Country Background
HistoryAQIPM₂.₅PM₁₀COSO₂NO₂O₃

Ko, Chikusei, Ibaraki, Japan Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

July Air Quality Analysis

Ko, Chikusei, Ibaraki, Japan

2022
2024
2025
2026
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
20th Jul 2022
84AQI
Lowest AQI recorded on
3rd Jul 2026
19AQI

Same Day Analysis (31st July):
On this day, AQI across the 4 years varied significantly: 2026 ranks 1st highest AQI at 50 of Good air quality on the same day.

Day & Night AQI Trend: 30th Jul - 31st Jul 2026

Ko, Chikusei, Ibaraki, Japan

AQI
Day
Night
.

4 AM30th Jul 2026

6 PM

3 AM31st Jul 2026

Day time
Avg. Highest Time
4AM30th Jul

42AQI

Avg. Lowest Time
10AM30th Jul

21AQI

Night time
Avg. Highest Time
9PM30th Jul

69AQI

Avg. Lowest Time
2AM31st Jul

42AQI

In the last 24 hours,

Ko's AQI reached its highest point of 69 at 9 PM during the Night, while the lowest point, 21, was recorded at 10 AM during the Day between 30th Jul and 31st Jul 2026.

Day & Night AQI Trend : Jul 2026

Ko, Chikusei, Ibaraki, Japan

Jul
02nd - 03rd03rd - 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
Day
Night
2nd Jul 2026264 AMAQI
2nd Jul 2026225 AMAQI
2nd Jul 2026266 AMAQI
2nd Jul 2026267 AMAQI
2nd Jul 2026268 AMAQI
2nd Jul 2026319 AMAQI
2nd Jul 20262010 AMAQI
2nd Jul 20262011 AMAQI
2nd Jul 20261812 PMAQI
2nd Jul 2026201 PMAQI
2nd Jul 2026202 PMAQI
2nd Jul 2026123 PMAQI
2nd Jul 2026194 PMAQI
2nd Jul 2026215 PMAQI
2nd Jul 2026126 PMAQI
2nd Jul 2026107 PMAQI
2nd Jul 2026198 PMAQI
2nd Jul 2026199 PMAQI
2nd Jul 20262110 PMAQI
2nd Jul 20261411 PMAQI
3rd Jul 2026812 AMAQI
3rd Jul 2026211 AMAQI
3rd Jul 2026162 AMAQI
3rd Jul 2026103 AMAQI

21°C20/23°C

3rd Jul 2026144 AMAQI
3rd Jul 2026125 AMAQI
3rd Jul 2026146 AMAQI
3rd Jul 2026177 AMAQI
3rd Jul 2026148 AMAQI
3rd Jul 2026149 AMAQI
3rd Jul 20261710 AMAQI
3rd Jul 20261911 AMAQI
3rd Jul 20261712 PMAQI
3rd Jul 2026121 PMAQI
3rd Jul 2026232 PMAQI
3rd Jul 2026143 PMAQI
3rd Jul 2026334 PMAQI
3rd Jul 2026275 PMAQI
3rd Jul 2026296 PMAQI
3rd Jul 2026297 PMAQI
3rd Jul 2026218 PMAQI
3rd Jul 2026229 PMAQI
3rd Jul 20262410 PMAQI
3rd Jul 20262011 PMAQI
4th Jul 20261112 AMAQI
4th Jul 2026141 AMAQI
4th Jul 2026132 AMAQI
4th Jul 2026123 AMAQI

21°C20/24°C

4th Jul 2026174 AMAQI
4th Jul 2026325 AMAQI
4th Jul 2026326 AMAQI
4th Jul 2026247 AMAQI
4th Jul 2026288 AMAQI
4th Jul 2026249 AMAQI
4th Jul 20262010 AMAQI
4th Jul 20262211 AMAQI
4th Jul 20262312 PMAQI
4th Jul 2026241 PMAQI
4th Jul 2026242 PMAQI
4th Jul 2026263 PMAQI
4th Jul 2026264 PMAQI
4th Jul 2026585 PMAQI
4th Jul 2026596 PMAQI
4th Jul 2026587 PMAQI
4th Jul 2026528 PMAQI
4th Jul 2026629 PMAQI
4th Jul 20265510 PMAQI
4th Jul 20264811 PMAQI
5th Jul 20264212 AMAQI
5th Jul 2026381 AMAQI
5th Jul 2026312 AMAQI
5th Jul 2026333 AMAQI

22°C20/25°C

5th Jul 2026334 AMAQI
5th Jul 2026365 AMAQI
5th Jul 2026336 AMAQI
5th Jul 2026237 AMAQI
5th Jul 2026278 AMAQI
5th Jul 2026299 AMAQI
5th Jul 20262310 AMAQI
5th Jul 20261811 AMAQI
5th Jul 20261812 PMAQI
5th Jul 2026191 PMAQI
5th Jul 2026222 PMAQI
5th Jul 2026263 PMAQI
5th Jul 2026244 PMAQI
5th Jul 2026245 PMAQI
5th Jul 2026216 PMAQI
5th Jul 2026237 PMAQI
5th Jul 2026208 PMAQI
5th Jul 2026269 PMAQI
5th Jul 20262210 PMAQI
5th Jul 20262511 PMAQI
6th Jul 20262412 AMAQI
6th Jul 2026261 AMAQI
6th Jul 2026262 AMAQI
6th Jul 2026273 AMAQI

22°C21/25°C

6th Jul 2026224 AMAQI
6th Jul 2026245 AMAQI
6th Jul 2026266 AMAQI
6th Jul 2026257 AMAQI
6th Jul 2026248 AMAQI
6th Jul 2026229 AMAQI
6th Jul 20262610 AMAQI
6th Jul 20263611 AMAQI
6th Jul 20262612 PMAQI
6th Jul 2026121 PMAQI
6th Jul 2026142 PMAQI
6th Jul 2026173 PMAQI
6th Jul 2026304 PMAQI
6th Jul 2026215 PMAQI
6th Jul 2026286 PMAQI
6th Jul 2026227 PMAQI
6th Jul 2026198 PMAQI
6th Jul 2026249 PMAQI
6th Jul 20262510 PMAQI
6th Jul 20262411 PMAQI
7th Jul 20262812 AMAQI
7th Jul 2026301 AMAQI
7th Jul 2026282 AMAQI
7th Jul 2026303 AMAQI

21°C20/23°C

7th Jul 2026264 AMAQI
7th Jul 2026295 AMAQI
7th Jul 2026286 AMAQI
7th Jul 2026267 AMAQI
7th Jul 2026268 AMAQI
7th Jul 2026249 AMAQI
7th Jul 20262410 AMAQI
7th Jul 20262211 AMAQI
7th Jul 20262212 PMAQI
7th Jul 2026221 PMAQI
7th Jul 2026222 PMAQI
7th Jul 2026263 PMAQI
7th Jul 2026244 PMAQI
7th Jul 2026285 PMAQI
7th Jul 2026246 PMAQI
7th Jul 2026257 PMAQI
7th Jul 2026248 PMAQI
7th Jul 2026269 PMAQI
7th Jul 20262610 PMAQI
7th Jul 20262311 PMAQI
8th Jul 20262812 AMAQI
8th Jul 2026291 AMAQI
8th Jul 2026272 AMAQI
8th Jul 2026263 AMAQI

23°C19/28°C

8th Jul 2026244 AMAQI
8th Jul 2026285 AMAQI
8th Jul 2026246 AMAQI
8th Jul 2026227 AMAQI
8th Jul 2026218 AMAQI
8th Jul 2026249 AMAQI
8th Jul 20262010 AMAQI
8th Jul 20262111 AMAQI
8th Jul 20262212 PMAQI
8th Jul 2026221 PMAQI
8th Jul 2026202 PMAQI
8th Jul 2026253 PMAQI
8th Jul 2026264 PMAQI
8th Jul 2026225 PMAQI
8th Jul 2026216 PMAQI
8th Jul 2026207 PMAQI
8th Jul 2026198 PMAQI
8th Jul 2026209 PMAQI
8th Jul 20261610 PMAQI
8th Jul 20261711 PMAQI
9th Jul 20262612 AMAQI
9th Jul 2026221 AMAQI
9th Jul 2026262 AMAQI
9th Jul 2026283 AMAQI

24°C20/29°C

9th Jul 2026224 AMAQI
9th Jul 2026245 AMAQI
9th Jul 2026266 AMAQI
9th Jul 2026287 AMAQI
9th Jul 2026238 AMAQI
9th Jul 2026219 AMAQI
9th Jul 20262110 AMAQI
9th Jul 20262211 AMAQI
9th Jul 20262312 PMAQI
9th Jul 2026201 PMAQI
9th Jul 2026242 PMAQI
9th Jul 2026243 PMAQI
9th Jul 2026254 PMAQI
9th Jul 2026265 PMAQI
9th Jul 2026246 PMAQI
9th Jul 2026267 PMAQI
9th Jul 2026258 PMAQI
9th Jul 2026279 PMAQI
9th Jul 20262410 PMAQI
9th Jul 20262811 PMAQI
10th Jul 20262412 AMAQI
10th Jul 2026281 AMAQI
10th Jul 2026232 AMAQI
10th Jul 2026283 AMAQI

26°C21/32°C

10th Jul 2026244 AMAQI
10th Jul 2026275 AMAQI
10th Jul 2026276 AMAQI
10th Jul 2026277 AMAQI
10th Jul 2026278 AMAQI
10th Jul 2026269 AMAQI
10th Jul 20262610 AMAQI
10th Jul 20262411 AMAQI
10th Jul 20262512 PMAQI
10th Jul 2026221 PMAQI
10th Jul 2026222 PMAQI
10th Jul 2026223 PMAQI
10th Jul 2026194 PMAQI
10th Jul 2026295 PMAQI
10th Jul 2026296 PMAQI
10th Jul 2026287 PMAQI
10th Jul 2026228 PMAQI
10th Jul 2026299 PMAQI
10th Jul 20263210 PMAQI
10th Jul 20263011 PMAQI
11th Jul 20261812 AMAQI
11th Jul 202661 AMAQI
11th Jul 2026192 AMAQI
11th Jul 2026273 AMAQI

28°C23/33°C

11th Jul 2026264 AMAQI
11th Jul 2026295 AMAQI
11th Jul 2026306 AMAQI
11th Jul 2026317 AMAQI
11th Jul 2026308 AMAQI
11th Jul 2026329 AMAQI
11th Jul 20262110 AMAQI
11th Jul 20262011 AMAQI
11th Jul 20262412 PMAQI
11th Jul 2026231 PMAQI
11th Jul 2026242 PMAQI
11th Jul 2026243 PMAQI
11th Jul 2026264 PMAQI
11th Jul 2026315 PMAQI
11th Jul 2026286 PMAQI
11th Jul 2026287 PMAQI
11th Jul 2026268 PMAQI
11th Jul 2026289 PMAQI
11th Jul 20262810 PMAQI
11th Jul 20261611 PMAQI
12th Jul 20262812 AMAQI
12th Jul 2026221 AMAQI
12th Jul 2026282 AMAQI
12th Jul 2026283 AMAQI

27°C23/33°C

12th Jul 2026254 AMAQI
12th Jul 2026265 AMAQI
12th Jul 2026186 AMAQI
12th Jul 2026287 AMAQI
12th Jul 2026218 AMAQI
12th Jul 2026209 AMAQI
12th Jul 20262810 AMAQI
12th Jul 20262411 AMAQI
12th Jul 20262412 PMAQI
12th Jul 2026201 PMAQI
12th Jul 2026202 PMAQI
12th Jul 2026253 PMAQI
12th Jul 2026234 PMAQI
12th Jul 2026315 PMAQI
12th Jul 2026246 PMAQI
12th Jul 2026287 PMAQI
12th Jul 2026228 PMAQI
12th Jul 2026249 PMAQI
12th Jul 20263210 PMAQI
12th Jul 20262811 PMAQI
13th Jul 20263112 AMAQI
13th Jul 2026321 AMAQI
13th Jul 2026252 AMAQI
13th Jul 2026263 AMAQI

25°C24/29°C

13th Jul 2026244 AMAQI
13th Jul 2026255 AMAQI
13th Jul 2026306 AMAQI
13th Jul 2026277 AMAQI
13th Jul 2026298 AMAQI
13th Jul 2026249 AMAQI
13th Jul 20263210 AMAQI
13th Jul 20266711 AMAQI
13th Jul 20266212 PMAQI
13th Jul 2026711 PMAQI
13th Jul 2026782 PMAQI
13th Jul 2026653 PMAQI
13th Jul 2026764 PMAQI
13th Jul 2026605 PMAQI
13th Jul 2026626 PMAQI
13th Jul 2026657 PMAQI
13th Jul 2026578 PMAQI
13th Jul 2026679 PMAQI
13th Jul 20263410 PMAQI
13th Jul 20265211 PMAQI
14th Jul 20264012 AMAQI
14th Jul 2026291 AMAQI
14th Jul 2026312 AMAQI
14th Jul 2026573 AMAQI

26°C24/32°C

14th Jul 2026524 AMAQI
14th Jul 2026405 AMAQI
14th Jul 2026586 AMAQI
14th Jul 2026337 AMAQI
14th Jul 2026408 AMAQI
14th Jul 2026639 AMAQI
14th Jul 20265610 AMAQI
14th Jul 20263111 AMAQI
14th Jul 20264612 PMAQI
14th Jul 2026641 PMAQI
14th Jul 2026312 PMAQI
14th Jul 2026243 PMAQI
14th Jul 2026224 PMAQI
14th Jul 2026305 PMAQI
14th Jul 2026316 PMAQI
14th Jul 2026287 PMAQI
14th Jul 2026268 PMAQI
14th Jul 2026579 PMAQI
14th Jul 20266010 PMAQI
14th Jul 20264411 PMAQI
15th Jul 20263012 AMAQI
15th Jul 2026401 AMAQI
15th Jul 2026522 AMAQI
15th Jul 2026673 AMAQI

29°C23/35°C

15th Jul 2026554 AMAQI
15th Jul 2026335 AMAQI
15th Jul 2026546 AMAQI
15th Jul 2026527 AMAQI
15th Jul 2026368 AMAQI
15th Jul 2026489 AMAQI
15th Jul 20262510 AMAQI
15th Jul 20264411 AMAQI
15th Jul 20264412 PMAQI
15th Jul 2026531 PMAQI
15th Jul 2026682 PMAQI
15th Jul 2026643 PMAQI
15th Jul 2026694 PMAQI
15th Jul 2026655 PMAQI
15th Jul 2026636 PMAQI
15th Jul 2026687 PMAQI
15th Jul 2026658 PMAQI
15th Jul 2026609 PMAQI
15th Jul 20266410 PMAQI
15th Jul 20265211 PMAQI
16th Jul 20264812 AMAQI
16th Jul 2026591 AMAQI
16th Jul 2026672 AMAQI
16th Jul 2026673 AMAQI

30°C26/36°C

16th Jul 2026634 AMAQI
16th Jul 2026725 AMAQI
16th Jul 2026786 AMAQI
16th Jul 2026797 AMAQI
16th Jul 2026868 AMAQI
16th Jul 2026749 AMAQI
16th Jul 20266710 AMAQI
16th Jul 20265511 AMAQI
16th Jul 20267112 PMAQI
16th Jul 2026761 PMAQI
16th Jul 2026802 PMAQI
16th Jul 2026713 PMAQI
16th Jul 2026784 PMAQI
16th Jul 2026905 PMAQI
16th Jul 2026846 PMAQI
16th Jul 2026787 PMAQI
16th Jul 2026748 PMAQI
16th Jul 2026749 PMAQI
16th Jul 20266910 PMAQI
16th Jul 20266211 PMAQI
17th Jul 20266612 AMAQI
17th Jul 2026671 AMAQI
17th Jul 2026642 AMAQI
17th Jul 2026633 AMAQI

30°C26/35°C

17th Jul 2026634 AMAQI
17th Jul 2026625 AMAQI
17th Jul 2026666 AMAQI
17th Jul 2026677 AMAQI
17th Jul 2026628 AMAQI
17th Jul 2026609 AMAQI
17th Jul 20267610 AMAQI
17th Jul 20267911 AMAQI
17th Jul 20265712 PMAQI
17th Jul 2026681 PMAQI
17th Jul 2026402 PMAQI
17th Jul 2026553 PMAQI
17th Jul 2026444 PMAQI
17th Jul 2026425 PMAQI
17th Jul 2026386 PMAQI
17th Jul 2026297 PMAQI
17th Jul 2026388 PMAQI
17th Jul 2026429 PMAQI
17th Jul 20262910 PMAQI
17th Jul 20262911 PMAQI
18th Jul 20262512 AMAQI
18th Jul 2026271 AMAQI
18th Jul 2026252 AMAQI
18th Jul 2026253 AMAQI

27°C24/29°C

18th Jul 2026214 AMAQI
18th Jul 2026215 AMAQI
18th Jul 2026296 AMAQI
18th Jul 2026297 AMAQI
18th Jul 2026298 AMAQI
18th Jul 2026279 AMAQI
18th Jul 20262510 AMAQI
18th Jul 20262511 AMAQI
18th Jul 20262512 PMAQI
18th Jul 2026251 PMAQI
18th Jul 2026272 PMAQI
18th Jul 2026213 PMAQI
18th Jul 2026254 PMAQI
18th Jul 2026235 PMAQI
18th Jul 2026236 PMAQI
18th Jul 2026257 PMAQI
18th Jul 2026258 PMAQI
18th Jul 2026239 PMAQI
18th Jul 20262310 PMAQI
18th Jul 20262711 PMAQI
19th Jul 20262712 AMAQI
19th Jul 2026251 AMAQI
19th Jul 2026252 AMAQI
19th Jul 2026253 AMAQI

26°C24/29°C

19th Jul 2026234 AMAQI
19th Jul 2026215 AMAQI
19th Jul 2026216 AMAQI
19th Jul 2026237 AMAQI
19th Jul 2026298 AMAQI
19th Jul 2026259 AMAQI
19th Jul 20262710 AMAQI
19th Jul 20262111 AMAQI
19th Jul 20262512 PMAQI
19th Jul 2026211 PMAQI
19th Jul 2026252 PMAQI
19th Jul 2026403 PMAQI
19th Jul 2026424 PMAQI
19th Jul 2026335 PMAQI
19th Jul 2026506 PMAQI
19th Jul 2026467 PMAQI
19th Jul 2026488 PMAQI
19th Jul 2026529 PMAQI
19th Jul 20265110 PMAQI
19th Jul 20264011 PMAQI
20th Jul 20263612 AMAQI
20th Jul 2026401 AMAQI
20th Jul 2026482 AMAQI
20th Jul 2026443 AMAQI

27°C23/32°C

20th Jul 2026384 AMAQI
20th Jul 2026335 AMAQI
20th Jul 2026366 AMAQI
20th Jul 2026317 AMAQI
20th Jul 2026298 AMAQI
20th Jul 2026389 AMAQI
20th Jul 20265310 AMAQI
20th Jul 20264811 AMAQI
20th Jul 20264212 PMAQI
20th Jul 2026401 PMAQI
20th Jul 2026272 PMAQI
20th Jul 2026313 PMAQI
20th Jul 2026424 PMAQI
20th Jul 2026385 PMAQI
20th Jul 2026346 PMAQI
20th Jul 2026297 PMAQI
20th Jul 2026258 PMAQI
20th Jul 2026299 PMAQI
20th Jul 20264010 PMAQI
20th Jul 20264511 PMAQI
21st Jul 20264012 AMAQI
21st Jul 2026321 AMAQI
21st Jul 2026342 AMAQI
21st Jul 2026423 AMAQI

31°C26/37°C

21st Jul 2026464 AMAQI
21st Jul 2026445 AMAQI
21st Jul 2026466 AMAQI
21st Jul 2026477 AMAQI
21st Jul 2026538 AMAQI
21st Jul 2026549 AMAQI
21st Jul 20265310 AMAQI
21st Jul 20265511 AMAQI
21st Jul 2026601 PMAQI
21st Jul 2026572 PMAQI
21st Jul 2026563 PMAQI
21st Jul 2026564 PMAQI
21st Jul 2026565 PMAQI
21st Jul 2026556 PMAQI
21st Jul 2026977 PMAQI
21st Jul 2026558 PMAQI
21st Jul 2026579 PMAQI
21st Jul 20266410 PMAQI
21st Jul 20266511 PMAQI
22nd Jul 20266212 AMAQI
22nd Jul 2026581 AMAQI
22nd Jul 2026582 AMAQI
22nd Jul 2026573 AMAQI

31°C27/38°C

22nd Jul 2026624 AMAQI
22nd Jul 2026555 AMAQI
22nd Jul 2026696 AMAQI
22nd Jul 2026607 AMAQI
22nd Jul 2026738 AMAQI
22nd Jul 2026589 AMAQI
22nd Jul 20264910 AMAQI
22nd Jul 20265811 AMAQI
22nd Jul 20266412 PMAQI
22nd Jul 2026641 PMAQI
22nd Jul 2026642 PMAQI
22nd Jul 2026623 PMAQI
22nd Jul 2026654 PMAQI
22nd Jul 2026655 PMAQI
22nd Jul 2026646 PMAQI
22nd Jul 2026727 PMAQI
22nd Jul 2026768 PMAQI
22nd Jul 2026789 PMAQI
22nd Jul 20267010 PMAQI
22nd Jul 20264011 PMAQI
23rd Jul 20264012 AMAQI
23rd Jul 2026381 AMAQI
23rd Jul 2026442 AMAQI
23rd Jul 2026483 AMAQI

32°C27/38°C

23rd Jul 2026444 AMAQI
23rd Jul 2026445 AMAQI
23rd Jul 2026506 AMAQI
23rd Jul 2026527 AMAQI
23rd Jul 2026588 AMAQI
23rd Jul 2026649 AMAQI
23rd Jul 20266410 AMAQI
23rd Jul 20266411 AMAQI
23rd Jul 20266412 PMAQI
23rd Jul 2026681 PMAQI
23rd Jul 2026712 PMAQI
23rd Jul 2026653 PMAQI
23rd Jul 2026624 PMAQI
23rd Jul 2026535 PMAQI
23rd Jul 2026426 PMAQI
23rd Jul 2026407 PMAQI
23rd Jul 2026408 PMAQI
23rd Jul 2026389 PMAQI
23rd Jul 20263110 PMAQI
23rd Jul 20263111 PMAQI
24th Jul 20262712 AMAQI
24th Jul 2026231 AMAQI
24th Jul 2026212 AMAQI
24th Jul 2026253 AMAQI

30°C26/37°C

24th Jul 2026254 AMAQI
24th Jul 2026295 AMAQI
24th Jul 2026296 AMAQI
24th Jul 2026257 AMAQI
24th Jul 2026298 AMAQI
24th Jul 2026299 AMAQI
24th Jul 20263610 AMAQI
24th Jul 20262911 AMAQI
24th Jul 20263612 PMAQI
24th Jul 2026401 PMAQI
24th Jul 2026422 PMAQI
24th Jul 2026513 PMAQI
24th Jul 2026524 PMAQI
24th Jul 2026495 PMAQI
24th Jul 2026466 PMAQI
24th Jul 2026387 PMAQI
24th Jul 2026408 PMAQI
24th Jul 2026319 PMAQI
24th Jul 20263110 PMAQI
24th Jul 20262911 PMAQI
25th Jul 20262112 AMAQI
25th Jul 2026341 AMAQI
25th Jul 2026232 AMAQI
25th Jul 2026293 AMAQI

27°C25/32°C

25th Jul 2026254 AMAQI
25th Jul 2026235 AMAQI
25th Jul 2026236 AMAQI
25th Jul 2026217 AMAQI
25th Jul 2026338 AMAQI
25th Jul 2026219 AMAQI
25th Jul 20262510 AMAQI
25th Jul 20262711 AMAQI
25th Jul 20264012 PMAQI
25th Jul 2026421 PMAQI
25th Jul 2026382 PMAQI
25th Jul 2026293 PMAQI
25th Jul 2026234 PMAQI
25th Jul 2026215 PMAQI
25th Jul 2026316 PMAQI
25th Jul 2026277 PMAQI
25th Jul 2026388 PMAQI
25th Jul 2026299 PMAQI
25th Jul 20265410 PMAQI
25th Jul 20265311 PMAQI
26th Jul 20262612 AMAQI
26th Jul 2026291 AMAQI
26th Jul 2026252 AMAQI
26th Jul 2026293 AMAQI

27°C24/32°C

26th Jul 2026314 AMAQI
26th Jul 2026295 AMAQI
26th Jul 2026256 AMAQI
26th Jul 2026277 AMAQI
26th Jul 2026298 AMAQI
26th Jul 2026259 AMAQI
26th Jul 20262110 AMAQI
26th Jul 20262511 AMAQI
26th Jul 20262112 PMAQI
26th Jul 2026341 PMAQI
26th Jul 2026272 PMAQI
26th Jul 2026273 PMAQI
26th Jul 2026314 PMAQI
26th Jul 2026365 PMAQI
26th Jul 2026386 PMAQI
26th Jul 2026427 PMAQI
26th Jul 2026538 PMAQI
26th Jul 2026339 PMAQI
26th Jul 20263110 PMAQI
26th Jul 20263111 PMAQI
27th Jul 20263312 AMAQI
27th Jul 2026211 AMAQI
27th Jul 2026272 AMAQI
27th Jul 2026313 AMAQI

26°C24/31°C

27th Jul 2026274 AMAQI
27th Jul 2026255 AMAQI
27th Jul 2026126 AMAQI
27th Jul 2026177 AMAQI
27th Jul 2026128 AMAQI
27th Jul 2026129 AMAQI
27th Jul 20261910 AMAQI
27th Jul 20262511 AMAQI
27th Jul 20262512 PMAQI
27th Jul 2026251 PMAQI
27th Jul 2026252 PMAQI
27th Jul 2026253 PMAQI
27th Jul 2026294 PMAQI
27th Jul 2026255 PMAQI
27th Jul 2026256 PMAQI
27th Jul 2026367 PMAQI
27th Jul 2026258 PMAQI
27th Jul 2026239 PMAQI
27th Jul 20262710 PMAQI
27th Jul 20262911 PMAQI
28th Jul 20262712 AMAQI
28th Jul 2026341 AMAQI
28th Jul 2026232 AMAQI
28th Jul 2026323 AMAQI

25°C21/30°C

28th Jul 2026274 AMAQI
28th Jul 2026365 AMAQI
28th Jul 2026316 AMAQI
28th Jul 2026297 AMAQI
28th Jul 2026298 AMAQI
28th Jul 2026409 AMAQI
28th Jul 20265010 AMAQI
28th Jul 20265811 AMAQI
28th Jul 20263812 PMAQI
28th Jul 2026401 PMAQI
28th Jul 2026502 PMAQI
28th Jul 2026523 PMAQI
28th Jul 2026464 PMAQI
28th Jul 2026595 PMAQI
28th Jul 2026486 PMAQI
28th Jul 2026487 PMAQI
28th Jul 2026608 PMAQI
28th Jul 2026629 PMAQI
28th Jul 20264410 PMAQI
28th Jul 20264211 PMAQI
29th Jul 20264212 AMAQI
29th Jul 2026461 AMAQI
29th Jul 2026462 AMAQI
29th Jul 2026363 AMAQI

25°C22/29°C

29th Jul 2026384 AMAQI
29th Jul 2026515 AMAQI
29th Jul 2026586 AMAQI
29th Jul 2026507 AMAQI
29th Jul 2026388 AMAQI
29th Jul 2026389 AMAQI
29th Jul 20263810 AMAQI
29th Jul 20264011 AMAQI
29th Jul 20262312 PMAQI
29th Jul 2026331 PMAQI
29th Jul 2026272 PMAQI
29th Jul 2026333 PMAQI
29th Jul 2026214 PMAQI
29th Jul 2026255 PMAQI
29th Jul 2026256 PMAQI
29th Jul 2026277 PMAQI
29th Jul 2026338 PMAQI
29th Jul 2026259 PMAQI
29th Jul 20262710 PMAQI
29th Jul 20262711 PMAQI
30th Jul 20262712 AMAQI
30th Jul 2026231 AMAQI
30th Jul 2026422 AMAQI
30th Jul 2026383 AMAQI

28°C23/34°C

30th Jul 2026424 AMAQI
30th Jul 2026425 AMAQI
30th Jul 2026386 AMAQI
30th Jul 2026347 AMAQI
30th Jul 2026328 AMAQI
30th Jul 2026369 AMAQI
30th Jul 20262110 AMAQI
30th Jul 20262511 AMAQI
30th Jul 20263212 PMAQI
30th Jul 2026341 PMAQI
30th Jul 2026342 PMAQI
30th Jul 2026323 PMAQI
30th Jul 2026254 PMAQI
30th Jul 2026255 PMAQI
30th Jul 2026406 PMAQI
30th Jul 2026467 PMAQI
30th Jul 2026568 PMAQI
30th Jul 2026699 PMAQI
30th Jul 20264810 PMAQI
30th Jul 20266311 PMAQI
31st Jul 20265312 AMAQI
31st Jul 2026561 AMAQI
31st Jul 2026422 AMAQI
31st Jul 2026463 AMAQI

30°C25/35°C

31st Jul 2026534 AMAQI
4 AM
31st Jul 2026525 AMAQI
31st Jul 2026516 AMAQI
31st Jul 2026367 AMAQI
31st Jul 2026498 AMAQI
31st Jul 2026529 AMAQI
31st Jul 20265810 AMAQI
31st Jul 20267111 AMAQI
11 AM
31st Jul 20263612 PMAQI
31st Jul 2026481 PMAQI
31st Jul 2026532 PMAQI
31st Jul 2026423 PMAQI
31st Jul 2026514 PMAQI
31st Jul 2026655 PMAQI
31st Jul 2026536 PMAQI
6 PM
31st Jul 2026487 PMAQI
31st Jul 2026528 PMAQI
31st Jul 2026429 PMAQI
31st Jul 20264610 PMAQI
31st Jul 20265011 PMAQI
11 PM
3 AM

28°C25/32°C

Day time
Avg. Highest Time
4 PM - 6 PM

38AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
4 AM - 5 AM

34AQI

2 hours / Day
60 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 4 PM to 6 PM (Avg. 38), while the lowest AQI was between 4 AM to 5 AM (Avg. 34).
Night time
Avg. Highest Time
7 PM - 9 PM

40AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
12 AM

32AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 7 PM to 9 PM (Avg. 40), while the lowest AQI was between 12 AM to 12 AM (Avg. 32).

2026 Days Vs Air Quality

Ko, Chikusei, Ibaraki, Japan

2026

81%

171

19%

41

Total number of days with different AQI categories in last 212 days in 2026 (153 days remaining)

Good
171 Days
Moderate
41 Days
Poor
0 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 81%

Health Risk Level:

Low

In 2026, 81% of 212 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

Ko, Chikusei, 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
19AQI (US)
2nd January 2026
23AQI (US)
3rd January 2026
27AQI (US)
4th January 2026
29AQI (US)
5th January 2026
42AQI (US)
6th January 2026
26AQI (US)
7th January 2026
39AQI (US)
8th January 2026
45AQI (US)
9th January 2026
28AQI (US)
10th January 2026
47AQI (US)
11th January 2026
49AQI (US)
12th January 2026
20AQI (US)
13th January 2026
37AQI (US)
14th January 2026
15AQI (US)
15th January 2026
36AQI (US)
16th January 2026
55AQI (US)
17th January 2026
46AQI (US)
18th January 2026
31AQI (US)
19th January 2026
49AQI (US)
20th January 2026
43AQI (US)
21st January 2026
19AQI (US)
22nd January 2026
27AQI (US)
23rd January 2026
41AQI (US)
24th January 2026
43AQI (US)
25th January 2026
39AQI (US)
26th January 2026
18AQI (US)
27th January 2026
25AQI (US)
28th January 2026
24AQI (US)
29th January 2026
19AQI (US)
30th January 2026
35AQI (US)
31st January 2026
40AQI (US)
1st February 2026
39AQI (US)
2nd February 2026
21AQI (US)
3rd February 2026
23AQI (US)
4th February 2026
44AQI (US)
5th February 2026
54AQI (US)
6th February 2026
56AQI (US)
7th February 2026
17AQI (US)
8th February 2026
17AQI (US)
9th February 2026
36AQI (US)
10th February 2026
42AQI (US)
11th February 2026
59AQI (US)
12th February 2026
31AQI (US)
13th February 2026
38AQI (US)
14th February 2026
67AQI (US)
15th February 2026
73AQI (US)
16th February 2026
58AQI (US)
17th February 2026
19AQI (US)
18th February 2026
33AQI (US)
19th February 2026
31AQI (US)
20th February 2026
32AQI (US)
21st February 2026
44AQI (US)
22nd February 2026
40AQI (US)
23rd February 2026
45AQI (US)
24th February 2026
36AQI (US)
25th February 2026
32AQI (US)
26th February 2026
10AQI (US)
27th February 2026
40AQI (US)
28th February 2026
48AQI (US)
1st March 2026
39AQI (US)
2nd March 2026
89AQI (US)
3rd March 2026
47AQI (US)
4th March 2026
61AQI (US)
5th March 2026
62AQI (US)
6th March 2026
55AQI (US)
7th March 2026
40AQI (US)
8th March 2026
15AQI (US)
9th March 2026
38AQI (US)
10th March 2026
59AQI (US)
11th March 2026
62AQI (US)
12th March 2026
69AQI (US)
13th March 2026
43AQI (US)
14th March 2026
50AQI (US)
15th March 2026
61AQI (US)
16th March 2026
61AQI (US)
17th March 2026
58AQI (US)
18th March 2026
58AQI (US)
19th March 2026
39AQI (US)
20th March 2026
34AQI (US)
21st March 2026
46AQI (US)
22nd March 2026
51AQI (US)
23rd March 2026
55AQI (US)
24th March 2026
46AQI (US)
25th March 2026
55AQI (US)
26th March 2026
25AQI (US)
27th March 2026
19AQI (US)
28th March 2026
49AQI (US)
29th March 2026
57AQI (US)
30th March 2026
59AQI (US)
31st March 2026
34AQI (US)
1st April 2026
17AQI (US)
2nd April 2026
26AQI (US)
3rd April 2026
47AQI (US)
4th April 2026
46AQI (US)
5th April 2026
23AQI (US)
6th April 2026
24AQI (US)
7th April 2026
41AQI (US)
8th April 2026
19AQI (US)
9th April 2026
32AQI (US)
10th April 2026
49AQI (US)
11th April 2026
38AQI (US)
12th April 2026
32AQI (US)
13th April 2026
36AQI (US)
14th April 2026
40AQI (US)
15th April 2026
39AQI (US)
16th April 2026
31AQI (US)
17th April 2026
39AQI (US)
18th April 2026
34AQI (US)
19th April 2026
39AQI (US)
20th April 2026
38AQI (US)
21st April 2026
42AQI (US)
22nd April 2026
47AQI (US)
23rd April 2026
38AQI (US)
24th April 2026
34AQI (US)
25th April 2026
46AQI (US)
26th April 2026
51AQI (US)
27th April 2026
49AQI (US)
28th April 2026
43AQI (US)
29th April 2026
40AQI (US)
30th April 2026
41AQI (US)
1st May 2026
51AQI (US)
2nd May 2026
52AQI (US)
3rd May 2026
39AQI (US)
4th May 2026
30AQI (US)
5th May 2026
19AQI (US)
6th May 2026
32AQI (US)
7th May 2026
34AQI (US)
8th May 2026
27AQI (US)
9th May 2026
26AQI (US)
10th May 2026
34AQI (US)
11th May 2026
31AQI (US)
12th May 2026
37AQI (US)
13th May 2026
42AQI (US)
14th May 2026
35AQI (US)
15th May 2026
35AQI (US)
16th May 2026
85AQI (US)
17th May 2026
67AQI (US)
18th May 2026
53AQI (US)
19th May 2026
49AQI (US)
20th May 2026
61AQI (US)
21st May 2026
59AQI (US)
22nd May 2026
61AQI (US)
23rd May 2026
54AQI (US)
24th May 2026
58AQI (US)
25th May 2026
48AQI (US)
26th May 2026
40AQI (US)
27th May 2026
27AQI (US)
28th May 2026
25AQI (US)
29th May 2026
26AQI (US)
30th May 2026
26AQI (US)
31st May 2026
28AQI (US)
1st June 2026
31AQI (US)
2nd June 2026
32AQI (US)
3rd June 2026
27AQI (US)
4th June 2026
24AQI (US)
5th June 2026
23AQI (US)
6th June 2026
23AQI (US)
7th June 2026
22AQI (US)
8th June 2026
20AQI (US)
9th June 2026
23AQI (US)
10th June 2026
25AQI (US)
11th June 2026
25AQI (US)
12th June 2026
25AQI (US)
13th June 2026
31AQI (US)
14th June 2026
57AQI (US)
15th June 2026
22AQI (US)
16th June 2026
22AQI (US)
17th June 2026
25AQI (US)
18th June 2026
26AQI (US)
19th June 2026
30AQI (US)
20th June 2026
23AQI (US)
21st June 2026
20AQI (US)
22nd June 2026
19AQI (US)
23rd June 2026
22AQI (US)
24th June 2026
22AQI (US)
25th June 2026
27AQI (US)
26th June 2026
30AQI (US)
27th June 2026
29AQI (US)
28th June 2026
31AQI (US)
29th June 2026
31AQI (US)
30th June 2026
25AQI (US)
1st July 2026
25AQI (US)
2nd July 2026
21AQI (US)
3rd July 2026
19AQI (US)
4th July 2026
32AQI (US)
5th July 2026
26AQI (US)
6th July 2026
24AQI (US)
7th July 2026
26AQI (US)
8th July 2026
23AQI (US)
9th July 2026
24AQI (US)
10th July 2026
26AQI (US)
11th July 2026
25AQI (US)
12th July 2026
25AQI (US)
13th July 2026
47AQI (US)
14th July 2026
41AQI (US)
15th July 2026
53AQI (US)
16th July 2026
72AQI (US)
17th July 2026
54AQI (US)
18th July 2026
25AQI (US)
19th July 2026
32AQI (US)
20th July 2026
37AQI (US)
21st July 2026
53AQI (US)
22nd July 2026
63AQI (US)
23rd July 2026
51AQI (US)
24th July 2026
34AQI (US)
25th July 2026
30AQI (US)
26th July 2026
30AQI (US)
27th July 2026
24AQI (US)
28th July 2026
42AQI (US)
29th July 2026
35AQI (US)
30th July 2026
38AQI (US)
31st July 2026
50AQI (US)
1st August 2026
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

33AQI (US)

39AQI (US)

50AQI (US)

37AQI (US)

42AQI (US)

26AQI (US)

36AQI (US)

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202638AQI (US)

30
1
22
6
15
16
29
1
21
10
29
1
25
6
171
41

Highest AQI (US) recorded in

March

50AQI (US)

Lowest AQI (US) recorded in

June

26AQI (US)

202541AQI (US)

29
2
28
26
5
29
1
30
1
29
1
24
7
25
6
27
3
15
16
10
20
14
17
286
79

Highest AQI (US) recorded in

November

54AQI (US)

Lowest AQI (US) recorded in

May

29AQI (US)

202440AQI (US)

16
2
5
2
1
12
29
1
19
12
31
12
17
27
4
27
3
31
213
38

Highest AQI (US) recorded in

September

54AQI (US)

Lowest AQI (US) recorded in

August

33AQI (US)

202347AQI (US)

13
6
1
16
9
2
1
18
13
2
3
3
28
3
80
34
3
1

Highest AQI (US) recorded in

February

59AQI (US)

Lowest AQI (US) recorded in

November

21AQI (US)

202244AQI (US)

24
7
18
3
21
10
14
3
24
7
16
14
14
7
1
26
2
23
8
19
11
15
6
214
79

Highest AQI (US) recorded in

August

53AQI (US)

Lowest AQI (US) recorded in

September

40AQI (US)

202140AQI (US)

25
5
20
8
25
5
26
4
25
6
23
7
30
1
26
5
27
3
28
3
25
5
23
8
303
60

Highest AQI (US) recorded in

June

44AQI (US)

Lowest AQI (US) recorded in

April

37AQI (US)

202040AQI (US)

8
4
20
1
16
2
23
7
28
3
17
14
19
28
3
19
11
6
4
1
184
49
1

Highest AQI (US) recorded in

December

51AQI (US)

Lowest AQI (US) recorded in

September

32AQI (US)

Most & Least Polluted Years Over the Last 7 Years

Most Polluted Year Recorded
2023(Avg.)
47AQI (US)
Least Polluted Year Recorded
2026(Avg.)
38AQI (US)

Ko's annual 2026 AQI (US) (38) shows an average percentage change of -9.1% (improved AQI (US)) compared to previous years: 2020 (40), 2021 (40), 2022 (44), 2023 (47), 2024 (40), 2025 (41).