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+
November Air Quality Analysis
Koga, Ibaraki, Japan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Nov 2023
66AQILowest AQI recorded on
15th Nov 2022
19AQISame Day Analysis (9th November ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 52 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 10th Nov - 11th Nov 2025
Koga, Ibaraki, Japan
AQI
Day
Night
.
5 AM10th Nov 2025
4 PM
4 AM11th Nov 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
5AM10th Nov
61AQI
Avg. Lowest Time
11PM10th Nov
20AQI
In the last 24 hours,
Koga's AQI reached its highest point of 61 at 5 AM during the Night, while the lowest point, 20, was recorded at 11 PM during the Night between 10th Nov and 11th Nov 2025.
Day & Night AQI Trend : Oct - Nov 2025
Koga, Ibaraki, Japan
OctNov
12th - 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 - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th
Day
Night
12th Oct 2025335 AMAQI
12th Oct 2025356 AMAQI
12th Oct 2025147 AMAQI
12th Oct 2025418 AMAQI
12th Oct 2025429 AMAQI
12th Oct 20254110 AMAQI
12th Oct 20254411 AMAQI
12th Oct 20254512 PMAQI
12th Oct 2025451 PMAQI
12th Oct 2025482 PMAQI
12th Oct 2025473 PMAQI
12th Oct 2025464 PMAQI
12th Oct 2025465 PMAQI
12th Oct 2025496 PMAQI
12th Oct 2025477 PMAQI
12th Oct 2025478 PMAQI
12th Oct 2025489 PMAQI
12th Oct 20255510 PMAQI
12th Oct 20255811 PMAQI
13th Oct 20255412 AMAQI
13th Oct 2025541 AMAQI
13th Oct 2025532 AMAQI
13th Oct 2025533 AMAQI
13th Oct 2025544 AMAQI
21°C17/26°C
13th Oct 2025545 AMAQI
13th Oct 2025526 AMAQI
13th Oct 2025507 AMAQI
13th Oct 2025518 AMAQI
13th Oct 2025489 AMAQI
13th Oct 20254910 AMAQI
13th Oct 20254911 AMAQI
13th Oct 20255212 PMAQI
13th Oct 2025511 PMAQI
13th Oct 2025532 PMAQI
13th Oct 2025543 PMAQI
13th Oct 2025544 PMAQI
13th Oct 2025525 PMAQI
13th Oct 2025546 PMAQI
13th Oct 2025547 PMAQI
13th Oct 2025498 PMAQI
13th Oct 2025559 PMAQI
13th Oct 20255410 PMAQI
13th Oct 20255611 PMAQI
14th Oct 20255612 AMAQI
14th Oct 2025541 AMAQI
14th Oct 2025562 AMAQI
14th Oct 2025543 AMAQI
14th Oct 2025544 AMAQI
22°C21/24°C
14th Oct 2025525 AMAQI
14th Oct 2025496 AMAQI
14th Oct 2025487 AMAQI
14th Oct 2025528 AMAQI
14th Oct 2025539 AMAQI
14th Oct 20255310 AMAQI
14th Oct 20255011 AMAQI
14th Oct 20254312 PMAQI
14th Oct 2025511 PMAQI
14th Oct 2025562 PMAQI
14th Oct 2025533 PMAQI
14th Oct 2025474 PMAQI
14th Oct 2025515 PMAQI
14th Oct 2025446 PMAQI
14th Oct 2025467 PMAQI
14th Oct 2025508 PMAQI
14th Oct 2025579 PMAQI
14th Oct 20255710 PMAQI
14th Oct 20255011 PMAQI
15th Oct 20255212 AMAQI
15th Oct 2025501 AMAQI
15th Oct 2025502 AMAQI
15th Oct 2025503 AMAQI
15th Oct 2025514 AMAQI
19°C17/21°C
15th Oct 2025495 AMAQI
15th Oct 2025486 AMAQI
15th Oct 2025447 AMAQI
15th Oct 2025468 AMAQI
15th Oct 2025519 AMAQI
15th Oct 20255110 AMAQI
15th Oct 20254911 AMAQI
15th Oct 20254112 PMAQI
15th Oct 2025401 PMAQI
15th Oct 2025382 PMAQI
15th Oct 2025403 PMAQI
15th Oct 2025444 PMAQI
15th Oct 2025485 PMAQI
15th Oct 2025436 PMAQI
15th Oct 2025537 PMAQI
15th Oct 2025548 PMAQI
15th Oct 2025549 PMAQI
15th Oct 20255210 PMAQI
15th Oct 20254611 PMAQI
16th Oct 20255612 AMAQI
16th Oct 2025571 AMAQI
16th Oct 2025562 AMAQI
16th Oct 2025553 AMAQI
16th Oct 2025504 AMAQI
19°C16/22°C
16th Oct 2025535 AMAQI
16th Oct 2025566 AMAQI
16th Oct 2025497 AMAQI
16th Oct 2025518 AMAQI
16th Oct 2025509 AMAQI
16th Oct 20255210 AMAQI
16th Oct 20255111 AMAQI
16th Oct 20255612 PMAQI
16th Oct 2025561 PMAQI
16th Oct 2025602 PMAQI
16th Oct 2025533 PMAQI
16th Oct 2025514 PMAQI
16th Oct 2025515 PMAQI
16th Oct 2025526 PMAQI
16th Oct 2025507 PMAQI
16th Oct 2025508 PMAQI
16th Oct 2025539 PMAQI
16th Oct 20255510 PMAQI
16th Oct 20255611 PMAQI
17th Oct 20255512 AMAQI
17th Oct 2025521 AMAQI
17th Oct 2025542 AMAQI
17th Oct 2025533 AMAQI
17th Oct 2025564 AMAQI
19°C18/21°C
17th Oct 2025555 AMAQI
17th Oct 2025496 AMAQI
17th Oct 2025447 AMAQI
17th Oct 2025478 AMAQI
17th Oct 2025439 AMAQI
17th Oct 20254010 AMAQI
17th Oct 20254311 AMAQI
17th Oct 20255112 PMAQI
17th Oct 2025511 PMAQI
17th Oct 2025502 PMAQI
17th Oct 2025563 PMAQI
17th Oct 2025564 PMAQI
17th Oct 2025565 PMAQI
17th Oct 2025546 PMAQI
17th Oct 2025417 PMAQI
17th Oct 2025418 PMAQI
17th Oct 2025429 PMAQI
17th Oct 20255410 PMAQI
17th Oct 20255111 PMAQI
18th Oct 20254812 AMAQI
18th Oct 2025541 AMAQI
18th Oct 2025562 AMAQI
18th Oct 2025563 AMAQI
18th Oct 2025554 AMAQI
21°C18/26°C
18th Oct 2025555 AMAQI
18th Oct 2025516 AMAQI
18th Oct 2025527 AMAQI
18th Oct 2025548 AMAQI
18th Oct 2025559 AMAQI
18th Oct 20255310 AMAQI
18th Oct 20255711 AMAQI
18th Oct 20255412 PMAQI
18th Oct 2025491 PMAQI
18th Oct 2025532 PMAQI
18th Oct 2025453 PMAQI
18th Oct 2025474 PMAQI
18th Oct 2025495 PMAQI
18th Oct 2025536 PMAQI
18th Oct 2025587 PMAQI
18th Oct 2025598 PMAQI
18th Oct 2025539 PMAQI
18th Oct 20257010 PMAQI
18th Oct 20256311 PMAQI
19th Oct 20255512 AMAQI
19th Oct 2025551 AMAQI
19th Oct 2025562 AMAQI
19th Oct 2025583 AMAQI
19th Oct 2025544 AMAQI
22°C18/27°C
19th Oct 2025545 AMAQI
19th Oct 2025456 AMAQI
19th Oct 2025477 AMAQI
19th Oct 2025548 AMAQI
19th Oct 2025579 AMAQI
19th Oct 20255610 AMAQI
19th Oct 20255511 AMAQI
19th Oct 20255312 PMAQI
19th Oct 2025601 PMAQI
19th Oct 2025502 PMAQI
19th Oct 2025453 PMAQI
19th Oct 2025484 PMAQI
19th Oct 2025465 PMAQI
19th Oct 2025486 PMAQI
19th Oct 2025527 PMAQI
19th Oct 2025518 PMAQI
19th Oct 2025519 PMAQI
19th Oct 20255210 PMAQI
19th Oct 20254711 PMAQI
20th Oct 20253912 AMAQI
20th Oct 2025561 AMAQI
20th Oct 2025562 AMAQI
20th Oct 2025563 AMAQI
20th Oct 2025564 AMAQI
21°C17/23°C
20th Oct 2025585 AMAQI
20th Oct 2025586 AMAQI
20th Oct 2025597 AMAQI
20th Oct 2025588 AMAQI
20th Oct 2025589 AMAQI
20th Oct 20255710 AMAQI
20th Oct 20255611 AMAQI
20th Oct 20255712 PMAQI
20th Oct 2025571 PMAQI
20th Oct 2025562 PMAQI
20th Oct 2025553 PMAQI
20th Oct 2025554 PMAQI
20th Oct 2025555 PMAQI
20th Oct 2025576 PMAQI
20th Oct 2025587 PMAQI
20th Oct 2025588 PMAQI
20th Oct 2025589 PMAQI
20th Oct 20255810 PMAQI
20th Oct 20255711 PMAQI
21st Oct 20255612 AMAQI
21st Oct 2025561 AMAQI
21st Oct 2025572 AMAQI
21st Oct 2025333 AMAQI
21st Oct 2025594 AMAQI
19°C16/23°C
21st Oct 2025585 AMAQI
21st Oct 2025586 AMAQI
21st Oct 2025167 AMAQI
21st Oct 2025158 AMAQI
21st Oct 2025159 AMAQI
21st Oct 20252010 AMAQI
21st Oct 20252811 AMAQI
21st Oct 20255612 PMAQI
21st Oct 2025561 PMAQI
21st Oct 2025562 PMAQI
21st Oct 2025553 PMAQI
21st Oct 2025564 PMAQI
21st Oct 2025565 PMAQI
21st Oct 2025556 PMAQI
21st Oct 2025567 PMAQI
21st Oct 2025558 PMAQI
21st Oct 2025549 PMAQI
21st Oct 20255410 PMAQI
21st Oct 20255011 PMAQI
22nd Oct 20254812 AMAQI
22nd Oct 2025451 AMAQI
22nd Oct 2025472 AMAQI
22nd Oct 2025493 AMAQI
22nd Oct 2025474 AMAQI
15°C13/17°C
22nd Oct 2025425 AMAQI
22nd Oct 2025316 AMAQI
22nd Oct 2025327 AMAQI
22nd Oct 2025358 AMAQI
22nd Oct 2025339 AMAQI
22nd Oct 20253210 AMAQI
22nd Oct 20252511 AMAQI
22nd Oct 20253412 PMAQI
22nd Oct 2025361 PMAQI
22nd Oct 2025362 PMAQI
22nd Oct 2025333 PMAQI
22nd Oct 2025394 PMAQI
22nd Oct 2025445 PMAQI
22nd Oct 2025446 PMAQI
22nd Oct 2025477 PMAQI
22nd Oct 2025478 PMAQI
22nd Oct 2025489 PMAQI
22nd Oct 20255110 PMAQI
22nd Oct 20255311 PMAQI
23rd Oct 20254612 AMAQI
23rd Oct 2025441 AMAQI
23rd Oct 2025442 AMAQI
23rd Oct 2025413 AMAQI
23rd Oct 2025424 AMAQI
13°C12/14°C
23rd Oct 2025435 AMAQI
23rd Oct 2025436 AMAQI
23rd Oct 2025447 AMAQI
23rd Oct 2025208 AMAQI
23rd Oct 2025229 AMAQI
23rd Oct 20252410 AMAQI
23rd Oct 20253011 AMAQI
23rd Oct 20253612 PMAQI
23rd Oct 2025331 PMAQI
23rd Oct 2025342 PMAQI
23rd Oct 2025343 PMAQI
23rd Oct 2025354 PMAQI
23rd Oct 2025375 PMAQI
23rd Oct 2025396 PMAQI
23rd Oct 2025407 PMAQI
23rd Oct 2025428 PMAQI
23rd Oct 2025459 PMAQI
23rd Oct 20254210 PMAQI
23rd Oct 20254211 PMAQI
24th Oct 20254812 AMAQI
24th Oct 2025501 AMAQI
24th Oct 2025502 AMAQI
24th Oct 2025503 AMAQI
24th Oct 2025504 AMAQI
15°C13/19°C
24th Oct 2025455 AMAQI
24th Oct 2025456 AMAQI
24th Oct 2025447 AMAQI
24th Oct 2025448 AMAQI
24th Oct 2025449 AMAQI
24th Oct 20254510 AMAQI
24th Oct 20252911 AMAQI
24th Oct 20253112 PMAQI
24th Oct 2025421 PMAQI
24th Oct 2025442 PMAQI
24th Oct 2025423 PMAQI
24th Oct 2025394 PMAQI
24th Oct 2025425 PMAQI
24th Oct 2025436 PMAQI
24th Oct 2025557 PMAQI
24th Oct 2025558 PMAQI
24th Oct 2025569 PMAQI
24th Oct 20254210 PMAQI
24th Oct 20254411 PMAQI
25th Oct 20255012 AMAQI
25th Oct 2025521 AMAQI
25th Oct 2025522 AMAQI
25th Oct 2025523 AMAQI
25th Oct 2025384 AMAQI
15°C12/19°C
25th Oct 2025275 AMAQI
25th Oct 2025336 AMAQI
25th Oct 2025387 AMAQI
25th Oct 2025408 AMAQI
25th Oct 2025409 AMAQI
25th Oct 20253610 AMAQI
25th Oct 20253611 AMAQI
25th Oct 20253912 PMAQI
25th Oct 2025391 PMAQI
25th Oct 2025392 PMAQI
25th Oct 2025403 PMAQI
25th Oct 2025404 PMAQI
25th Oct 2025345 PMAQI
25th Oct 2025326 PMAQI
25th Oct 2025327 PMAQI
25th Oct 2025338 PMAQI
25th Oct 2025349 PMAQI
25th Oct 20253310 PMAQI
25th Oct 20253511 PMAQI
26th Oct 20253712 AMAQI
26th Oct 2025441 AMAQI
26th Oct 2025382 AMAQI
26th Oct 2025363 AMAQI
26th Oct 2025404 AMAQI
14°C13/14°C
26th Oct 2025405 AMAQI
26th Oct 2025396 AMAQI
26th Oct 2025347 AMAQI
26th Oct 2025308 AMAQI
26th Oct 2025239 AMAQI
26th Oct 20252010 AMAQI
26th Oct 20252011 AMAQI
26th Oct 20252012 PMAQI
26th Oct 2025221 PMAQI
26th Oct 2025222 PMAQI
26th Oct 2025203 PMAQI
26th Oct 2025204 PMAQI
26th Oct 2025265 PMAQI
26th Oct 2025316 PMAQI
26th Oct 2025347 PMAQI
26th Oct 2025318 PMAQI
26th Oct 2025289 PMAQI
26th Oct 20252510 PMAQI
26th Oct 20252811 PMAQI
27th Oct 20253312 AMAQI
27th Oct 2025291 AMAQI
27th Oct 2025282 AMAQI
27th Oct 2025283 AMAQI
27th Oct 2025294 AMAQI
16°C14/16°C
27th Oct 2025335 AMAQI
27th Oct 2025316 AMAQI
27th Oct 2025297 AMAQI
27th Oct 2025248 AMAQI
27th Oct 2025229 AMAQI
27th Oct 20252210 AMAQI
27th Oct 20252711 AMAQI
27th Oct 20253012 PMAQI
27th Oct 2025281 PMAQI
27th Oct 2025292 PMAQI
27th Oct 2025303 PMAQI
27th Oct 2025324 PMAQI
27th Oct 2025325 PMAQI
27th Oct 2025346 PMAQI
27th Oct 2025477 PMAQI
27th Oct 2025468 PMAQI
27th Oct 2025539 PMAQI
27th Oct 20255010 PMAQI
27th Oct 20255411 PMAQI
28th Oct 20255512 AMAQI
28th Oct 2025491 AMAQI
28th Oct 2025512 AMAQI
28th Oct 2025513 AMAQI
28th Oct 2025504 AMAQI
18°C15/22°C
28th Oct 2025505 AMAQI
28th Oct 2025286 AMAQI
28th Oct 2025257 AMAQI
28th Oct 2025338 AMAQI
28th Oct 2025429 AMAQI
28th Oct 20254410 AMAQI
28th Oct 20252511 AMAQI
28th Oct 20252212 PMAQI
28th Oct 2025221 PMAQI
28th Oct 2025342 PMAQI
28th Oct 2025223 PMAQI
28th Oct 2025234 PMAQI
28th Oct 2025225 PMAQI
28th Oct 2025226 PMAQI
28th Oct 2025307 PMAQI
28th Oct 2025398 PMAQI
28th Oct 2025399 PMAQI
28th Oct 20253610 PMAQI
28th Oct 20252311 PMAQI
29th Oct 20252412 AMAQI
29th Oct 2025281 AMAQI
29th Oct 2025302 AMAQI
29th Oct 2025303 AMAQI
29th Oct 2025294 AMAQI
17°C15/21°C
29th Oct 2025295 AMAQI
29th Oct 2025296 AMAQI
29th Oct 2025277 AMAQI
29th Oct 2025358 AMAQI
29th Oct 2025369 AMAQI
29th Oct 20254110 AMAQI
29th Oct 20254811 AMAQI
29th Oct 20253912 PMAQI
29th Oct 2025461 PMAQI
29th Oct 2025462 PMAQI
29th Oct 2025493 PMAQI
29th Oct 2025524 PMAQI
29th Oct 2025525 PMAQI
29th Oct 2025486 PMAQI
29th Oct 2025327 PMAQI
29th Oct 2025458 PMAQI
29th Oct 2025629 PMAQI
29th Oct 20256410 PMAQI
29th Oct 20256411 PMAQI
30th Oct 20256312 AMAQI
30th Oct 2025631 AMAQI
30th Oct 2025632 AMAQI
30th Oct 2025603 AMAQI
30th Oct 2025594 AMAQI
15°C13/16°C
30th Oct 2025555 AMAQI
30th Oct 2025536 AMAQI
30th Oct 2025557 AMAQI
30th Oct 2025578 AMAQI
30th Oct 2025689 AMAQI
30th Oct 20256310 AMAQI
30th Oct 20256711 AMAQI
30th Oct 20255712 PMAQI
30th Oct 2025551 PMAQI
30th Oct 2025562 PMAQI
30th Oct 2025583 PMAQI
30th Oct 2025584 PMAQI
30th Oct 2025585 PMAQI
30th Oct 2025596 PMAQI
30th Oct 2025597 PMAQI
30th Oct 2025598 PMAQI
30th Oct 2025689 PMAQI
30th Oct 20256910 PMAQI
30th Oct 20257011 PMAQI
31st Oct 20256912 AMAQI
31st Oct 2025641 AMAQI
31st Oct 2025602 AMAQI
31st Oct 2025573 AMAQI
31st Oct 2025534 AMAQI
15°C12/18°C
31st Oct 2025555 AMAQI
31st Oct 2025546 AMAQI
31st Oct 2025547 AMAQI
31st Oct 2025578 AMAQI
31st Oct 2025609 AMAQI
31st Oct 20256310 AMAQI
31st Oct 20255911 AMAQI
31st Oct 20256512 PMAQI
31st Oct 2025671 PMAQI
31st Oct 2025652 PMAQI
31st Oct 2025633 PMAQI
31st Oct 2025624 PMAQI
31st Oct 2025635 PMAQI
31st Oct 2025666 PMAQI
31st Oct 2025657 PMAQI
31st Oct 2025638 PMAQI
31st Oct 2025559 PMAQI
31st Oct 20255410 PMAQI
31st Oct 20255111 PMAQI
1st Nov 20253412 AMAQI
1st Nov 2025231 AMAQI
1st Nov 2025252 AMAQI
1st Nov 2025253 AMAQI
1st Nov 2025184 AMAQI
16°C14/19°C
1st Nov 2025175 AMAQI
1st Nov 2025176 AMAQI
1st Nov 2025177 AMAQI
1st Nov 2025158 AMAQI
1st Nov 2025189 AMAQI
1st Nov 20252210 AMAQI
1st Nov 20252111 AMAQI
1st Nov 20252912 PMAQI
1st Nov 2025311 PMAQI
1st Nov 2025162 PMAQI
1st Nov 2025133 PMAQI
1st Nov 2025144 PMAQI
1st Nov 2025185 PMAQI
1st Nov 2025246 PMAQI
1st Nov 2025327 PMAQI
1st Nov 2025348 PMAQI
1st Nov 2025379 PMAQI
1st Nov 20253210 PMAQI
1st Nov 20253311 PMAQI
2nd Nov 20254112 AMAQI
2nd Nov 2025411 AMAQI
2nd Nov 2025402 AMAQI
2nd Nov 2025283 AMAQI
2nd Nov 2025274 AMAQI
19°C15/24°C
2nd Nov 2025215 AMAQI
2nd Nov 2025226 AMAQI
2nd Nov 2025427 AMAQI
2nd Nov 2025388 AMAQI
2nd Nov 2025399 AMAQI
2nd Nov 20254110 AMAQI
2nd Nov 20255111 AMAQI
2nd Nov 20254612 PMAQI
2nd Nov 2025451 PMAQI
2nd Nov 2025322 PMAQI
2nd Nov 2025413 PMAQI
2nd Nov 2025394 PMAQI
2nd Nov 2025405 PMAQI
2nd Nov 2025436 PMAQI
2nd Nov 2025457 PMAQI
2nd Nov 2025418 PMAQI
2nd Nov 2025569 PMAQI
2nd Nov 20256210 PMAQI
2nd Nov 20256211 PMAQI
3rd Nov 20255812 AMAQI
3rd Nov 2025601 AMAQI
3rd Nov 2025602 AMAQI
3rd Nov 2025603 AMAQI
3rd Nov 2025554 AMAQI
17°C15/20°C
3rd Nov 2025505 AMAQI
3rd Nov 2025326 AMAQI
3rd Nov 2025307 AMAQI
3rd Nov 2025508 AMAQI
3rd Nov 2025439 AMAQI
3rd Nov 20254110 AMAQI
3rd Nov 20253811 AMAQI
3rd Nov 20252612 PMAQI
3rd Nov 2025291 PMAQI
3rd Nov 2025362 PMAQI
3rd Nov 2025343 PMAQI
3rd Nov 2025294 PMAQI
3rd Nov 2025185 PMAQI
3rd Nov 2025206 PMAQI
3rd Nov 2025227 PMAQI
3rd Nov 2025238 PMAQI
3rd Nov 2025289 PMAQI
3rd Nov 20252410 PMAQI
3rd Nov 20252211 PMAQI
4th Nov 20252512 AMAQI
4th Nov 2025251 AMAQI
4th Nov 2025212 AMAQI
4th Nov 2025203 AMAQI
4th Nov 2025244 AMAQI
15°C12/19°C
4th Nov 2025255 AMAQI
4th Nov 2025256 AMAQI
4th Nov 2025257 AMAQI
4th Nov 2025228 AMAQI
4th Nov 2025259 AMAQI
4th Nov 20253210 AMAQI
4th Nov 20254711 AMAQI
4th Nov 20254412 PMAQI
4th Nov 2025461 PMAQI
4th Nov 2025462 PMAQI
4th Nov 2025463 PMAQI
4th Nov 2025354 PMAQI
4th Nov 2025385 PMAQI
4th Nov 2025406 PMAQI
4th Nov 2025377 PMAQI
4th Nov 2025388 PMAQI
4th Nov 2025359 PMAQI
4th Nov 20254610 PMAQI
4th Nov 20254911 PMAQI
5th Nov 20255112 AMAQI
5th Nov 2025521 AMAQI
5th Nov 2025422 AMAQI
5th Nov 2025463 AMAQI
5th Nov 2025494 AMAQI
14°C11/17°C
5th Nov 2025485 AMAQI
5th Nov 2025356 AMAQI
5th Nov 2025357 AMAQI
5th Nov 2025388 AMAQI
5th Nov 2025549 AMAQI
5th Nov 20255910 AMAQI
5th Nov 20255911 AMAQI
5th Nov 20256012 PMAQI
5th Nov 2025601 PMAQI
5th Nov 2025602 PMAQI
5th Nov 2025363 PMAQI
5th Nov 2025274 PMAQI
5th Nov 2025475 PMAQI
5th Nov 2025556 PMAQI
5th Nov 2025597 PMAQI
5th Nov 2025698 PMAQI
5th Nov 2025709 PMAQI
5th Nov 20257110 PMAQI
5th Nov 20256011 PMAQI
6th Nov 20255512 AMAQI
6th Nov 2025591 AMAQI
6th Nov 2025582 AMAQI
6th Nov 2025583 AMAQI
6th Nov 2025514 AMAQI
15°C12/18°C
6th Nov 2025485 AMAQI
6th Nov 2025486 AMAQI
6th Nov 2025497 AMAQI
6th Nov 2025408 AMAQI
6th Nov 2025399 AMAQI
6th Nov 20254010 AMAQI
6th Nov 20254211 AMAQI
6th Nov 20254312 PMAQI
6th Nov 2025381 PMAQI
6th Nov 2025342 PMAQI
6th Nov 2025333 PMAQI
6th Nov 2025324 PMAQI
6th Nov 2025345 PMAQI
6th Nov 2025366 PMAQI
6th Nov 2025327 PMAQI
6th Nov 2025408 PMAQI
6th Nov 2025409 PMAQI
6th Nov 20253910 PMAQI
6th Nov 20254811 PMAQI
7th Nov 20255212 AMAQI
7th Nov 2025491 AMAQI
7th Nov 2025472 AMAQI
7th Nov 2025473 AMAQI
7th Nov 2025404 AMAQI
15°C14/16°C
7th Nov 2025415 AMAQI
7th Nov 2025416 AMAQI
7th Nov 2025437 AMAQI
7th Nov 2025548 AMAQI
7th Nov 2025549 AMAQI
7th Nov 20255610 AMAQI
7th Nov 20255811 AMAQI
7th Nov 20256112 PMAQI
7th Nov 2025611 PMAQI
7th Nov 2025612 PMAQI
7th Nov 2025533 PMAQI
7th Nov 2025454 PMAQI
7th Nov 2025415 PMAQI
7th Nov 2025436 PMAQI
7th Nov 2025447 PMAQI
7th Nov 2025438 PMAQI
7th Nov 2025379 PMAQI
7th Nov 20253410 PMAQI
7th Nov 20253611 PMAQI
8th Nov 20253712 AMAQI
8th Nov 2025391 AMAQI
8th Nov 2025332 AMAQI
8th Nov 2025393 AMAQI
8th Nov 2025404 AMAQI
16°C12/21°C
8th Nov 2025425 AMAQI
8th Nov 2025426 AMAQI
8th Nov 2025427 AMAQI
8th Nov 2025468 AMAQI
8th Nov 2025539 AMAQI
8th Nov 20255710 AMAQI
8th Nov 20256211 AMAQI
8th Nov 20257012 PMAQI
8th Nov 2025731 PMAQI
8th Nov 2025702 PMAQI
8th Nov 2025673 PMAQI
8th Nov 2025654 PMAQI
8th Nov 2025635 PMAQI
8th Nov 2025616 PMAQI
8th Nov 2025577 PMAQI
8th Nov 2025568 PMAQI
8th Nov 2025509 PMAQI
8th Nov 20254110 PMAQI
8th Nov 20253711 PMAQI
9th Nov 20254412 AMAQI
9th Nov 2025451 AMAQI
9th Nov 2025472 AMAQI
9th Nov 2025473 AMAQI
9th Nov 2025474 AMAQI
14°C12/16°C
9th Nov 2025455 AMAQI
9th Nov 2025406 AMAQI
9th Nov 2025407 AMAQI
9th Nov 2025448 AMAQI
9th Nov 2025479 AMAQI
9th Nov 20254810 AMAQI
9th Nov 20255011 AMAQI
9th Nov 20255212 PMAQI
9th Nov 2025541 PMAQI
9th Nov 2025562 PMAQI
9th Nov 2025553 PMAQI
9th Nov 2025564 PMAQI
9th Nov 2025605 PMAQI
9th Nov 2025616 PMAQI
9th Nov 2025617 PMAQI
9th Nov 2025638 PMAQI
9th Nov 2025669 PMAQI
9th Nov 20256510 PMAQI
9th Nov 20256311 PMAQI
10th Nov 20256512 AMAQI
10th Nov 2025661 AMAQI
10th Nov 2025662 AMAQI
10th Nov 2025663 AMAQI
10th Nov 2025634 AMAQI
15°C12/17°C
10th Nov 2025615 AMAQI
10th Nov 2025576 AMAQI
10th Nov 2025567 AMAQI
10th Nov 2025568 AMAQI
10th Nov 2025589 AMAQI
10th Nov 20255710 AMAQI
10th Nov 20255411 AMAQI
10th Nov 20253712 PMAQI
10th Nov 2025291 PMAQI
10th Nov 2025322 PMAQI
10th Nov 2025323 PMAQI
10th Nov 2025254 PMAQI
10th Nov 2025235 PMAQI
10th Nov 2025226 PMAQI
10th Nov 2025227 PMAQI
10th Nov 2025228 PMAQI
10th Nov 2025209 PMAQI
10th Nov 20252010 PMAQI
10th Nov 20252011 PMAQI
11th Nov 20252112 AMAQI
11th Nov 2025251 AMAQI
11th Nov 2025252 AMAQI
11th Nov 2025253 AMAQI
11th Nov 2025264 AMAQI
--°C/°C
11th Nov 2025275 AMAQI
5 AM11th Nov 2025266 AMAQI
11th Nov 2025217 AMAQI
11th Nov 2025228 AMAQI
10 AM
4 PM
10 PM
4 AM
--°C/°C
Day time
Avg. Highest Time
9 AM - 2 PM
45AQI
6 hours / Day
180 hours / Month
Avg. Lowest Time
7 AM
39AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 9 AM to 2 PM (Avg. 45), while the lowest AQI was between 7 AM to 7 AM (Avg. 39).
Night time
Avg. Highest Time
7 PM - 11 PM
48AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
5 PM - 6 PM
44AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 11 PM (Avg. 48), while the lowest AQI was between 5 PM to 6 PM (Avg. 44).
2025 Days Vs Air Quality
Koga, Ibaraki, Japan
2025
88%
275
12%
38
Total number of days with different AQI categories in last 314 days in 2025 (51 days remaining)
Good
275 DaysModerate
38 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 314 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
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.
-1th undefined 2025
-1th undefined 2025
-1th undefined 2025
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
4th August 2025
57AQI
57AQI
5th August 2025
49AQI
49AQI
6th August 2025
49AQI
49AQI
7th August 2025
40AQI
40AQI
8th August 2025
38AQI
38AQI
9th August 2025
37AQI
37AQI
10th August 2025
31AQI
31AQI
11th August 2025
34AQI
34AQI
12th August 2025
34AQI
34AQI
13th August 2025
32AQI
32AQI
14th August 2025
32AQI
32AQI
15th August 2025
33AQI
33AQI
16th August 2025
34AQI
34AQI
17th August 2025
38AQI
38AQI
18th August 2025
41AQI
41AQI
19th August 2025
44AQI
44AQI
20th August 2025
48AQI
48AQI
21st August 2025
48AQI
48AQI
22nd August 2025
48AQI
48AQI
23rd August 2025
48AQI
48AQI
24th August 2025
53AQI
53AQI
25th August 2025
53AQI
53AQI
26th August 2025
53AQI
53AQI
27th August 2025
48AQI
48AQI
28th August 2025
45AQI
45AQI
29th August 2025
49AQI
49AQI
30th August 2025
51AQI
51AQI
31st August 2025
51AQI
51AQI
1st September 2025
43AQI
43AQI
2nd September 2025
37AQI
37AQI
3rd September 2025
35AQI
35AQI
4th September 2025
31AQI
31AQI
5th September 2025
27AQI
27AQI
6th September 2025
28AQI
28AQI
7th September 2025
30AQI
30AQI
8th September 2025
34AQI
34AQI
9th September 2025
38AQI
38AQI
10th September 2025
35AQI
35AQI
11th September 2025
29AQI
29AQI
12th September 2025
29AQI
29AQI
13th September 2025
26AQI
26AQI
14th September 2025
31AQI
31AQI
15th September 2025
32AQI
32AQI
16th September 2025
41AQI
41AQI
17th September 2025
44AQI
44AQI
18th September 2025
37AQI
37AQI
19th September 2025
29AQI
29AQI
20th September 2025
28AQI
28AQI
21st September 2025
26AQI
26AQI
22nd September 2025
25AQI
25AQI
23rd September 2025
25AQI
25AQI
24th September 2025
26AQI
26AQI
25th September 2025
42AQI
42AQI
26th September 2025
48AQI
48AQI
27th September 2025
30AQI
30AQI
28th September 2025
32AQI
32AQI
29th September 2025
37AQI
37AQI
30th September 2025
33AQI
33AQI
1st October 2025
35AQI
35AQI
2nd October 2025
41AQI
41AQI
3rd October 2025
48AQI
48AQI
4th October 2025
56AQI
56AQI
5th October 2025
52AQI
52AQI
6th October 2025
55AQI
55AQI
7th October 2025
47AQI
47AQI
8th October 2025
55AQI
55AQI
9th October 2025
55AQI
55AQI
10th October 2025
56AQI
56AQI
11th October 2025
51AQI
51AQI
12th October 2025
43AQI
43AQI
13th October 2025
53AQI
53AQI
14th October 2025
52AQI
52AQI
15th October 2025
49AQI
49AQI
16th October 2025
54AQI
54AQI
17th October 2025
51AQI
51AQI
18th October 2025
53AQI
53AQI
19th October 2025
52AQI
52AQI
20th October 2025
55AQI
55AQI
21st October 2025
49AQI
49AQI
22nd October 2025
43AQI
43AQI
23rd October 2025
41AQI
41AQI
24th October 2025
45AQI
45AQI
25th October 2025
40AQI
40AQI
26th October 2025
31AQI
31AQI
27th October 2025
34AQI
34AQI
28th October 2025
38AQI
38AQI
29th October 2025
39AQI
39AQI
30th October 2025
61AQI
61AQI
31st October 2025
61AQI
61AQI
1st November 2025
29AQI
29AQI
2nd November 2025
40AQI
40AQI
3rd November 2025
40AQI
40AQI
4th November 2025
32AQI
32AQI
5th November 2025
52AQI
52AQI
6th November 2025
46AQI
46AQI
7th November 2025
47AQI
47AQI
8th November 2025
49AQI
49AQI
9th November 2025
52AQI
52AQI
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
35AQI
33AQI
38AQI
33AQI
31AQI
35AQI
45AQI
43AQI
33AQI
48AQI
43AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202538AQI
30
1
28
27
4
29
1
30
1
29
1
25
6
25
6
30
15
16
7
2
275
38
Highest AQI recorded in
October48AQI
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
2025(Avg.)
38AQILeast Polluted Year Recorded
2024(Avg.)
35AQIKoga's annual 2025 AQI (38) shows an average percentage change of 6.5% (worsened AQI) compared to previous years: 2020 (35), 2021 (37), 2022 (35), 2023 (36), 2024 (35).
