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+
October Air Quality Analysis
Chiayi, Chiayi, Taiwan
2021
2022
2023
2024
2025
AQI
.
Days
AQI Trends: Highest and Lowest
Highest AQI recorded on
16th Oct 2023
105AQILowest AQI recorded on
13th Oct 2021
26AQISame Day Analysis (22nd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 43 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
Day & Night AQI Trend: 23rd Oct - 24th Oct 2025
Chiayi, Chiayi, Taiwan
AQI
Day
Night
.
5 AM23rd Oct 2025
5 PM
4 AM24th Oct 2025
Day time
Avg. Highest Time
12AMNaNth undefined
AQI
Avg. Lowest Time
12AMNaNth undefined
AQI
Night time
Avg. Highest Time
5PM23rd Oct
62AQI
Avg. Lowest Time
7AM23rd Oct
22AQI
In the last 24 hours,
Chiayi's AQI reached its highest point of 62 at 5 PM during the Night, while the lowest point, 22, was recorded at 7 AM during the Night between 23rd Oct and 24th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Chiayi, Chiayi, Taiwan
SepOct
24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th
Day
Night
24th Sep 2025485 AMAQI
24th Sep 2025486 AMAQI
24th Sep 2025487 AMAQI
24th Sep 2025268 AMAQI
24th Sep 2025169 AMAQI
24th Sep 20251810 AMAQI
24th Sep 20251811 AMAQI
24th Sep 20251812 PMAQI
24th Sep 2025181 PMAQI
24th Sep 2025202 PMAQI
24th Sep 2025193 PMAQI
24th Sep 2025204 PMAQI
24th Sep 2025235 PMAQI
24th Sep 2025316 PMAQI
24th Sep 2025397 PMAQI
24th Sep 2025438 PMAQI
24th Sep 2025459 PMAQI
24th Sep 20254310 PMAQI
24th Sep 20254211 PMAQI
25th Sep 20254112 AMAQI
25th Sep 2025501 AMAQI
25th Sep 2025502 AMAQI
25th Sep 2025483 AMAQI
25th Sep 2025444 AMAQI
29°C26/33°C
25th Sep 2025445 AMAQI
25th Sep 2025446 AMAQI
25th Sep 2025437 AMAQI
25th Sep 2025298 AMAQI
25th Sep 2025269 AMAQI
25th Sep 20252910 AMAQI
25th Sep 20253011 AMAQI
25th Sep 20253412 PMAQI
25th Sep 2025421 PMAQI
25th Sep 2025452 PMAQI
25th Sep 2025433 PMAQI
25th Sep 2025394 PMAQI
25th Sep 2025395 PMAQI
25th Sep 2025416 PMAQI
25th Sep 2025437 PMAQI
25th Sep 2025478 PMAQI
25th Sep 2025389 PMAQI
25th Sep 20253410 PMAQI
25th Sep 20254011 PMAQI
26th Sep 20254312 AMAQI
26th Sep 2025351 AMAQI
26th Sep 2025302 AMAQI
26th Sep 2025333 AMAQI
26th Sep 2025354 AMAQI
30°C27/33°C
26th Sep 2025365 AMAQI
26th Sep 2025396 AMAQI
26th Sep 2025447 AMAQI
26th Sep 2025488 AMAQI
26th Sep 2025529 AMAQI
26th Sep 20255310 AMAQI
26th Sep 20255811 AMAQI
26th Sep 20254712 PMAQI
26th Sep 2025481 PMAQI
26th Sep 2025522 PMAQI
26th Sep 2025543 PMAQI
26th Sep 2025574 PMAQI
26th Sep 2025605 PMAQI
26th Sep 2025636 PMAQI
26th Sep 2025667 PMAQI
26th Sep 2025838 PMAQI
26th Sep 2025899 PMAQI
26th Sep 20257310 PMAQI
26th Sep 20256411 PMAQI
27th Sep 20256112 AMAQI
27th Sep 2025561 AMAQI
27th Sep 2025542 AMAQI
27th Sep 2025563 AMAQI
27th Sep 2025554 AMAQI
30°C28/33°C
27th Sep 2025505 AMAQI
27th Sep 2025416 AMAQI
27th Sep 2025327 AMAQI
27th Sep 2025358 AMAQI
27th Sep 2025349 AMAQI
27th Sep 20253010 AMAQI
27th Sep 20253311 AMAQI
27th Sep 20253412 PMAQI
27th Sep 2025301 PMAQI
27th Sep 2025372 PMAQI
27th Sep 2025383 PMAQI
27th Sep 2025374 PMAQI
27th Sep 2025405 PMAQI
27th Sep 2025416 PMAQI
27th Sep 2025397 PMAQI
27th Sep 2025408 PMAQI
27th Sep 2025469 PMAQI
27th Sep 20255210 PMAQI
27th Sep 20254211 PMAQI
28th Sep 20253912 AMAQI
28th Sep 2025351 AMAQI
28th Sep 2025302 AMAQI
28th Sep 2025283 AMAQI
28th Sep 2025304 AMAQI
31°C28/34°C
28th Sep 2025305 AMAQI
28th Sep 2025296 AMAQI
28th Sep 2025317 AMAQI
28th Sep 2025348 AMAQI
28th Sep 2025369 AMAQI
28th Sep 20253810 AMAQI
28th Sep 20254211 AMAQI
28th Sep 20254312 PMAQI
28th Sep 2025401 PMAQI
28th Sep 2025392 PMAQI
28th Sep 2025413 PMAQI
28th Sep 2025394 PMAQI
28th Sep 2025365 PMAQI
28th Sep 2025366 PMAQI
28th Sep 2025417 PMAQI
28th Sep 2025408 PMAQI
28th Sep 2025449 PMAQI
28th Sep 20254710 PMAQI
28th Sep 20254611 PMAQI
29th Sep 20254712 AMAQI
29th Sep 2025411 AMAQI
29th Sep 2025362 AMAQI
29th Sep 2025393 AMAQI
29th Sep 2025484 AMAQI
30°C29/32°C
29th Sep 2025465 AMAQI
29th Sep 2025366 AMAQI
29th Sep 2025337 AMAQI
29th Sep 2025318 AMAQI
29th Sep 2025359 AMAQI
29th Sep 20254110 AMAQI
29th Sep 20254411 AMAQI
29th Sep 20254012 PMAQI
29th Sep 2025431 PMAQI
29th Sep 2025502 PMAQI
29th Sep 2025403 PMAQI
29th Sep 2025404 PMAQI
29th Sep 2025385 PMAQI
29th Sep 2025386 PMAQI
29th Sep 2025387 PMAQI
29th Sep 2025438 PMAQI
29th Sep 2025459 PMAQI
29th Sep 20254910 PMAQI
29th Sep 20255111 PMAQI
30th Sep 20254412 AMAQI
30th Sep 2025391 AMAQI
30th Sep 2025462 AMAQI
30th Sep 2025493 AMAQI
30th Sep 2025494 AMAQI
30°C28/33°C
30th Sep 2025465 AMAQI
30th Sep 2025466 AMAQI
30th Sep 2025537 AMAQI
30th Sep 2025528 AMAQI
30th Sep 2025489 AMAQI
30th Sep 20254810 AMAQI
30th Sep 20255311 AMAQI
30th Sep 20255612 PMAQI
30th Sep 2025571 PMAQI
30th Sep 2025562 PMAQI
30th Sep 2025553 PMAQI
30th Sep 2025514 PMAQI
30th Sep 2025365 PMAQI
30th Sep 2025396 PMAQI
30th Sep 2025417 PMAQI
30th Sep 2025468 PMAQI
30th Sep 2025389 PMAQI
30th Sep 20254510 PMAQI
30th Sep 20255011 PMAQI
1st Oct 20255412 AMAQI
1st Oct 2025521 AMAQI
1st Oct 2025462 AMAQI
1st Oct 2025503 AMAQI
1st Oct 2025514 AMAQI
30°C28/32°C
1st Oct 2025495 AMAQI
1st Oct 2025516 AMAQI
1st Oct 2025537 AMAQI
1st Oct 2025558 AMAQI
1st Oct 2025529 AMAQI
1st Oct 20254910 AMAQI
1st Oct 20255511 AMAQI
1st Oct 20255512 PMAQI
1st Oct 2025511 PMAQI
1st Oct 2025512 PMAQI
1st Oct 2025693 PMAQI
1st Oct 2025674 PMAQI
1st Oct 2025685 PMAQI
1st Oct 2025626 PMAQI
1st Oct 2025627 PMAQI
1st Oct 2025588 PMAQI
1st Oct 2025589 PMAQI
1st Oct 20256010 PMAQI
1st Oct 20256011 PMAQI
2nd Oct 20255912 AMAQI
2nd Oct 2025631 AMAQI
2nd Oct 2025662 AMAQI
2nd Oct 2025653 AMAQI
2nd Oct 2025644 AMAQI
30°C28/32°C
2nd Oct 2025605 AMAQI
2nd Oct 2025606 AMAQI
2nd Oct 2025607 AMAQI
2nd Oct 2025628 AMAQI
2nd Oct 2025629 AMAQI
2nd Oct 20256510 AMAQI
2nd Oct 20256411 AMAQI
2nd Oct 20256112 PMAQI
2nd Oct 2025541 PMAQI
2nd Oct 2025492 PMAQI
2nd Oct 2025523 PMAQI
2nd Oct 2025504 PMAQI
2nd Oct 2025465 PMAQI
2nd Oct 2025466 PMAQI
2nd Oct 2025477 PMAQI
2nd Oct 2025518 PMAQI
2nd Oct 2025609 PMAQI
2nd Oct 20256210 PMAQI
2nd Oct 20256011 PMAQI
3rd Oct 20255412 AMAQI
3rd Oct 2025561 AMAQI
3rd Oct 2025582 AMAQI
3rd Oct 2025613 AMAQI
3rd Oct 2025584 AMAQI
30°C28/32°C
3rd Oct 2025565 AMAQI
3rd Oct 2025576 AMAQI
3rd Oct 2025587 AMAQI
3rd Oct 2025578 AMAQI
3rd Oct 2025569 AMAQI
3rd Oct 20256010 AMAQI
3rd Oct 20256611 AMAQI
3rd Oct 20256812 PMAQI
3rd Oct 2025671 PMAQI
3rd Oct 2025672 PMAQI
3rd Oct 2025683 PMAQI
3rd Oct 2025664 PMAQI
3rd Oct 2025675 PMAQI
3rd Oct 2025686 PMAQI
3rd Oct 2025607 PMAQI
3rd Oct 2025758 PMAQI
3rd Oct 2025789 PMAQI
3rd Oct 20258210 PMAQI
3rd Oct 20258511 PMAQI
4th Oct 20259112 AMAQI
4th Oct 2025971 AMAQI
4th Oct 2025962 AMAQI
4th Oct 2025853 AMAQI
4th Oct 2025744 AMAQI
30°C28/33°C
4th Oct 2025685 AMAQI
4th Oct 2025686 AMAQI
4th Oct 2025697 AMAQI
4th Oct 2025658 AMAQI
4th Oct 2025679 AMAQI
4th Oct 20256910 AMAQI
4th Oct 20257711 AMAQI
4th Oct 20257912 PMAQI
4th Oct 2025801 PMAQI
4th Oct 2025842 PMAQI
4th Oct 2025773 PMAQI
4th Oct 2025744 PMAQI
4th Oct 2025785 PMAQI
4th Oct 2025756 PMAQI
4th Oct 2025797 PMAQI
4th Oct 2025768 PMAQI
4th Oct 2025739 PMAQI
4th Oct 20258110 PMAQI
4th Oct 20259011 PMAQI
5th Oct 20259812 AMAQI
5th Oct 2025941 AMAQI
5th Oct 2025852 AMAQI
5th Oct 2025753 AMAQI
5th Oct 2025684 AMAQI
31°C29/34°C
5th Oct 2025695 AMAQI
5th Oct 2025696 AMAQI
5th Oct 2025637 AMAQI
5th Oct 2025628 AMAQI
5th Oct 2025629 AMAQI
5th Oct 20256310 AMAQI
5th Oct 20256811 AMAQI
5th Oct 20257612 PMAQI
5th Oct 2025751 PMAQI
5th Oct 2025692 PMAQI
5th Oct 2025663 PMAQI
5th Oct 2025644 PMAQI
5th Oct 2025725 PMAQI
5th Oct 2025676 PMAQI
5th Oct 2025657 PMAQI
5th Oct 2025708 PMAQI
5th Oct 2025669 PMAQI
5th Oct 20257010 PMAQI
5th Oct 20257911 PMAQI
6th Oct 20259012 AMAQI
6th Oct 20251021 AMAQI
6th Oct 2025922 AMAQI
6th Oct 2025863 AMAQI
6th Oct 2025834 AMAQI
31°C29/34°C
6th Oct 2025785 AMAQI
6th Oct 2025786 AMAQI
6th Oct 2025737 AMAQI
6th Oct 2025728 AMAQI
6th Oct 2025729 AMAQI
6th Oct 20257110 AMAQI
6th Oct 20257711 AMAQI
6th Oct 20257812 PMAQI
6th Oct 2025751 PMAQI
6th Oct 2025722 PMAQI
6th Oct 2025713 PMAQI
6th Oct 2025694 PMAQI
6th Oct 2025685 PMAQI
6th Oct 2025676 PMAQI
6th Oct 2025627 PMAQI
6th Oct 2025618 PMAQI
6th Oct 2025649 PMAQI
6th Oct 20257810 PMAQI
6th Oct 20258311 PMAQI
7th Oct 20258312 AMAQI
7th Oct 2025781 AMAQI
31°C29/34°C
7th Oct 2025657 PMAQI
7th Oct 2025598 PMAQI
7th Oct 2025679 PMAQI
7th Oct 20256610 PMAQI
7th Oct 20257311 PMAQI
8th Oct 20257212 AMAQI
8th Oct 2025691 AMAQI
8th Oct 2025712 AMAQI
8th Oct 2025693 AMAQI
8th Oct 2025664 AMAQI
31°C28/34°C
8th Oct 2025695 AMAQI
8th Oct 2025726 AMAQI
8th Oct 2025697 AMAQI
8th Oct 2025718 AMAQI
8th Oct 2025769 AMAQI
8th Oct 20257810 AMAQI
8th Oct 20257211 AMAQI
8th Oct 20256512 PMAQI
8th Oct 2025621 PMAQI
8th Oct 2025662 PMAQI
8th Oct 2025683 PMAQI
8th Oct 2025704 PMAQI
8th Oct 2025695 PMAQI
8th Oct 2025676 PMAQI
8th Oct 2025687 PMAQI
8th Oct 2025718 PMAQI
8th Oct 2025669 PMAQI
8th Oct 20257210 PMAQI
8th Oct 20257711 PMAQI
9th Oct 20257912 AMAQI
9th Oct 2025791 AMAQI
9th Oct 2025792 AMAQI
9th Oct 2025763 AMAQI
9th Oct 2025714 AMAQI
31°C28/34°C
9th Oct 2025725 AMAQI
9th Oct 2025746 AMAQI
9th Oct 2025697 AMAQI
9th Oct 2025728 AMAQI
9th Oct 2025729 AMAQI
9th Oct 20257610 AMAQI
9th Oct 20257111 AMAQI
9th Oct 20256712 PMAQI
9th Oct 2025631 PMAQI
9th Oct 2025652 PMAQI
9th Oct 2025703 PMAQI
9th Oct 2025704 PMAQI
9th Oct 2025705 PMAQI
9th Oct 2025716 PMAQI
9th Oct 2025717 PMAQI
9th Oct 2025788 PMAQI
9th Oct 2025839 PMAQI
9th Oct 20257910 PMAQI
9th Oct 20257611 PMAQI
10th Oct 20257912 AMAQI
10th Oct 2025661 AMAQI
10th Oct 2025682 AMAQI
10th Oct 2025653 AMAQI
10th Oct 2025664 AMAQI
31°C29/32°C
10th Oct 2025685 AMAQI
10th Oct 2025736 AMAQI
10th Oct 2025687 AMAQI
10th Oct 2025698 AMAQI
10th Oct 2025749 AMAQI
10th Oct 20257210 AMAQI
10th Oct 20256611 AMAQI
10th Oct 20256612 PMAQI
10th Oct 2025661 PMAQI
10th Oct 2025662 PMAQI
10th Oct 2025683 PMAQI
10th Oct 2025684 PMAQI
10th Oct 2025785 PMAQI
10th Oct 2025736 PMAQI
10th Oct 2025657 PMAQI
10th Oct 2025708 PMAQI
10th Oct 2025749 PMAQI
10th Oct 20258110 PMAQI
10th Oct 20257911 PMAQI
11th Oct 20257412 AMAQI
11th Oct 2025761 AMAQI
11th Oct 2025752 AMAQI
11th Oct 2025793 AMAQI
11th Oct 2025734 AMAQI
31°C29/33°C
11th Oct 2025635 AMAQI
11th Oct 2025636 AMAQI
11th Oct 2025677 AMAQI
11th Oct 2025758 AMAQI
11th Oct 2025729 AMAQI
11th Oct 20256310 AMAQI
11th Oct 20256411 AMAQI
11th Oct 20256712 PMAQI
11th Oct 2025681 PMAQI
11th Oct 2025642 PMAQI
11th Oct 2025613 PMAQI
11th Oct 2025594 PMAQI
11th Oct 2025655 PMAQI
11th Oct 2025636 PMAQI
11th Oct 2025617 PMAQI
11th Oct 2025578 PMAQI
11th Oct 2025579 PMAQI
11th Oct 20255910 PMAQI
11th Oct 20256811 PMAQI
12th Oct 20256912 AMAQI
12th Oct 2025731 AMAQI
12th Oct 2025702 AMAQI
12th Oct 2025683 AMAQI
12th Oct 2025674 AMAQI
30°C29/32°C
12th Oct 2025725 AMAQI
12th Oct 2025706 AMAQI
12th Oct 2025687 AMAQI
12th Oct 2025698 AMAQI
12th Oct 2025779 AMAQI
12th Oct 20257610 AMAQI
12th Oct 20257711 AMAQI
12th Oct 20257312 PMAQI
12th Oct 2025731 PMAQI
12th Oct 2025722 PMAQI
12th Oct 2025663 PMAQI
12th Oct 2025694 PMAQI
12th Oct 2025705 PMAQI
12th Oct 2025746 PMAQI
12th Oct 2025697 PMAQI
12th Oct 2025578 PMAQI
12th Oct 2025549 PMAQI
12th Oct 20256610 PMAQI
12th Oct 20257111 PMAQI
13th Oct 20257112 AMAQI
13th Oct 2025771 AMAQI
13th Oct 2025792 AMAQI
13th Oct 2025773 AMAQI
13th Oct 2025734 AMAQI
30°C28/32°C
13th Oct 2025735 AMAQI
13th Oct 2025666 AMAQI
13th Oct 2025677 AMAQI
13th Oct 2025688 AMAQI
13th Oct 2025729 AMAQI
13th Oct 20257310 AMAQI
13th Oct 20258211 AMAQI
13th Oct 20258212 PMAQI
13th Oct 2025791 PMAQI
13th Oct 2025802 PMAQI
13th Oct 2025803 PMAQI
13th Oct 2025734 PMAQI
13th Oct 2025735 PMAQI
13th Oct 2025696 PMAQI
13th Oct 2025647 PMAQI
13th Oct 2025688 PMAQI
13th Oct 2025689 PMAQI
13th Oct 20256710 PMAQI
13th Oct 20257611 PMAQI
14th Oct 20257812 AMAQI
14th Oct 2025751 AMAQI
14th Oct 2025782 AMAQI
14th Oct 2025733 AMAQI
14th Oct 2025704 AMAQI
31°C28/34°C
14th Oct 2025725 AMAQI
14th Oct 2025666 AMAQI
14th Oct 2025687 AMAQI
14th Oct 2025698 AMAQI
14th Oct 2025779 AMAQI
14th Oct 20258110 AMAQI
14th Oct 20258011 AMAQI
14th Oct 20257912 PMAQI
14th Oct 2025741 PMAQI
14th Oct 2025802 PMAQI
14th Oct 2025853 PMAQI
14th Oct 2025804 PMAQI
14th Oct 2025815 PMAQI
14th Oct 2025816 PMAQI
14th Oct 2025767 PMAQI
14th Oct 2025858 PMAQI
14th Oct 2025899 PMAQI
14th Oct 20258210 PMAQI
14th Oct 20257811 PMAQI
15th Oct 20258112 AMAQI
15th Oct 2025751 AMAQI
15th Oct 2025772 AMAQI
15th Oct 2025823 AMAQI
15th Oct 2025774 AMAQI
31°C28/34°C
15th Oct 2025795 AMAQI
15th Oct 2025766 AMAQI
15th Oct 2025787 AMAQI
15th Oct 2025848 AMAQI
15th Oct 2025849 AMAQI
15th Oct 20258710 AMAQI
15th Oct 20259211 AMAQI
15th Oct 20258912 PMAQI
15th Oct 2025931 PMAQI
15th Oct 2025952 PMAQI
15th Oct 2025773 PMAQI
15th Oct 2025734 PMAQI
15th Oct 2025745 PMAQI
15th Oct 2025726 PMAQI
15th Oct 2025687 PMAQI
15th Oct 2025698 PMAQI
15th Oct 2025659 PMAQI
15th Oct 20257010 PMAQI
15th Oct 20257911 PMAQI
16th Oct 20257412 AMAQI
16th Oct 2025691 AMAQI
16th Oct 2025682 AMAQI
16th Oct 2025683 AMAQI
16th Oct 2025664 AMAQI
30°C29/33°C
16th Oct 2025685 AMAQI
16th Oct 2025716 AMAQI
16th Oct 2025717 AMAQI
16th Oct 2025748 AMAQI
16th Oct 2025769 AMAQI
16th Oct 20256710 AMAQI
16th Oct 20257011 AMAQI
16th Oct 20257612 PMAQI
16th Oct 2025801 PMAQI
16th Oct 2025732 PMAQI
16th Oct 2025693 PMAQI
16th Oct 2025764 PMAQI
16th Oct 2025825 PMAQI
16th Oct 2025856 PMAQI
16th Oct 2025957 PMAQI
16th Oct 2025978 PMAQI
16th Oct 2025869 PMAQI
16th Oct 20258210 PMAQI
16th Oct 20258011 PMAQI
17th Oct 20258412 AMAQI
17th Oct 2025901 AMAQI
17th Oct 2025882 AMAQI
17th Oct 2025903 AMAQI
17th Oct 2025834 AMAQI
30°C28/33°C
17th Oct 2025815 AMAQI
17th Oct 2025856 AMAQI
17th Oct 2025837 AMAQI
17th Oct 2025848 AMAQI
17th Oct 2025949 AMAQI
17th Oct 20259410 AMAQI
17th Oct 20258611 AMAQI
17th Oct 20258912 PMAQI
17th Oct 2025841 PMAQI
17th Oct 2025832 PMAQI
17th Oct 2025753 PMAQI
17th Oct 2025794 PMAQI
17th Oct 2025785 PMAQI
17th Oct 2025746 PMAQI
17th Oct 2025727 PMAQI
17th Oct 2025748 PMAQI
17th Oct 2025759 PMAQI
17th Oct 20258910 PMAQI
17th Oct 202510211 PMAQI
18th Oct 202510612 AMAQI
18th Oct 2025921 AMAQI
18th Oct 2025822 AMAQI
18th Oct 2025813 AMAQI
18th Oct 2025804 AMAQI
31°C29/33°C
18th Oct 2025815 AMAQI
18th Oct 2025816 AMAQI
18th Oct 2025677 AMAQI
18th Oct 2025678 AMAQI
18th Oct 2025669 AMAQI
18th Oct 20256610 AMAQI
18th Oct 20257011 AMAQI
18th Oct 20258612 PMAQI
18th Oct 2025921 PMAQI
18th Oct 2025922 PMAQI
18th Oct 2025973 PMAQI
18th Oct 2025904 PMAQI
18th Oct 20251055 PMAQI
18th Oct 2025956 PMAQI
18th Oct 2025847 PMAQI
18th Oct 2025838 PMAQI
18th Oct 2025889 PMAQI
18th Oct 20257910 PMAQI
18th Oct 20258111 PMAQI
19th Oct 20259012 AMAQI
19th Oct 20251001 AMAQI
19th Oct 2025982 AMAQI
19th Oct 2025943 AMAQI
19th Oct 2025944 AMAQI
31°C28/34°C
19th Oct 20251015 AMAQI
19th Oct 2025866 AMAQI
19th Oct 2025847 AMAQI
19th Oct 2025928 AMAQI
19th Oct 2025979 AMAQI
19th Oct 20259610 AMAQI
19th Oct 20259411 AMAQI
19th Oct 20259912 PMAQI
19th Oct 2025961 PMAQI
19th Oct 2025982 PMAQI
19th Oct 2025963 PMAQI
19th Oct 2025974 PMAQI
19th Oct 2025915 PMAQI
19th Oct 2025856 PMAQI
19th Oct 2025867 PMAQI
19th Oct 2025948 PMAQI
19th Oct 2025939 PMAQI
19th Oct 20259210 PMAQI
19th Oct 20258811 PMAQI
20th Oct 20257112 AMAQI
20th Oct 2025601 AMAQI
20th Oct 2025582 AMAQI
20th Oct 2025583 AMAQI
20th Oct 2025564 AMAQI
30°C28/32°C
20th Oct 2025555 AMAQI
20th Oct 2025586 AMAQI
20th Oct 2025597 AMAQI
20th Oct 2025578 AMAQI
20th Oct 2025599 AMAQI
20th Oct 20256010 AMAQI
20th Oct 20256211 AMAQI
20th Oct 20255912 PMAQI
20th Oct 2025591 PMAQI
20th Oct 2025602 PMAQI
20th Oct 2025603 PMAQI
20th Oct 2025654 PMAQI
20th Oct 2025715 PMAQI
20th Oct 2025636 PMAQI
20th Oct 2025617 PMAQI
20th Oct 2025608 PMAQI
20th Oct 2025619 PMAQI
20th Oct 20256110 PMAQI
20th Oct 20256411 PMAQI
21st Oct 20256012 AMAQI
21st Oct 2025611 AMAQI
21st Oct 2025632 AMAQI
21st Oct 2025623 AMAQI
21st Oct 2025624 AMAQI
26°C25/28°C
21st Oct 2025555 AMAQI
21st Oct 2025556 AMAQI
21st Oct 2025577 AMAQI
21st Oct 2025548 AMAQI
21st Oct 2025559 AMAQI
21st Oct 20255710 AMAQI
21st Oct 20255911 AMAQI
21st Oct 20255812 PMAQI
21st Oct 2025621 PMAQI
21st Oct 2025572 PMAQI
21st Oct 2025553 PMAQI
21st Oct 2025584 PMAQI
21st Oct 2025665 PMAQI
21st Oct 2025786 PMAQI
21st Oct 2025867 PMAQI
21st Oct 2025778 PMAQI
21st Oct 2025679 PMAQI
21st Oct 20256210 PMAQI
21st Oct 20255811 PMAQI
22nd Oct 20255612 AMAQI
22nd Oct 2025331 AMAQI
22nd Oct 2025302 AMAQI
22nd Oct 2025303 AMAQI
22nd Oct 2025294 AMAQI
25°C24/28°C
22nd Oct 2025185 AMAQI
22nd Oct 2025206 AMAQI
22nd Oct 2025197 AMAQI
22nd Oct 2025218 AMAQI
22nd Oct 2025219 AMAQI
22nd Oct 20253210 AMAQI
22nd Oct 20254311 AMAQI
22nd Oct 20254512 PMAQI
22nd Oct 2025571 PMAQI
22nd Oct 2025542 PMAQI
22nd Oct 2025533 PMAQI
22nd Oct 2025514 PMAQI
22nd Oct 2025555 PMAQI
22nd Oct 2025546 PMAQI
22nd Oct 2025507 PMAQI
22nd Oct 2025508 PMAQI
22nd Oct 2025469 PMAQI
22nd Oct 20254610 PMAQI
22nd Oct 20254811 PMAQI
23rd Oct 20254812 AMAQI
23rd Oct 2025371 AMAQI
23rd Oct 2025352 AMAQI
23rd Oct 2025323 AMAQI
23rd Oct 2025374 AMAQI
25°C23/29°C
23rd Oct 2025325 AMAQI
23rd Oct 2025256 AMAQI
23rd Oct 2025227 AMAQI
23rd Oct 2025268 AMAQI
23rd Oct 2025269 AMAQI
23rd Oct 20252410 AMAQI
23rd Oct 20252711 AMAQI
23rd Oct 20253412 PMAQI
23rd Oct 2025431 PMAQI
23rd Oct 2025572 PMAQI
23rd Oct 2025573 PMAQI
23rd Oct 2025614 PMAQI
23rd Oct 2025625 PMAQI
23rd Oct 2025626 PMAQI
23rd Oct 2025617 PMAQI
23rd Oct 2025618 PMAQI
23rd Oct 2025609 PMAQI
23rd Oct 20256010 PMAQI
23rd Oct 20255711 PMAQI
24th Oct 20255712 AMAQI
24th Oct 2025561 AMAQI
24th Oct 2025552 AMAQI
24th Oct 2025463 AMAQI
24th Oct 2025374 AMAQI
--°C/°C
24th Oct 2025345 AMAQI
5 AM24th Oct 2025396 AMAQI
24th Oct 2025367 AMAQI
11 AM
5 PM
11 PM
4 AM
--°C/°C
Day time
Avg. Highest Time
11 AM - 5 PM
63AQI
7 hours / Day
210 hours / Month
Avg. Lowest Time
5 AM - 10 AM
59AQI
6 hours / Day
180 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 11 AM to 5 PM (Avg. 63), while the lowest AQI was between 5 AM to 10 AM (Avg. 59).
Night time
Avg. Highest Time
12 AM - 1 AM
67AQI
2 hours / Day
60 hours / Month
Avg. Lowest Time
4 AM
60AQI
1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 1 AM (Avg. 67), while the lowest AQI was between 4 AM to 4 AM (Avg. 60).
2025 Days Vs Air Quality
Chiayi, Chiayi, Taiwan
2025
43%
128
56%
165
0.6%
2
Total number of days with different AQI categories in last 296 days in 2025 (69 days remaining)
Good
128 DaysModerate
165 DaysPoor
2 DaysUnhealthy
0 DaysSevere
0 DaysHazardous
0 DaysUnder WHO’s Safe Air Quality Limits: 43%
Health Risk Level:
Significant
In 2025, 43% of 296 days were within WHO’s safe air quality limits, and 57% 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
112AQI
2nd January 2025
69AQI
69AQI
3rd January 2025
70AQI
70AQI
4th January 2025
65AQI
65AQI
5th January 2025
73AQI
73AQI
6th January 2025
83AQI
83AQI
7th January 2025
90AQI
90AQI
8th January 2025
80AQI
80AQI
9th January 2025
79AQI
79AQI
10th January 2025
67AQI
67AQI
11th January 2025
63AQI
63AQI
12th January 2025
63AQI
63AQI
13th January 2025
65AQI
65AQI
14th January 2025
82AQI
82AQI
15th January 2025
78AQI
78AQI
16th January 2025
73AQI
73AQI
17th January 2025
73AQI
73AQI
18th January 2025
78AQI
78AQI
19th January 2025
73AQI
73AQI
20th January 2025
79AQI
79AQI
21st January 2025
91AQI
91AQI
22nd January 2025
100AQI
100AQI
23rd January 2025
95AQI
95AQI
24th January 2025
89AQI
89AQI
25th January 2025
96AQI
96AQI
26th January 2025
82AQI
82AQI
27th January 2025
60AQI
60AQI
28th January 2025
69AQI
69AQI
29th January 2025
69AQI
69AQI
30th January 2025
76AQI
76AQI
31st January 2025
86AQI
86AQI
1st February 2025
64AQI
64AQI
2nd February 2025
70AQI
70AQI
3rd February 2025
61AQI
61AQI
4th February 2025
72AQI
72AQI
5th February 2025
83AQI
83AQI
6th February 2025
95AQI
95AQI
7th February 2025
69AQI
69AQI
8th February 2025
70AQI
70AQI
9th February 2025
59AQI
59AQI
10th February 2025
63AQI
63AQI
11th February 2025
74AQI
74AQI
12th February 2025
69AQI
69AQI
13th February 2025
55AQI
55AQI
14th February 2025
71AQI
71AQI
15th February 2025
59AQI
59AQI
16th February 2025
80AQI
80AQI
17th February 2025
94AQI
94AQI
18th February 2025
95AQI
95AQI
19th February 2025
85AQI
85AQI
20th February 2025
99AQI
99AQI
21st February 2025
64AQI
64AQI
22nd February 2025
76AQI
76AQI
23rd February 2025
55AQI
55AQI
24th February 2025
68AQI
68AQI
25th February 2025
81AQI
81AQI
26th February 2025
99AQI
99AQI
27th February 2025
106AQI
106AQI
28th February 2025
74AQI
74AQI
1st March 2025
74AQI
74AQI
2nd March 2025
64AQI
64AQI
3rd March 2025
60AQI
60AQI
4th March 2025
59AQI
59AQI
5th March 2025
54AQI
54AQI
6th March 2025
52AQI
52AQI
7th March 2025
64AQI
64AQI
8th March 2025
68AQI
68AQI
9th March 2025
70AQI
70AQI
10th March 2025
91AQI
91AQI
11th March 2025
93AQI
93AQI
12th March 2025
78AQI
78AQI
13th March 2025
72AQI
72AQI
14th March 2025
81AQI
81AQI
15th March 2025
72AQI
72AQI
16th March 2025
58AQI
58AQI
17th March 2025
82AQI
82AQI
18th March 2025
66AQI
66AQI
19th March 2025
72AQI
72AQI
20th March 2025
70AQI
70AQI
21st March 2025
76AQI
76AQI
22nd March 2025
76AQI
76AQI
23rd March 2025
74AQI
74AQI
24th March 2025
69AQI
69AQI
25th March 2025
68AQI
68AQI
26th March 2025
66AQI
66AQI
27th March 2025
61AQI
61AQI
28th March 2025
71AQI
71AQI
29th March 2025
64AQI
64AQI
30th March 2025
56AQI
56AQI
31st March 2025
60AQI
60AQI
1st April 2025
49AQI
49AQI
2nd April 2025
68AQI
68AQI
3rd April 2025
71AQI
71AQI
4th April 2025
73AQI
73AQI
5th April 2025
80AQI
80AQI
6th April 2025
70AQI
70AQI
7th April 2025
72AQI
72AQI
8th April 2025
74AQI
74AQI
9th April 2025
68AQI
68AQI
10th April 2025
68AQI
68AQI
11th April 2025
66AQI
66AQI
12th April 2025
58AQI
58AQI
13th April 2025
79AQI
79AQI
14th April 2025
70AQI
70AQI
15th April 2025
83AQI
83AQI
16th April 2025
80AQI
80AQI
17th April 2025
67AQI
67AQI
18th April 2025
62AQI
62AQI
19th April 2025
61AQI
61AQI
20th April 2025
60AQI
60AQI
21st April 2025
61AQI
61AQI
22nd April 2025
55AQI
55AQI
23rd April 2025
57AQI
57AQI
24th April 2025
55AQI
55AQI
25th April 2025
55AQI
55AQI
26th April 2025
68AQI
68AQI
27th April 2025
66AQI
66AQI
28th April 2025
59AQI
59AQI
29th April 2025
72AQI
72AQI
30th April 2025
63AQI
63AQI
1st May 2025
64AQI
64AQI
2nd May 2025
69AQI
69AQI
3rd May 2025
67AQI
67AQI
4th May 2025
70AQI
70AQI
5th May 2025
60AQI
60AQI
6th May 2025
62AQI
62AQI
7th May 2025
58AQI
58AQI
8th May 2025
60AQI
60AQI
9th May 2025
45AQI
45AQI
10th May 2025
38AQI
38AQI
11th May 2025
39AQI
39AQI
12th May 2025
52AQI
52AQI
13th May 2025
53AQI
53AQI
14th May 2025
56AQI
56AQI
15th May 2025
48AQI
48AQI
16th May 2025
50AQI
50AQI
17th May 2025
40AQI
40AQI
18th May 2025
35AQI
35AQI
19th May 2025
35AQI
35AQI
20th May 2025
37AQI
37AQI
21st May 2025
32AQI
32AQI
22nd May 2025
40AQI
40AQI
23rd May 2025
41AQI
41AQI
24th May 2025
43AQI
43AQI
25th May 2025
52AQI
52AQI
26th May 2025
55AQI
55AQI
27th May 2025
53AQI
53AQI
28th May 2025
58AQI
58AQI
29th May 2025
40AQI
40AQI
30th May 2025
51AQI
51AQI
31st May 2025
53AQI
53AQI
1st June 2025
49AQI
49AQI
2nd June 2025
37AQI
37AQI
3rd June 2025
33AQI
33AQI
4th June 2025
37AQI
37AQI
5th June 2025
35AQI
35AQI
6th June 2025
38AQI
38AQI
7th June 2025
36AQI
36AQI
8th June 2025
35AQI
35AQI
9th June 2025
33AQI
33AQI
10th June 2025
39AQI
39AQI
11th June 2025
44AQI
44AQI
12th June 2025
44AQI
44AQI
13th June 2025
31AQI
31AQI
14th June 2025
37AQI
37AQI
15th June 2025
40AQI
40AQI
16th June 2025
34AQI
34AQI
17th June 2025
31AQI
31AQI
18th June 2025
31AQI
31AQI
19th June 2025
31AQI
31AQI
20th June 2025
32AQI
32AQI
21st June 2025
28AQI
28AQI
22nd June 2025
23AQI
23AQI
23rd June 2025
25AQI
25AQI
24th June 2025
27AQI
27AQI
25th June 2025
29AQI
29AQI
26th June 2025
29AQI
29AQI
27th June 2025
29AQI
29AQI
28th June 2025
30AQI
30AQI
29th June 2025
32AQI
32AQI
30th June 2025
35AQI
35AQI
1st July 2025
37AQI
37AQI
2nd July 2025
41AQI
41AQI
3rd July 2025
44AQI
44AQI
4th July 2025
42AQI
42AQI
5th July 2025
36AQI
36AQI
6th July 2025
32AQI
32AQI
7th July 2025
31AQI
31AQI
8th July 2025
39AQI
39AQI
9th July 2025
39AQI
39AQI
10th July 2025
31AQI
31AQI
11th July 2025
35AQI
35AQI
12th July 2025
41AQI
41AQI
13th July 2025
46AQI
46AQI
14th July 2025
48AQI
48AQI
15th July 2025
43AQI
43AQI
16th July 2025
42AQI
42AQI
17th July 2025
43AQI
43AQI
18th July 2025
44AQI
44AQI
19th July 2025
40AQI
40AQI
20th July 2025
34AQI
34AQI
21st July 2025
35AQI
35AQI
22nd July 2025
37AQI
37AQI
23rd July 2025
50AQI
50AQI
24th July 2025
52AQI
52AQI
25th July 2025
48AQI
48AQI
26th July 2025
39AQI
39AQI
27th July 2025
45AQI
45AQI
28th July 2025
34AQI
34AQI
29th July 2025
33AQI
33AQI
30th July 2025
43AQI
43AQI
31st July 2025
42AQI
42AQI
1st August 2025
43AQI
43AQI
2nd August 2025
42AQI
42AQI
3rd August 2025
44AQI
44AQI
4th August 2025
39AQI
39AQI
5th August 2025
47AQI
47AQI
6th August 2025
47AQI
47AQI
7th August 2025
51AQI
51AQI
8th August 2025
53AQI
53AQI
9th August 2025
48AQI
48AQI
10th August 2025
42AQI
42AQI
11th August 2025
41AQI
41AQI
12th August 2025
48AQI
48AQI
13th August 2025
44AQI
44AQI
14th August 2025
38AQI
38AQI
15th August 2025
40AQI
40AQI
16th August 2025
44AQI
44AQI
17th August 2025
38AQI
38AQI
18th August 2025
37AQI
37AQI
19th August 2025
39AQI
39AQI
20th August 2025
39AQI
39AQI
21st August 2025
38AQI
38AQI
22nd August 2025
46AQI
46AQI
23rd August 2025
49AQI
49AQI
24th August 2025
49AQI
49AQI
25th August 2025
49AQI
49AQI
26th August 2025
44AQI
44AQI
27th August 2025
44AQI
44AQI
28th August 2025
46AQI
46AQI
29th August 2025
44AQI
44AQI
30th August 2025
41AQI
41AQI
31st August 2025
45AQI
45AQI
1st September 2025
48AQI
48AQI
2nd September 2025
48AQI
48AQI
3rd September 2025
51AQI
51AQI
4th September 2025
60AQI
60AQI
5th September 2025
58AQI
58AQI
6th September 2025
54AQI
54AQI
7th September 2025
44AQI
44AQI
8th September 2025
40AQI
40AQI
9th September 2025
40AQI
40AQI
10th September 2025
40AQI
40AQI
11th September 2025
43AQI
43AQI
12th September 2025
45AQI
45AQI
13th September 2025
45AQI
45AQI
14th September 2025
46AQI
46AQI
15th September 2025
48AQI
48AQI
16th September 2025
51AQI
51AQI
17th September 2025
50AQI
50AQI
18th September 2025
42AQI
42AQI
19th September 2025
43AQI
43AQI
20th September 2025
38AQI
38AQI
21st September 2025
42AQI
42AQI
22nd September 2025
55AQI
55AQI
23rd September 2025
37AQI
37AQI
24th September 2025
36AQI
36AQI
25th September 2025
41AQI
41AQI
26th September 2025
52AQI
52AQI
27th September 2025
46AQI
46AQI
28th September 2025
38AQI
38AQI
29th September 2025
43AQI
43AQI
30th September 2025
48AQI
48AQI
1st October 2025
55AQI
55AQI
2nd October 2025
58AQI
58AQI
3rd October 2025
64AQI
64AQI
4th October 2025
79AQI
79AQI
5th October 2025
76AQI
76AQI
6th October 2025
79AQI
79AQI
7th October 2025
70AQI
70AQI
8th October 2025
70AQI
70AQI
9th October 2025
74AQI
74AQI
10th October 2025
73AQI
73AQI
11th October 2025
66AQI
66AQI
12th October 2025
69AQI
69AQI
13th October 2025
73AQI
73AQI
14th October 2025
79AQI
79AQI
15th October 2025
78AQI
78AQI
16th October 2025
77AQI
77AQI
17th October 2025
84AQI
84AQI
18th October 2025
88AQI
88AQI
19th October 2025
92AQI
92AQI
20th October 2025
65AQI
65AQI
21st October 2025
63AQI
63AQI
22nd October 2025
43AQI
43AQI
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
44AQI
46AQI
72AQI
No. of days
Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days
202557AQI
30
1
27
1
31
1
29
14
17
30
30
1
29
2
23
7
1
21
128
165
2
Highest AQI recorded in
January78AQI
Lowest AQI recorded in
June34AQI
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
January89AQI
Lowest AQI recorded in
July31AQI
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
February88AQI
Lowest AQI recorded in
August32AQI
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
January90AQI
Lowest AQI recorded in
June33AQI
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
February110AQI
Lowest AQI recorded in
June30AQI
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
March85AQI
Lowest AQI recorded in
July25AQI
Most & Least Polluted Years Over the Last 6 Years
Most Polluted Year Recorded
2021(Avg.)
68AQILeast Polluted Year Recorded
2020(Avg.)
57AQIChiayi's annual 2025 AQI (57) shows an average percentage change of -8.6% (improved AQI) compared to previous years: 2020 (57), 2021 (68), 2022 (67), 2023 (63), 2024 (59).
