Koga, 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
Koga, Ibaraki, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
28th Aug 2021
70AQILowest AQI recorded on
30th Aug 2024
11AQISame Day Analysis (3rd August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 43 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 4th Aug - 5th Aug 2025
Koga, Ibaraki, Japan
AQI
Day
Night
.
4 AM4th Aug 2025
6 PM
3 AM5th Aug 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
5PM4th Aug
88AQI
Avg. Lowest Time
3AM5th Aug
40AQI
In the last 24 hours,
Koga's AQI reached its highest point of 88 at 5 PM during the Night, while the lowest point, 40, was recorded at 3 AM during the Night between 4th Aug and 5th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Koga, Ibaraki, Japan
JulAug
06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th
Day
Night
6th Jul 2025484 AMAQI
6th Jul 2025505 AMAQI
6th Jul 2025506 AMAQI
6th Jul 2025497 AMAQI
6th Jul 2025518 AMAQI
6th Jul 2025519 AMAQI
6th Jul 20255610 AMAQI
6th Jul 20255811 AMAQI
6th Jul 20256012 PMAQI
6th Jul 2025581 PMAQI
6th Jul 2025592 PMAQI
6th Jul 2025613 PMAQI
6th Jul 2025664 PMAQI
6th Jul 2025675 PMAQI
6th Jul 2025736 PMAQI
6th Jul 2025797 PMAQI
6th Jul 2025788 PMAQI
6th Jul 2025669 PMAQI
6th Jul 20256810 PMAQI
6th Jul 20257011 PMAQI
7th Jul 20256812 AMAQI
7th Jul 2025591 AMAQI
7th Jul 2025512 AMAQI
7th Jul 2025513 AMAQI
31°C26/36°C
7th Jul 2025524 AMAQI
7th Jul 2025535 AMAQI
7th Jul 2025526 AMAQI
7th Jul 2025537 AMAQI
7th Jul 2025538 AMAQI
7th Jul 2025959 AMAQI
7th Jul 202511110 AMAQI
7th Jul 202510811 AMAQI
7th Jul 202510012 PMAQI
7th Jul 2025911 PMAQI
7th Jul 2025822 PMAQI
7th Jul 2025783 PMAQI
7th Jul 2025764 PMAQI
7th Jul 2025775 PMAQI
7th Jul 2025796 PMAQI
7th Jul 2025817 PMAQI
7th Jul 2025798 PMAQI
7th Jul 2025759 PMAQI
7th Jul 20257610 PMAQI
7th Jul 20257411 PMAQI
8th Jul 20256912 AMAQI
8th Jul 2025611 AMAQI
8th Jul 2025552 AMAQI
8th Jul 2025553 AMAQI
31°C28/36°C
8th Jul 2025584 AMAQI
8th Jul 2025635 AMAQI
8th Jul 2025636 AMAQI
8th Jul 2025647 AMAQI
8th Jul 2025638 AMAQI
8th Jul 2025919 AMAQI
8th Jul 202510110 AMAQI
8th Jul 202510411 AMAQI
8th Jul 20259612 PMAQI
8th Jul 2025881 PMAQI
8th Jul 2025862 PMAQI
8th Jul 2025823 PMAQI
8th Jul 2025804 PMAQI
8th Jul 2025795 PMAQI
8th Jul 2025776 PMAQI
8th Jul 2025787 PMAQI
8th Jul 2025738 PMAQI
8th Jul 2025679 PMAQI
8th Jul 20257010 PMAQI
8th Jul 20257211 PMAQI
9th Jul 20257312 AMAQI
9th Jul 2025661 AMAQI
9th Jul 2025622 AMAQI
9th Jul 2025623 AMAQI
32°C28/37°C
9th Jul 2025644 AMAQI
9th Jul 2025695 AMAQI
9th Jul 2025696 AMAQI
9th Jul 2025697 AMAQI
9th Jul 2025698 AMAQI
9th Jul 2025839 AMAQI
9th Jul 20258710 AMAQI
9th Jul 20258811 AMAQI
9th Jul 20258812 PMAQI
9th Jul 2025891 PMAQI
9th Jul 2025922 PMAQI
9th Jul 2025913 PMAQI
9th Jul 2025904 PMAQI
9th Jul 2025875 PMAQI
9th Jul 2025886 PMAQI
9th Jul 2025877 PMAQI
9th Jul 2025808 PMAQI
9th Jul 2025639 PMAQI
9th Jul 20255810 PMAQI
9th Jul 20255711 PMAQI
10th Jul 20255912 AMAQI
10th Jul 2025651 AMAQI
10th Jul 2025672 AMAQI
10th Jul 2025673 AMAQI
32°C28/37°C
10th Jul 2025684 AMAQI
10th Jul 2025725 AMAQI
10th Jul 2025736 AMAQI
10th Jul 2025717 AMAQI
10th Jul 2025728 AMAQI
10th Jul 2025469 AMAQI
10th Jul 20254810 AMAQI
10th Jul 20255811 AMAQI
10th Jul 20256712 PMAQI
10th Jul 2025721 PMAQI
10th Jul 2025682 PMAQI
10th Jul 2025603 PMAQI
10th Jul 2025524 PMAQI
10th Jul 2025445 PMAQI
10th Jul 2025406 PMAQI
10th Jul 2025387 PMAQI
10th Jul 2025388 PMAQI
10th Jul 2025559 PMAQI
10th Jul 20255610 PMAQI
10th Jul 20255711 PMAQI
11th Jul 20255712 AMAQI
11th Jul 2025641 AMAQI
11th Jul 2025672 AMAQI
11th Jul 2025683 AMAQI
29°C23/37°C
11th Jul 2025684 AMAQI
11th Jul 2025675 AMAQI
11th Jul 2025666 AMAQI
11th Jul 2025677 AMAQI
11th Jul 2025678 AMAQI
11th Jul 2025309 AMAQI
11th Jul 20251810 AMAQI
11th Jul 20251611 AMAQI
11th Jul 20251912 PMAQI
11th Jul 2025251 PMAQI
11th Jul 2025242 PMAQI
11th Jul 2025243 PMAQI
11th Jul 2025294 PMAQI
11th Jul 2025305 PMAQI
11th Jul 2025276 PMAQI
11th Jul 2025277 PMAQI
11th Jul 2025358 PMAQI
11th Jul 2025539 PMAQI
11th Jul 20255410 PMAQI
11th Jul 20255411 PMAQI
12th Jul 20255512 AMAQI
12th Jul 2025601 AMAQI
12th Jul 2025652 AMAQI
12th Jul 2025663 AMAQI
23°C22/25°C
12th Jul 2025644 AMAQI
12th Jul 2025605 AMAQI
12th Jul 2025596 AMAQI
12th Jul 2025607 AMAQI
12th Jul 2025608 AMAQI
12th Jul 2025369 AMAQI
12th Jul 20252910 AMAQI
12th Jul 20253411 AMAQI
12th Jul 20253512 PMAQI
12th Jul 2025381 PMAQI
12th Jul 2025432 PMAQI
12th Jul 2025443 PMAQI
12th Jul 2025444 PMAQI
12th Jul 2025365 PMAQI
12th Jul 2025306 PMAQI
12th Jul 2025317 PMAQI
12th Jul 2025358 PMAQI
12th Jul 2025519 PMAQI
12th Jul 20255110 PMAQI
12th Jul 20255211 PMAQI
13th Jul 20255312 AMAQI
13th Jul 2025581 AMAQI
13th Jul 2025602 AMAQI
13th Jul 2025613 AMAQI
24°C21/28°C
13th Jul 2025604 AMAQI
13th Jul 2025585 AMAQI
13th Jul 2025586 AMAQI
13th Jul 2025587 AMAQI
13th Jul 2025588 AMAQI
13th Jul 2025449 AMAQI
13th Jul 20253810 AMAQI
13th Jul 20254311 AMAQI
13th Jul 20254912 PMAQI
13th Jul 2025521 PMAQI
13th Jul 2025502 PMAQI
13th Jul 2025463 PMAQI
13th Jul 2025444 PMAQI
13th Jul 2025455 PMAQI
13th Jul 2025456 PMAQI
13th Jul 2025397 PMAQI
13th Jul 2025398 PMAQI
13th Jul 2025509 PMAQI
13th Jul 20254510 PMAQI
13th Jul 20254311 PMAQI
14th Jul 20254712 AMAQI
14th Jul 2025551 AMAQI
14th Jul 2025582 AMAQI
14th Jul 2025583 AMAQI
27°C23/32°C
14th Jul 2025584 AMAQI
14th Jul 2025565 AMAQI
14th Jul 2025566 AMAQI
14th Jul 2025567 AMAQI
14th Jul 2025568 AMAQI
14th Jul 2025309 AMAQI
14th Jul 20251910 AMAQI
14th Jul 20252311 AMAQI
14th Jul 20251612 PMAQI
14th Jul 2025251 PMAQI
14th Jul 2025272 PMAQI
14th Jul 2025253 PMAQI
14th Jul 2025244 PMAQI
14th Jul 2025255 PMAQI
14th Jul 2025256 PMAQI
14th Jul 2025307 PMAQI
14th Jul 2025408 PMAQI
14th Jul 2025469 PMAQI
14th Jul 20254610 PMAQI
14th Jul 20254811 PMAQI
15th Jul 20254712 AMAQI
15th Jul 2025531 AMAQI
15th Jul 2025552 AMAQI
15th Jul 2025563 AMAQI
25°C24/28°C
15th Jul 2025554 AMAQI
15th Jul 2025535 AMAQI
15th Jul 2025536 AMAQI
15th Jul 2025537 AMAQI
15th Jul 2025538 AMAQI
15th Jul 2025249 AMAQI
15th Jul 20251810 AMAQI
15th Jul 20252011 AMAQI
15th Jul 20251912 PMAQI
15th Jul 2025241 PMAQI
15th Jul 2025232 PMAQI
15th Jul 2025223 PMAQI
15th Jul 2025224 PMAQI
15th Jul 2025215 PMAQI
15th Jul 2025206 PMAQI
15th Jul 2025227 PMAQI
15th Jul 2025268 PMAQI
15th Jul 2025399 PMAQI
15th Jul 20254110 PMAQI
15th Jul 20254011 PMAQI
16th Jul 20254212 AMAQI
16th Jul 2025501 AMAQI
16th Jul 2025542 AMAQI
16th Jul 2025543 AMAQI
27°C26/31°C
16th Jul 2025534 AMAQI
16th Jul 2025505 AMAQI
16th Jul 2025506 AMAQI
16th Jul 2025507 AMAQI
16th Jul 2025508 AMAQI
16th Jul 2025519 AMAQI
16th Jul 20254610 AMAQI
16th Jul 20253711 AMAQI
16th Jul 20253012 PMAQI
16th Jul 2025291 PMAQI
16th Jul 2025262 PMAQI
16th Jul 2025223 PMAQI
16th Jul 2025224 PMAQI
16th Jul 2025215 PMAQI
16th Jul 2025216 PMAQI
16th Jul 2025197 PMAQI
16th Jul 2025238 PMAQI
16th Jul 2025379 PMAQI
16th Jul 20253710 PMAQI
16th Jul 20253711 PMAQI
17th Jul 20253812 AMAQI
17th Jul 2025481 AMAQI
17th Jul 2025512 AMAQI
17th Jul 2025513 AMAQI
28°C25/31°C
17th Jul 2025504 AMAQI
17th Jul 2025495 AMAQI
17th Jul 2025496 AMAQI
17th Jul 2025487 AMAQI
17th Jul 2025498 AMAQI
17th Jul 2025289 AMAQI
17th Jul 20252210 AMAQI
17th Jul 20252611 AMAQI
17th Jul 20252812 PMAQI
17th Jul 2025261 PMAQI
17th Jul 2025242 PMAQI
17th Jul 2025223 PMAQI
17th Jul 2025234 PMAQI
17th Jul 2025245 PMAQI
17th Jul 2025296 PMAQI
17th Jul 2025427 PMAQI
17th Jul 2025398 PMAQI
17th Jul 2025419 PMAQI
17th Jul 20254010 PMAQI
17th Jul 20253711 PMAQI
18th Jul 20253712 AMAQI
18th Jul 2025461 AMAQI
18th Jul 2025492 AMAQI
18th Jul 2025493 AMAQI
29°C27/33°C
18th Jul 2025484 AMAQI
18th Jul 2025445 AMAQI
18th Jul 2025446 AMAQI
18th Jul 2025447 AMAQI
18th Jul 2025448 AMAQI
18th Jul 2025319 AMAQI
18th Jul 20252910 AMAQI
18th Jul 20252911 AMAQI
18th Jul 20252812 PMAQI
18th Jul 2025241 PMAQI
18th Jul 2025222 PMAQI
18th Jul 2025203 PMAQI
18th Jul 2025214 PMAQI
18th Jul 2025235 PMAQI
18th Jul 2025236 PMAQI
18th Jul 2025237 PMAQI
18th Jul 2025268 PMAQI
18th Jul 2025339 PMAQI
18th Jul 20253510 PMAQI
18th Jul 20253811 PMAQI
19th Jul 20253912 AMAQI
19th Jul 2025431 AMAQI
19th Jul 2025462 AMAQI
19th Jul 2025463 AMAQI
29°C26/34°C
19th Jul 2025454 AMAQI
19th Jul 2025425 AMAQI
19th Jul 2025426 AMAQI
19th Jul 2025427 AMAQI
19th Jul 2025428 AMAQI
19th Jul 2025319 AMAQI
19th Jul 20253010 AMAQI
19th Jul 20253011 AMAQI
19th Jul 20252112 PMAQI
19th Jul 2025191 PMAQI
19th Jul 2025202 PMAQI
19th Jul 2025193 PMAQI
19th Jul 2025214 PMAQI
19th Jul 2025225 PMAQI
19th Jul 2025226 PMAQI
19th Jul 2025267 PMAQI
19th Jul 2025328 PMAQI
19th Jul 2025389 PMAQI
19th Jul 20253810 PMAQI
19th Jul 20253211 PMAQI
20th Jul 20253312 AMAQI
20th Jul 2025391 AMAQI
20th Jul 2025442 AMAQI
20th Jul 2025443 AMAQI
29°C25/34°C
20th Jul 2025424 AMAQI
20th Jul 2025415 AMAQI
20th Jul 2025406 AMAQI
20th Jul 2025407 AMAQI
20th Jul 2025418 AMAQI
20th Jul 2025309 AMAQI
20th Jul 20252210 AMAQI
20th Jul 20252411 AMAQI
20th Jul 20252512 PMAQI
20th Jul 2025261 PMAQI
20th Jul 2025262 PMAQI
20th Jul 2025263 PMAQI
20th Jul 2025294 PMAQI
20th Jul 2025295 PMAQI
20th Jul 2025266 PMAQI
20th Jul 2025297 PMAQI
20th Jul 2025338 PMAQI
20th Jul 2025339 PMAQI
20th Jul 20253210 PMAQI
20th Jul 20253111 PMAQI
21st Jul 20253012 AMAQI
21st Jul 2025381 AMAQI
21st Jul 2025412 AMAQI
21st Jul 2025413 AMAQI
30°C26/36°C
21st Jul 2025404 AMAQI
21st Jul 2025385 AMAQI
21st Jul 2025386 AMAQI
21st Jul 2025377 AMAQI
21st Jul 2025378 AMAQI
21st Jul 2025269 AMAQI
21st Jul 20252910 AMAQI
21st Jul 20253611 AMAQI
21st Jul 20253812 PMAQI
21st Jul 2025371 PMAQI
21st Jul 2025372 PMAQI
21st Jul 2025403 PMAQI
21st Jul 2025404 PMAQI
21st Jul 2025435 PMAQI
21st Jul 2025426 PMAQI
21st Jul 2025407 PMAQI
21st Jul 2025408 PMAQI
21st Jul 2025489 PMAQI
21st Jul 20253910 PMAQI
21st Jul 20253211 PMAQI
22nd Jul 20253012 AMAQI
22nd Jul 2025361 AMAQI
22nd Jul 2025382 AMAQI
22nd Jul 2025383 AMAQI
32°C27/38°C
22nd Jul 2025384 AMAQI
22nd Jul 2025385 AMAQI
22nd Jul 2025386 AMAQI
22nd Jul 2025387 AMAQI
22nd Jul 2025388 AMAQI
22nd Jul 2025349 AMAQI
22nd Jul 20253610 AMAQI
22nd Jul 20253711 AMAQI
22nd Jul 20253912 PMAQI
22nd Jul 2025441 PMAQI
22nd Jul 2025442 PMAQI
22nd Jul 2025473 PMAQI
22nd Jul 2025494 PMAQI
22nd Jul 2025485 PMAQI
22nd Jul 2025476 PMAQI
22nd Jul 2025527 PMAQI
22nd Jul 2025458 PMAQI
22nd Jul 2025359 PMAQI
22nd Jul 20253410 PMAQI
22nd Jul 20253111 PMAQI
23rd Jul 20253412 AMAQI
23rd Jul 2025381 AMAQI
23rd Jul 2025382 AMAQI
23rd Jul 2025383 AMAQI
32°C27/38°C
23rd Jul 2025384 AMAQI
23rd Jul 2025395 AMAQI
23rd Jul 2025396 AMAQI
23rd Jul 2025397 AMAQI
23rd Jul 2025398 AMAQI
23rd Jul 2025309 AMAQI
23rd Jul 20253510 AMAQI
23rd Jul 20254211 AMAQI
23rd Jul 20254512 PMAQI
23rd Jul 2025491 PMAQI
23rd Jul 2025522 PMAQI
23rd Jul 2025523 PMAQI
23rd Jul 2025554 PMAQI
23rd Jul 2025555 PMAQI
23rd Jul 2025546 PMAQI
23rd Jul 2025517 PMAQI
23rd Jul 2025468 PMAQI
23rd Jul 2025409 PMAQI
23rd Jul 20253810 PMAQI
23rd Jul 20253411 PMAQI
24th Jul 20253312 AMAQI
24th Jul 2025371 AMAQI
24th Jul 2025382 AMAQI
24th Jul 2025393 AMAQI
32°C27/38°C
24th Jul 2025394 AMAQI
24th Jul 2025415 AMAQI
24th Jul 2025416 AMAQI
24th Jul 2025417 AMAQI
24th Jul 2025418 AMAQI
24th Jul 2025329 AMAQI
24th Jul 20253410 AMAQI
24th Jul 20254211 AMAQI
24th Jul 20255112 PMAQI
24th Jul 2025541 PMAQI
24th Jul 2025532 PMAQI
24th Jul 2025483 PMAQI
24th Jul 2025504 PMAQI
24th Jul 2025555 PMAQI
24th Jul 2025506 PMAQI
24th Jul 2025507 PMAQI
24th Jul 2025468 PMAQI
24th Jul 2025449 PMAQI
24th Jul 20253810 PMAQI
24th Jul 20253411 PMAQI
25th Jul 20253312 AMAQI
25th Jul 2025371 AMAQI
25th Jul 2025392 AMAQI
25th Jul 2025393 AMAQI
32°C27/38°C
25th Jul 2025404 AMAQI
25th Jul 2025425 AMAQI
25th Jul 2025426 AMAQI
25th Jul 2025427 AMAQI
25th Jul 2025428 AMAQI
25th Jul 2025349 AMAQI
25th Jul 20254210 AMAQI
25th Jul 20254811 AMAQI
25th Jul 20254912 PMAQI
25th Jul 2025521 PMAQI
25th Jul 2025522 PMAQI
25th Jul 2025533 PMAQI
25th Jul 2025564 PMAQI
25th Jul 2025545 PMAQI
25th Jul 2025446 PMAQI
25th Jul 2025387 PMAQI
25th Jul 2025408 PMAQI
25th Jul 2025379 PMAQI
25th Jul 20253210 PMAQI
25th Jul 20253011 PMAQI
26th Jul 20253012 AMAQI
26th Jul 2025371 AMAQI
26th Jul 2025412 AMAQI
26th Jul 2025413 AMAQI
32°C28/38°C
26th Jul 2025424 AMAQI
26th Jul 2025445 AMAQI
26th Jul 2025436 AMAQI
26th Jul 2025447 AMAQI
26th Jul 2025448 AMAQI
26th Jul 2025359 AMAQI
26th Jul 20254610 AMAQI
26th Jul 20255711 AMAQI
26th Jul 20255712 PMAQI
26th Jul 2025561 PMAQI
26th Jul 2025592 PMAQI
26th Jul 2025603 PMAQI
26th Jul 2025624 PMAQI
26th Jul 2025595 PMAQI
26th Jul 2025486 PMAQI
26th Jul 2025407 PMAQI
26th Jul 2025418 PMAQI
26th Jul 2025349 PMAQI
26th Jul 20252910 PMAQI
26th Jul 20252911 PMAQI
27th Jul 20253012 AMAQI
27th Jul 2025371 AMAQI
27th Jul 2025402 AMAQI
27th Jul 2025413 AMAQI
32°C27/38°C
27th Jul 2025434 AMAQI
27th Jul 2025465 AMAQI
27th Jul 2025466 AMAQI
27th Jul 2025457 AMAQI
27th Jul 2025468 AMAQI
27th Jul 2025429 AMAQI
27th Jul 20254310 AMAQI
27th Jul 20254311 AMAQI
27th Jul 20254412 PMAQI
27th Jul 2025441 PMAQI
27th Jul 2025442 PMAQI
27th Jul 2025443 PMAQI
27th Jul 2025404 PMAQI
27th Jul 2025435 PMAQI
27th Jul 2025326 PMAQI
27th Jul 2025277 PMAQI
27th Jul 2025308 PMAQI
27th Jul 2025329 PMAQI
27th Jul 20253010 PMAQI
27th Jul 20252911 PMAQI
28th Jul 20252912 AMAQI
28th Jul 2025381 AMAQI
28th Jul 2025412 AMAQI
28th Jul 2025423 AMAQI
32°C27/38°C
28th Jul 2025424 AMAQI
28th Jul 2025435 AMAQI
28th Jul 2025436 AMAQI
28th Jul 2025427 AMAQI
28th Jul 2025428 AMAQI
28th Jul 2025289 AMAQI
28th Jul 20252710 AMAQI
28th Jul 20253311 AMAQI
28th Jul 20253812 PMAQI
28th Jul 2025401 PMAQI
28th Jul 2025362 PMAQI
28th Jul 2025353 PMAQI
28th Jul 2025414 PMAQI
28th Jul 2025475 PMAQI
28th Jul 2025466 PMAQI
28th Jul 2025437 PMAQI
28th Jul 2025438 PMAQI
28th Jul 2025439 PMAQI
28th Jul 20254410 PMAQI
28th Jul 20254111 PMAQI
29th Jul 20253912 AMAQI
29th Jul 2025401 AMAQI
29th Jul 2025412 AMAQI
29th Jul 2025413 AMAQI
32°C27/39°C
29th Jul 2025414 AMAQI
29th Jul 2025415 AMAQI
29th Jul 2025416 AMAQI
29th Jul 2025417 AMAQI
29th Jul 2025418 AMAQI
29th Jul 2025299 AMAQI
29th Jul 20253610 AMAQI
29th Jul 20254211 AMAQI
29th Jul 20254512 PMAQI
29th Jul 2025441 PMAQI
29th Jul 2025442 PMAQI
29th Jul 2025443 PMAQI
29th Jul 2025454 PMAQI
29th Jul 2025425 PMAQI
29th Jul 2025366 PMAQI
29th Jul 2025297 PMAQI
29th Jul 2025318 PMAQI
29th Jul 2025379 PMAQI
29th Jul 20253110 PMAQI
29th Jul 20252811 PMAQI
30th Jul 20252812 AMAQI
30th Jul 2025321 AMAQI
30th Jul 2025382 AMAQI
30th Jul 2025423 AMAQI
32°C28/39°C
30th Jul 2025424 AMAQI
30th Jul 2025435 AMAQI
30th Jul 2025426 AMAQI
30th Jul 2025427 AMAQI
30th Jul 2025428 AMAQI
30th Jul 2025249 AMAQI
30th Jul 20251910 AMAQI
30th Jul 20251811 AMAQI
30th Jul 20252212 PMAQI
30th Jul 2025251 PMAQI
30th Jul 2025242 PMAQI
30th Jul 2025253 PMAQI
30th Jul 2025264 PMAQI
30th Jul 2025255 PMAQI
30th Jul 2025246 PMAQI
30th Jul 2025327 PMAQI
30th Jul 2025368 PMAQI
30th Jul 2025359 PMAQI
30th Jul 20253210 PMAQI
30th Jul 20253111 PMAQI
31st Jul 20253112 AMAQI
31st Jul 2025371 AMAQI
31st Jul 2025402 AMAQI
31st Jul 2025403 AMAQI
30°C26/37°C
31st Jul 2025404 AMAQI
31st Jul 2025405 AMAQI
31st Jul 2025406 AMAQI
31st Jul 2025407 AMAQI
31st Jul 2025408 AMAQI
31st Jul 2025409 AMAQI
31st Jul 20254010 AMAQI
31st Jul 20253511 AMAQI
31st Jul 20252712 PMAQI
31st Jul 2025261 PMAQI
31st Jul 2025242 PMAQI
31st Jul 2025233 PMAQI
31st Jul 2025234 PMAQI
31st Jul 2025225 PMAQI
31st Jul 2025226 PMAQI
31st Jul 2025247 PMAQI
31st Jul 2025288 PMAQI
31st Jul 2025299 PMAQI
31st Jul 20253210 PMAQI
31st Jul 20252811 PMAQI
1st Aug 20253012 AMAQI
1st Aug 2025331 AMAQI
1st Aug 2025322 AMAQI
1st Aug 2025373 AMAQI
29°C25/35°C
1st Aug 2025374 AMAQI
1st Aug 2025365 AMAQI
1st Aug 2025366 AMAQI
1st Aug 2025357 AMAQI
1st Aug 2025378 AMAQI
1st Aug 2025379 AMAQI
1st Aug 20253310 AMAQI
1st Aug 20254211 AMAQI
1st Aug 20254212 PMAQI
1st Aug 2025361 PMAQI
1st Aug 2025322 PMAQI
1st Aug 2025293 PMAQI
1st Aug 2025424 PMAQI
1st Aug 2025355 PMAQI
1st Aug 2025436 PMAQI
1st Aug 2025277 PMAQI
1st Aug 2025288 PMAQI
1st Aug 2025299 PMAQI
1st Aug 20253310 PMAQI
1st Aug 20252811 PMAQI
2nd Aug 20252912 AMAQI
2nd Aug 2025341 AMAQI
2nd Aug 2025382 AMAQI
2nd Aug 2025393 AMAQI
28°C25/32°C
2nd Aug 2025394 AMAQI
2nd Aug 2025385 AMAQI
2nd Aug 2025406 AMAQI
2nd Aug 2025387 AMAQI
2nd Aug 2025398 AMAQI
2nd Aug 2025349 AMAQI
2nd Aug 20253710 AMAQI
2nd Aug 20254811 AMAQI
2nd Aug 20253012 PMAQI
2nd Aug 2025411 PMAQI
2nd Aug 2025512 PMAQI
2nd Aug 2025513 PMAQI
2nd Aug 2025424 PMAQI
2nd Aug 2025445 PMAQI
2nd Aug 2025486 PMAQI
2nd Aug 2025497 PMAQI
2nd Aug 2025418 PMAQI
2nd Aug 2025389 PMAQI
2nd Aug 20253410 PMAQI
2nd Aug 20254111 PMAQI
3rd Aug 20253312 AMAQI
3rd Aug 2025351 AMAQI
3rd Aug 2025372 AMAQI
3rd Aug 2025383 AMAQI
32°C27/38°C
3rd Aug 2025404 AMAQI
3rd Aug 2025395 AMAQI
3rd Aug 2025386 AMAQI
3rd Aug 2025407 AMAQI
3rd Aug 2025388 AMAQI
3rd Aug 2025449 AMAQI
3rd Aug 20255210 AMAQI
3rd Aug 20255011 AMAQI
3rd Aug 20255612 PMAQI
3rd Aug 2025531 PMAQI
3rd Aug 2025532 PMAQI
3rd Aug 2025503 PMAQI
3rd Aug 2025414 PMAQI
3rd Aug 2025475 PMAQI
3rd Aug 2025506 PMAQI
3rd Aug 2025447 PMAQI
3rd Aug 2025448 PMAQI
3rd Aug 2025409 PMAQI
3rd Aug 20253910 PMAQI
3rd Aug 20253811 PMAQI
4th Aug 20253712 AMAQI
4th Aug 2025381 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025403 AMAQI
32°C28/38°C
4th Aug 2025414 AMAQI
4th Aug 2025425 AMAQI
4th Aug 2025426 AMAQI
4th Aug 2025427 AMAQI
4th Aug 2025438 AMAQI
4th Aug 2025569 AMAQI
4th Aug 20256210 AMAQI
4th Aug 20257111 AMAQI
4th Aug 20257112 PMAQI
4th Aug 2025701 PMAQI
4th Aug 2025772 PMAQI
4th Aug 2025733 PMAQI
4th Aug 2025804 PMAQI
4th Aug 2025885 PMAQI
4th Aug 2025726 PMAQI
4th Aug 2025727 PMAQI
4th Aug 2025648 PMAQI
4th Aug 2025589 PMAQI
4th Aug 20255510 PMAQI
4th Aug 20254611 PMAQI
5th Aug 20255612 AMAQI
5th Aug 2025411 AMAQI
5th Aug 2025402 AMAQI
5th Aug 2025403 AMAQI
--°C/°C
5th Aug 2025504 AMAQI
4 AM5th Aug 2025525 AMAQI
11 AM
6 PM
11 PM
3 AM
--°C/°C
Day time
Avg. Highest Time
4 AM - 8 AM
48AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
9 AM - 10 AM
42AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 8 AM (Avg. 48), while the lowest AQI was between 9 AM to 10 AM (Avg. 42).
Night time
Avg. Highest Time
1 AM - 3 AM
46AQI
3 hours / Day
90 hours / Month
Avg. Lowest Time
7 PM - 11 PM
43AQI
5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 AM to 3 AM (Avg. 46), while the lowest AQI was between 7 PM to 11 PM (Avg. 43).
2025 Days Vs Air Quality
Koga, Ibaraki, Japan
2025
93%
201
7%
14
Total number of days with different AQI categories in last 216 days in 2025 (149 days remaining)
Good
201 DaysModerate
14 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 93%
Health Risk Level:
Very Low
In 2025, 93% of 216 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
Koga, 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
31AQI
31AQI
2nd January 2025
29AQI
29AQI
3rd January 2025
24AQI
24AQI
4th January 2025
26AQI
26AQI
5th January 2025
33AQI
33AQI
6th January 2025
50AQI
50AQI
7th January 2025
34AQI
34AQI
8th January 2025
37AQI
37AQI
9th January 2025
31AQI
31AQI
10th January 2025
28AQI
28AQI
11th January 2025
27AQI
27AQI
12th January 2025
40AQI
40AQI
13th January 2025
29AQI
29AQI
14th January 2025
38AQI
38AQI
15th January 2025
35AQI
35AQI
16th January 2025
34AQI
34AQI
17th January 2025
30AQI
30AQI
18th January 2025
37AQI
37AQI
19th January 2025
54AQI
54AQI
20th January 2025
38AQI
38AQI
21st January 2025
42AQI
42AQI
22nd January 2025
37AQI
37AQI
23rd January 2025
43AQI
43AQI
24th January 2025
44AQI
44AQI
25th January 2025
36AQI
36AQI
26th January 2025
33AQI
33AQI
27th January 2025
37AQI
37AQI
28th January 2025
40AQI
40AQI
29th January 2025
32AQI
32AQI
30th January 2025
32AQI
32AQI
31st January 2025
29AQI
29AQI
1st February 2025
39AQI
39AQI
2nd February 2025
30AQI
30AQI
3rd February 2025
35AQI
35AQI
4th February 2025
30AQI
30AQI
5th February 2025
32AQI
32AQI
6th February 2025
29AQI
29AQI
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
41AQI
41AQI
13th February 2025
34AQI
34AQI
14th February 2025
34AQI
34AQI
15th February 2025
31AQI
31AQI
16th February 2025
37AQI
37AQI
17th February 2025
35AQI
35AQI
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
33AQI
33AQI
24th February 2025
32AQI
32AQI
25th February 2025
33AQI
33AQI
26th February 2025
37AQI
37AQI
27th February 2025
40AQI
40AQI
28th February 2025
49AQI
49AQI
1st March 2025
47AQI
47AQI
2nd March 2025
56AQI
56AQI
3rd March 2025
40AQI
40AQI
4th March 2025
37AQI
37AQI
5th March 2025
28AQI
28AQI
6th March 2025
32AQI
32AQI
7th March 2025
31AQI
31AQI
8th March 2025
38AQI
38AQI
9th March 2025
33AQI
33AQI
10th March 2025
37AQI
37AQI
11th March 2025
38AQI
38AQI
12th March 2025
41AQI
41AQI
13th March 2025
40AQI
40AQI
14th March 2025
31AQI
31AQI
15th March 2025
36AQI
36AQI
16th March 2025
21AQI
21AQI
17th March 2025
21AQI
21AQI
18th March 2025
22AQI
22AQI
19th March 2025
18AQI
18AQI
20th March 2025
23AQI
23AQI
21st March 2025
37AQI
37AQI
22nd March 2025
45AQI
45AQI
23rd March 2025
48AQI
48AQI
24th March 2025
48AQI
48AQI
25th March 2025
63AQI
63AQI
26th March 2025
62AQI
62AQI
27th March 2025
67AQI
67AQI
28th March 2025
49AQI
49AQI
29th March 2025
37AQI
37AQI
30th March 2025
34AQI
34AQI
31st March 2025
31AQI
31AQI
1st April 2025
25AQI
25AQI
2nd April 2025
21AQI
21AQI
3rd April 2025
21AQI
21AQI
4th April 2025
21AQI
21AQI
5th April 2025
24AQI
24AQI
6th April 2025
23AQI
23AQI
7th April 2025
25AQI
25AQI
8th April 2025
33AQI
33AQI
9th April 2025
25AQI
25AQI
10th April 2025
42AQI
42AQI
11th April 2025
35AQI
35AQI
12th April 2025
34AQI
34AQI
13th April 2025
25AQI
25AQI
14th April 2025
28AQI
28AQI
15th April 2025
23AQI
23AQI
16th April 2025
24AQI
24AQI
17th April 2025
40AQI
40AQI
18th April 2025
48AQI
48AQI
19th April 2025
58AQI
58AQI
20th April 2025
50AQI
50AQI
21st April 2025
40AQI
40AQI
22nd April 2025
45AQI
45AQI
23rd April 2025
28AQI
28AQI
24th April 2025
35AQI
35AQI
25th April 2025
34AQI
34AQI
26th April 2025
40AQI
40AQI
27th April 2025
43AQI
43AQI
28th April 2025
42AQI
42AQI
29th April 2025
31AQI
31AQI
30th April 2025
39AQI
39AQI
1st May 2025
35AQI
35AQI
2nd May 2025
24AQI
24AQI
3rd May 2025
28AQI
28AQI
4th May 2025
31AQI
31AQI
5th May 2025
30AQI
30AQI
6th May 2025
27AQI
27AQI
7th May 2025
22AQI
22AQI
8th May 2025
27AQI
27AQI
9th May 2025
28AQI
28AQI
10th May 2025
19AQI
19AQI
11th May 2025
20AQI
20AQI
12th May 2025
20AQI
20AQI
13th May 2025
32AQI
32AQI
14th May 2025
37AQI
37AQI
15th May 2025
38AQI
38AQI
16th May 2025
43AQI
43AQI
17th May 2025
24AQI
24AQI
18th May 2025
38AQI
38AQI
19th May 2025
34AQI
34AQI
20th May 2025
53AQI
53AQI
21st May 2025
49AQI
49AQI
22nd May 2025
44AQI
44AQI
23rd May 2025
42AQI
42AQI
24th May 2025
37AQI
37AQI
25th May 2025
29AQI
29AQI
26th May 2025
27AQI
27AQI
27th May 2025
24AQI
24AQI
28th May 2025
23AQI
23AQI
29th May 2025
28AQI
28AQI
30th May 2025
21AQI
21AQI
31st May 2025
18AQI
18AQI
1st June 2025
20AQI
20AQI
2nd June 2025
29AQI
29AQI
3rd June 2025
28AQI
28AQI
4th June 2025
25AQI
25AQI
5th June 2025
33AQI
33AQI
6th June 2025
42AQI
42AQI
7th June 2025
46AQI
46AQI
8th June 2025
56AQI
56AQI
9th June 2025
48AQI
48AQI
10th June 2025
33AQI
33AQI
11th June 2025
30AQI
30AQI
12th June 2025
40AQI
40AQI
13th June 2025
37AQI
37AQI
14th June 2025
32AQI
32AQI
15th June 2025
29AQI
29AQI
16th June 2025
37AQI
37AQI
17th June 2025
43AQI
43AQI
18th June 2025
37AQI
37AQI
19th June 2025
40AQI
40AQI
20th June 2025
38AQI
38AQI
21st June 2025
34AQI
34AQI
22nd June 2025
29AQI
29AQI
23rd June 2025
28AQI
28AQI
24th June 2025
30AQI
30AQI
25th June 2025
24AQI
24AQI
26th June 2025
28AQI
28AQI
27th June 2025
31AQI
31AQI
28th June 2025
31AQI
31AQI
29th June 2025
39AQI
39AQI
30th June 2025
44AQI
44AQI
1st July 2025
44AQI
44AQI
2nd July 2025
47AQI
47AQI
3rd July 2025
48AQI
48AQI
4th July 2025
47AQI
47AQI
5th July 2025
51AQI
51AQI
6th July 2025
60AQI
60AQI
7th July 2025
73AQI
73AQI
8th July 2025
74AQI
74AQI
9th July 2025
75AQI
75AQI
10th July 2025
58AQI
58AQI
11th July 2025
45AQI
45AQI
12th July 2025
48AQI
48AQI
13th July 2025
50AQI
50AQI
14th July 2025
41AQI
41AQI
15th July 2025
37AQI
37AQI
16th July 2025
38AQI
38AQI
17th July 2025
38AQI
38AQI
18th July 2025
34AQI
34AQI
19th July 2025
34AQI
34AQI
20th July 2025
33AQI
33AQI
21st July 2025
38AQI
38AQI
22nd July 2025
40AQI
40AQI
23rd July 2025
42AQI
42AQI
24th July 2025
43AQI
43AQI
25th July 2025
42AQI
42AQI
26th July 2025
44AQI
44AQI
27th July 2025
38AQI
38AQI
28th July 2025
40AQI
40AQI
29th July 2025
38AQI
38AQI
30th July 2025
32AQI
32AQI
31st July 2025
32AQI
32AQI
1st August 2025
34AQI
34AQI
2nd August 2025
40AQI
40AQI
3rd August 2025
43AQI
43AQI
35AQI
33AQI
38AQI
33AQI
31AQI
35AQI
45AQI
39AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202536AQI
30
1
28
27
4
29
1
30
1
29
1
25
6
3
201
14
Highest AQI recorded in
July45AQI
Lowest AQI recorded in
May31AQI
202435AQI
30
1
25
4
29
2
26
4
28
3
28
2
24
7
31
29
1
30
1
30
30
1
340
26
Highest AQI recorded in
July43AQI
Lowest AQI recorded in
August26AQI
202336AQI
27
4
26
2
29
2
28
2
30
1
25
5
26
5
31
30
31
25
4
27
4
335
29
Highest AQI recorded in
July41AQI
Lowest AQI recorded in
August28AQI
202235AQI
25
6
21
27
4
16
1
28
3
27
3
18
3
1
28
31
28
2
31
281
22
Highest AQI recorded in
January39AQI
Lowest AQI recorded in
September29AQI
202137AQI
21
10
20
8
24
7
27
3
28
3
26
4
31
29
2
29
1
28
3
22
8
23
8
308
57
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
July33AQI
202035AQI
11
2
19
2
17
1
25
5
31
24
7
19
28
3
17
13
21
10
212
43
Highest AQI recorded in
November45AQI
Lowest AQI recorded in
September27AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2021(Avg.)
37AQILeast Polluted Year Recorded
2024(Avg.)
35AQIKoga's annual 2025 AQI (36) shows an average percentage change of 1.5% (worsened AQI) compared to previous years: 2020 (35), 2021 (37), 2022 (35), 2023 (36), 2024 (35).
