Katsuura, Chiba, 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
Katsuura, Chiba, Japan
2021
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
28th Aug 2021
63AQILowest AQI recorded on
5th Aug 2021
9AQISame Day Analysis (9th August ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 47 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 10th Aug - 11th Aug 2025
Katsuura, Chiba, Japan
AQI
Day
Night
.
4 AM10th Aug 2025
6 PM
3 AM11th Aug 2025
Day time
Avg. Highest Time
6AM10th Aug
48AQI
Avg. Lowest Time
12PM10th Aug
22AQI
Night time
Avg. Highest Time
2AM11th Aug
48AQI
Avg. Lowest Time
7PM10th Aug
28AQI
In the last 24 hours,
Katsuura's AQI reached its highest point of 48 at 6 AM during the Day, while the lowest point, 22, was recorded at 12 PM during the Day between 10th Aug and 11th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Katsuura, Chiba, Japan
JulAug
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 Jul 2025634 AMAQI
12th Jul 2025615 AMAQI
12th Jul 2025606 AMAQI
12th Jul 2025607 AMAQI
12th Jul 2025608 AMAQI
12th Jul 2025419 AMAQI
12th Jul 20254110 AMAQI
12th Jul 20255011 AMAQI
12th Jul 20254512 PMAQI
12th Jul 2025381 PMAQI
12th Jul 2025432 PMAQI
12th Jul 2025423 PMAQI
12th Jul 2025384 PMAQI
12th Jul 2025395 PMAQI
12th Jul 2025376 PMAQI
12th Jul 2025407 PMAQI
12th Jul 2025448 PMAQI
12th Jul 2025579 PMAQI
12th Jul 20255710 PMAQI
12th Jul 20255711 PMAQI
13th Jul 20255712 AMAQI
13th Jul 2025601 AMAQI
13th Jul 2025602 AMAQI
13th Jul 2025613 AMAQI
23°C22/25°C
13th Jul 2025604 AMAQI
13th Jul 2025595 AMAQI
13th Jul 2025596 AMAQI
13th Jul 2025597 AMAQI
13th Jul 2025588 AMAQI
13th Jul 2025549 AMAQI
13th Jul 20254210 AMAQI
13th Jul 20254011 AMAQI
13th Jul 20253012 PMAQI
13th Jul 2025341 PMAQI
13th Jul 2025352 PMAQI
13th Jul 2025343 PMAQI
13th Jul 2025364 PMAQI
13th Jul 2025295 PMAQI
13th Jul 2025336 PMAQI
13th Jul 2025337 PMAQI
13th Jul 2025378 PMAQI
13th Jul 2025539 PMAQI
13th Jul 20255310 PMAQI
13th Jul 20255411 PMAQI
14th Jul 20255312 AMAQI
14th Jul 2025551 AMAQI
14th Jul 2025562 AMAQI
14th Jul 2025583 AMAQI
26°C24/27°C
14th Jul 2025584 AMAQI
14th Jul 2025575 AMAQI
14th Jul 2025576 AMAQI
14th Jul 2025567 AMAQI
14th Jul 2025568 AMAQI
14th Jul 2025339 AMAQI
14th Jul 20252110 AMAQI
14th Jul 20251811 AMAQI
14th Jul 20252012 PMAQI
14th Jul 2025281 PMAQI
14th Jul 2025322 PMAQI
14th Jul 2025283 PMAQI
14th Jul 2025254 PMAQI
14th Jul 2025265 PMAQI
14th Jul 2025246 PMAQI
14th Jul 2025247 PMAQI
14th Jul 2025318 PMAQI
14th Jul 2025489 PMAQI
14th Jul 20254810 PMAQI
14th Jul 20254711 PMAQI
15th Jul 20254912 AMAQI
15th Jul 2025521 AMAQI
15th Jul 2025542 AMAQI
15th Jul 2025553 AMAQI
26°C24/28°C
15th Jul 2025554 AMAQI
15th Jul 2025535 AMAQI
15th Jul 2025536 AMAQI
15th Jul 2025527 AMAQI
15th Jul 2025528 AMAQI
15th Jul 2025269 AMAQI
15th Jul 20251810 AMAQI
15th Jul 20252511 AMAQI
15th Jul 20252312 PMAQI
15th Jul 2025291 PMAQI
15th Jul 2025362 PMAQI
15th Jul 2025463 PMAQI
15th Jul 2025444 PMAQI
15th Jul 2025385 PMAQI
15th Jul 2025376 PMAQI
15th Jul 2025347 PMAQI
15th Jul 2025358 PMAQI
15th Jul 2025469 PMAQI
15th Jul 20254510 PMAQI
15th Jul 20254511 PMAQI
16th Jul 20254912 AMAQI
16th Jul 2025501 AMAQI
16th Jul 2025522 AMAQI
16th Jul 2025523 AMAQI
26°C25/27°C
16th Jul 2025524 AMAQI
16th Jul 2025485 AMAQI
16th Jul 2025506 AMAQI
16th Jul 2025507 AMAQI
16th Jul 2025508 AMAQI
16th Jul 2025389 AMAQI
16th Jul 20252910 AMAQI
16th Jul 20252811 AMAQI
16th Jul 20252312 PMAQI
16th Jul 2025361 PMAQI
16th Jul 2025382 PMAQI
16th Jul 2025483 PMAQI
16th Jul 2025394 PMAQI
16th Jul 2025285 PMAQI
16th Jul 2025326 PMAQI
16th Jul 2025347 PMAQI
16th Jul 2025288 PMAQI
16th Jul 2025419 PMAQI
16th Jul 20253910 PMAQI
16th Jul 20254211 PMAQI
17th Jul 20254412 AMAQI
17th Jul 2025471 AMAQI
17th Jul 2025512 AMAQI
17th Jul 2025513 AMAQI
26°C25/26°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 20252511 AMAQI
17th Jul 20252412 PMAQI
17th Jul 2025341 PMAQI
17th Jul 2025302 PMAQI
17th Jul 2025303 PMAQI
17th Jul 2025364 PMAQI
17th Jul 2025265 PMAQI
17th Jul 2025346 PMAQI
17th Jul 2025367 PMAQI
17th Jul 2025348 PMAQI
17th Jul 2025449 PMAQI
17th Jul 20254310 PMAQI
17th Jul 20254311 PMAQI
18th Jul 20254212 AMAQI
18th Jul 2025461 AMAQI
18th Jul 2025492 AMAQI
18th Jul 2025503 AMAQI
27°C26/28°C
18th Jul 2025484 AMAQI
18th Jul 2025475 AMAQI
18th Jul 2025466 AMAQI
18th Jul 2025467 AMAQI
18th Jul 2025478 AMAQI
18th Jul 2025279 AMAQI
18th Jul 20252310 AMAQI
18th Jul 20252311 AMAQI
18th Jul 20252212 PMAQI
18th Jul 2025321 PMAQI
18th Jul 2025312 PMAQI
18th Jul 2025293 PMAQI
18th Jul 2025284 PMAQI
18th Jul 2025325 PMAQI
18th Jul 2025316 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 2025431 AMAQI
19th Jul 2025462 AMAQI
19th Jul 2025473 AMAQI
26°C25/28°C
19th Jul 2025464 AMAQI
19th Jul 2025435 AMAQI
19th Jul 2025436 AMAQI
19th Jul 2025447 AMAQI
19th Jul 2025438 AMAQI
19th Jul 2025269 AMAQI
19th Jul 20252110 AMAQI
19th Jul 20252511 AMAQI
19th Jul 20252212 PMAQI
19th Jul 2025231 PMAQI
19th Jul 2025242 PMAQI
19th Jul 2025243 PMAQI
19th Jul 2025224 PMAQI
19th Jul 2025215 PMAQI
19th Jul 2025236 PMAQI
19th Jul 2025307 PMAQI
19th Jul 2025278 PMAQI
19th Jul 2025349 PMAQI
19th Jul 20253310 PMAQI
19th Jul 20253311 PMAQI
20th Jul 20253412 AMAQI
20th Jul 2025381 AMAQI
20th Jul 2025432 AMAQI
20th Jul 2025443 AMAQI
27°C25/28°C
20th Jul 2025424 AMAQI
20th Jul 2025415 AMAQI
20th Jul 2025416 AMAQI
20th Jul 2025407 AMAQI
20th Jul 2025418 AMAQI
20th Jul 2025299 AMAQI
20th Jul 20252110 AMAQI
20th Jul 20252411 AMAQI
20th Jul 20252512 PMAQI
20th Jul 2025221 PMAQI
20th Jul 2025192 PMAQI
20th Jul 2025193 PMAQI
20th Jul 2025184 PMAQI
20th Jul 2025225 PMAQI
20th Jul 2025256 PMAQI
20th Jul 2025267 PMAQI
20th Jul 2025278 PMAQI
20th Jul 2025349 PMAQI
20th Jul 20253510 PMAQI
20th Jul 20253311 PMAQI
21st Jul 20253212 AMAQI
21st Jul 2025331 AMAQI
21st Jul 2025402 AMAQI
21st Jul 2025413 AMAQI
27°C26/28°C
21st Jul 2025394 AMAQI
21st Jul 2025375 AMAQI
21st Jul 2025376 AMAQI
21st Jul 2025377 AMAQI
21st Jul 2025378 AMAQI
21st Jul 2025259 AMAQI
21st Jul 20252010 AMAQI
21st Jul 20252811 AMAQI
21st Jul 20253612 PMAQI
21st Jul 2025341 PMAQI
21st Jul 2025332 PMAQI
21st Jul 2025313 PMAQI
21st Jul 2025334 PMAQI
21st Jul 2025355 PMAQI
21st Jul 2025266 PMAQI
21st Jul 2025227 PMAQI
21st Jul 2025268 PMAQI
21st Jul 2025339 PMAQI
21st Jul 20253310 PMAQI
21st Jul 20253011 PMAQI
22nd Jul 20252812 AMAQI
22nd Jul 2025341 AMAQI
22nd Jul 2025382 AMAQI
22nd Jul 2025383 AMAQI
27°C26/29°C
22nd Jul 2025384 AMAQI
22nd Jul 2025355 AMAQI
22nd Jul 2025366 AMAQI
22nd Jul 2025357 AMAQI
22nd Jul 2025368 AMAQI
22nd Jul 2025259 AMAQI
22nd Jul 20252210 AMAQI
22nd Jul 20252711 AMAQI
22nd Jul 20253212 PMAQI
22nd Jul 2025301 PMAQI
22nd Jul 2025282 PMAQI
22nd Jul 2025333 PMAQI
22nd Jul 2025304 PMAQI
22nd Jul 2025265 PMAQI
22nd Jul 2025216 PMAQI
22nd Jul 2025207 PMAQI
22nd Jul 2025228 PMAQI
22nd Jul 2025349 PMAQI
22nd Jul 20253310 PMAQI
22nd Jul 20252911 PMAQI
23rd Jul 20252712 AMAQI
23rd Jul 2025281 AMAQI
23rd Jul 2025332 AMAQI
23rd Jul 2025353 AMAQI
27°C26/29°C
23rd Jul 2025354 AMAQI
23rd Jul 2025345 AMAQI
23rd Jul 2025346 AMAQI
23rd Jul 2025347 AMAQI
23rd Jul 2025348 AMAQI
23rd Jul 2025249 AMAQI
23rd Jul 20252210 AMAQI
23rd Jul 20252811 AMAQI
23rd Jul 20252812 PMAQI
23rd Jul 2025331 PMAQI
23rd Jul 2025322 PMAQI
23rd Jul 2025393 PMAQI
23rd Jul 2025394 PMAQI
23rd Jul 2025345 PMAQI
23rd Jul 2025266 PMAQI
23rd Jul 2025247 PMAQI
23rd Jul 2025268 PMAQI
23rd Jul 2025339 PMAQI
23rd Jul 20253510 PMAQI
23rd Jul 20253411 PMAQI
24th Jul 20253212 AMAQI
24th Jul 2025321 AMAQI
24th Jul 2025302 AMAQI
24th Jul 2025323 AMAQI
27°C26/29°C
24th Jul 2025324 AMAQI
24th Jul 2025325 AMAQI
24th Jul 2025316 AMAQI
24th Jul 2025317 AMAQI
24th Jul 2025318 AMAQI
24th Jul 2025279 AMAQI
24th Jul 20252910 AMAQI
24th Jul 20253311 AMAQI
24th Jul 20254312 PMAQI
24th Jul 2025401 PMAQI
24th Jul 2025352 PMAQI
24th Jul 2025323 PMAQI
24th Jul 2025304 PMAQI
24th Jul 2025275 PMAQI
24th Jul 2025286 PMAQI
24th Jul 2025287 PMAQI
24th Jul 2025328 PMAQI
24th Jul 2025299 PMAQI
24th Jul 20252810 PMAQI
24th Jul 20252711 PMAQI
25th Jul 20252712 AMAQI
25th Jul 2025301 AMAQI
25th Jul 2025322 AMAQI
25th Jul 2025303 AMAQI
27°C26/30°C
25th Jul 2025314 AMAQI
25th Jul 2025325 AMAQI
25th Jul 2025306 AMAQI
25th Jul 2025327 AMAQI
25th Jul 2025328 AMAQI
25th Jul 2025209 AMAQI
25th Jul 20252010 AMAQI
25th Jul 20252311 AMAQI
25th Jul 20252412 PMAQI
25th Jul 2025221 PMAQI
25th Jul 2025212 PMAQI
25th Jul 2025223 PMAQI
25th Jul 2025244 PMAQI
25th Jul 2025195 PMAQI
25th Jul 2025186 PMAQI
25th Jul 2025197 PMAQI
25th Jul 2025198 PMAQI
25th Jul 2025249 PMAQI
25th Jul 20252410 PMAQI
25th Jul 20252511 PMAQI
26th Jul 20252412 AMAQI
26th Jul 2025281 AMAQI
26th Jul 2025292 AMAQI
26th Jul 2025293 AMAQI
28°C26/30°C
26th Jul 2025284 AMAQI
26th Jul 2025285 AMAQI
26th Jul 2025286 AMAQI
26th Jul 2025287 AMAQI
26th Jul 2025288 AMAQI
26th Jul 2025209 AMAQI
26th Jul 20252010 AMAQI
26th Jul 20252511 AMAQI
26th Jul 20253112 PMAQI
26th Jul 2025261 PMAQI
26th Jul 2025242 PMAQI
26th Jul 2025233 PMAQI
26th Jul 2025244 PMAQI
26th Jul 2025225 PMAQI
26th Jul 2025216 PMAQI
26th Jul 2025227 PMAQI
26th Jul 2025258 PMAQI
26th Jul 2025269 PMAQI
26th Jul 20252810 PMAQI
26th Jul 20252511 PMAQI
27th Jul 20252512 AMAQI
27th Jul 2025261 AMAQI
27th Jul 2025282 AMAQI
27th Jul 2025283 AMAQI
28°C26/30°C
27th Jul 2025284 AMAQI
27th Jul 2025285 AMAQI
27th Jul 2025286 AMAQI
27th Jul 2025287 AMAQI
27th Jul 2025278 AMAQI
27th Jul 2025229 AMAQI
27th Jul 20251810 AMAQI
27th Jul 20252211 AMAQI
27th Jul 20252012 PMAQI
27th Jul 2025201 PMAQI
27th Jul 2025182 PMAQI
27th Jul 2025203 PMAQI
27th Jul 2025224 PMAQI
27th Jul 2025225 PMAQI
27th Jul 2025176 PMAQI
27th Jul 2025187 PMAQI
27th Jul 2025198 PMAQI
27th Jul 2025239 PMAQI
27th Jul 20252210 PMAQI
27th Jul 20252311 PMAQI
28th Jul 20252812 AMAQI
28th Jul 2025261 AMAQI
28th Jul 2025282 AMAQI
28th Jul 2025283 AMAQI
27°C26/29°C
28th Jul 2025284 AMAQI
28th Jul 2025265 AMAQI
28th Jul 2025266 AMAQI
28th Jul 2025267 AMAQI
28th Jul 2025268 AMAQI
28th Jul 2025249 AMAQI
28th Jul 20252310 AMAQI
28th Jul 20252511 AMAQI
28th Jul 20252712 PMAQI
28th Jul 2025341 PMAQI
28th Jul 2025372 PMAQI
28th Jul 2025253 PMAQI
28th Jul 2025244 PMAQI
28th Jul 2025285 PMAQI
28th Jul 2025236 PMAQI
28th Jul 2025227 PMAQI
28th Jul 2025248 PMAQI
28th Jul 2025249 PMAQI
28th Jul 20252410 PMAQI
28th Jul 20252411 PMAQI
29th Jul 20252612 AMAQI
29th Jul 2025281 AMAQI
29th Jul 2025282 AMAQI
29th Jul 2025273 AMAQI
27°C25/29°C
29th Jul 2025274 AMAQI
29th Jul 2025275 AMAQI
29th Jul 2025276 AMAQI
29th Jul 2025277 AMAQI
29th Jul 2025288 AMAQI
29th Jul 2025269 AMAQI
29th Jul 20252910 AMAQI
29th Jul 20253011 AMAQI
29th Jul 20253012 PMAQI
29th Jul 2025301 PMAQI
29th Jul 2025262 PMAQI
29th Jul 2025243 PMAQI
29th Jul 2025334 PMAQI
29th Jul 2025365 PMAQI
29th Jul 2025226 PMAQI
29th Jul 2025207 PMAQI
29th Jul 2025238 PMAQI
29th Jul 2025259 PMAQI
29th Jul 20252510 PMAQI
29th Jul 20252511 PMAQI
30th Jul 20252512 AMAQI
30th Jul 2025291 AMAQI
30th Jul 2025262 AMAQI
30th Jul 2025273 AMAQI
27°C25/29°C
30th Jul 2025284 AMAQI
30th Jul 2025295 AMAQI
30th Jul 2025296 AMAQI
30th Jul 2025297 AMAQI
30th Jul 2025298 AMAQI
30th Jul 2025249 AMAQI
30th Jul 20252110 AMAQI
30th Jul 20252211 AMAQI
30th Jul 20252312 PMAQI
30th Jul 2025261 PMAQI
30th Jul 2025322 PMAQI
30th Jul 2025303 PMAQI
30th Jul 2025354 PMAQI
30th Jul 2025345 PMAQI
30th Jul 2025326 PMAQI
30th Jul 2025327 PMAQI
30th Jul 2025358 PMAQI
30th Jul 2025429 PMAQI
30th Jul 20254210 PMAQI
30th Jul 20254111 PMAQI
31st Jul 20253612 AMAQI
31st Jul 2025291 AMAQI
31st Jul 2025272 AMAQI
31st Jul 2025283 AMAQI
27°C24/29°C
31st Jul 2025274 AMAQI
31st Jul 2025275 AMAQI
31st Jul 2025276 AMAQI
31st Jul 2025277 AMAQI
31st Jul 2025278 AMAQI
31st Jul 2025279 AMAQI
31st Jul 20252710 AMAQI
31st Jul 20254211 AMAQI
31st Jul 20254412 PMAQI
31st Jul 2025391 PMAQI
31st Jul 2025382 PMAQI
31st Jul 2025343 PMAQI
31st Jul 2025284 PMAQI
31st Jul 2025325 PMAQI
31st Jul 2025366 PMAQI
31st Jul 2025267 PMAQI
31st Jul 2025308 PMAQI
31st Jul 2025339 PMAQI
31st Jul 20253410 PMAQI
31st Jul 20252911 PMAQI
1st Aug 20253312 AMAQI
1st Aug 2025321 AMAQI
1st Aug 2025292 AMAQI
1st Aug 2025303 AMAQI
26°C24/28°C
1st Aug 2025334 AMAQI
1st Aug 2025325 AMAQI
1st Aug 2025336 AMAQI
1st Aug 2025347 AMAQI
1st Aug 2025348 AMAQI
1st Aug 2025349 AMAQI
1st Aug 20252610 AMAQI
1st Aug 20253911 AMAQI
1st Aug 20255012 PMAQI
1st Aug 2025541 PMAQI
1st Aug 2025402 PMAQI
1st Aug 2025313 PMAQI
1st Aug 2025454 PMAQI
1st Aug 2025365 PMAQI
1st Aug 2025586 PMAQI
1st Aug 2025307 PMAQI
1st Aug 2025308 PMAQI
1st Aug 2025319 PMAQI
1st Aug 20253910 PMAQI
1st Aug 20253711 PMAQI
2nd Aug 20252912 AMAQI
2nd Aug 2025301 AMAQI
2nd Aug 2025332 AMAQI
2nd Aug 2025343 AMAQI
26°C24/27°C
2nd Aug 2025374 AMAQI
2nd Aug 2025375 AMAQI
2nd Aug 2025396 AMAQI
2nd Aug 2025387 AMAQI
2nd Aug 2025388 AMAQI
2nd Aug 2025389 AMAQI
2nd Aug 20253110 AMAQI
2nd Aug 20253611 AMAQI
2nd Aug 20253112 PMAQI
2nd Aug 2025381 PMAQI
2nd Aug 2025522 PMAQI
2nd Aug 2025523 PMAQI
2nd Aug 2025484 PMAQI
2nd Aug 2025485 PMAQI
2nd Aug 2025496 PMAQI
2nd Aug 2025507 PMAQI
2nd Aug 2025408 PMAQI
2nd Aug 2025389 PMAQI
2nd Aug 20253510 PMAQI
2nd Aug 20253811 PMAQI
3rd Aug 20253412 AMAQI
3rd Aug 2025361 AMAQI
3rd Aug 2025372 AMAQI
3rd Aug 2025383 AMAQI
27°C25/31°C
3rd Aug 2025384 AMAQI
3rd Aug 2025385 AMAQI
3rd Aug 2025396 AMAQI
3rd Aug 2025397 AMAQI
3rd Aug 2025398 AMAQI
3rd Aug 2025419 AMAQI
3rd Aug 20255410 AMAQI
3rd Aug 20254511 AMAQI
3rd Aug 20255412 PMAQI
3rd Aug 2025521 PMAQI
3rd Aug 2025572 PMAQI
3rd Aug 2025483 PMAQI
3rd Aug 2025524 PMAQI
3rd Aug 2025475 PMAQI
3rd Aug 2025556 PMAQI
3rd Aug 2025537 PMAQI
3rd Aug 2025478 PMAQI
3rd Aug 2025429 PMAQI
3rd Aug 20254410 PMAQI
3rd Aug 20253811 PMAQI
4th Aug 20253212 AMAQI
4th Aug 2025361 AMAQI
4th Aug 2025382 AMAQI
4th Aug 2025403 AMAQI
28°C26/30°C
4th Aug 2025404 AMAQI
4th Aug 2025425 AMAQI
4th Aug 2025426 AMAQI
4th Aug 2025417 AMAQI
4th Aug 2025428 AMAQI
4th Aug 2025649 AMAQI
4th Aug 20257610 AMAQI
4th Aug 20258211 AMAQI
4th Aug 20258512 PMAQI
4th Aug 2025841 PMAQI
4th Aug 2025922 PMAQI
4th Aug 2025863 PMAQI
4th Aug 2025964 PMAQI
4th Aug 2025985 PMAQI
4th Aug 20251006 PMAQI
4th Aug 2025727 PMAQI
4th Aug 2025648 PMAQI
4th Aug 2025569 PMAQI
4th Aug 20255410 PMAQI
4th Aug 20254911 PMAQI
5th Aug 20255012 AMAQI
5th Aug 2025441 AMAQI
5th Aug 2025402 AMAQI
5th Aug 2025413 AMAQI
28°C27/30°C
5th Aug 2025494 AMAQI
5th Aug 2025525 AMAQI
5th Aug 2025476 AMAQI
5th Aug 2025487 AMAQI
5th Aug 2025538 AMAQI
5th Aug 2025539 AMAQI
5th Aug 20255810 AMAQI
5th Aug 20255511 AMAQI
5th Aug 20255712 PMAQI
5th Aug 2025521 PMAQI
5th Aug 2025462 PMAQI
5th Aug 2025523 PMAQI
5th Aug 2025564 PMAQI
5th Aug 2025515 PMAQI
5th Aug 2025486 PMAQI
5th Aug 2025487 PMAQI
5th Aug 2025488 PMAQI
5th Aug 2025489 PMAQI
5th Aug 20254210 PMAQI
5th Aug 20254011 PMAQI
6th Aug 20254112 AMAQI
6th Aug 2025471 AMAQI
6th Aug 2025472 AMAQI
6th Aug 2025493 AMAQI
28°C27/30°C
6th Aug 2025514 AMAQI
6th Aug 2025505 AMAQI
6th Aug 2025516 AMAQI
6th Aug 2025517 AMAQI
6th Aug 2025518 AMAQI
6th Aug 2025409 AMAQI
6th Aug 20254110 AMAQI
6th Aug 20253611 AMAQI
6th Aug 20255012 PMAQI
6th Aug 2025461 PMAQI
6th Aug 2025502 PMAQI
6th Aug 2025503 PMAQI
6th Aug 2025424 PMAQI
6th Aug 2025535 PMAQI
6th Aug 2025526 PMAQI
6th Aug 2025557 PMAQI
6th Aug 2025518 PMAQI
6th Aug 2025469 PMAQI
6th Aug 20254810 PMAQI
6th Aug 20254611 PMAQI
7th Aug 20254512 AMAQI
7th Aug 2025451 AMAQI
7th Aug 2025482 AMAQI
7th Aug 2025473 AMAQI
29°C27/32°C
7th Aug 2025464 AMAQI
7th Aug 2025445 AMAQI
7th Aug 2025456 AMAQI
7th Aug 2025427 AMAQI
7th Aug 2025448 AMAQI
7th Aug 2025399 AMAQI
7th Aug 20254210 AMAQI
7th Aug 20254811 AMAQI
7th Aug 20253612 PMAQI
7th Aug 2025291 PMAQI
7th Aug 2025402 PMAQI
7th Aug 2025563 PMAQI
7th Aug 2025514 PMAQI
7th Aug 2025515 PMAQI
7th Aug 2025536 PMAQI
7th Aug 2025477 PMAQI
7th Aug 2025518 PMAQI
7th Aug 2025479 PMAQI
7th Aug 20254610 PMAQI
7th Aug 20254611 PMAQI
8th Aug 20254512 AMAQI
8th Aug 2025471 AMAQI
8th Aug 2025482 AMAQI
8th Aug 2025473 AMAQI
29°C27/31°C
8th Aug 2025474 AMAQI
8th Aug 2025465 AMAQI
8th Aug 2025476 AMAQI
8th Aug 2025467 AMAQI
8th Aug 2025468 AMAQI
8th Aug 2025529 AMAQI
8th Aug 20255110 AMAQI
8th Aug 20253911 AMAQI
8th Aug 20254212 PMAQI
8th Aug 2025521 PMAQI
8th Aug 2025462 PMAQI
8th Aug 2025303 PMAQI
8th Aug 2025374 PMAQI
8th Aug 2025345 PMAQI
8th Aug 2025316 PMAQI
8th Aug 2025317 PMAQI
8th Aug 2025348 PMAQI
8th Aug 2025529 PMAQI
8th Aug 20254910 PMAQI
8th Aug 20254111 PMAQI
9th Aug 20254412 AMAQI
9th Aug 2025471 AMAQI
9th Aug 2025492 AMAQI
9th Aug 2025483 AMAQI
28°C25/30°C
9th Aug 2025484 AMAQI
9th Aug 2025475 AMAQI
9th Aug 2025486 AMAQI
9th Aug 2025477 AMAQI
9th Aug 2025488 AMAQI
9th Aug 2025449 AMAQI
9th Aug 20254610 AMAQI
9th Aug 20254211 AMAQI
9th Aug 20253812 PMAQI
9th Aug 2025401 PMAQI
9th Aug 2025462 PMAQI
9th Aug 2025483 PMAQI
9th Aug 2025484 PMAQI
9th Aug 2025445 PMAQI
9th Aug 2025506 PMAQI
9th Aug 2025487 PMAQI
9th Aug 2025518 PMAQI
9th Aug 2025529 PMAQI
9th Aug 20255210 PMAQI
9th Aug 20255211 PMAQI
10th Aug 20255112 AMAQI
10th Aug 2025481 AMAQI
10th Aug 2025462 AMAQI
10th Aug 2025483 AMAQI
26°C24/28°C
10th Aug 2025474 AMAQI
10th Aug 2025475 AMAQI
10th Aug 2025486 AMAQI
10th Aug 2025487 AMAQI
10th Aug 2025488 AMAQI
10th Aug 2025399 AMAQI
10th Aug 20252510 AMAQI
10th Aug 20252211 AMAQI
10th Aug 20252212 PMAQI
10th Aug 2025251 PMAQI
10th Aug 2025292 PMAQI
10th Aug 2025283 PMAQI
10th Aug 2025234 PMAQI
10th Aug 2025265 PMAQI
10th Aug 2025306 PMAQI
10th Aug 2025287 PMAQI
10th Aug 2025328 PMAQI
10th Aug 2025419 PMAQI
10th Aug 20253710 PMAQI
10th Aug 20253711 PMAQI
11th Aug 20254212 AMAQI
11th Aug 2025451 AMAQI
11th Aug 2025482 AMAQI
11th Aug 2025483 AMAQI
27°C25/28°C
11th Aug 2025464 AMAQI
4 AM11th Aug 2025445 AMAQI
11th Aug 2025446 AMAQI
11th Aug 2025447 AMAQI
11th Aug 2025448 AMAQI
11th Aug 2025289 AMAQI
11th Aug 20252010 AMAQI
11th Aug 20252011 AMAQI
11 AM11th Aug 20252212 PMAQI
11th Aug 2025221 PMAQI
11th Aug 2025222 PMAQI
11th Aug 2025283 PMAQI
11th Aug 2025304 PMAQI
11th Aug 2025325 PMAQI
11th Aug 2025366 PMAQI
6 PM11th Aug 2025367 PMAQI
11th Aug 2025358 PMAQI
11 PM
3 AM
--°C/°C
Day time
Avg. Highest Time
4 AM - 8 AM
41AQI
5 hours / Day
150 hours / Month
Avg. Lowest Time
10 AM
31AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 AM to 8 AM (Avg. 41), while the lowest AQI was between 10 AM to 10 AM (Avg. 31).
Night time
Avg. Highest Time
12 AM - 3 AM
40AQI
4 hours / Day
120 hours / Month
Avg. Lowest Time
7 PM - 8 PM
34AQI
2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 3 AM (Avg. 40), while the lowest AQI was between 7 PM to 8 PM (Avg. 34).
2025 Days Vs Air Quality
Katsuura, Chiba, Japan
2025
93%
205
7%
16
Total number of days with different AQI categories in last 223 days in 2025 (142 days remaining)
Good
205 DaysModerate
16 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 223 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
Katsuura, Chiba, 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
32AQI
32AQI
3rd January 2025
28AQI
28AQI
4th January 2025
26AQI
26AQI
5th January 2025
26AQI
26AQI
6th January 2025
43AQI
43AQI
7th January 2025
27AQI
27AQI
8th January 2025
35AQI
35AQI
9th January 2025
28AQI
28AQI
10th January 2025
30AQI
30AQI
11th January 2025
28AQI
28AQI
12th January 2025
37AQI
37AQI
13th January 2025
29AQI
29AQI
14th January 2025
35AQI
35AQI
15th January 2025
39AQI
39AQI
16th January 2025
31AQI
31AQI
17th January 2025
31AQI
31AQI
18th January 2025
30AQI
30AQI
19th January 2025
54AQI
54AQI
20th January 2025
35AQI
35AQI
21st January 2025
44AQI
44AQI
22nd January 2025
35AQI
35AQI
23rd January 2025
44AQI
44AQI
24th January 2025
45AQI
45AQI
25th January 2025
37AQI
37AQI
26th January 2025
38AQI
38AQI
27th January 2025
31AQI
31AQI
28th January 2025
37AQI
37AQI
29th January 2025
31AQI
31AQI
30th January 2025
34AQI
34AQI
31st January 2025
32AQI
32AQI
1st February 2025
38AQI
38AQI
2nd February 2025
32AQI
32AQI
3rd February 2025
36AQI
36AQI
4th February 2025
31AQI
31AQI
5th February 2025
35AQI
35AQI
6th February 2025
30AQI
30AQI
7th February 2025
32AQI
32AQI
8th February 2025
37AQI
37AQI
9th February 2025
31AQI
31AQI
10th February 2025
31AQI
31AQI
11th February 2025
32AQI
32AQI
12th February 2025
31AQI
31AQI
13th February 2025
38AQI
38AQI
14th February 2025
29AQI
29AQI
15th February 2025
31AQI
31AQI
16th February 2025
35AQI
35AQI
17th February 2025
41AQI
41AQI
18th February 2025
32AQI
32AQI
19th February 2025
32AQI
32AQI
20th February 2025
29AQI
29AQI
21st February 2025
30AQI
30AQI
22nd February 2025
30AQI
30AQI
23rd February 2025
32AQI
32AQI
24th February 2025
34AQI
34AQI
25th February 2025
36AQI
36AQI
26th February 2025
37AQI
37AQI
27th February 2025
38AQI
38AQI
28th February 2025
44AQI
44AQI
1st March 2025
45AQI
45AQI
2nd March 2025
58AQI
58AQI
3rd March 2025
40AQI
40AQI
4th March 2025
41AQI
41AQI
5th March 2025
27AQI
27AQI
6th March 2025
32AQI
32AQI
7th March 2025
31AQI
31AQI
8th March 2025
32AQI
32AQI
9th March 2025
33AQI
33AQI
10th March 2025
34AQI
34AQI
11th March 2025
33AQI
33AQI
12th March 2025
36AQI
36AQI
13th March 2025
40AQI
40AQI
14th March 2025
35AQI
35AQI
15th March 2025
35AQI
35AQI
16th March 2025
28AQI
28AQI
17th March 2025
23AQI
23AQI
18th March 2025
25AQI
25AQI
19th March 2025
20AQI
20AQI
20th March 2025
29AQI
29AQI
21st March 2025
37AQI
37AQI
22nd March 2025
41AQI
41AQI
23rd March 2025
49AQI
49AQI
24th March 2025
50AQI
50AQI
25th March 2025
64AQI
64AQI
26th March 2025
88AQI
88AQI
27th March 2025
70AQI
70AQI
28th March 2025
54AQI
54AQI
29th March 2025
40AQI
40AQI
30th March 2025
42AQI
42AQI
31st March 2025
34AQI
34AQI
1st April 2025
33AQI
33AQI
2nd April 2025
24AQI
24AQI
3rd April 2025
25AQI
25AQI
4th April 2025
24AQI
24AQI
5th April 2025
26AQI
26AQI
6th April 2025
21AQI
21AQI
7th April 2025
26AQI
26AQI
8th April 2025
29AQI
29AQI
9th April 2025
30AQI
30AQI
10th April 2025
42AQI
42AQI
11th April 2025
36AQI
36AQI
12th April 2025
34AQI
34AQI
13th April 2025
26AQI
26AQI
14th April 2025
41AQI
41AQI
15th April 2025
28AQI
28AQI
16th April 2025
32AQI
32AQI
17th April 2025
38AQI
38AQI
18th April 2025
45AQI
45AQI
19th April 2025
55AQI
55AQI
20th April 2025
35AQI
35AQI
21st April 2025
42AQI
42AQI
22nd April 2025
36AQI
36AQI
23rd April 2025
30AQI
30AQI
24th April 2025
32AQI
32AQI
25th April 2025
34AQI
34AQI
26th April 2025
39AQI
39AQI
27th April 2025
39AQI
39AQI
28th April 2025
34AQI
34AQI
29th April 2025
32AQI
32AQI
30th April 2025
36AQI
36AQI
1st May 2025
33AQI
33AQI
2nd May 2025
28AQI
28AQI
3rd May 2025
28AQI
28AQI
4th May 2025
35AQI
35AQI
5th May 2025
25AQI
25AQI
6th May 2025
27AQI
27AQI
7th May 2025
21AQI
21AQI
8th May 2025
24AQI
24AQI
9th May 2025
26AQI
26AQI
10th May 2025
24AQI
24AQI
11th May 2025
27AQI
27AQI
12th May 2025
28AQI
28AQI
13th May 2025
33AQI
33AQI
14th May 2025
26AQI
26AQI
15th May 2025
34AQI
34AQI
16th May 2025
31AQI
31AQI
17th May 2025
25AQI
25AQI
18th May 2025
36AQI
36AQI
19th May 2025
39AQI
39AQI
20th May 2025
55AQI
55AQI
21st May 2025
40AQI
40AQI
22nd May 2025
35AQI
35AQI
23rd May 2025
36AQI
36AQI
24th May 2025
35AQI
35AQI
25th May 2025
30AQI
30AQI
26th May 2025
27AQI
27AQI
27th May 2025
24AQI
24AQI
28th May 2025
25AQI
25AQI
29th May 2025
24AQI
24AQI
30th May 2025
21AQI
21AQI
31st May 2025
18AQI
18AQI
1st June 2025
20AQI
20AQI
2nd June 2025
23AQI
23AQI
3rd June 2025
25AQI
25AQI
4th June 2025
30AQI
30AQI
5th June 2025
34AQI
34AQI
6th June 2025
39AQI
39AQI
7th June 2025
44AQI
44AQI
8th June 2025
49AQI
49AQI
9th June 2025
38AQI
38AQI
10th June 2025
30AQI
30AQI
11th June 2025
27AQI
27AQI
12th June 2025
33AQI
33AQI
13th June 2025
30AQI
30AQI
14th June 2025
31AQI
31AQI
15th June 2025
33AQI
33AQI
16th June 2025
29AQI
29AQI
17th June 2025
40AQI
40AQI
18th June 2025
40AQI
40AQI
19th June 2025
37AQI
37AQI
20th June 2025
35AQI
35AQI
21st June 2025
28AQI
28AQI
22nd June 2025
23AQI
23AQI
23rd June 2025
23AQI
23AQI
24th June 2025
24AQI
24AQI
25th June 2025
23AQI
23AQI
26th June 2025
20AQI
20AQI
27th June 2025
32AQI
32AQI
28th June 2025
29AQI
29AQI
29th June 2025
28AQI
28AQI
30th June 2025
37AQI
37AQI
1st July 2025
36AQI
36AQI
2nd July 2025
42AQI
42AQI
3rd July 2025
41AQI
41AQI
4th July 2025
38AQI
38AQI
5th July 2025
53AQI
53AQI
6th July 2025
68AQI
68AQI
7th July 2025
77AQI
77AQI
8th July 2025
77AQI
77AQI
9th July 2025
72AQI
72AQI
10th July 2025
54AQI
54AQI
11th July 2025
50AQI
50AQI
12th July 2025
52AQI
52AQI
13th July 2025
48AQI
48AQI
14th July 2025
41AQI
41AQI
15th July 2025
42AQI
42AQI
16th July 2025
41AQI
41AQI
17th July 2025
39AQI
39AQI
18th July 2025
37AQI
37AQI
19th July 2025
33AQI
33AQI
20th July 2025
32AQI
32AQI
21st July 2025
33AQI
33AQI
22nd July 2025
30AQI
30AQI
23rd July 2025
31AQI
31AQI
24th July 2025
31AQI
31AQI
25th July 2025
25AQI
25AQI
26th July 2025
25AQI
25AQI
27th July 2025
23AQI
23AQI
28th July 2025
26AQI
26AQI
29th July 2025
27AQI
27AQI
30th July 2025
31AQI
31AQI
31st July 2025
31AQI
31AQI
1st August 2025
36AQI
36AQI
2nd August 2025
39AQI
39AQI
3rd August 2025
44AQI
44AQI
4th August 2025
62AQI
62AQI
5th August 2025
48AQI
48AQI
6th August 2025
48AQI
48AQI
7th August 2025
46AQI
46AQI
8th August 2025
43AQI
43AQI
9th August 2025
47AQI
47AQI
34AQI
34AQI
40AQI
33AQI
30AQI
31AQI
41AQI
46AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202535AQI
30
1
28
26
5
29
1
30
1
30
24
7
8
1
205
16
Highest AQI recorded in
August46AQI
Lowest AQI recorded in
May30AQI
202433AQI
16
1
4
2
12
30
22
9
31
28
1
31
27
3
31
235
13
Highest AQI recorded in
July43AQI
Lowest AQI recorded in
March18AQI
202338AQI
3
22
9
25
9
Highest AQI recorded in
December40AQI
Lowest AQI recorded in
November25AQI
202130AQI
28
2
26
2
27
4
28
2
28
3
28
2
29
2
27
4
30
31
25
1
307
22
Highest AQI recorded in
May38AQI
Lowest AQI recorded in
February26AQI
202026AQI
13
21
18
28
2
31
25
6
19
31
30
29
2
245
10
Highest AQI recorded in
August32AQI
Lowest AQI recorded in
September22AQI
Most & Least Polluted Years Over the Last 5 Years
Most Polluted Year Recorded
2023(Avg.)
38AQILeast Polluted Year Recorded
2020(Avg.)
26AQIKatsuura's annual 2025 AQI (35) shows an average percentage change of 12.9% (worsened AQI) compared to previous years: 2020 (26), 2021 (30), 2023 (38), 2024 (33).
