Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Chiayi, Chiayi, Taiwan 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

Chiayi, Chiayi, Taiwan

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
28th Aug 2021
62AQI
Lowest AQI recorded on
20th Aug 2024
19AQI

Same Day Analysis (20th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 39 of Good air quality on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 21st Aug - 22nd Aug 2025

Chiayi, Chiayi, Taiwan

AQI
Day
Night
.

5 AM21st Aug 2025

6 PM

4 AM22nd Aug 2025

Day time
Avg. Highest Time
7AM21st Aug

44AQI

Avg. Lowest Time
3PM21st Aug

31AQI

Night time
Avg. Highest Time
1AM22nd Aug

46AQI

Avg. Lowest Time
9PM21st Aug

36AQI

In the last 24 hours,

Chiayi's AQI reached its highest point of 46 at 1 AM during the Night, while the lowest point, 31, was recorded at 3 PM during the Day between 21st Aug and 22nd Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Chiayi, Chiayi, Taiwan

JulAug
23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 31st31st - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd
Day
Night
23rd Jul 2025375 AMAQI
23rd Jul 2025376 AMAQI
23rd Jul 2025377 AMAQI
23rd Jul 2025438 AMAQI
23rd Jul 2025419 AMAQI
23rd Jul 20254010 AMAQI
23rd Jul 20254611 AMAQI
23rd Jul 20254912 PMAQI
23rd Jul 2025521 PMAQI
23rd Jul 2025572 PMAQI
23rd Jul 2025663 PMAQI
23rd Jul 2025714 PMAQI
23rd Jul 2025695 PMAQI
23rd Jul 2025686 PMAQI
23rd Jul 2025617 PMAQI
23rd Jul 2025558 PMAQI
23rd Jul 2025549 PMAQI
23rd Jul 20255610 PMAQI
23rd Jul 20255511 PMAQI
24th Jul 20255112 AMAQI
24th Jul 2025391 AMAQI
24th Jul 2025402 AMAQI
24th Jul 2025413 AMAQI
24th Jul 2025434 AMAQI

30°C27/33°C

24th Jul 2025435 AMAQI
24th Jul 2025436 AMAQI
24th Jul 2025437 AMAQI
24th Jul 2025518 AMAQI
24th Jul 2025539 AMAQI
24th Jul 20254910 AMAQI
24th Jul 20255211 AMAQI
24th Jul 20255812 PMAQI
24th Jul 2025581 PMAQI
24th Jul 2025642 PMAQI
24th Jul 2025663 PMAQI
24th Jul 2025654 PMAQI
24th Jul 2025645 PMAQI
24th Jul 2025666 PMAQI
24th Jul 2025587 PMAQI
24th Jul 2025548 PMAQI
24th Jul 2025529 PMAQI
24th Jul 20255210 PMAQI
24th Jul 20255611 PMAQI
25th Jul 20255312 AMAQI
25th Jul 2025441 AMAQI
25th Jul 2025442 AMAQI
25th Jul 2025443 AMAQI
25th Jul 2025494 AMAQI

30°C27/34°C

25th Jul 2025485 AMAQI
25th Jul 2025486 AMAQI
25th Jul 2025487 AMAQI
25th Jul 2025568 AMAQI
25th Jul 2025609 AMAQI
25th Jul 20256110 AMAQI
25th Jul 20255411 AMAQI
25th Jul 20255012 PMAQI
25th Jul 2025461 PMAQI
25th Jul 2025452 PMAQI
25th Jul 2025483 PMAQI
25th Jul 2025534 PMAQI
25th Jul 2025535 PMAQI
25th Jul 2025496 PMAQI
25th Jul 2025437 PMAQI
25th Jul 2025448 PMAQI
25th Jul 2025469 PMAQI
25th Jul 20254510 PMAQI
25th Jul 20254411 PMAQI
26th Jul 20254412 AMAQI
26th Jul 2025481 AMAQI
26th Jul 2025482 AMAQI
26th Jul 2025493 AMAQI
26th Jul 2025504 AMAQI

30°C27/33°C

26th Jul 2025505 AMAQI
26th Jul 2025506 AMAQI
26th Jul 2025497 AMAQI
26th Jul 2025328 AMAQI
26th Jul 2025249 AMAQI
26th Jul 20252610 AMAQI
26th Jul 20252611 AMAQI
26th Jul 20253012 PMAQI
26th Jul 2025311 PMAQI
26th Jul 2025282 PMAQI
26th Jul 2025263 PMAQI
26th Jul 2025264 PMAQI
26th Jul 2025215 PMAQI
26th Jul 2025306 PMAQI
26th Jul 2025337 PMAQI
26th Jul 2025428 PMAQI
26th Jul 2025459 PMAQI
26th Jul 20255010 PMAQI
26th Jul 20255011 PMAQI
27th Jul 20255012 AMAQI
27th Jul 2025481 AMAQI
27th Jul 2025492 AMAQI
27th Jul 2025473 AMAQI
27th Jul 2025434 AMAQI

27°C26/28°C

27th Jul 2025435 AMAQI
27th Jul 2025446 AMAQI
27th Jul 2025447 AMAQI
27th Jul 2025428 AMAQI
27th Jul 2025459 AMAQI
27th Jul 20254010 AMAQI
27th Jul 20253911 AMAQI
27th Jul 20253812 PMAQI
27th Jul 2025381 PMAQI
27th Jul 2025452 PMAQI
27th Jul 2025403 PMAQI
27th Jul 2025454 PMAQI
27th Jul 2025455 PMAQI
27th Jul 2025506 PMAQI
27th Jul 2025487 PMAQI
27th Jul 2025468 PMAQI
27th Jul 2025479 PMAQI
27th Jul 20254510 PMAQI
27th Jul 20254311 PMAQI
28th Jul 20254712 AMAQI
28th Jul 2025461 AMAQI
28th Jul 2025462 AMAQI
28th Jul 2025463 AMAQI
28th Jul 2025444 AMAQI

29°C27/33°C

28th Jul 2025445 AMAQI
28th Jul 2025456 AMAQI
28th Jul 2025447 AMAQI
28th Jul 2025288 AMAQI
28th Jul 2025259 AMAQI
28th Jul 20252310 AMAQI
28th Jul 20252211 AMAQI
28th Jul 20252412 PMAQI
28th Jul 2025261 PMAQI
28th Jul 2025242 PMAQI
28th Jul 2025233 PMAQI
28th Jul 2025214 PMAQI
28th Jul 2025275 PMAQI
28th Jul 2025276 PMAQI
28th Jul 2025277 PMAQI
28th Jul 2025328 PMAQI
28th Jul 2025329 PMAQI
28th Jul 20253510 PMAQI
28th Jul 20253611 PMAQI
29th Jul 20254512 AMAQI
29th Jul 2025451 AMAQI
29th Jul 2025442 AMAQI
29th Jul 2025453 AMAQI
29th Jul 2025404 AMAQI

26°C25/27°C

29th Jul 2025405 AMAQI
29th Jul 2025406 AMAQI
29th Jul 2025407 AMAQI
29th Jul 2025298 AMAQI
29th Jul 2025259 AMAQI
29th Jul 20252010 AMAQI
29th Jul 20252611 AMAQI
29th Jul 20253212 PMAQI
29th Jul 2025251 PMAQI
29th Jul 2025262 PMAQI
29th Jul 2025203 PMAQI
29th Jul 2025204 PMAQI
29th Jul 2025195 PMAQI
29th Jul 2025186 PMAQI
29th Jul 2025287 PMAQI
29th Jul 2025368 PMAQI
29th Jul 2025389 PMAQI
29th Jul 20253910 PMAQI
29th Jul 20254411 PMAQI
30th Jul 20254012 AMAQI
30th Jul 2025421 AMAQI
30th Jul 2025432 AMAQI
30th Jul 2025413 AMAQI
30th Jul 2025384 AMAQI

26°C25/27°C

30th Jul 2025385 AMAQI
30th Jul 2025386 AMAQI
30th Jul 2025387 AMAQI
30th Jul 2025368 AMAQI
30th Jul 2025269 AMAQI
30th Jul 20253010 AMAQI
30th Jul 20253711 AMAQI
30th Jul 20254412 PMAQI
30th Jul 2025351 PMAQI
30th Jul 2025442 PMAQI
30th Jul 2025523 PMAQI
30th Jul 2025544 PMAQI
30th Jul 2025555 PMAQI
30th Jul 2025526 PMAQI
30th Jul 2025537 PMAQI
30th Jul 2025458 PMAQI
30th Jul 2025469 PMAQI
30th Jul 20254510 PMAQI
30th Jul 20254911 PMAQI
31st Jul 20254912 AMAQI
31st Jul 2025391 AMAQI
31st Jul 2025392 AMAQI
31st Jul 2025393 AMAQI
31st Jul 2025384 AMAQI

28°C25/31°C

31st Jul 2025385 AMAQI
31st Jul 2025386 AMAQI
31st Jul 2025387 AMAQI
31st Jul 2025388 AMAQI
31st Jul 2025389 AMAQI
31st Jul 20254310 AMAQI
31st Jul 20254211 AMAQI
31st Jul 20254212 PMAQI
31st Jul 2025421 PMAQI
31st Jul 2025372 PMAQI
31st Jul 2025293 PMAQI
31st Jul 2025454 PMAQI
31st Jul 2025375 PMAQI
31st Jul 2025466 PMAQI
31st Jul 2025437 PMAQI
31st Jul 2025498 PMAQI
31st Jul 2025469 PMAQI
31st Jul 20254810 PMAQI
31st Jul 20255111 PMAQI
1st Aug 20254712 AMAQI
1st Aug 2025461 AMAQI
1st Aug 2025472 AMAQI
1st Aug 2025393 AMAQI
1st Aug 2025404 AMAQI

29°C27/33°C

1st Aug 2025385 AMAQI
1st Aug 2025436 AMAQI
1st Aug 2025487 AMAQI
1st Aug 2025478 AMAQI
1st Aug 2025529 AMAQI
1st Aug 20255510 AMAQI
1st Aug 20255311 AMAQI
1st Aug 20255412 PMAQI
1st Aug 2025401 PMAQI
1st Aug 2025402 PMAQI
1st Aug 2025463 PMAQI
1st Aug 2025354 PMAQI
1st Aug 2025365 PMAQI
1st Aug 2025306 PMAQI
1st Aug 2025397 PMAQI
1st Aug 2025408 PMAQI
1st Aug 2025429 PMAQI
1st Aug 20254410 PMAQI
1st Aug 20254511 PMAQI
2nd Aug 20254412 AMAQI
2nd Aug 2025461 AMAQI
2nd Aug 2025442 AMAQI
2nd Aug 2025483 AMAQI
2nd Aug 2025494 AMAQI

29°C27/32°C

2nd Aug 2025485 AMAQI
2nd Aug 2025486 AMAQI
2nd Aug 2025477 AMAQI
2nd Aug 2025358 AMAQI
2nd Aug 2025369 AMAQI
2nd Aug 20253910 AMAQI
2nd Aug 20254111 AMAQI
2nd Aug 20254012 PMAQI
2nd Aug 2025451 PMAQI
2nd Aug 2025462 PMAQI
2nd Aug 2025443 PMAQI
2nd Aug 2025324 PMAQI
2nd Aug 2025245 PMAQI
2nd Aug 2025386 PMAQI
2nd Aug 2025377 PMAQI
2nd Aug 2025438 PMAQI
2nd Aug 2025419 PMAQI
2nd Aug 20254310 PMAQI
2nd Aug 20254411 PMAQI
3rd Aug 20254612 AMAQI
3rd Aug 2025481 AMAQI
3rd Aug 2025472 AMAQI
3rd Aug 2025483 AMAQI
3rd Aug 2025484 AMAQI

30°C27/33°C

3rd Aug 2025495 AMAQI
3rd Aug 2025486 AMAQI
3rd Aug 2025477 AMAQI
3rd Aug 2025438 AMAQI
3rd Aug 2025459 AMAQI
3rd Aug 20254510 AMAQI
3rd Aug 20253911 AMAQI
3rd Aug 20254012 PMAQI
3rd Aug 2025481 PMAQI
3rd Aug 2025402 PMAQI
3rd Aug 2025443 PMAQI
3rd Aug 2025384 PMAQI
3rd Aug 2025385 PMAQI
3rd Aug 2025396 PMAQI
3rd Aug 2025477 PMAQI
3rd Aug 2025408 PMAQI
3rd Aug 2025419 PMAQI
3rd Aug 20254110 PMAQI
3rd Aug 20254311 PMAQI
4th Aug 20254612 AMAQI
4th Aug 2025501 AMAQI
4th Aug 2025492 AMAQI
4th Aug 2025503 AMAQI
4th Aug 2025524 AMAQI

27°C25/30°C

4th Aug 2025515 AMAQI
4th Aug 2025496 AMAQI
4th Aug 2025497 AMAQI
4th Aug 2025248 AMAQI
4th Aug 2025329 AMAQI
4th Aug 20252510 AMAQI
4th Aug 20252711 AMAQI
4th Aug 20252812 PMAQI
4th Aug 2025391 PMAQI
4th Aug 2025342 PMAQI
4th Aug 2025293 PMAQI
4th Aug 2025334 PMAQI
4th Aug 2025335 PMAQI
4th Aug 2025286 PMAQI
4th Aug 2025347 PMAQI
4th Aug 2025398 PMAQI
4th Aug 2025409 PMAQI
4th Aug 20254010 PMAQI
4th Aug 20253711 PMAQI
5th Aug 20254412 AMAQI
5th Aug 2025481 AMAQI
5th Aug 2025522 AMAQI
5th Aug 2025493 AMAQI
5th Aug 2025474 AMAQI

25°C24/26°C

5th Aug 2025475 AMAQI
5th Aug 2025486 AMAQI
5th Aug 2025487 AMAQI
5th Aug 2025338 AMAQI
5th Aug 2025399 AMAQI
5th Aug 20253710 AMAQI
5th Aug 20254911 AMAQI
5th Aug 20254512 PMAQI
5th Aug 2025471 PMAQI
5th Aug 2025462 PMAQI
5th Aug 2025483 PMAQI
5th Aug 2025484 PMAQI
5th Aug 2025485 PMAQI
5th Aug 2025486 PMAQI
5th Aug 2025477 PMAQI
5th Aug 2025508 PMAQI
5th Aug 2025479 PMAQI
5th Aug 20254810 PMAQI
5th Aug 20254811 PMAQI
6th Aug 20255012 AMAQI
6th Aug 2025491 AMAQI
6th Aug 2025482 AMAQI
6th Aug 2025473 AMAQI
6th Aug 2025484 AMAQI

27°C24/30°C

6th Aug 2025485 AMAQI
6th Aug 2025506 AMAQI
6th Aug 2025477 AMAQI
6th Aug 2025418 AMAQI
6th Aug 2025449 AMAQI
6th Aug 20254110 AMAQI
6th Aug 20254611 AMAQI
6th Aug 20254512 PMAQI
6th Aug 2025491 PMAQI
6th Aug 2025452 PMAQI
6th Aug 2025493 PMAQI
6th Aug 2025464 PMAQI
6th Aug 2025465 PMAQI
6th Aug 2025426 PMAQI
6th Aug 2025467 PMAQI
6th Aug 2025488 PMAQI
6th Aug 2025489 PMAQI
6th Aug 20254710 PMAQI
6th Aug 20255011 PMAQI
7th Aug 20254812 AMAQI
7th Aug 2025501 AMAQI
7th Aug 2025472 AMAQI
7th Aug 2025483 AMAQI
7th Aug 2025504 AMAQI

30°C27/33°C

7th Aug 2025485 AMAQI
7th Aug 2025486 AMAQI
7th Aug 2025487 AMAQI
7th Aug 2025518 AMAQI
7th Aug 2025509 AMAQI
7th Aug 20254710 AMAQI
7th Aug 20255111 AMAQI
7th Aug 20254712 PMAQI
7th Aug 2025571 PMAQI
7th Aug 2025632 PMAQI
7th Aug 2025533 PMAQI
7th Aug 2025604 PMAQI
7th Aug 2025565 PMAQI
7th Aug 2025526 PMAQI
7th Aug 2025447 PMAQI
7th Aug 2025518 PMAQI
7th Aug 2025529 PMAQI
7th Aug 20255010 PMAQI
7th Aug 20254911 PMAQI
8th Aug 20255012 AMAQI
8th Aug 2025491 AMAQI
8th Aug 2025482 AMAQI
8th Aug 2025493 AMAQI
8th Aug 2025504 AMAQI

30°C27/33°C

8th Aug 2025515 AMAQI
8th Aug 2025506 AMAQI
8th Aug 2025507 AMAQI
8th Aug 2025568 AMAQI
8th Aug 2025609 AMAQI
8th Aug 20255810 AMAQI
8th Aug 20256611 AMAQI
8th Aug 20256612 PMAQI
8th Aug 2025671 PMAQI
8th Aug 2025662 PMAQI
8th Aug 2025683 PMAQI
8th Aug 2025544 PMAQI
8th Aug 2025435 PMAQI
8th Aug 2025376 PMAQI
8th Aug 2025487 PMAQI
8th Aug 2025508 PMAQI
8th Aug 2025519 PMAQI
8th Aug 20255010 PMAQI
8th Aug 20255211 PMAQI
9th Aug 20255512 AMAQI
9th Aug 2025501 AMAQI
9th Aug 2025512 AMAQI
9th Aug 2025523 AMAQI
9th Aug 2025534 AMAQI

30°C28/33°C

9th Aug 2025545 AMAQI
9th Aug 2025546 AMAQI
9th Aug 2025547 AMAQI
9th Aug 2025588 AMAQI
9th Aug 2025599 AMAQI
9th Aug 20255510 AMAQI
9th Aug 20255411 AMAQI
9th Aug 20255912 PMAQI
9th Aug 2025581 PMAQI
9th Aug 2025522 PMAQI
9th Aug 2025463 PMAQI
9th Aug 2025424 PMAQI
9th Aug 2025395 PMAQI
9th Aug 2025386 PMAQI
9th Aug 2025427 PMAQI
9th Aug 2025398 PMAQI
9th Aug 2025389 PMAQI
9th Aug 20253810 PMAQI
9th Aug 20253611 PMAQI
10th Aug 20254012 AMAQI
10th Aug 2025521 AMAQI
10th Aug 2025522 AMAQI
10th Aug 2025533 AMAQI
10th Aug 2025534 AMAQI

31°C29/34°C

10th Aug 2025535 AMAQI
10th Aug 2025536 AMAQI
10th Aug 2025537 AMAQI
10th Aug 2025458 AMAQI
10th Aug 2025369 AMAQI
10th Aug 20253610 AMAQI
10th Aug 20253811 AMAQI
10th Aug 20252812 PMAQI
10th Aug 2025381 PMAQI
10th Aug 2025372 PMAQI
10th Aug 2025393 PMAQI
10th Aug 2025254 PMAQI
10th Aug 2025275 PMAQI
10th Aug 2025316 PMAQI
10th Aug 2025377 PMAQI
10th Aug 2025438 PMAQI
10th Aug 2025449 PMAQI
10th Aug 20253810 PMAQI
10th Aug 20254111 PMAQI
11th Aug 20254612 AMAQI
11th Aug 2025521 AMAQI
11th Aug 2025522 AMAQI
11th Aug 2025513 AMAQI
11th Aug 2025484 AMAQI

31°C28/33°C

11th Aug 2025485 AMAQI
11th Aug 2025486 AMAQI
11th Aug 2025487 AMAQI
11th Aug 2025378 AMAQI
11th Aug 2025309 AMAQI
11th Aug 20252810 AMAQI
11th Aug 20252711 AMAQI
11th Aug 20252712 PMAQI
11th Aug 2025281 PMAQI
11th Aug 2025332 PMAQI
11th Aug 2025363 PMAQI
11th Aug 2025444 PMAQI
11th Aug 2025365 PMAQI
11th Aug 2025366 PMAQI
11th Aug 2025407 PMAQI
11th Aug 2025448 PMAQI
11th Aug 2025449 PMAQI
11th Aug 20254410 PMAQI
11th Aug 20253811 PMAQI
12th Aug 20255012 AMAQI
12th Aug 2025491 AMAQI
12th Aug 2025492 AMAQI
12th Aug 2025463 AMAQI
12th Aug 2025474 AMAQI

30°C28/32°C

12th Aug 2025495 AMAQI
12th Aug 2025466 AMAQI
12th Aug 2025457 AMAQI
12th Aug 2025498 AMAQI
12th Aug 2025579 AMAQI
12th Aug 20254810 AMAQI
12th Aug 20255811 AMAQI
12th Aug 20254412 PMAQI
12th Aug 2025431 PMAQI
12th Aug 2025472 PMAQI
12th Aug 2025503 PMAQI
12th Aug 2025414 PMAQI
12th Aug 2025485 PMAQI
12th Aug 2025446 PMAQI
12th Aug 2025487 PMAQI
12th Aug 2025468 PMAQI
12th Aug 2025509 PMAQI
12th Aug 20254810 PMAQI
12th Aug 20254411 PMAQI
13th Aug 20254412 AMAQI
13th Aug 2025511 AMAQI
13th Aug 2025492 AMAQI
13th Aug 2025493 AMAQI
13th Aug 2025494 AMAQI

30°C28/32°C

13th Aug 2025485 AMAQI
13th Aug 2025516 AMAQI
13th Aug 2025497 AMAQI
13th Aug 2025308 AMAQI
13th Aug 2025419 AMAQI
13th Aug 20252810 AMAQI
13th Aug 20254611 AMAQI
13th Aug 20254312 PMAQI
13th Aug 2025491 PMAQI
13th Aug 2025402 PMAQI
13th Aug 2025503 PMAQI
13th Aug 2025454 PMAQI
13th Aug 2025415 PMAQI
13th Aug 2025396 PMAQI
13th Aug 2025357 PMAQI
13th Aug 2025438 PMAQI
13th Aug 2025439 PMAQI
13th Aug 20254210 PMAQI
13th Aug 20253911 PMAQI
14th Aug 20254712 AMAQI
14th Aug 2025511 AMAQI
14th Aug 2025502 AMAQI
14th Aug 2025463 AMAQI
14th Aug 2025464 AMAQI

29°C25/34°C

14th Aug 2025485 AMAQI
14th Aug 2025466 AMAQI
14th Aug 2025467 AMAQI
14th Aug 2025208 AMAQI
14th Aug 2025229 AMAQI
14th Aug 20252810 AMAQI
14th Aug 20253011 AMAQI
14th Aug 20252612 PMAQI
14th Aug 2025261 PMAQI
14th Aug 2025262 PMAQI
14th Aug 2025273 PMAQI
14th Aug 2025284 PMAQI
14th Aug 2025295 PMAQI
14th Aug 2025366 PMAQI
14th Aug 2025417 PMAQI
14th Aug 2025408 PMAQI
14th Aug 2025379 PMAQI
14th Aug 20253910 PMAQI
14th Aug 20253811 PMAQI
15th Aug 20254412 AMAQI
15th Aug 2025461 AMAQI
15th Aug 2025452 AMAQI
15th Aug 2025433 AMAQI
15th Aug 2025424 AMAQI

30°C26/35°C

15th Aug 2025405 AMAQI
15th Aug 2025416 AMAQI
15th Aug 2025427 AMAQI
15th Aug 2025268 AMAQI
15th Aug 2025369 AMAQI
15th Aug 20254010 AMAQI
15th Aug 20253811 AMAQI
15th Aug 20253612 PMAQI
15th Aug 2025431 PMAQI
15th Aug 2025362 PMAQI
15th Aug 2025293 PMAQI
15th Aug 2025424 PMAQI
15th Aug 2025325 PMAQI
15th Aug 2025336 PMAQI
15th Aug 2025417 PMAQI
15th Aug 2025448 PMAQI
15th Aug 2025459 PMAQI
15th Aug 20254110 PMAQI
15th Aug 20254211 PMAQI
16th Aug 20254312 AMAQI
16th Aug 2025471 AMAQI
16th Aug 2025472 AMAQI
16th Aug 2025463 AMAQI
16th Aug 2025444 AMAQI

30°C28/33°C

16th Aug 2025415 AMAQI
16th Aug 2025436 AMAQI
16th Aug 2025427 AMAQI
16th Aug 2025448 AMAQI
16th Aug 2025399 AMAQI
16th Aug 20254310 AMAQI
16th Aug 20253611 AMAQI
16th Aug 20253812 PMAQI
16th Aug 2025431 PMAQI
16th Aug 2025362 PMAQI
16th Aug 2025343 PMAQI
16th Aug 2025364 PMAQI
16th Aug 2025535 PMAQI
16th Aug 2025516 PMAQI
16th Aug 2025507 PMAQI
16th Aug 2025428 PMAQI
16th Aug 2025439 PMAQI
16th Aug 20254510 PMAQI
16th Aug 20254411 PMAQI
17th Aug 20254312 AMAQI
17th Aug 2025431 AMAQI
17th Aug 2025422 AMAQI
17th Aug 2025403 AMAQI
17th Aug 2025424 AMAQI

31°C28/34°C

17th Aug 2025425 AMAQI
17th Aug 2025406 AMAQI
17th Aug 2025407 AMAQI
17th Aug 2025338 AMAQI
17th Aug 2025359 AMAQI
17th Aug 20253210 AMAQI
17th Aug 20253411 AMAQI
17th Aug 20253112 PMAQI
17th Aug 2025371 PMAQI
17th Aug 2025342 PMAQI
17th Aug 2025383 PMAQI
17th Aug 2025304 PMAQI
17th Aug 2025325 PMAQI
17th Aug 2025296 PMAQI
17th Aug 2025407 PMAQI
17th Aug 2025418 PMAQI
17th Aug 2025419 PMAQI
17th Aug 20253910 PMAQI
17th Aug 20253911 PMAQI
18th Aug 20254012 AMAQI
18th Aug 2025411 AMAQI
18th Aug 2025402 AMAQI
18th Aug 2025403 AMAQI
18th Aug 2025404 AMAQI

30°C28/33°C

18th Aug 2025435 AMAQI
18th Aug 2025406 AMAQI
18th Aug 2025397 AMAQI
18th Aug 2025378 AMAQI
18th Aug 2025339 AMAQI
18th Aug 20254010 AMAQI
18th Aug 20253411 AMAQI
18th Aug 20253512 PMAQI
18th Aug 2025351 PMAQI
18th Aug 2025382 PMAQI
18th Aug 2025383 PMAQI
18th Aug 2025304 PMAQI
18th Aug 2025315 PMAQI
18th Aug 2025286 PMAQI
18th Aug 2025407 PMAQI
18th Aug 2025378 PMAQI
18th Aug 2025359 PMAQI
18th Aug 20253510 PMAQI
18th Aug 20253811 PMAQI
19th Aug 20254112 AMAQI
19th Aug 2025421 AMAQI
19th Aug 2025422 AMAQI
19th Aug 2025423 AMAQI
19th Aug 2025414 AMAQI

29°C28/32°C

19th Aug 2025415 AMAQI
19th Aug 2025426 AMAQI
19th Aug 2025417 AMAQI
19th Aug 2025308 AMAQI
19th Aug 2025289 AMAQI
19th Aug 20254110 AMAQI
19th Aug 20254511 AMAQI
19th Aug 20254112 PMAQI
19th Aug 2025401 PMAQI
19th Aug 2025362 PMAQI
19th Aug 2025363 PMAQI
19th Aug 2025364 PMAQI
19th Aug 2025355 PMAQI
19th Aug 2025366 PMAQI
19th Aug 2025387 PMAQI
19th Aug 2025438 PMAQI
19th Aug 2025379 PMAQI
19th Aug 20254310 PMAQI
19th Aug 20254211 PMAQI
20th Aug 20254112 AMAQI
20th Aug 2025421 AMAQI
20th Aug 2025432 AMAQI
20th Aug 2025443 AMAQI
20th Aug 2025434 AMAQI

30°C28/33°C

20th Aug 2025435 AMAQI
20th Aug 2025426 AMAQI
20th Aug 2025427 AMAQI
20th Aug 2025398 AMAQI
20th Aug 2025389 AMAQI
20th Aug 20254710 AMAQI
20th Aug 20254411 AMAQI
20th Aug 20253812 PMAQI
20th Aug 2025401 PMAQI
20th Aug 2025322 PMAQI
20th Aug 2025373 PMAQI
20th Aug 2025324 PMAQI
20th Aug 2025265 PMAQI
20th Aug 2025246 PMAQI
20th Aug 2025377 PMAQI
20th Aug 2025388 PMAQI
20th Aug 2025419 PMAQI
20th Aug 20253510 PMAQI
20th Aug 20253911 PMAQI
21st Aug 20254012 AMAQI
21st Aug 2025431 AMAQI
21st Aug 2025432 AMAQI
21st Aug 2025433 AMAQI
21st Aug 2025434 AMAQI

29°C28/33°C

21st Aug 2025435 AMAQI
21st Aug 2025436 AMAQI
21st Aug 2025447 AMAQI
21st Aug 2025338 AMAQI
21st Aug 2025339 AMAQI
21st Aug 20253110 AMAQI
21st Aug 20253611 AMAQI
21st Aug 20253712 PMAQI
21st Aug 2025311 PMAQI
21st Aug 2025332 PMAQI
21st Aug 2025313 PMAQI
21st Aug 2025344 PMAQI
21st Aug 2025375 PMAQI
21st Aug 2025386 PMAQI
21st Aug 2025367 PMAQI
21st Aug 2025408 PMAQI
21st Aug 2025369 PMAQI
21st Aug 20253710 PMAQI
21st Aug 20253811 PMAQI
22nd Aug 20254412 AMAQI
22nd Aug 2025461 AMAQI
22nd Aug 2025442 AMAQI
22nd Aug 2025433 AMAQI
22nd Aug 2025444 AMAQI

30°C27/34°C

22nd Aug 2025425 AMAQI
5 AM
22nd Aug 2025426 AMAQI
22nd Aug 2025427 AMAQI
22nd Aug 2025378 AMAQI
22nd Aug 2025329 AMAQI
22nd Aug 20255410 AMAQI
22nd Aug 20255811 AMAQI
11 AM
22nd Aug 20254712 PMAQI
22nd Aug 2025491 PMAQI
22nd Aug 2025472 PMAQI
22nd Aug 2025503 PMAQI
22nd Aug 2025544 PMAQI
22nd Aug 2025465 PMAQI
6 PM
11 PM
4 AM

--°C/°C

Day time
Avg. Highest Time
5 AM - 7 AM

45AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
8 AM - 10 AM

39AQI

3 hours / Day
90 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 AM (Avg. 45), while the lowest AQI was between 8 AM to 10 AM (Avg. 39).
Night time
Avg. Highest Time
12 AM - 4 AM

46AQI

5 hours / Day
150 hours / Month
Avg. Lowest Time
7 PM - 11 PM

43AQI

5 hours / Day
150 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 4 AM (Avg. 46), while the lowest AQI was between 7 PM to 11 PM (Avg. 43).

2025 Days Vs Air Quality

Chiayi, Chiayi, Taiwan

2025

40%

93

59%

137

0.8%

2

Total number of days with different AQI categories in last 234 days in 2025 (131 days remaining)

Good
93 Days
Moderate
137 Days
Poor
2 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 40%

Health Risk Level:

Significant

In 2025, 40% of 234 days were within WHO’s safe air quality limits, and 60% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.

Annual Air Quality Insights

Chiayi, Chiayi, Taiwan

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
112AQI
2nd January 2025
69AQI
3rd January 2025
70AQI
4th January 2025
65AQI
5th January 2025
73AQI
6th January 2025
83AQI
7th January 2025
90AQI
8th January 2025
80AQI
9th January 2025
79AQI
10th January 2025
67AQI
11th January 2025
63AQI
12th January 2025
63AQI
13th January 2025
65AQI
14th January 2025
82AQI
15th January 2025
78AQI
16th January 2025
73AQI
17th January 2025
73AQI
18th January 2025
78AQI
19th January 2025
73AQI
20th January 2025
79AQI
21st January 2025
91AQI
22nd January 2025
100AQI
23rd January 2025
95AQI
24th January 2025
89AQI
25th January 2025
96AQI
26th January 2025
82AQI
27th January 2025
60AQI
28th January 2025
69AQI
29th January 2025
69AQI
30th January 2025
76AQI
31st January 2025
86AQI
1st February 2025
64AQI
2nd February 2025
70AQI
3rd February 2025
61AQI
4th February 2025
72AQI
5th February 2025
83AQI
6th February 2025
95AQI
7th February 2025
69AQI
8th February 2025
70AQI
9th February 2025
59AQI
10th February 2025
63AQI
11th February 2025
74AQI
12th February 2025
69AQI
13th February 2025
55AQI
14th February 2025
71AQI
15th February 2025
59AQI
16th February 2025
80AQI
17th February 2025
94AQI
18th February 2025
95AQI
19th February 2025
85AQI
20th February 2025
99AQI
21st February 2025
64AQI
22nd February 2025
76AQI
23rd February 2025
55AQI
24th February 2025
68AQI
25th February 2025
81AQI
26th February 2025
99AQI
27th February 2025
106AQI
28th February 2025
74AQI
1st March 2025
74AQI
2nd March 2025
64AQI
3rd March 2025
60AQI
4th March 2025
59AQI
5th March 2025
54AQI
6th March 2025
52AQI
7th March 2025
64AQI
8th March 2025
68AQI
9th March 2025
70AQI
10th March 2025
91AQI
11th March 2025
93AQI
12th March 2025
78AQI
13th March 2025
72AQI
14th March 2025
81AQI
15th March 2025
72AQI
16th March 2025
58AQI
17th March 2025
82AQI
18th March 2025
66AQI
19th March 2025
72AQI
20th March 2025
70AQI
21st March 2025
76AQI
22nd March 2025
76AQI
23rd March 2025
74AQI
24th March 2025
69AQI
25th March 2025
68AQI
26th March 2025
66AQI
27th March 2025
61AQI
28th March 2025
71AQI
29th March 2025
64AQI
30th March 2025
56AQI
31st March 2025
60AQI
1st April 2025
49AQI
2nd April 2025
68AQI
3rd April 2025
71AQI
4th April 2025
73AQI
5th April 2025
80AQI
6th April 2025
70AQI
7th April 2025
72AQI
8th April 2025
74AQI
9th April 2025
68AQI
10th April 2025
68AQI
11th April 2025
66AQI
12th April 2025
58AQI
13th April 2025
79AQI
14th April 2025
70AQI
15th April 2025
83AQI
16th April 2025
80AQI
17th April 2025
67AQI
18th April 2025
62AQI
19th April 2025
61AQI
20th April 2025
60AQI
21st April 2025
61AQI
22nd April 2025
55AQI
23rd April 2025
57AQI
24th April 2025
55AQI
25th April 2025
55AQI
26th April 2025
68AQI
27th April 2025
66AQI
28th April 2025
59AQI
29th April 2025
72AQI
30th April 2025
63AQI
1st May 2025
64AQI
2nd May 2025
69AQI
3rd May 2025
67AQI
4th May 2025
70AQI
5th May 2025
60AQI
6th May 2025
62AQI
7th May 2025
58AQI
8th May 2025
60AQI
9th May 2025
45AQI
10th May 2025
38AQI
11th May 2025
39AQI
12th May 2025
52AQI
13th May 2025
53AQI
14th May 2025
56AQI
15th May 2025
48AQI
16th May 2025
50AQI
17th May 2025
40AQI
18th May 2025
35AQI
19th May 2025
35AQI
20th May 2025
37AQI
21st May 2025
32AQI
22nd May 2025
40AQI
23rd May 2025
41AQI
24th May 2025
43AQI
25th May 2025
52AQI
26th May 2025
55AQI
27th May 2025
53AQI
28th May 2025
58AQI
29th May 2025
40AQI
30th May 2025
51AQI
31st May 2025
53AQI
1st June 2025
49AQI
2nd June 2025
37AQI
3rd June 2025
33AQI
4th June 2025
37AQI
5th June 2025
35AQI
6th June 2025
38AQI
7th June 2025
36AQI
8th June 2025
35AQI
9th June 2025
33AQI
10th June 2025
39AQI
11th June 2025
44AQI
12th June 2025
44AQI
13th June 2025
31AQI
14th June 2025
37AQI
15th June 2025
40AQI
16th June 2025
34AQI
17th June 2025
31AQI
18th June 2025
31AQI
19th June 2025
31AQI
20th June 2025
32AQI
21st June 2025
28AQI
22nd June 2025
23AQI
23rd June 2025
25AQI
24th June 2025
27AQI
25th June 2025
29AQI
26th June 2025
29AQI
27th June 2025
29AQI
28th June 2025
30AQI
29th June 2025
32AQI
30th June 2025
35AQI
1st July 2025
37AQI
2nd July 2025
41AQI
3rd July 2025
44AQI
4th July 2025
42AQI
5th July 2025
36AQI
6th July 2025
32AQI
7th July 2025
31AQI
8th July 2025
39AQI
9th July 2025
39AQI
10th July 2025
31AQI
11th July 2025
35AQI
12th July 2025
41AQI
13th July 2025
46AQI
14th July 2025
48AQI
15th July 2025
43AQI
16th July 2025
42AQI
17th July 2025
43AQI
18th July 2025
44AQI
19th July 2025
40AQI
20th July 2025
34AQI
21st July 2025
35AQI
22nd July 2025
37AQI
23rd July 2025
50AQI
24th July 2025
52AQI
25th July 2025
48AQI
26th July 2025
39AQI
27th July 2025
45AQI
28th July 2025
34AQI
29th July 2025
33AQI
30th July 2025
43AQI
31st July 2025
42AQI
1st August 2025
43AQI
2nd August 2025
42AQI
3rd August 2025
44AQI
4th August 2025
39AQI
5th August 2025
47AQI
6th August 2025
47AQI
7th August 2025
51AQI
8th August 2025
53AQI
9th August 2025
48AQI
10th August 2025
42AQI
11th August 2025
41AQI
12th August 2025
48AQI
13th August 2025
44AQI
14th August 2025
38AQI
15th August 2025
40AQI
16th August 2025
44AQI
17th August 2025
38AQI
18th August 2025
37AQI
19th August 2025
39AQI
20th August 2025
39AQI
21st August 2025
22nd August 2025
23rd August 2025
24th August 2025
25th August 2025
26th August 2025
27th August 2025
28th August 2025
29th August 2025
30th August 2025
31st August 2025
1st September 2025
2nd September 2025
3rd September 2025
4th September 2025
5th September 2025
6th September 2025
7th September 2025
8th September 2025
9th September 2025
10th September 2025
11th September 2025
12th September 2025
13th September 2025
14th September 2025
15th September 2025
16th September 2025
17th September 2025
18th September 2025
19th September 2025
20th September 2025
21st September 2025
22nd September 2025
23rd September 2025
24th September 2025
25th September 2025
26th September 2025
27th September 2025
28th September 2025
29th September 2025
30th September 2025
1st October 2025
2nd October 2025
3rd October 2025
4th October 2025
5th October 2025
6th October 2025
7th October 2025
8th October 2025
9th October 2025
10th October 2025
11th October 2025
12th October 2025
13th October 2025
14th October 2025
15th October 2025
16th October 2025
17th October 2025
18th October 2025
19th October 2025
20th October 2025
21st October 2025
22nd October 2025
23rd October 2025
24th October 2025
25th October 2025
26th October 2025
27th October 2025
28th October 2025
29th October 2025
30th October 2025
31st October 2025
1st November 2025
2nd November 2025
3rd November 2025
4th November 2025
5th November 2025
6th November 2025
7th November 2025
8th November 2025
9th November 2025
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

78AQI

75AQI

69AQI

66AQI

50AQI

34AQI

40AQI

43AQI

No. of days

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

202558AQI

30
1
27
1
31
1
29
14
17
30
30
1
18
2
93
137
2

Highest AQI recorded in

January

78AQI

Lowest AQI recorded in

June

34AQI

202459AQI

1
24
6
3
24
2
1
23
7
9
21
12
19
28
1
31
30
1
17
13
12
19
2
27
1
31
146
203
16

Highest AQI recorded in

January

89AQI

Lowest AQI recorded in

July

31AQI

202363AQI

1
25
5
1
18
9
2
29
28
2
7
24
27
3
29
2
29
2
20
10
6
24
1
29
1
30
123
224
17

Highest AQI recorded in

February

88AQI

Lowest AQI recorded in

August

32AQI

202267AQI

22
8
2
16
3
1
21
9
6
22
2
15
16
30
21
2
1
5
23
1
30
28
2
1
30
82
211
24

Highest AQI recorded in

January

90AQI

Lowest AQI recorded in

June

33AQI

202168AQI

16
13
4
24
13
18
2
27
1
24
7
30
28
3
24
7
11
19
7
24
30
1
23
7
127
173
63

Highest AQI recorded in

February

110AQI

Lowest AQI recorded in

June

30AQI

202057AQI

2
8
3
1
20
16
2
29
1
31
24
7
4
26
3
28
30
1
25
5
111
147
8

Highest AQI recorded in

March

85AQI

Lowest AQI recorded in

July

25AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2021(Avg.)
68AQI
Least Polluted Year Recorded
2020(Avg.)
57AQI

Chiayi's annual 2025 AQI (58) shows an average percentage change of -7.6% (improved AQI) compared to previous years: 2020 (57), 2021 (68), 2022 (67), 2023 (63), 2024 (59).