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
2022
2023
2024
2025
2026
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
4th Aug 2025
57AQILowest AQI recorded on
30th Aug 2024
11AQISame Day Analysis (1st August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 42 of Good air quality on the same day.
Day & Night AQI Trend: 31st Jul - 1st Aug 2026
Koga, Ibaraki, Japan
AQI
Day
Night
.
4 AM31st Jul 2026
6 PM
3 AM1st Aug 2026
Day time
Avg. Highest Time
11AM31st Jul
64AQI
Avg. Lowest Time
3PM31st Jul
32AQI
Night time
Avg. Highest Time
8PM31st Jul
53AQI
Avg. Lowest Time
1AM1st Aug
25AQI
In the last 24 hours,
Koga's AQI reached its highest point of 64 at 11 AM during the Day, while the lowest point, 25, was recorded at 1 AM during the Night between 31st Jul and 1st Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Koga, Ibaraki, Japan
JulAug
03rd - 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 - 31st31st - 01st01st
Day
Night
3rd Jul 2026124 AMAQI
3rd Jul 202695 AMAQI
3rd Jul 202686 AMAQI
3rd Jul 202677 AMAQI
3rd Jul 202688 AMAQI
3rd Jul 2026129 AMAQI
3rd Jul 20261010 AMAQI
3rd Jul 20261111 AMAQI
3rd Jul 2026812 PMAQI
3rd Jul 2026101 PMAQI
3rd Jul 2026142 PMAQI
3rd Jul 2026243 PMAQI
3rd Jul 2026244 PMAQI
3rd Jul 2026215 PMAQI
3rd Jul 2026256 PMAQI
3rd Jul 2026307 PMAQI
3rd Jul 2026328 PMAQI
3rd Jul 2026369 PMAQI
3rd Jul 20263010 PMAQI
3rd Jul 20263011 PMAQI
4th Jul 20262712 AMAQI
4th Jul 2026281 AMAQI
4th Jul 2026282 AMAQI
4th Jul 2026263 AMAQI
22°C20/25°C
4th Jul 2026254 AMAQI
4th Jul 2026265 AMAQI
4th Jul 2026276 AMAQI
4th Jul 2026287 AMAQI
4th Jul 2026288 AMAQI
4th Jul 2026269 AMAQI
4th Jul 20262610 AMAQI
4th Jul 20262611 AMAQI
4th Jul 20262412 PMAQI
4th Jul 2026251 PMAQI
4th Jul 2026262 PMAQI
4th Jul 2026303 PMAQI
4th Jul 2026284 PMAQI
4th Jul 2026605 PMAQI
4th Jul 2026646 PMAQI
4th Jul 2026527 PMAQI
4th Jul 2026388 PMAQI
4th Jul 2026369 PMAQI
4th Jul 20263310 PMAQI
4th Jul 20262711 PMAQI
5th Jul 20262612 AMAQI
5th Jul 2026261 AMAQI
5th Jul 2026252 AMAQI
5th Jul 2026243 AMAQI
22°C21/26°C
5th Jul 2026224 AMAQI
5th Jul 2026235 AMAQI
5th Jul 2026236 AMAQI
5th Jul 2026247 AMAQI
5th Jul 2026248 AMAQI
5th Jul 2026249 AMAQI
5th Jul 20262410 AMAQI
5th Jul 20261911 AMAQI
5th Jul 20261812 PMAQI
5th Jul 2026201 PMAQI
5th Jul 2026222 PMAQI
5th Jul 2026243 PMAQI
5th Jul 2026244 PMAQI
5th Jul 2026245 PMAQI
5th Jul 2026256 PMAQI
5th Jul 2026247 PMAQI
5th Jul 2026208 PMAQI
5th Jul 2026229 PMAQI
5th Jul 20262310 PMAQI
5th Jul 20262411 PMAQI
6th Jul 20262412 AMAQI
6th Jul 2026261 AMAQI
6th Jul 2026262 AMAQI
6th Jul 2026263 AMAQI
23°C21/25°C
6th Jul 2026224 AMAQI
6th Jul 2026255 AMAQI
6th Jul 2026256 AMAQI
6th Jul 2026227 AMAQI
6th Jul 2026268 AMAQI
6th Jul 2026209 AMAQI
6th Jul 20262810 AMAQI
6th Jul 20263811 AMAQI
6th Jul 20262012 PMAQI
6th Jul 2026201 PMAQI
6th Jul 2026222 PMAQI
6th Jul 2026243 PMAQI
6th Jul 2026234 PMAQI
6th Jul 2026205 PMAQI
6th Jul 2026206 PMAQI
6th Jul 2026227 PMAQI
6th Jul 2026268 PMAQI
6th Jul 2026249 PMAQI
6th Jul 20262510 PMAQI
6th Jul 20262811 PMAQI
7th Jul 20262912 AMAQI
7th Jul 2026281 AMAQI
7th Jul 2026302 AMAQI
7th Jul 2026283 AMAQI
21°C20/23°C
7th Jul 2026264 AMAQI
7th Jul 2026285 AMAQI
7th Jul 2026286 AMAQI
7th Jul 2026267 AMAQI
7th Jul 2026288 AMAQI
7th Jul 2026239 AMAQI
7th Jul 20262610 AMAQI
7th Jul 20262211 AMAQI
7th Jul 20262212 PMAQI
7th Jul 2026221 PMAQI
7th Jul 2026242 PMAQI
7th Jul 2026283 PMAQI
7th Jul 2026264 PMAQI
7th Jul 2026265 PMAQI
7th Jul 2026266 PMAQI
7th Jul 2026177 PMAQI
7th Jul 2026248 PMAQI
7th Jul 2026269 PMAQI
7th Jul 20262410 PMAQI
7th Jul 20262411 PMAQI
8th Jul 20263012 AMAQI
8th Jul 2026291 AMAQI
8th Jul 2026232 AMAQI
8th Jul 2026103 AMAQI
24°C19/29°C
8th Jul 2026104 AMAQI
8th Jul 202695 AMAQI
8th Jul 202696 AMAQI
8th Jul 202697 AMAQI
8th Jul 2026188 AMAQI
8th Jul 2026249 AMAQI
8th Jul 20262410 AMAQI
8th Jul 20262411 AMAQI
8th Jul 20262312 PMAQI
8th Jul 2026241 PMAQI
8th Jul 2026242 PMAQI
8th Jul 2026243 PMAQI
8th Jul 2026264 PMAQI
8th Jul 2026195 PMAQI
8th Jul 2026186 PMAQI
8th Jul 2026187 PMAQI
8th Jul 2026158 PMAQI
8th Jul 2026149 PMAQI
8th Jul 20262210 PMAQI
8th Jul 20261811 PMAQI
9th Jul 20262812 AMAQI
9th Jul 2026271 AMAQI
9th Jul 2026222 AMAQI
9th Jul 202683 AMAQI
25°C21/30°C
9th Jul 2026164 AMAQI
9th Jul 2026175 AMAQI
9th Jul 202686 AMAQI
9th Jul 2026107 AMAQI
9th Jul 2026268 AMAQI
9th Jul 2026229 AMAQI
9th Jul 20261810 AMAQI
9th Jul 20262211 AMAQI
9th Jul 20262212 PMAQI
9th Jul 2026201 PMAQI
9th Jul 2026232 PMAQI
9th Jul 2026263 PMAQI
9th Jul 2026244 PMAQI
9th Jul 2026265 PMAQI
9th Jul 2026286 PMAQI
9th Jul 2026287 PMAQI
9th Jul 2026278 PMAQI
9th Jul 2026269 PMAQI
9th Jul 20262610 PMAQI
9th Jul 20262811 PMAQI
10th Jul 20262512 AMAQI
10th Jul 2026271 AMAQI
10th Jul 2026262 AMAQI
10th Jul 2026253 AMAQI
27°C22/33°C
10th Jul 2026244 AMAQI
10th Jul 2026265 AMAQI
10th Jul 2026276 AMAQI
10th Jul 2026287 AMAQI
10th Jul 2026288 AMAQI
10th Jul 2026229 AMAQI
10th Jul 20262710 AMAQI
10th Jul 20262611 AMAQI
10th Jul 20262812 PMAQI
10th Jul 2026241 PMAQI
10th Jul 2026242 PMAQI
10th Jul 2026243 PMAQI
10th Jul 2026244 PMAQI
10th Jul 2026285 PMAQI
10th Jul 2026306 PMAQI
10th Jul 2026297 PMAQI
10th Jul 2026288 PMAQI
10th Jul 2026299 PMAQI
10th Jul 20262110 PMAQI
10th Jul 20262611 PMAQI
11th Jul 20263012 AMAQI
11th Jul 2026311 AMAQI
11th Jul 2026312 AMAQI
11th Jul 2026203 AMAQI
28°C24/34°C
11th Jul 202684 AMAQI
11th Jul 202685 AMAQI
11th Jul 202686 AMAQI
11th Jul 2026167 AMAQI
11th Jul 2026308 AMAQI
11th Jul 2026309 AMAQI
11th Jul 20263110 AMAQI
11th Jul 20262911 AMAQI
11th Jul 20262912 PMAQI
11th Jul 2026261 PMAQI
11th Jul 2026262 PMAQI
11th Jul 2026243 PMAQI
11th Jul 2026264 PMAQI
11th Jul 2026295 PMAQI
11th Jul 2026286 PMAQI
11th Jul 2026277 PMAQI
11th Jul 2026228 PMAQI
11th Jul 2026159 PMAQI
11th Jul 20262410 PMAQI
11th Jul 20262411 PMAQI
12th Jul 20262312 AMAQI
12th Jul 2026291 AMAQI
12th Jul 2026212 AMAQI
12th Jul 2026203 AMAQI
28°C24/33°C
12th Jul 2026194 AMAQI
12th Jul 2026285 AMAQI
12th Jul 2026246 AMAQI
12th Jul 2026227 AMAQI
12th Jul 2026218 AMAQI
12th Jul 2026289 AMAQI
12th Jul 20262710 AMAQI
12th Jul 20262411 AMAQI
12th Jul 20262212 PMAQI
12th Jul 2026221 PMAQI
12th Jul 2026242 PMAQI
12th Jul 2026243 PMAQI
12th Jul 2026264 PMAQI
12th Jul 2026285 PMAQI
12th Jul 2026306 PMAQI
12th Jul 2026327 PMAQI
12th Jul 2026308 PMAQI
12th Jul 2026289 PMAQI
12th Jul 20263010 PMAQI
12th Jul 20263211 PMAQI
13th Jul 20263012 AMAQI
13th Jul 2026311 AMAQI
13th Jul 2026312 AMAQI
13th Jul 2026303 AMAQI
26°C24/29°C
13th Jul 2026274 AMAQI
13th Jul 2026305 AMAQI
13th Jul 2026286 AMAQI
13th Jul 2026277 AMAQI
13th Jul 2026308 AMAQI
13th Jul 2026309 AMAQI
13th Jul 20262810 AMAQI
13th Jul 20262911 AMAQI
13th Jul 20262912 PMAQI
13th Jul 2026231 PMAQI
13th Jul 2026232 PMAQI
13th Jul 2026303 PMAQI
13th Jul 2026394 PMAQI
13th Jul 2026435 PMAQI
13th Jul 2026446 PMAQI
13th Jul 2026487 PMAQI
13th Jul 2026448 PMAQI
13th Jul 2026449 PMAQI
13th Jul 20264610 PMAQI
13th Jul 20264711 PMAQI
14th Jul 20264612 AMAQI
14th Jul 2026481 AMAQI
14th Jul 2026442 AMAQI
14th Jul 2026343 AMAQI
27°C24/31°C
14th Jul 2026304 AMAQI
14th Jul 2026285 AMAQI
14th Jul 2026336 AMAQI
14th Jul 2026347 AMAQI
14th Jul 2026318 AMAQI
14th Jul 2026369 AMAQI
14th Jul 20264810 AMAQI
14th Jul 20264211 AMAQI
14th Jul 20264812 PMAQI
14th Jul 2026441 PMAQI
14th Jul 2026392 PMAQI
14th Jul 2026393 PMAQI
14th Jul 2026384 PMAQI
14th Jul 2026365 PMAQI
14th Jul 2026326 PMAQI
14th Jul 2026377 PMAQI
14th Jul 2026338 PMAQI
14th Jul 2026449 PMAQI
14th Jul 20263110 PMAQI
14th Jul 20263211 PMAQI
15th Jul 20263212 AMAQI
15th Jul 2026341 AMAQI
15th Jul 2026302 AMAQI
15th Jul 2026323 AMAQI
30°C24/36°C
15th Jul 2026364 AMAQI
15th Jul 2026305 AMAQI
15th Jul 2026286 AMAQI
15th Jul 2026307 AMAQI
15th Jul 2026308 AMAQI
15th Jul 2026309 AMAQI
15th Jul 20263110 AMAQI
15th Jul 20262711 AMAQI
15th Jul 20262812 PMAQI
15th Jul 2026371 PMAQI
15th Jul 2026422 PMAQI
15th Jul 2026363 PMAQI
15th Jul 2026404 PMAQI
15th Jul 2026505 PMAQI
15th Jul 2026466 PMAQI
15th Jul 2026497 PMAQI
15th Jul 2026548 PMAQI
15th Jul 2026419 PMAQI
15th Jul 20263810 PMAQI
15th Jul 20265011 PMAQI
16th Jul 20262812 AMAQI
16th Jul 2026361 AMAQI
16th Jul 2026402 AMAQI
16th Jul 2026413 AMAQI
31°C26/37°C
16th Jul 2026364 AMAQI
16th Jul 2026425 AMAQI
16th Jul 2026526 AMAQI
16th Jul 2026487 AMAQI
16th Jul 2026628 AMAQI
16th Jul 2026509 AMAQI
16th Jul 20265510 AMAQI
16th Jul 20265211 AMAQI
16th Jul 20266312 PMAQI
16th Jul 2026581 PMAQI
16th Jul 2026622 PMAQI
16th Jul 2026563 PMAQI
16th Jul 2026564 PMAQI
16th Jul 2026805 PMAQI
16th Jul 2026726 PMAQI
16th Jul 2026707 PMAQI
16th Jul 2026628 PMAQI
16th Jul 2026549 PMAQI
16th Jul 20265010 PMAQI
16th Jul 20265211 PMAQI
17th Jul 20263712 AMAQI
17th Jul 2026441 AMAQI
17th Jul 2026402 AMAQI
17th Jul 2026373 AMAQI
30°C26/36°C
17th Jul 2026314 AMAQI
17th Jul 2026325 AMAQI
17th Jul 2026396 AMAQI
17th Jul 2026427 AMAQI
17th Jul 2026508 AMAQI
17th Jul 2026549 AMAQI
17th Jul 20265910 AMAQI
17th Jul 20266011 AMAQI
17th Jul 20265912 PMAQI
17th Jul 2026551 PMAQI
17th Jul 2026622 PMAQI
17th Jul 2026543 PMAQI
17th Jul 2026504 PMAQI
17th Jul 2026405 PMAQI
17th Jul 2026366 PMAQI
17th Jul 2026367 PMAQI
17th Jul 2026378 PMAQI
17th Jul 2026389 PMAQI
17th Jul 20263410 PMAQI
17th Jul 20263211 PMAQI
18th Jul 20262912 AMAQI
18th Jul 2026281 AMAQI
18th Jul 2026242 AMAQI
18th Jul 2026253 AMAQI
27°C25/30°C
18th Jul 2026224 AMAQI
18th Jul 2026215 AMAQI
18th Jul 2026236 AMAQI
18th Jul 2026257 AMAQI
18th Jul 2026238 AMAQI
18th Jul 2026239 AMAQI
18th Jul 20262510 AMAQI
18th Jul 20262511 AMAQI
18th Jul 20262912 PMAQI
18th Jul 2026251 PMAQI
18th Jul 2026252 PMAQI
18th Jul 2026253 PMAQI
18th Jul 2026394 PMAQI
18th Jul 2026335 PMAQI
18th Jul 2026256 PMAQI
18th Jul 2026257 PMAQI
18th Jul 2026258 PMAQI
18th Jul 2026299 PMAQI
18th Jul 20262310 PMAQI
18th Jul 20262911 PMAQI
19th Jul 20263212 AMAQI
19th Jul 2026251 AMAQI
19th Jul 2026242 AMAQI
19th Jul 2026303 AMAQI
27°C24/29°C
19th Jul 2026324 AMAQI
19th Jul 2026255 AMAQI
19th Jul 2026236 AMAQI
19th Jul 2026257 AMAQI
19th Jul 2026318 AMAQI
19th Jul 2026279 AMAQI
19th Jul 20262310 AMAQI
19th Jul 20262111 AMAQI
19th Jul 20262612 PMAQI
19th Jul 2026231 PMAQI
19th Jul 2026232 PMAQI
19th Jul 2026253 PMAQI
19th Jul 2026314 PMAQI
19th Jul 2026255 PMAQI
19th Jul 2026286 PMAQI
19th Jul 2026297 PMAQI
19th Jul 2026358 PMAQI
19th Jul 2026409 PMAQI
19th Jul 20264310 PMAQI
19th Jul 20263411 PMAQI
20th Jul 20262712 AMAQI
20th Jul 2026371 AMAQI
20th Jul 2026402 AMAQI
20th Jul 2026363 AMAQI
28°C24/33°C
20th Jul 2026324 AMAQI
20th Jul 2026295 AMAQI
20th Jul 2026306 AMAQI
20th Jul 2026277 AMAQI
20th Jul 2026268 AMAQI
20th Jul 2026349 AMAQI
20th Jul 20263410 AMAQI
20th Jul 20263611 AMAQI
20th Jul 20262912 PMAQI
20th Jul 2026311 PMAQI
20th Jul 2026272 PMAQI
20th Jul 2026313 PMAQI
20th Jul 2026394 PMAQI
20th Jul 2026285 PMAQI
20th Jul 2026216 PMAQI
20th Jul 2026217 PMAQI
20th Jul 2026228 PMAQI
20th Jul 2026269 PMAQI
20th Jul 20263210 PMAQI
20th Jul 20263211 PMAQI
21st Jul 20263012 AMAQI
21st Jul 2026301 AMAQI
21st Jul 2026332 AMAQI
21st Jul 2026333 AMAQI
32°C26/37°C
21st Jul 2026374 AMAQI
21st Jul 2026425 AMAQI
21st Jul 2026346 AMAQI
21st Jul 2026367 AMAQI
21st Jul 2026408 AMAQI
21st Jul 2026379 AMAQI
21st Jul 20263810 AMAQI
21st Jul 20264211 AMAQI
21st Jul 2026511 PMAQI
21st Jul 2026502 PMAQI
21st Jul 2026483 PMAQI
21st Jul 2026504 PMAQI
21st Jul 2026505 PMAQI
21st Jul 2026456 PMAQI
21st Jul 2026917 PMAQI
21st Jul 2026498 PMAQI
21st Jul 2026519 PMAQI
21st Jul 20265410 PMAQI
21st Jul 20265411 PMAQI
22nd Jul 20265312 AMAQI
22nd Jul 2026531 AMAQI
22nd Jul 2026522 AMAQI
22nd Jul 2026533 AMAQI
32°C27/38°C
22nd Jul 2026544 AMAQI
22nd Jul 2026525 AMAQI
22nd Jul 2026566 AMAQI
22nd Jul 2026567 AMAQI
22nd Jul 2026588 AMAQI
22nd Jul 2026569 AMAQI
22nd Jul 20265610 AMAQI
22nd Jul 20265711 AMAQI
22nd Jul 20265912 PMAQI
22nd Jul 2026581 PMAQI
22nd Jul 2026592 PMAQI
22nd Jul 2026603 PMAQI
22nd Jul 2026604 PMAQI
22nd Jul 2026625 PMAQI
22nd Jul 2026626 PMAQI
22nd Jul 2026647 PMAQI
22nd Jul 2026648 PMAQI
22nd Jul 2026659 PMAQI
22nd Jul 20266110 PMAQI
22nd Jul 20264811 PMAQI
23rd Jul 20264112 AMAQI
23rd Jul 2026381 AMAQI
23rd Jul 2026362 AMAQI
23rd Jul 2026383 AMAQI
32°C27/39°C
23rd Jul 2026404 AMAQI
23rd Jul 2026425 AMAQI
23rd Jul 2026426 AMAQI
23rd Jul 2026447 AMAQI
23rd Jul 2026458 AMAQI
23rd Jul 2026549 AMAQI
23rd Jul 20265410 AMAQI
23rd Jul 20265311 AMAQI
23rd Jul 20265412 PMAQI
23rd Jul 2026561 PMAQI
23rd Jul 2026582 PMAQI
23rd Jul 2026583 PMAQI
23rd Jul 2026584 PMAQI
23rd Jul 2026565 PMAQI
23rd Jul 2026486 PMAQI
23rd Jul 2026387 PMAQI
23rd Jul 2026338 PMAQI
23rd Jul 2026329 PMAQI
23rd Jul 20263010 PMAQI
23rd Jul 20262911 PMAQI
24th Jul 20262312 AMAQI
24th Jul 2026221 AMAQI
24th Jul 2026222 AMAQI
24th Jul 2026213 AMAQI
31°C26/38°C
24th Jul 2026224 AMAQI
24th Jul 2026245 AMAQI
24th Jul 2026226 AMAQI
24th Jul 2026227 AMAQI
24th Jul 2026248 AMAQI
24th Jul 2026239 AMAQI
24th Jul 20262410 AMAQI
24th Jul 20262311 AMAQI
24th Jul 20262612 PMAQI
24th Jul 2026321 PMAQI
24th Jul 2026392 PMAQI
24th Jul 2026453 PMAQI
24th Jul 2026474 PMAQI
24th Jul 2026475 PMAQI
24th Jul 2026416 PMAQI
24th Jul 2026397 PMAQI
24th Jul 2026298 PMAQI
24th Jul 2026279 PMAQI
24th Jul 20262810 PMAQI
24th Jul 20262411 PMAQI
25th Jul 20262412 AMAQI
25th Jul 2026211 AMAQI
25th Jul 2026212 AMAQI
25th Jul 2026253 AMAQI
27°C25/33°C
25th Jul 2026244 AMAQI
25th Jul 2026365 AMAQI
25th Jul 2026366 AMAQI
25th Jul 2026367 AMAQI
25th Jul 2026428 AMAQI
25th Jul 2026309 AMAQI
25th Jul 20262210 AMAQI
25th Jul 20262811 AMAQI
25th Jul 20263212 PMAQI
25th Jul 2026371 PMAQI
25th Jul 2026362 PMAQI
25th Jul 2026323 PMAQI
25th Jul 2026294 PMAQI
25th Jul 2026265 PMAQI
25th Jul 2026246 PMAQI
25th Jul 2026247 PMAQI
25th Jul 2026308 PMAQI
25th Jul 2026259 PMAQI
25th Jul 20263010 PMAQI
25th Jul 20263211 PMAQI
26th Jul 20263812 AMAQI
26th Jul 2026301 AMAQI
26th Jul 2026282 AMAQI
26th Jul 2026273 AMAQI
28°C24/34°C
26th Jul 2026274 AMAQI
26th Jul 2026305 AMAQI
26th Jul 2026306 AMAQI
26th Jul 2026297 AMAQI
26th Jul 2026258 AMAQI
26th Jul 2026259 AMAQI
26th Jul 20262310 AMAQI
26th Jul 20262211 AMAQI
26th Jul 20262812 PMAQI
26th Jul 2026291 PMAQI
26th Jul 2026312 PMAQI
26th Jul 2026253 PMAQI
26th Jul 2026254 PMAQI
26th Jul 2026305 PMAQI
26th Jul 2026256 PMAQI
26th Jul 2026237 PMAQI
26th Jul 2026408 PMAQI
26th Jul 2026239 PMAQI
26th Jul 20262510 PMAQI
26th Jul 20262211 PMAQI
27th Jul 20262512 AMAQI
27th Jul 2026291 AMAQI
27th Jul 2026422 AMAQI
27th Jul 2026363 AMAQI
27°C25/32°C
27th Jul 2026404 AMAQI
27th Jul 2026215 AMAQI
27th Jul 2026236 AMAQI
27th Jul 2026227 AMAQI
27th Jul 2026238 AMAQI
27th Jul 2026219 AMAQI
27th Jul 20262110 AMAQI
27th Jul 20262711 AMAQI
27th Jul 20262512 PMAQI
27th Jul 2026221 PMAQI
27th Jul 2026262 PMAQI
27th Jul 2026293 PMAQI
27th Jul 2026234 PMAQI
27th Jul 2026255 PMAQI
27th Jul 2026256 PMAQI
27th Jul 2026317 PMAQI
27th Jul 2026218 PMAQI
27th Jul 2026259 PMAQI
27th Jul 20262510 PMAQI
27th Jul 20262911 PMAQI
28th Jul 20262112 AMAQI
28th Jul 2026251 AMAQI
28th Jul 2026252 AMAQI
28th Jul 2026283 AMAQI
25°C22/31°C
28th Jul 2026254 AMAQI
28th Jul 2026215 AMAQI
28th Jul 2026296 AMAQI
28th Jul 2026257 AMAQI
28th Jul 2026298 AMAQI
28th Jul 2026239 AMAQI
28th Jul 20262710 AMAQI
28th Jul 20262711 AMAQI
28th Jul 20262512 PMAQI
28th Jul 2026271 PMAQI
28th Jul 2026242 PMAQI
28th Jul 2026213 PMAQI
28th Jul 2026224 PMAQI
28th Jul 2026475 PMAQI
28th Jul 2026366 PMAQI
28th Jul 2026427 PMAQI
28th Jul 2026508 PMAQI
28th Jul 2026539 PMAQI
28th Jul 20263910 PMAQI
28th Jul 20263311 PMAQI
29th Jul 20263412 AMAQI
29th Jul 2026421 AMAQI
29th Jul 2026422 AMAQI
29th Jul 2026393 AMAQI
25°C23/30°C
29th Jul 2026374 AMAQI
29th Jul 2026415 AMAQI
29th Jul 2026376 AMAQI
29th Jul 2026377 AMAQI
29th Jul 2026298 AMAQI
29th Jul 2026289 AMAQI
29th Jul 20263110 AMAQI
29th Jul 20263011 AMAQI
29th Jul 20262312 PMAQI
29th Jul 2026301 PMAQI
29th Jul 2026262 PMAQI
29th Jul 2026253 PMAQI
29th Jul 2026254 PMAQI
29th Jul 2026295 PMAQI
29th Jul 2026256 PMAQI
29th Jul 2026257 PMAQI
29th Jul 2026258 PMAQI
29th Jul 2026339 PMAQI
29th Jul 20263410 PMAQI
29th Jul 20262211 PMAQI
30th Jul 20262512 AMAQI
30th Jul 2026211 AMAQI
30th Jul 2026222 AMAQI
30th Jul 2026243 AMAQI
28°C23/34°C
30th Jul 2026214 AMAQI
30th Jul 2026225 AMAQI
30th Jul 2026216 AMAQI
30th Jul 2026237 AMAQI
30th Jul 2026258 AMAQI
30th Jul 2026239 AMAQI
30th Jul 20262110 AMAQI
30th Jul 20262111 AMAQI
30th Jul 20262612 PMAQI
30th Jul 2026271 PMAQI
30th Jul 2026312 PMAQI
30th Jul 2026293 PMAQI
30th Jul 2026244 PMAQI
30th Jul 2026255 PMAQI
30th Jul 2026326 PMAQI
30th Jul 2026317 PMAQI
30th Jul 2026418 PMAQI
30th Jul 2026549 PMAQI
30th Jul 20263710 PMAQI
30th Jul 20265011 PMAQI
31st Jul 20264312 AMAQI
31st Jul 2026521 AMAQI
31st Jul 2026342 AMAQI
31st Jul 2026343 AMAQI
30°C25/36°C
31st Jul 2026464 AMAQI
31st Jul 2026465 AMAQI
31st Jul 2026456 AMAQI
31st Jul 2026337 AMAQI
31st Jul 2026458 AMAQI
31st Jul 2026519 AMAQI
31st Jul 20265410 AMAQI
31st Jul 20266411 AMAQI
31st Jul 20264012 PMAQI
31st Jul 2026491 PMAQI
31st Jul 2026502 PMAQI
31st Jul 2026323 PMAQI
31st Jul 2026454 PMAQI
31st Jul 2026555 PMAQI
31st Jul 2026496 PMAQI
31st Jul 2026517 PMAQI
31st Jul 2026538 PMAQI
31st Jul 2026379 PMAQI
31st Jul 20264310 PMAQI
31st Jul 20264011 PMAQI
1st Aug 20264012 AMAQI
1st Aug 2026251 AMAQI
1st Aug 2026312 AMAQI
1st Aug 2026383 AMAQI
29°C26/33°C
1st Aug 2026294 AMAQI
4 AM1st Aug 2026375 AMAQI
1st Aug 2026376 AMAQI
1st Aug 2026327 AMAQI
1st Aug 2026528 AMAQI
1st Aug 2026519 AMAQI
1st Aug 20265410 AMAQI
1st Aug 20264111 AMAQI
11 AM1st Aug 20264112 PMAQI
1st Aug 2026561 PMAQI
1st Aug 2026432 PMAQI
1st Aug 2026603 PMAQI
1st Aug 2026364 PMAQI
1st Aug 2026325 PMAQI
1st Aug 2026336 PMAQI
6 PM1st Aug 2026327 PMAQI
1st Aug 2026428 PMAQI
1st Aug 2026309 PMAQI
1st Aug 20266210 PMAQI
1st Aug 20266611 PMAQI
11 PM3 AM
30°C25/36°C
Day time
Avg. Highest Time
5 PM
37AQI
1 hours / Day
30 hours / Month
Avg. Lowest Time
4 AM - 5 AM
28AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 PM to 5 PM (Avg. 37), while the lowest AQI was between 4 AM to 5 AM (Avg. 28).
Night time
Avg. Highest Time
7 PM - 11 PM
35AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
3 AM
29AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 11 PM (Avg. 35), while the lowest AQI was between 3 AM to 3 AM (Avg. 29).
2026 Days Vs Air Quality
Koga, Ibaraki, Japan
2026
86%
184
14%
29
Total number of days with different AQI categories in last 213 days in 2026 (152 days remaining)
Good
184 DaysModerate
29 DaysPoor
0 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2026, 86% of 213 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 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
22AQI (US)
22AQI (US)
2nd January 2026
22AQI (US)
22AQI (US)
3rd January 2026
24AQI (US)
24AQI (US)
4th January 2026
21AQI (US)
21AQI (US)
5th January 2026
46AQI (US)
46AQI (US)
6th January 2026
24AQI (US)
24AQI (US)
7th January 2026
39AQI (US)
39AQI (US)
8th January 2026
40AQI (US)
40AQI (US)
9th January 2026
28AQI (US)
28AQI (US)
10th January 2026
42AQI (US)
42AQI (US)
11th January 2026
38AQI (US)
38AQI (US)
12th January 2026
18AQI (US)
18AQI (US)
13th January 2026
38AQI (US)
38AQI (US)
14th January 2026
14AQI (US)
14AQI (US)
15th January 2026
34AQI (US)
34AQI (US)
16th January 2026
46AQI (US)
46AQI (US)
17th January 2026
44AQI (US)
44AQI (US)
18th January 2026
26AQI (US)
26AQI (US)
19th January 2026
42AQI (US)
42AQI (US)
20th January 2026
33AQI (US)
33AQI (US)
21st January 2026
11AQI (US)
11AQI (US)
22nd January 2026
20AQI (US)
20AQI (US)
23rd January 2026
27AQI (US)
27AQI (US)
24th January 2026
40AQI (US)
40AQI (US)
25th January 2026
44AQI (US)
44AQI (US)
26th January 2026
22AQI (US)
22AQI (US)
27th January 2026
34AQI (US)
34AQI (US)
28th January 2026
21AQI (US)
21AQI (US)
29th January 2026
20AQI (US)
20AQI (US)
30th January 2026
36AQI (US)
36AQI (US)
31st January 2026
38AQI (US)
38AQI (US)
1st February 2026
34AQI (US)
34AQI (US)
2nd February 2026
42AQI (US)
42AQI (US)
3rd February 2026
30AQI (US)
30AQI (US)
4th February 2026
40AQI (US)
40AQI (US)
5th February 2026
51AQI (US)
51AQI (US)
6th February 2026
49AQI (US)
49AQI (US)
7th February 2026
18AQI (US)
18AQI (US)
8th February 2026
12AQI (US)
12AQI (US)
9th February 2026
32AQI (US)
32AQI (US)
10th February 2026
41AQI (US)
41AQI (US)
11th February 2026
58AQI (US)
58AQI (US)
12th February 2026
34AQI (US)
34AQI (US)
13th February 2026
41AQI (US)
41AQI (US)
14th February 2026
54AQI (US)
54AQI (US)
15th February 2026
72AQI (US)
72AQI (US)
16th February 2026
48AQI (US)
48AQI (US)
17th February 2026
15AQI (US)
15AQI (US)
18th February 2026
30AQI (US)
30AQI (US)
19th February 2026
27AQI (US)
27AQI (US)
20th February 2026
33AQI (US)
33AQI (US)
21st February 2026
44AQI (US)
44AQI (US)
22nd February 2026
46AQI (US)
46AQI (US)
23rd February 2026
42AQI (US)
42AQI (US)
24th February 2026
37AQI (US)
37AQI (US)
25th February 2026
34AQI (US)
34AQI (US)
26th February 2026
10AQI (US)
10AQI (US)
27th February 2026
30AQI (US)
30AQI (US)
28th February 2026
42AQI (US)
42AQI (US)
1st March 2026
36AQI (US)
36AQI (US)
2nd March 2026
66AQI (US)
66AQI (US)
3rd March 2026
42AQI (US)
42AQI (US)
4th March 2026
58AQI (US)
58AQI (US)
5th March 2026
60AQI (US)
60AQI (US)
6th March 2026
53AQI (US)
53AQI (US)
7th March 2026
46AQI (US)
46AQI (US)
8th March 2026
42AQI (US)
42AQI (US)
9th March 2026
45AQI (US)
45AQI (US)
10th March 2026
59AQI (US)
59AQI (US)
11th March 2026
60AQI (US)
60AQI (US)
12th March 2026
66AQI (US)
66AQI (US)
13th March 2026
40AQI (US)
40AQI (US)
14th March 2026
32AQI (US)
32AQI (US)
15th March 2026
14AQI (US)
14AQI (US)
16th March 2026
30AQI (US)
30AQI (US)
17th March 2026
54AQI (US)
54AQI (US)
18th March 2026
57AQI (US)
57AQI (US)
19th March 2026
42AQI (US)
42AQI (US)
20th March 2026
32AQI (US)
32AQI (US)
21st March 2026
50AQI (US)
50AQI (US)
22nd March 2026
51AQI (US)
51AQI (US)
23rd March 2026
51AQI (US)
51AQI (US)
24th March 2026
44AQI (US)
44AQI (US)
25th March 2026
67AQI (US)
67AQI (US)
26th March 2026
25AQI (US)
25AQI (US)
27th March 2026
18AQI (US)
18AQI (US)
28th March 2026
48AQI (US)
48AQI (US)
29th March 2026
52AQI (US)
52AQI (US)
30th March 2026
57AQI (US)
57AQI (US)
31st March 2026
28AQI (US)
28AQI (US)
1st April 2026
17AQI (US)
17AQI (US)
2nd April 2026
23AQI (US)
23AQI (US)
3rd April 2026
46AQI (US)
46AQI (US)
4th April 2026
52AQI (US)
52AQI (US)
5th April 2026
34AQI (US)
34AQI (US)
6th April 2026
20AQI (US)
20AQI (US)
7th April 2026
40AQI (US)
40AQI (US)
8th April 2026
22AQI (US)
22AQI (US)
9th April 2026
34AQI (US)
34AQI (US)
10th April 2026
44AQI (US)
44AQI (US)
11th April 2026
36AQI (US)
36AQI (US)
12th April 2026
30AQI (US)
30AQI (US)
13th April 2026
32AQI (US)
32AQI (US)
14th April 2026
37AQI (US)
37AQI (US)
15th April 2026
36AQI (US)
36AQI (US)
16th April 2026
32AQI (US)
32AQI (US)
17th April 2026
34AQI (US)
34AQI (US)
18th April 2026
32AQI (US)
32AQI (US)
19th April 2026
32AQI (US)
32AQI (US)
20th April 2026
34AQI (US)
34AQI (US)
21st April 2026
38AQI (US)
38AQI (US)
22nd April 2026
46AQI (US)
46AQI (US)
23rd April 2026
35AQI (US)
35AQI (US)
24th April 2026
31AQI (US)
31AQI (US)
25th April 2026
44AQI (US)
44AQI (US)
26th April 2026
50AQI (US)
50AQI (US)
27th April 2026
48AQI (US)
48AQI (US)
28th April 2026
42AQI (US)
42AQI (US)
29th April 2026
38AQI (US)
38AQI (US)
30th April 2026
38AQI (US)
38AQI (US)
1st May 2026
47AQI (US)
47AQI (US)
2nd May 2026
50AQI (US)
50AQI (US)
3rd May 2026
47AQI (US)
47AQI (US)
4th May 2026
27AQI (US)
27AQI (US)
5th May 2026
22AQI (US)
22AQI (US)
6th May 2026
30AQI (US)
30AQI (US)
7th May 2026
30AQI (US)
30AQI (US)
8th May 2026
24AQI (US)
24AQI (US)
9th May 2026
24AQI (US)
24AQI (US)
10th May 2026
27AQI (US)
27AQI (US)
11th May 2026
28AQI (US)
28AQI (US)
12th May 2026
34AQI (US)
34AQI (US)
13th May 2026
37AQI (US)
37AQI (US)
14th May 2026
32AQI (US)
32AQI (US)
15th May 2026
34AQI (US)
34AQI (US)
16th May 2026
86AQI (US)
86AQI (US)
17th May 2026
68AQI (US)
68AQI (US)
18th May 2026
53AQI (US)
53AQI (US)
19th May 2026
49AQI (US)
49AQI (US)
20th May 2026
62AQI (US)
62AQI (US)
21st May 2026
59AQI (US)
59AQI (US)
22nd May 2026
60AQI (US)
60AQI (US)
23rd May 2026
52AQI (US)
52AQI (US)
24th May 2026
58AQI (US)
58AQI (US)
25th May 2026
48AQI (US)
48AQI (US)
26th May 2026
40AQI (US)
40AQI (US)
27th May 2026
24AQI (US)
24AQI (US)
28th May 2026
20AQI (US)
20AQI (US)
29th May 2026
24AQI (US)
24AQI (US)
30th May 2026
24AQI (US)
24AQI (US)
31st May 2026
25AQI (US)
25AQI (US)
1st June 2026
29AQI (US)
29AQI (US)
2nd June 2026
28AQI (US)
28AQI (US)
3rd June 2026
16AQI (US)
16AQI (US)
4th June 2026
22AQI (US)
22AQI (US)
5th June 2026
21AQI (US)
21AQI (US)
6th June 2026
19AQI (US)
19AQI (US)
7th June 2026
20AQI (US)
20AQI (US)
8th June 2026
20AQI (US)
20AQI (US)
9th June 2026
22AQI (US)
22AQI (US)
10th June 2026
22AQI (US)
22AQI (US)
11th June 2026
24AQI (US)
24AQI (US)
12th June 2026
22AQI (US)
22AQI (US)
13th June 2026
26AQI (US)
26AQI (US)
14th June 2026
48AQI (US)
48AQI (US)
15th June 2026
16AQI (US)
16AQI (US)
16th June 2026
18AQI (US)
18AQI (US)
17th June 2026
24AQI (US)
24AQI (US)
18th June 2026
24AQI (US)
24AQI (US)
19th June 2026
27AQI (US)
27AQI (US)
20th June 2026
22AQI (US)
22AQI (US)
21st June 2026
19AQI (US)
19AQI (US)
22nd June 2026
19AQI (US)
19AQI (US)
23rd June 2026
21AQI (US)
21AQI (US)
24th June 2026
22AQI (US)
22AQI (US)
25th June 2026
26AQI (US)
26AQI (US)
26th June 2026
29AQI (US)
29AQI (US)
27th June 2026
26AQI (US)
26AQI (US)
28th June 2026
26AQI (US)
26AQI (US)
29th June 2026
25AQI (US)
25AQI (US)
30th June 2026
24AQI (US)
24AQI (US)
1st July 2026
26AQI (US)
26AQI (US)
2nd July 2026
18AQI (US)
18AQI (US)
3rd July 2026
16AQI (US)
16AQI (US)
4th July 2026
32AQI (US)
32AQI (US)
5th July 2026
23AQI (US)
23AQI (US)
6th July 2026
24AQI (US)
24AQI (US)
7th July 2026
26AQI (US)
26AQI (US)
8th July 2026
20AQI (US)
20AQI (US)
9th July 2026
22AQI (US)
22AQI (US)
10th July 2026
26AQI (US)
26AQI (US)
11th July 2026
24AQI (US)
24AQI (US)
12th July 2026
26AQI (US)
26AQI (US)
13th July 2026
34AQI (US)
34AQI (US)
14th July 2026
38AQI (US)
38AQI (US)
15th July 2026
36AQI (US)
36AQI (US)
16th July 2026
53AQI (US)
53AQI (US)
17th July 2026
44AQI (US)
44AQI (US)
18th July 2026
26AQI (US)
26AQI (US)
19th July 2026
28AQI (US)
28AQI (US)
20th July 2026
30AQI (US)
30AQI (US)
21st July 2026
44AQI (US)
44AQI (US)
22nd July 2026
58AQI (US)
58AQI (US)
23rd July 2026
45AQI (US)
45AQI (US)
24th July 2026
29AQI (US)
29AQI (US)
25th July 2026
29AQI (US)
29AQI (US)
26th July 2026
28AQI (US)
28AQI (US)
27th July 2026
26AQI (US)
26AQI (US)
28th July 2026
30AQI (US)
30AQI (US)
29th July 2026
32AQI (US)
32AQI (US)
30th July 2026
28AQI (US)
28AQI (US)
31st July 2026
46AQI (US)
46AQI (US)
1st August 2026
42AQI (US)
42AQI (US)
2nd August 2026
3rd August 2026
4th August 2026
5th August 2026
6th August 2026
7th August 2026
8th August 2026
9th August 2026
10th August 2026
11th August 2026
12th August 2026
13th August 2026
14th August 2026
15th August 2026
16th August 2026
17th August 2026
18th August 2026
19th August 2026
20th August 2026
21st August 2026
22nd August 2026
23rd August 2026
24th August 2026
25th August 2026
26th August 2026
27th August 2026
28th August 2026
29th August 2026
30th August 2026
31st August 2026
1st September 2026
2nd September 2026
3rd September 2026
4th September 2026
5th September 2026
6th September 2026
7th September 2026
8th September 2026
9th September 2026
10th September 2026
11th September 2026
12th September 2026
13th September 2026
14th September 2026
15th September 2026
16th September 2026
17th September 2026
18th September 2026
19th September 2026
20th September 2026
21st September 2026
22nd September 2026
23rd September 2026
24th September 2026
25th September 2026
26th September 2026
27th September 2026
28th September 2026
29th September 2026
30th September 2026
1st October 2026
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
31AQI (US)
37AQI (US)
46AQI (US)
36AQI (US)
40AQI (US)
24AQI (US)
31AQI (US)
42AQI (US)
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202635AQI (US)
31
24
4
17
14
29
1
23
8
30
29
2
1
184
29
Highest AQI (US) recorded in
March46AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202539AQI (US)
30
1
28
27
4
29
1
30
1
29
1
25
6
25
6
30
15
16
16
14
17
14
301
64
Highest AQI (US) recorded in
October48AQI (US)
Lowest AQI (US) recorded in
May31AQI (US)
202435AQI (US)
30
1
25
4
29
2
27
3
28
3
28
2
24
7
31
29
1
30
1
30
30
1
341
25
Highest AQI (US) recorded in
July43AQI (US)
Lowest AQI (US) recorded in
August26AQI (US)
202336AQI (US)
27
4
26
2
29
2
28
2
30
1
25
5
27
4
31
30
31
25
4
28
3
337
27
Highest AQI (US) recorded in
July41AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202235AQI (US)
24
6
21
27
4
16
1
28
3
27
3
18
3
1
28
31
28
2
31
280
22
Highest AQI (US) recorded in
January39AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
202137AQI (US)
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 (US) recorded in
December43AQI (US)
Lowest AQI (US) recorded in
September33AQI (US)
202035AQI (US)
11
2
19
2
17
1
25
5
31
24
7
19
28
3
17
13
22
9
213
42
Highest AQI (US) recorded in
November45AQI (US)
Lowest AQI (US) recorded in
September26AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Most Polluted Year Recorded
2025(Avg.)
39AQI (US)Least Polluted Year Recorded
2020(Avg.)
35AQI (US)Koga's annual 2026 AQI (US) (35) shows an average percentage change of -3.07% (improved AQI (US)) compared to previous years: 2020 (35), 2021 (37), 2022 (35), 2023 (36), 2024 (35), 2025 (39).
