23rd Jul 2025521 PMAQI
23rd Jul 2025552 PMAQI
23rd Jul 2025543 PMAQI
23rd Jul 2025554 PMAQI
23rd Jul 2025565 PMAQI
23rd Jul 2025546 PMAQI
23rd Jul 2025517 PMAQI
23rd Jul 2025508 PMAQI
23rd Jul 2025489 PMAQI
23rd Jul 20254610 PMAQI
23rd Jul 20254811 PMAQI
24th Jul 20254812 AMAQI
24th Jul 2025461 AMAQI
24th Jul 2025402 AMAQI
24th Jul 2025403 AMAQI
30°C25/38°C
24th Jul 2025404 AMAQI
24th Jul 2025425 AMAQI
24th Jul 2025426 AMAQI
24th Jul 2025427 AMAQI
24th Jul 2025428 AMAQI
24th Jul 2025389 AMAQI
24th Jul 20254610 AMAQI
24th Jul 20255511 AMAQI
24th Jul 20255612 PMAQI
24th Jul 2025551 PMAQI
24th Jul 2025552 PMAQI
24th Jul 2025533 PMAQI
24th Jul 2025534 PMAQI
24th Jul 2025535 PMAQI
24th Jul 2025526 PMAQI
24th Jul 2025537 PMAQI
24th Jul 2025518 PMAQI
24th Jul 2025489 PMAQI
24th Jul 20254810 PMAQI
24th Jul 20254711 PMAQI
25th Jul 20254212 AMAQI
25th Jul 2025421 AMAQI
25th Jul 2025432 AMAQI
25th Jul 2025443 AMAQI
31°C25/38°C
25th Jul 2025444 AMAQI
25th Jul 2025465 AMAQI
25th Jul 2025466 AMAQI
25th Jul 2025457 AMAQI
25th Jul 2025468 AMAQI
25th Jul 2025439 AMAQI
25th Jul 20254410 AMAQI
25th Jul 20255211 AMAQI
25th Jul 20255512 PMAQI
25th Jul 2025551 PMAQI
25th Jul 2025572 PMAQI
25th Jul 2025563 PMAQI
25th Jul 2025564 PMAQI
25th Jul 2025565 PMAQI
25th Jul 2025536 PMAQI
25th Jul 2025507 PMAQI
25th Jul 2025498 PMAQI
25th Jul 2025489 PMAQI
25th Jul 20254710 PMAQI
25th Jul 20254211 PMAQI
26th Jul 20254712 AMAQI
26th Jul 2025471 AMAQI
26th Jul 2025462 AMAQI
26th Jul 2025463 AMAQI
31°C26/38°C
26th Jul 2025464 AMAQI
26th Jul 2025485 AMAQI
26th Jul 2025486 AMAQI
26th Jul 2025477 AMAQI
26th Jul 2025488 AMAQI
26th Jul 2025409 AMAQI
26th Jul 20254010 AMAQI
26th Jul 20254511 AMAQI
26th Jul 20255512 PMAQI
26th Jul 2025561 PMAQI
26th Jul 2025562 PMAQI
26th Jul 2025563 PMAQI
26th Jul 2025534 PMAQI
26th Jul 2025575 PMAQI
26th Jul 2025576 PMAQI
26th Jul 2025467 PMAQI
26th Jul 2025468 PMAQI
26th Jul 2025429 PMAQI
26th Jul 20253810 PMAQI
26th Jul 20253811 PMAQI
27th Jul 20253912 AMAQI
27th Jul 2025421 AMAQI
27th Jul 2025462 AMAQI
27th Jul 2025493 AMAQI
31°C26/38°C
27th Jul 2025484 AMAQI
27th Jul 2025485 AMAQI
27th Jul 2025496 AMAQI
27th Jul 2025497 AMAQI
27th Jul 2025498 AMAQI
27th Jul 2025449 AMAQI
27th Jul 20254310 AMAQI
27th Jul 20254711 AMAQI
27th Jul 20255012 PMAQI
27th Jul 2025511 PMAQI
27th Jul 2025502 PMAQI
27th Jul 2025443 PMAQI
27th Jul 2025514 PMAQI
27th Jul 2025545 PMAQI
27th Jul 2025466 PMAQI
27th Jul 2025427 PMAQI
27th Jul 2025408 PMAQI
27th Jul 2025409 PMAQI
27th Jul 20253810 PMAQI
27th Jul 20253411 PMAQI
28th Jul 20253612 AMAQI
28th Jul 2025411 AMAQI
28th Jul 2025472 AMAQI
28th Jul 2025483 AMAQI
31°C26/38°C
28th Jul 2025484 AMAQI
28th Jul 2025475 AMAQI
28th Jul 2025466 AMAQI
28th Jul 2025477 AMAQI
28th Jul 2025468 AMAQI
28th Jul 2025349 AMAQI
28th Jul 20253510 AMAQI
28th Jul 20253811 AMAQI
28th Jul 20254412 PMAQI
28th Jul 2025441 PMAQI
28th Jul 2025372 PMAQI
28th Jul 2025403 PMAQI
28th Jul 2025454 PMAQI
28th Jul 2025475 PMAQI
28th Jul 2025496 PMAQI
28th Jul 2025477 PMAQI
28th Jul 2025478 PMAQI
28th Jul 2025509 PMAQI
28th Jul 20254810 PMAQI
28th Jul 20255011 PMAQI
29th Jul 20255012 AMAQI
29th Jul 2025491 AMAQI
29th Jul 2025482 AMAQI
29th Jul 2025443 AMAQI
32°C26/39°C
29th Jul 2025444 AMAQI
29th Jul 2025445 AMAQI
29th Jul 2025456 AMAQI
29th Jul 2025457 AMAQI
29th Jul 2025458 AMAQI
29th Jul 2025449 AMAQI
29th Jul 20254410 AMAQI
29th Jul 20255111 AMAQI
29th Jul 20255412 PMAQI
29th Jul 2025521 PMAQI
29th Jul 2025532 PMAQI
29th Jul 2025523 PMAQI
29th Jul 2025484 PMAQI
29th Jul 2025425 PMAQI
29th Jul 2025346 PMAQI
29th Jul 2025287 PMAQI
29th Jul 2025288 PMAQI
29th Jul 2025369 PMAQI
29th Jul 20253310 PMAQI
29th Jul 20253211 PMAQI
30th Jul 20253312 AMAQI
30th Jul 2025351 AMAQI
30th Jul 2025442 AMAQI
30th Jul 2025463 AMAQI
31°C26/38°C
30th Jul 2025484 AMAQI
30th Jul 2025485 AMAQI
30th Jul 2025496 AMAQI
30th Jul 2025487 AMAQI
30th Jul 2025488 AMAQI
30th Jul 2025269 AMAQI
30th Jul 20252210 AMAQI
30th Jul 20252411 AMAQI
30th Jul 20252412 PMAQI
30th Jul 2025241 PMAQI
30th Jul 2025222 PMAQI
30th Jul 2025253 PMAQI
30th Jul 2025264 PMAQI
30th Jul 2025315 PMAQI
30th Jul 2025326 PMAQI
30th Jul 2025327 PMAQI
30th Jul 2025368 PMAQI
30th Jul 2025389 PMAQI
30th Jul 20253810 PMAQI
30th Jul 20253811 PMAQI
31st Jul 20254112 AMAQI
31st Jul 2025461 AMAQI
31st Jul 2025462 AMAQI
31st Jul 2025443 AMAQI
29°C25/36°C
31st Jul 2025434 AMAQI
31st Jul 2025435 AMAQI
31st Jul 2025436 AMAQI
31st Jul 2025437 AMAQI
31st Jul 2025438 AMAQI
31st Jul 2025439 AMAQI
31st Jul 20254310 AMAQI
31st Jul 20253811 AMAQI
31st Jul 20253612 PMAQI
31st Jul 2025321 PMAQI
31st Jul 2025262 PMAQI
31st Jul 2025223 PMAQI
31st Jul 2025254 PMAQI
31st Jul 2025285 PMAQI
31st Jul 2025286 PMAQI
31st Jul 2025287 PMAQI
31st Jul 2025308 PMAQI
31st Jul 2025309 PMAQI
31st Jul 20253310 PMAQI
31st Jul 20252811 PMAQI
1st Aug 20253012 AMAQI
1st Aug 2025341 AMAQI
1st Aug 2025332 AMAQI
1st Aug 2025383 AMAQI
28°C24/34°C
1st Aug 2025374 AMAQI
1st Aug 2025365 AMAQI
1st Aug 2025366 AMAQI
1st Aug 2025377 AMAQI
1st Aug 2025388 AMAQI
1st Aug 2025379 AMAQI
1st Aug 20253410 AMAQI
1st Aug 20253911 AMAQI
1st Aug 20254012 PMAQI
1st Aug 2025401 PMAQI
1st Aug 2025322 PMAQI
1st Aug 2025283 PMAQI
1st Aug 2025424 PMAQI
1st Aug 2025345 PMAQI
1st Aug 2025396 PMAQI
1st Aug 2025287 PMAQI
1st Aug 2025298 PMAQI
1st Aug 2025299 PMAQI
1st Aug 20253210 PMAQI
1st Aug 20252811 PMAQI
2nd Aug 20252812 AMAQI
2nd Aug 2025361 AMAQI
2nd Aug 2025382 AMAQI
2nd Aug 2025393 AMAQI
27°C24/32°C
2nd Aug 2025404 AMAQI
2nd Aug 2025385 AMAQI
2nd Aug 2025406 AMAQI
2nd Aug 2025387 AMAQI
2nd Aug 2025398 AMAQI
2nd Aug 2025319 AMAQI
2nd Aug 20253410 AMAQI
2nd Aug 20254311 AMAQI
2nd Aug 20252812 PMAQI
2nd Aug 2025361 PMAQI
2nd Aug 2025482 PMAQI
2nd Aug 2025503 PMAQI
2nd Aug 2025394 PMAQI
2nd Aug 2025415 PMAQI
2nd Aug 2025406 PMAQI
2nd Aug 2025507 PMAQI
2nd Aug 2025388 PMAQI
2nd Aug 2025389 PMAQI
2nd Aug 20253510 PMAQI
2nd Aug 20254111 PMAQI
3rd Aug 20253212 AMAQI
3rd Aug 2025351 AMAQI
3rd Aug 2025382 AMAQI
3rd Aug 2025383 AMAQI
31°C26/37°C
3rd Aug 2025404 AMAQI
3rd Aug 2025395 AMAQI
3rd Aug 2025386 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025398 AMAQI
3rd Aug 2025449 AMAQI
3rd Aug 20255010 AMAQI
3rd Aug 20254611 AMAQI
3rd Aug 20255612 PMAQI
3rd Aug 2025481 PMAQI
3rd Aug 2025552 PMAQI
3rd Aug 2025463 PMAQI
3rd Aug 2025454 PMAQI
3rd Aug 2025465 PMAQI
3rd Aug 2025506 PMAQI
3rd Aug 2025467 PMAQI
3rd Aug 2025458 PMAQI
3rd Aug 2025389 PMAQI
3rd Aug 20253810 PMAQI
3rd Aug 20253811 PMAQI
4th Aug 20253612 AMAQI
4th Aug 2025371 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025403 AMAQI
31°C26/37°C
4th Aug 2025414 AMAQI
4th Aug 2025425 AMAQI
4th Aug 2025426 AMAQI
4th Aug 2025427 AMAQI
4th Aug 2025438 AMAQI
4th Aug 2025529 AMAQI
4th Aug 20255910 AMAQI
4th Aug 20256711 AMAQI
4th Aug 20257412 PMAQI
4th Aug 2025701 PMAQI
4th Aug 2025762 PMAQI
4th Aug 2025703 PMAQI
4th Aug 2025814 PMAQI
4th Aug 2025845 PMAQI
4th Aug 2025726 PMAQI
4th Aug 2025707 PMAQI
4th Aug 2025628 PMAQI
4th Aug 2025579 PMAQI
4th Aug 20255410 PMAQI
4th Aug 20254711 PMAQI
5th Aug 20255112 AMAQI
5th Aug 2025411 AMAQI
5th Aug 2025402 AMAQI
5th Aug 2025403 AMAQI
31°C26/38°C
5th Aug 2025494 AMAQI
5th Aug 2025515 AMAQI
5th Aug 2025516 AMAQI
5th Aug 2025497 AMAQI
5th Aug 2025528 AMAQI
5th Aug 2025549 AMAQI
5th Aug 20255610 AMAQI
5th Aug 20255711 AMAQI
5th Aug 20256612 PMAQI
5th Aug 2025541 PMAQI
5th Aug 2025532 PMAQI
5th Aug 2025523 PMAQI
5th Aug 2025584 PMAQI
5th Aug 2025495 PMAQI
5th Aug 2025526 PMAQI
5th Aug 2025397 PMAQI
5th Aug 2025468 PMAQI
5th Aug 2025459 PMAQI
5th Aug 20254410 PMAQI
5th Aug 20254011 PMAQI
6th Aug 20254312 AMAQI
6th Aug 2025471 AMAQI
6th Aug 2025502 AMAQI
6th Aug 2025483 AMAQI
--°C/°C
6th Aug 2025504 AMAQI
4 AM6th Aug 2025525 AMAQI
6th Aug 2025506 AMAQI
6th Aug 2025517 AMAQI
6th Aug 2025508 AMAQI
11 AM
6 PM
11 PM
3 AM
--°C/°C
Day time
Avg. Highest Time
11 AM - 6 PM
48AQI
8 hours / Day
240 hours / Month
Avg. Lowest Time
9 AM - 10 AM
45AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 6 PM (Avg. 48), while the lowest AQI was between 9 AM to 10 AM (Avg. 45).
Night time
Avg. Highest Time
12 AM - 3 AM
47AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
7 PM - 11 PM
45AQI
5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 3 AM (Avg. 47), while the lowest AQI was between 7 PM to 11 PM (Avg. 45).
2025 Days Vs Air Quality
Ko, Chikusei, Ibaraki, Japan
2025
92%
199
8%
18
Total number of days with different AQI categories in last 217 days in 2025 (148 days remaining)
Good
199 DaysModerate
18 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 217 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
Ko, Chikusei, Ibaraki, 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
32AQI
32AQI
2nd January 2025
35AQI
35AQI
3rd January 2025
26AQI
26AQI
4th January 2025
27AQI
27AQI
5th January 2025
34AQI
34AQI
6th January 2025
57AQI
57AQI
7th January 2025
35AQI
35AQI
8th January 2025
37AQI
37AQI
9th January 2025
28AQI
28AQI
10th January 2025
30AQI
30AQI
11th January 2025
28AQI
28AQI
12th January 2025
38AQI
38AQI
13th January 2025
30AQI
30AQI
14th January 2025
39AQI
39AQI
15th January 2025
35AQI
35AQI
16th January 2025
34AQI
34AQI
17th January 2025
31AQI
31AQI
18th January 2025
35AQI
35AQI
19th January 2025
59AQI
59AQI
20th January 2025
42AQI
42AQI
21st January 2025
48AQI
48AQI
22nd January 2025
40AQI
40AQI
23rd January 2025
48AQI
48AQI
24th January 2025
46AQI
46AQI
25th January 2025
39AQI
39AQI
26th January 2025
35AQI
35AQI
27th January 2025
36AQI
36AQI
28th January 2025
40AQI
40AQI
29th January 2025
31AQI
31AQI
30th January 2025
32AQI
32AQI
31st January 2025
29AQI
29AQI
1st February 2025
35AQI
35AQI
2nd February 2025
34AQI
34AQI
3rd February 2025
39AQI
39AQI
4th February 2025
31AQI
31AQI
5th February 2025
34AQI
34AQI
6th February 2025
28AQI
28AQI
7th February 2025
30AQI
30AQI
8th February 2025
30AQI
30AQI
9th February 2025
30AQI
30AQI
10th February 2025
30AQI
30AQI
11th February 2025
30AQI
30AQI
12th February 2025
40AQI
40AQI
13th February 2025
38AQI
38AQI
14th February 2025
34AQI
34AQI
15th February 2025
33AQI
33AQI
16th February 2025
38AQI
38AQI
17th February 2025
36AQI
36AQI
18th February 2025
32AQI
32AQI
19th February 2025
31AQI
31AQI
20th February 2025
31AQI
31AQI
21st February 2025
31AQI
31AQI
22nd February 2025
31AQI
31AQI
23rd February 2025
32AQI
32AQI
24th February 2025
32AQI
32AQI
25th February 2025
34AQI
34AQI
26th February 2025
38AQI
38AQI
27th February 2025
40AQI
40AQI
28th February 2025
50AQI
50AQI
1st March 2025
49AQI
49AQI
2nd March 2025
59AQI
59AQI
3rd March 2025
39AQI
39AQI
4th March 2025
38AQI
38AQI
5th March 2025
26AQI
26AQI
6th March 2025
33AQI
33AQI
7th March 2025
31AQI
31AQI
8th March 2025
37AQI
37AQI
9th March 2025
35AQI
35AQI
10th March 2025
37AQI
37AQI
11th March 2025
45AQI
45AQI
12th March 2025
47AQI
47AQI
13th March 2025
45AQI
45AQI
14th March 2025
37AQI
37AQI
15th March 2025
39AQI
39AQI
16th March 2025
24AQI
24AQI
17th March 2025
23AQI
23AQI
18th March 2025
24AQI
24AQI
19th March 2025
19AQI
19AQI
20th March 2025
26AQI
26AQI
21st March 2025
40AQI
40AQI
22nd March 2025
49AQI
49AQI
23rd March 2025
51AQI
51AQI
24th March 2025
50AQI
50AQI
25th March 2025
67AQI
67AQI
26th March 2025
63AQI
63AQI
27th March 2025
66AQI
66AQI
28th March 2025
49AQI
49AQI
29th March 2025
38AQI
38AQI
30th March 2025
33AQI
33AQI
31st March 2025
31AQI
31AQI
1st April 2025
26AQI
26AQI
2nd April 2025
22AQI
22AQI
3rd April 2025
20AQI
20AQI
4th April 2025
24AQI
24AQI
5th April 2025
24AQI
24AQI
6th April 2025
20AQI
20AQI
7th April 2025
25AQI
25AQI
8th April 2025
32AQI
32AQI
9th April 2025
23AQI
23AQI
10th April 2025
39AQI
39AQI
11th April 2025
35AQI
35AQI
12th April 2025
29AQI
29AQI
13th April 2025
23AQI
23AQI
14th April 2025
26AQI
26AQI
15th April 2025
22AQI
22AQI
16th April 2025
20AQI
20AQI
17th April 2025
37AQI
37AQI
18th April 2025
46AQI
46AQI
19th April 2025
55AQI
55AQI
20th April 2025
45AQI
45AQI
21st April 2025
38AQI
38AQI
22nd April 2025
42AQI
42AQI
23rd April 2025
23AQI
23AQI
24th April 2025
33AQI
33AQI
25th April 2025
29AQI
29AQI
26th April 2025
40AQI
40AQI
27th April 2025
39AQI
39AQI
28th April 2025
44AQI
44AQI
29th April 2025
27AQI
27AQI
30th April 2025
34AQI
34AQI
1st May 2025
30AQI
30AQI
2nd May 2025
25AQI
25AQI
3rd May 2025
27AQI
27AQI
4th May 2025
30AQI
30AQI
5th May 2025
28AQI
28AQI
6th May 2025
22AQI
22AQI
7th May 2025
21AQI
21AQI
8th May 2025
24AQI
24AQI
9th May 2025
25AQI
25AQI
10th May 2025
19AQI
19AQI
11th May 2025
22AQI
22AQI
12th May 2025
18AQI
18AQI
13th May 2025
30AQI
30AQI
14th May 2025
32AQI
32AQI
15th May 2025
34AQI
34AQI
16th May 2025
40AQI
40AQI
17th May 2025
24AQI
24AQI
18th May 2025
40AQI
40AQI
19th May 2025
34AQI
34AQI
20th May 2025
52AQI
52AQI
21st May 2025
48AQI
48AQI
22nd May 2025
44AQI
44AQI
23rd May 2025
42AQI
42AQI
24th May 2025
35AQI
35AQI
25th May 2025
27AQI
27AQI
26th May 2025
26AQI
26AQI
27th May 2025
23AQI
23AQI
28th May 2025
22AQI
22AQI
29th May 2025
25AQI
25AQI
30th May 2025
20AQI
20AQI
31st May 2025
16AQI
16AQI
1st June 2025
18AQI
18AQI
2nd June 2025
27AQI
27AQI
3rd June 2025
28AQI
28AQI
4th June 2025
24AQI
24AQI
5th June 2025
31AQI
31AQI
6th June 2025
42AQI
42AQI
7th June 2025
46AQI
46AQI
8th June 2025
55AQI
55AQI
9th June 2025
45AQI
45AQI
10th June 2025
35AQI
35AQI
11th June 2025
30AQI
30AQI
12th June 2025
38AQI
38AQI
13th June 2025
31AQI
31AQI
14th June 2025
31AQI
31AQI
15th June 2025
29AQI
29AQI
16th June 2025
33AQI
33AQI
17th June 2025
40AQI
40AQI
18th June 2025
40AQI
40AQI
19th June 2025
41AQI
41AQI
20th June 2025
39AQI
39AQI
21st June 2025
35AQI
35AQI
22nd June 2025
30AQI
30AQI
23rd June 2025
30AQI
30AQI
24th June 2025
32AQI
32AQI
25th June 2025
25AQI
25AQI
26th June 2025
28AQI
28AQI
27th June 2025
33AQI
33AQI
28th June 2025
34AQI
34AQI
29th June 2025
41AQI
41AQI
30th June 2025
45AQI
45AQI
1st July 2025
44AQI
44AQI
2nd July 2025
47AQI
47AQI
3rd July 2025
48AQI
48AQI
4th July 2025
50AQI
50AQI
5th July 2025
53AQI
53AQI
6th July 2025
62AQI
62AQI
7th July 2025
76AQI
76AQI
8th July 2025
77AQI
77AQI
9th July 2025
80AQI
80AQI
10th July 2025
59AQI
59AQI
11th July 2025
47AQI
47AQI
12th July 2025
49AQI
49AQI
13th July 2025
51AQI
51AQI
14th July 2025
38AQI
38AQI
15th July 2025
38AQI
38AQI
16th July 2025
40AQI
40AQI
17th July 2025
40AQI
40AQI
18th July 2025
37AQI
37AQI
19th July 2025
36AQI
36AQI
20th July 2025
37AQI
37AQI
21st July 2025
43AQI
43AQI
22nd July 2025
44AQI
44AQI
23rd July 2025
46AQI
46AQI
24th July 2025
48AQI
48AQI
25th July 2025
48AQI
48AQI
26th July 2025
48AQI
48AQI
27th July 2025
45AQI
45AQI
28th July 2025
45AQI
45AQI
29th July 2025
43AQI
43AQI
30th July 2025
36AQI
36AQI
31st July 2025
36AQI
36AQI
1st August 2025
34AQI
34AQI
2nd August 2025
39AQI
39AQI
3rd August 2025
43AQI
43AQI
4th August 2025
56AQI
56AQI
5th August 2025
49AQI
49AQI
37AQI
34AQI
40AQI
31AQI
29AQI
35AQI
48AQI
44AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202537AQI
29
2
28
26
5
29
1
30
1
29
1
24
7
4
1
199
18
Highest AQI recorded in
July48AQI
Lowest AQI recorded in
May29AQI
202440AQI
16
2
5
2
1
12
29
1
19
12
31
12
17
27
4
27
3
31
213
38
Highest AQI recorded in
September54AQI
Lowest AQI recorded in
August33AQI
202347AQI
13
6
1
16
9
2
1
18
13
2
3
3
28
3
80
34
3
1
Highest AQI recorded in
February59AQI
Lowest AQI recorded in
November21AQI
202244AQI
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 recorded in
August53AQI
Lowest AQI recorded in
September40AQI
202140AQI
26
5
20
8
25
5
26
4
25
6
23
7
30
1
26
5
27
3
28
3
25
5
23
8
304
60
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
April37AQI
202040AQI
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 recorded in
December51AQI
Lowest AQI recorded in
September32AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2023(Avg.)
47AQILeast Polluted Year Recorded
2025(Avg.)
37AQIKo's annual 2025 AQI (37) shows an average percentage change of -12.7% (improved AQI) compared to previous years: 2020 (40), 2021 (40), 2022 (44), 2023 (47), 2024 (40).
