Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Erlin, Huatan, Changhua, 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

Erlin, Huatan, Changhua, Taiwan

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
9th Oct 2021
139AQI
Lowest AQI recorded on
16th Oct 2022
26AQI

Same Day Analysis (5th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 76 of Moderate air quality, showing improvement over 2023, 2022 and 2021 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 5th Oct - 6th Oct 2025

Erlin, Huatan, Changhua, Taiwan

AQI
Day
Night
.

5 AM5th Oct 2025

5 PM

4 AM6th Oct 2025

Day time
Avg. Highest Time
12AMNaNth undefined

AQI

Avg. Lowest Time
12AMNaNth undefined

AQI

Night time
Avg. Highest Time
12PM5th Oct

100AQI

Avg. Lowest Time
4PM5th Oct

34AQI

In the last 24 hours,

Erlin's AQI reached its highest point of 100 at 12 PM during the Night, while the lowest point, 34, was recorded at 4 PM during the Night between 5th Oct and 6th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025

Erlin, Huatan, Changhua, Taiwan

SepOct
06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th - 06th06th
Day
Night
6th Sep 2025575 AMAQI
6th Sep 2025546 AMAQI
6th Sep 2025567 AMAQI
6th Sep 2025648 AMAQI
6th Sep 2025449 AMAQI
6th Sep 20255210 AMAQI
6th Sep 20256211 AMAQI
6th Sep 20255512 PMAQI
6th Sep 2025481 PMAQI
6th Sep 2025582 PMAQI
6th Sep 2025553 PMAQI
6th Sep 2025544 PMAQI
6th Sep 2025485 PMAQI
6th Sep 2025506 PMAQI
6th Sep 2025527 PMAQI
6th Sep 2025448 PMAQI
6th Sep 2025449 PMAQI
6th Sep 20255010 PMAQI
6th Sep 20254011 PMAQI
7th Sep 20255012 AMAQI
7th Sep 2025571 AMAQI
7th Sep 2025552 AMAQI
7th Sep 2025543 AMAQI
7th Sep 2025544 AMAQI

31°C28/34°C

7th Sep 2025545 AMAQI
7th Sep 2025536 AMAQI
7th Sep 2025547 AMAQI
7th Sep 2025308 AMAQI
7th Sep 2025369 AMAQI
7th Sep 20254110 AMAQI
7th Sep 20253911 AMAQI
7th Sep 20255012 PMAQI
7th Sep 2025351 PMAQI
7th Sep 2025322 PMAQI
7th Sep 2025303 PMAQI
7th Sep 2025344 PMAQI
7th Sep 2025455 PMAQI
7th Sep 2025426 PMAQI
7th Sep 2025457 PMAQI
7th Sep 2025468 PMAQI
7th Sep 2025409 PMAQI
7th Sep 20254010 PMAQI
7th Sep 20253411 PMAQI
8th Sep 20254412 AMAQI
8th Sep 2025531 AMAQI
8th Sep 2025532 AMAQI
8th Sep 2025523 AMAQI
8th Sep 2025514 AMAQI

30°C28/34°C

8th Sep 2025485 AMAQI
8th Sep 2025526 AMAQI
8th Sep 2025537 AMAQI
8th Sep 2025218 AMAQI
8th Sep 2025209 AMAQI
8th Sep 20251710 AMAQI
8th Sep 20252211 AMAQI
8th Sep 20252912 PMAQI
8th Sep 2025321 PMAQI
8th Sep 2025282 PMAQI
8th Sep 2025263 PMAQI
8th Sep 2025304 PMAQI
8th Sep 2025315 PMAQI
8th Sep 2025306 PMAQI
8th Sep 2025437 PMAQI
8th Sep 2025468 PMAQI
8th Sep 2025439 PMAQI
8th Sep 20254810 PMAQI
8th Sep 20254611 PMAQI
9th Sep 20254812 AMAQI
9th Sep 2025531 AMAQI
9th Sep 2025532 AMAQI
9th Sep 2025503 AMAQI
9th Sep 2025464 AMAQI

30°C26/33°C

9th Sep 2025475 AMAQI
9th Sep 2025436 AMAQI
9th Sep 2025447 AMAQI
9th Sep 2025358 AMAQI
9th Sep 2025309 AMAQI
9th Sep 20252810 AMAQI
9th Sep 20252611 AMAQI
9th Sep 20253412 PMAQI
9th Sep 2025231 PMAQI
9th Sep 2025222 PMAQI
9th Sep 2025263 PMAQI
9th Sep 2025284 PMAQI
9th Sep 2025335 PMAQI
9th Sep 2025376 PMAQI
9th Sep 2025387 PMAQI
9th Sep 2025428 PMAQI
9th Sep 2025399 PMAQI
9th Sep 20254110 PMAQI
9th Sep 20254011 PMAQI
10th Sep 20254812 AMAQI
10th Sep 2025501 AMAQI
10th Sep 2025502 AMAQI
10th Sep 2025513 AMAQI
10th Sep 2025444 AMAQI

30°C28/33°C

10th Sep 2025465 AMAQI
10th Sep 2025466 AMAQI
10th Sep 2025437 AMAQI
10th Sep 2025338 AMAQI
10th Sep 2025289 AMAQI
10th Sep 20253510 AMAQI
10th Sep 20253611 AMAQI
10th Sep 20253512 PMAQI
10th Sep 2025381 PMAQI
10th Sep 2025412 PMAQI
10th Sep 2025393 PMAQI
10th Sep 2025384 PMAQI
10th Sep 2025415 PMAQI
10th Sep 2025446 PMAQI
10th Sep 2025457 PMAQI
10th Sep 2025428 PMAQI
10th Sep 2025409 PMAQI
10th Sep 20253810 PMAQI
10th Sep 20253811 PMAQI
11th Sep 20254412 AMAQI
11th Sep 2025501 AMAQI
11th Sep 2025502 AMAQI
11th Sep 2025483 AMAQI
11th Sep 2025464 AMAQI

30°C28/33°C

11th Sep 2025465 AMAQI
11th Sep 2025486 AMAQI
11th Sep 2025467 AMAQI
11th Sep 2025228 AMAQI
11th Sep 2025269 AMAQI
11th Sep 20252210 AMAQI
11th Sep 20253511 AMAQI
11th Sep 20252812 PMAQI
11th Sep 2025321 PMAQI
11th Sep 2025422 PMAQI
11th Sep 2025353 PMAQI
11th Sep 2025414 PMAQI
11th Sep 2025345 PMAQI
11th Sep 2025396 PMAQI
11th Sep 2025467 PMAQI
11th Sep 2025488 PMAQI
11th Sep 2025489 PMAQI
11th Sep 20254610 PMAQI
11th Sep 20254711 PMAQI
12th Sep 20254712 AMAQI
12th Sep 2025481 AMAQI
12th Sep 2025512 AMAQI
12th Sep 2025483 AMAQI
12th Sep 2025474 AMAQI

30°C28/33°C

12th Sep 2025485 AMAQI
12th Sep 2025486 AMAQI
12th Sep 2025477 AMAQI
12th Sep 2025378 AMAQI
12th Sep 2025439 AMAQI
12th Sep 20253610 AMAQI
12th Sep 20254111 AMAQI
12th Sep 20254012 PMAQI
12th Sep 2025431 PMAQI
12th Sep 2025422 PMAQI
12th Sep 2025403 PMAQI
12th Sep 2025384 PMAQI
12th Sep 2025385 PMAQI
12th Sep 2025406 PMAQI
12th Sep 2025387 PMAQI
12th Sep 2025488 PMAQI
12th Sep 2025469 PMAQI
12th Sep 20254810 PMAQI
12th Sep 20254711 PMAQI
13th Sep 20254912 AMAQI
13th Sep 2025501 AMAQI
13th Sep 2025482 AMAQI
13th Sep 2025483 AMAQI
13th Sep 2025514 AMAQI

30°C28/33°C

13th Sep 2025495 AMAQI
13th Sep 2025516 AMAQI
13th Sep 2025497 AMAQI
13th Sep 2025458 AMAQI
13th Sep 2025389 AMAQI
13th Sep 20254610 AMAQI
13th Sep 20253811 AMAQI
13th Sep 20253612 PMAQI
13th Sep 2025431 PMAQI
13th Sep 2025342 PMAQI
13th Sep 2025343 PMAQI
13th Sep 2025364 PMAQI
13th Sep 2025355 PMAQI
13th Sep 2025356 PMAQI
13th Sep 2025387 PMAQI
13th Sep 2025468 PMAQI
13th Sep 2025519 PMAQI
13th Sep 20255510 PMAQI
13th Sep 20254611 PMAQI
14th Sep 20255212 AMAQI
14th Sep 2025481 AMAQI
14th Sep 2025522 AMAQI
14th Sep 2025483 AMAQI
14th Sep 2025484 AMAQI

30°C28/32°C

14th Sep 2025475 AMAQI
14th Sep 2025466 AMAQI
14th Sep 2025487 AMAQI
14th Sep 2025508 AMAQI
14th Sep 2025479 AMAQI
14th Sep 20253810 AMAQI
14th Sep 20254311 AMAQI
14th Sep 20254512 PMAQI
14th Sep 2025541 PMAQI
14th Sep 2025492 PMAQI
14th Sep 2025463 PMAQI
14th Sep 2025434 PMAQI
14th Sep 2025315 PMAQI
14th Sep 2025406 PMAQI
14th Sep 2025447 PMAQI
14th Sep 2025478 PMAQI
14th Sep 2025449 PMAQI
14th Sep 20254410 PMAQI
14th Sep 20254411 PMAQI
15th Sep 20254912 AMAQI
15th Sep 2025511 AMAQI
15th Sep 2025462 AMAQI
15th Sep 2025483 AMAQI
15th Sep 2025494 AMAQI

30°C28/33°C

15th Sep 2025485 AMAQI
15th Sep 2025506 AMAQI
15th Sep 2025507 AMAQI
15th Sep 2025508 AMAQI
15th Sep 2025559 AMAQI
15th Sep 20255110 AMAQI
15th Sep 20254711 AMAQI
15th Sep 20254412 PMAQI
15th Sep 2025551 PMAQI
15th Sep 2025532 PMAQI
15th Sep 2025503 PMAQI
15th Sep 2025474 PMAQI
15th Sep 2025465 PMAQI
15th Sep 2025466 PMAQI
15th Sep 2025447 PMAQI
15th Sep 2025488 PMAQI
15th Sep 2025489 PMAQI
15th Sep 20254010 PMAQI
15th Sep 20254211 PMAQI
16th Sep 20255212 AMAQI
16th Sep 2025501 AMAQI
16th Sep 2025502 AMAQI
16th Sep 2025503 AMAQI
16th Sep 2025524 AMAQI

30°C28/33°C

16th Sep 2025515 AMAQI
16th Sep 2025506 AMAQI
16th Sep 2025517 AMAQI
16th Sep 2025518 AMAQI
16th Sep 2025589 AMAQI
16th Sep 20255710 AMAQI
16th Sep 20255311 AMAQI
16th Sep 20254712 PMAQI
16th Sep 2025481 PMAQI
16th Sep 2025422 PMAQI
16th Sep 2025413 PMAQI
16th Sep 2025524 PMAQI
16th Sep 2025445 PMAQI
16th Sep 2025386 PMAQI
16th Sep 2025427 PMAQI
16th Sep 2025528 PMAQI
16th Sep 2025539 PMAQI
16th Sep 20255810 PMAQI
16th Sep 20256111 PMAQI
17th Sep 20255612 AMAQI
17th Sep 2025501 AMAQI
17th Sep 2025502 AMAQI
17th Sep 2025503 AMAQI
17th Sep 2025524 AMAQI

30°C28/34°C

17th Sep 2025525 AMAQI
17th Sep 2025526 AMAQI
17th Sep 2025527 AMAQI
17th Sep 2025558 AMAQI
17th Sep 2025559 AMAQI
17th Sep 20255010 AMAQI
17th Sep 20254411 AMAQI
17th Sep 20253812 PMAQI
17th Sep 2025531 PMAQI
17th Sep 2025442 PMAQI
17th Sep 2025553 PMAQI
17th Sep 2025584 PMAQI
17th Sep 2025525 PMAQI
17th Sep 2025566 PMAQI
17th Sep 2025527 PMAQI
17th Sep 2025588 PMAQI
17th Sep 2025669 PMAQI
17th Sep 20256110 PMAQI
17th Sep 20255811 PMAQI
18th Sep 20255512 AMAQI
18th Sep 2025521 AMAQI
18th Sep 2025522 AMAQI
18th Sep 2025523 AMAQI
18th Sep 2025524 AMAQI

30°C28/34°C

18th Sep 2025535 AMAQI
18th Sep 2025526 AMAQI
18th Sep 2025527 AMAQI
18th Sep 2025678 AMAQI
18th Sep 2025649 AMAQI
18th Sep 20256510 AMAQI
18th Sep 20256711 AMAQI
18th Sep 20257012 PMAQI
18th Sep 2025721 PMAQI
18th Sep 2025702 PMAQI
18th Sep 2025633 PMAQI
18th Sep 2025624 PMAQI
18th Sep 2025695 PMAQI
18th Sep 2025586 PMAQI
18th Sep 2025527 PMAQI
18th Sep 2025468 PMAQI
18th Sep 2025389 PMAQI
18th Sep 20253810 PMAQI
18th Sep 20254011 PMAQI
19th Sep 20254212 AMAQI
19th Sep 2025541 AMAQI
19th Sep 2025542 AMAQI
19th Sep 2025543 AMAQI
19th Sep 2025564 AMAQI

29°C27/33°C

19th Sep 2025565 AMAQI
19th Sep 2025566 AMAQI
19th Sep 2025567 AMAQI
19th Sep 2025468 AMAQI
19th Sep 2025449 AMAQI
19th Sep 20255010 AMAQI
19th Sep 20255611 AMAQI
19th Sep 20256112 PMAQI
19th Sep 2025641 PMAQI
19th Sep 2025622 PMAQI
19th Sep 2025633 PMAQI
19th Sep 2025614 PMAQI
19th Sep 2025505 PMAQI
19th Sep 2025316 PMAQI
19th Sep 2025287 PMAQI
19th Sep 2025368 PMAQI
19th Sep 2025359 PMAQI
19th Sep 20253710 PMAQI
19th Sep 20253811 PMAQI
20th Sep 20254812 AMAQI
20th Sep 2025541 AMAQI
20th Sep 2025552 AMAQI
20th Sep 2025553 AMAQI
20th Sep 2025554 AMAQI

29°C27/33°C

20th Sep 2025565 AMAQI
20th Sep 2025556 AMAQI
20th Sep 2025557 AMAQI
20th Sep 2025328 AMAQI
20th Sep 2025229 AMAQI
20th Sep 20252010 AMAQI
20th Sep 20252111 AMAQI
20th Sep 20253112 PMAQI
20th Sep 2025271 PMAQI
20th Sep 2025262 PMAQI
20th Sep 2025203 PMAQI
20th Sep 2025204 PMAQI
20th Sep 2025235 PMAQI
20th Sep 2025246 PMAQI
20th Sep 2025337 PMAQI
20th Sep 2025448 PMAQI
20th Sep 2025449 PMAQI
20th Sep 20254410 PMAQI
20th Sep 20254711 PMAQI
21st Sep 20255212 AMAQI
21st Sep 2025541 AMAQI
21st Sep 2025542 AMAQI
21st Sep 2025533 AMAQI
21st Sep 2025514 AMAQI

28°C26/32°C

21st Sep 2025505 AMAQI
21st Sep 2025516 AMAQI
21st Sep 2025507 AMAQI
21st Sep 2025368 AMAQI
21st Sep 2025329 AMAQI
21st Sep 20254010 AMAQI
21st Sep 20254611 AMAQI
21st Sep 20254612 PMAQI
21st Sep 2025571 PMAQI
21st Sep 2025382 PMAQI
21st Sep 2025453 PMAQI
21st Sep 2025424 PMAQI
21st Sep 2025355 PMAQI
21st Sep 2025376 PMAQI
21st Sep 2025487 PMAQI
21st Sep 2025528 PMAQI
21st Sep 2025529 PMAQI
21st Sep 20255410 PMAQI
21st Sep 20255411 PMAQI
22nd Sep 20255312 AMAQI
22nd Sep 2025521 AMAQI
22nd Sep 2025522 AMAQI
22nd Sep 2025523 AMAQI
22nd Sep 2025524 AMAQI

29°C26/33°C

22nd Sep 2025525 AMAQI
22nd Sep 2025526 AMAQI
22nd Sep 2025527 AMAQI
22nd Sep 2025428 AMAQI
22nd Sep 2025489 AMAQI
22nd Sep 20254610 AMAQI
22nd Sep 20255311 AMAQI
22nd Sep 20255512 PMAQI
22nd Sep 2025531 PMAQI
22nd Sep 2025542 PMAQI
22nd Sep 2025543 PMAQI
22nd Sep 2025564 PMAQI
22nd Sep 2025585 PMAQI
22nd Sep 2025546 PMAQI
22nd Sep 2025547 PMAQI
22nd Sep 2025518 PMAQI
22nd Sep 2025489 PMAQI
22nd Sep 20255210 PMAQI
22nd Sep 20255311 PMAQI
23rd Sep 20255012 AMAQI
23rd Sep 2025521 AMAQI
23rd Sep 2025522 AMAQI
23rd Sep 2025523 AMAQI
23rd Sep 2025534 AMAQI

29°C27/34°C

23rd Sep 2025535 AMAQI
23rd Sep 2025536 AMAQI
23rd Sep 2025537 AMAQI
23rd Sep 2025488 AMAQI
23rd Sep 2025349 AMAQI
23rd Sep 20253910 AMAQI
23rd Sep 20253911 AMAQI
23rd Sep 20253312 PMAQI
23rd Sep 2025291 PMAQI
23rd Sep 2025382 PMAQI
23rd Sep 2025403 PMAQI
23rd Sep 2025494 PMAQI
23rd Sep 2025425 PMAQI
23rd Sep 2025416 PMAQI
23rd Sep 2025427 PMAQI
23rd Sep 2025458 PMAQI
23rd Sep 2025429 PMAQI
23rd Sep 20254110 PMAQI
23rd Sep 20254211 PMAQI
24th Sep 20254612 AMAQI
24th Sep 2025521 AMAQI
24th Sep 2025522 AMAQI
24th Sep 2025523 AMAQI
24th Sep 2025514 AMAQI

28°C26/30°C

24th Sep 2025525 AMAQI
24th Sep 2025516 AMAQI
24th Sep 2025517 AMAQI
24th Sep 2025298 AMAQI
24th Sep 2025219 AMAQI
24th Sep 20253210 AMAQI
24th Sep 20254211 AMAQI
24th Sep 20254912 PMAQI
24th Sep 2025541 PMAQI
24th Sep 2025482 PMAQI
24th Sep 2025393 PMAQI
24th Sep 2025424 PMAQI
24th Sep 2025475 PMAQI
24th Sep 2025526 PMAQI
24th Sep 2025467 PMAQI
24th Sep 2025468 PMAQI
24th Sep 2025479 PMAQI
24th Sep 20254810 PMAQI
24th Sep 20255011 PMAQI
25th Sep 20254612 AMAQI
25th Sep 2025511 AMAQI
25th Sep 2025522 AMAQI
25th Sep 2025513 AMAQI
25th Sep 2025504 AMAQI

28°C26/31°C

25th Sep 2025505 AMAQI
25th Sep 2025506 AMAQI
25th Sep 2025497 AMAQI
25th Sep 2025468 AMAQI
25th Sep 2025479 AMAQI
25th Sep 20255210 AMAQI
25th Sep 20255211 AMAQI
25th Sep 20255412 PMAQI
25th Sep 2025481 PMAQI
25th Sep 2025522 PMAQI
25th Sep 2025573 PMAQI
25th Sep 2025494 PMAQI
25th Sep 2025455 PMAQI
25th Sep 2025506 PMAQI
25th Sep 2025547 PMAQI
25th Sep 2025538 PMAQI
25th Sep 2025599 PMAQI
25th Sep 20255910 PMAQI
25th Sep 20255511 PMAQI
26th Sep 20255812 AMAQI
26th Sep 2025581 AMAQI
26th Sep 2025562 AMAQI
26th Sep 2025563 AMAQI
26th Sep 2025594 AMAQI

29°C27/32°C

26th Sep 2025645 AMAQI
26th Sep 2025626 AMAQI
26th Sep 2025577 AMAQI
26th Sep 2025558 AMAQI
26th Sep 2025789 AMAQI
26th Sep 20257610 AMAQI
26th Sep 20256111 AMAQI
26th Sep 20255812 PMAQI
26th Sep 2025781 PMAQI
26th Sep 2025792 PMAQI
26th Sep 2025803 PMAQI
26th Sep 20251034 PMAQI
26th Sep 20251275 PMAQI
26th Sep 20251086 PMAQI
26th Sep 20251307 PMAQI
26th Sep 20251638 PMAQI
26th Sep 20251349 PMAQI
26th Sep 20258310 PMAQI
26th Sep 20257111 PMAQI
27th Sep 20256912 AMAQI
27th Sep 2025701 AMAQI
27th Sep 2025642 AMAQI
27th Sep 2025613 AMAQI
27th Sep 2025654 AMAQI

30°C28/32°C

27th Sep 2025695 AMAQI
27th Sep 2025696 AMAQI
27th Sep 2025697 AMAQI
27th Sep 2025698 AMAQI
27th Sep 2025699 AMAQI
27th Sep 20256210 AMAQI
27th Sep 20255611 AMAQI
27th Sep 20255112 PMAQI
27th Sep 2025501 PMAQI
27th Sep 2025572 PMAQI
27th Sep 2025763 PMAQI
27th Sep 2025734 PMAQI
27th Sep 2025775 PMAQI
27th Sep 2025846 PMAQI
27th Sep 2025837 PMAQI
27th Sep 2025808 PMAQI
27th Sep 2025829 PMAQI
27th Sep 20258110 PMAQI
27th Sep 20258811 PMAQI
28th Sep 20258912 AMAQI
28th Sep 2025881 AMAQI
28th Sep 2025892 AMAQI
28th Sep 2025903 AMAQI
28th Sep 2025904 AMAQI

30°C27/34°C

28th Sep 2025905 AMAQI
28th Sep 2025896 AMAQI
28th Sep 2025977 AMAQI
28th Sep 20251098 AMAQI
28th Sep 20251019 AMAQI
28th Sep 20258110 AMAQI
28th Sep 20257411 AMAQI
28th Sep 20257412 PMAQI
28th Sep 2025781 PMAQI
28th Sep 2025652 PMAQI
28th Sep 2025603 PMAQI
28th Sep 2025524 PMAQI
28th Sep 2025545 PMAQI
28th Sep 2025556 PMAQI
28th Sep 2025607 PMAQI
28th Sep 2025638 PMAQI
28th Sep 2025669 PMAQI
28th Sep 20256810 PMAQI
28th Sep 20256411 PMAQI
29th Sep 20256312 AMAQI
29th Sep 2025671 AMAQI
29th Sep 2025702 AMAQI
29th Sep 2025693 AMAQI
29th Sep 2025674 AMAQI

30°C28/33°C

29th Sep 2025595 AMAQI
29th Sep 2025646 AMAQI
29th Sep 2025717 AMAQI
29th Sep 2025708 AMAQI
29th Sep 2025839 AMAQI
29th Sep 20258010 AMAQI
29th Sep 20258611 AMAQI
29th Sep 20258112 PMAQI
29th Sep 2025531 PMAQI
29th Sep 2025392 PMAQI
29th Sep 2025343 PMAQI
29th Sep 2025424 PMAQI
29th Sep 2025415 PMAQI
29th Sep 2025426 PMAQI
29th Sep 2025517 PMAQI
29th Sep 2025498 PMAQI
29th Sep 2025429 PMAQI
29th Sep 20254710 PMAQI
29th Sep 20255711 PMAQI
30th Sep 20255912 AMAQI
30th Sep 2025541 AMAQI
30th Sep 2025582 AMAQI
30th Sep 2025553 AMAQI
30th Sep 2025644 AMAQI

30°C28/33°C

30th Sep 2025625 AMAQI
30th Sep 2025476 AMAQI
30th Sep 2025567 AMAQI
30th Sep 2025678 AMAQI
30th Sep 2025609 AMAQI
30th Sep 20256210 AMAQI
30th Sep 20256411 AMAQI
30th Sep 20255912 PMAQI
30th Sep 2025571 PMAQI
30th Sep 2025542 PMAQI
30th Sep 2025523 PMAQI
30th Sep 2025344 PMAQI
30th Sep 2025345 PMAQI
30th Sep 2025266 PMAQI
30th Sep 2025357 PMAQI
30th Sep 2025348 PMAQI
30th Sep 2025359 PMAQI
30th Sep 20253510 PMAQI
30th Sep 20253611 PMAQI
1st Oct 20254212 AMAQI
1st Oct 2025551 AMAQI
1st Oct 2025562 AMAQI
1st Oct 2025533 AMAQI
1st Oct 2025574 AMAQI

29°C28/32°C

1st Oct 2025565 AMAQI
1st Oct 2025606 AMAQI
1st Oct 2025647 AMAQI
1st Oct 2025728 AMAQI
1st Oct 2025629 AMAQI
1st Oct 20256710 AMAQI
1st Oct 20255811 AMAQI
1st Oct 20254712 PMAQI
1st Oct 2025461 PMAQI
1st Oct 2025462 PMAQI
1st Oct 2025443 PMAQI
1st Oct 2025404 PMAQI
1st Oct 2025385 PMAQI
1st Oct 2025386 PMAQI
1st Oct 2025497 PMAQI
1st Oct 2025598 PMAQI
1st Oct 2025649 PMAQI
1st Oct 20256810 PMAQI
1st Oct 20256911 PMAQI
2nd Oct 20258312 AMAQI
2nd Oct 2025751 AMAQI
2nd Oct 2025742 AMAQI
2nd Oct 2025743 AMAQI
2nd Oct 2025634 AMAQI

29°C27/32°C

2nd Oct 2025705 AMAQI
2nd Oct 2025636 AMAQI
2nd Oct 2025707 AMAQI
2nd Oct 2025798 AMAQI
2nd Oct 2025829 AMAQI
2nd Oct 20257410 AMAQI
2nd Oct 20257011 AMAQI
2nd Oct 20256112 PMAQI
2nd Oct 2025621 PMAQI
2nd Oct 2025602 PMAQI
2nd Oct 2025543 PMAQI
2nd Oct 2025544 PMAQI
2nd Oct 2025485 PMAQI
2nd Oct 2025346 PMAQI
2nd Oct 2025387 PMAQI
2nd Oct 2025538 PMAQI
2nd Oct 2025589 PMAQI
2nd Oct 20255810 PMAQI
2nd Oct 20256211 PMAQI
3rd Oct 20256612 AMAQI
3rd Oct 2025681 AMAQI
3rd Oct 2025702 AMAQI
3rd Oct 2025733 AMAQI
3rd Oct 2025754 AMAQI

29°C27/32°C

3rd Oct 2025745 AMAQI
3rd Oct 2025756 AMAQI
3rd Oct 2025767 AMAQI
3rd Oct 2025718 AMAQI
3rd Oct 2025709 AMAQI
3rd Oct 20257210 AMAQI
3rd Oct 20257011 AMAQI
3rd Oct 20257112 PMAQI
3rd Oct 2025701 PMAQI
3rd Oct 2025672 PMAQI
3rd Oct 2025653 PMAQI
3rd Oct 2025654 PMAQI
3rd Oct 2025585 PMAQI
3rd Oct 2025556 PMAQI
3rd Oct 2025507 PMAQI
3rd Oct 2025658 PMAQI
3rd Oct 2025659 PMAQI
3rd Oct 20256610 PMAQI
3rd Oct 20257011 PMAQI
4th Oct 20256612 AMAQI
4th Oct 2025751 AMAQI
4th Oct 2025782 AMAQI
4th Oct 2025953 AMAQI
4th Oct 2025994 AMAQI

30°C27/33°C

4th Oct 2025875 AMAQI
4th Oct 2025866 AMAQI
4th Oct 2025887 AMAQI
4th Oct 2025928 AMAQI
4th Oct 2025999 AMAQI
4th Oct 20259810 AMAQI
4th Oct 20258911 AMAQI
4th Oct 20257212 PMAQI
4th Oct 2025691 PMAQI
4th Oct 2025742 PMAQI
4th Oct 2025683 PMAQI
4th Oct 2025614 PMAQI
4th Oct 2025635 PMAQI
4th Oct 2025626 PMAQI
4th Oct 2025587 PMAQI
4th Oct 2025608 PMAQI
4th Oct 2025639 PMAQI
4th Oct 20256810 PMAQI
4th Oct 20257311 PMAQI
5th Oct 20257312 AMAQI
5th Oct 2025891 AMAQI
5th Oct 2025822 AMAQI
5th Oct 2025843 AMAQI
5th Oct 2025774 AMAQI

30°C28/33°C

5th Oct 2025805 AMAQI
5th Oct 2025796 AMAQI
5th Oct 2025757 AMAQI
5th Oct 2025798 AMAQI
5th Oct 2025919 AMAQI
5th Oct 20258610 AMAQI
5th Oct 20259511 AMAQI
5th Oct 202510012 PMAQI
5th Oct 2025911 PMAQI
5th Oct 2025522 PMAQI
5th Oct 2025363 PMAQI
5th Oct 2025344 PMAQI
5th Oct 2025565 PMAQI
5th Oct 2025496 PMAQI
5th Oct 2025517 PMAQI
5th Oct 2025568 PMAQI
5th Oct 2025589 PMAQI
5th Oct 20255610 PMAQI
5th Oct 20256111 PMAQI
6th Oct 20256112 AMAQI
6th Oct 2025611 AMAQI
6th Oct 2025582 AMAQI
6th Oct 2025613 AMAQI
6th Oct 2025614 AMAQI

--°C/°C

6th Oct 2025535 AMAQI
5 AM
11 AM
5 PM
11 PM
4 AM

--°C/°C

Day time
Avg. Highest Time
5 AM - 7 AM

57AQI

3 hours / Day
90 hours / Month
Avg. Lowest Time
2 PM - 5 PM

48AQI

4 hours / Day
120 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 AM (Avg. 57), while the lowest AQI was between 2 PM to 5 PM (Avg. 48).
Night time
Avg. Highest Time
1 AM - 4 AM

58AQI

4 hours / Day
120 hours / Month
Avg. Lowest Time
6 PM

47AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 1 AM to 4 AM (Avg. 58), while the lowest AQI was between 6 PM to 6 PM (Avg. 47).

2025 Days Vs Air Quality

Erlin, Huatan, Changhua, Taiwan

2025

47%

130

53%

147

0.3%

1

Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)

Good
130 Days
Moderate
147 Days
Poor
1 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 47%

Health Risk Level:

Significant

In 2025, 47% of 278 days were within WHO’s safe air quality limits, and 53% exceeded them. The risk of health issues is Significant, especially for those with existing respiratory or heart conditions.

Annual Air Quality Insights

Erlin, Huatan, Changhua, 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
84AQI
2nd January 2025
64AQI
3rd January 2025
65AQI
4th January 2025
62AQI
5th January 2025
61AQI
6th January 2025
75AQI
7th January 2025
75AQI
8th January 2025
62AQI
9th January 2025
71AQI
10th January 2025
57AQI
11th January 2025
54AQI
12th January 2025
54AQI
13th January 2025
62AQI
14th January 2025
83AQI
15th January 2025
77AQI
16th January 2025
61AQI
17th January 2025
61AQI
18th January 2025
64AQI
19th January 2025
61AQI
20th January 2025
71AQI
21st January 2025
85AQI
22nd January 2025
96AQI
23rd January 2025
75AQI
24th January 2025
74AQI
25th January 2025
77AQI
26th January 2025
64AQI
27th January 2025
58AQI
28th January 2025
59AQI
29th January 2025
59AQI
30th January 2025
80AQI
31st January 2025
77AQI
1st February 2025
64AQI
2nd February 2025
53AQI
3rd February 2025
52AQI
4th February 2025
73AQI
5th February 2025
66AQI
6th February 2025
80AQI
7th February 2025
58AQI
8th February 2025
63AQI
9th February 2025
48AQI
10th February 2025
55AQI
11th February 2025
65AQI
12th February 2025
64AQI
13th February 2025
52AQI
14th February 2025
59AQI
15th February 2025
56AQI
16th February 2025
78AQI
17th February 2025
95AQI
18th February 2025
67AQI
19th February 2025
71AQI
20th February 2025
68AQI
21st February 2025
49AQI
22nd February 2025
54AQI
23rd February 2025
41AQI
24th February 2025
60AQI
25th February 2025
80AQI
26th February 2025
74AQI
27th February 2025
119AQI
28th February 2025
82AQI
1st March 2025
95AQI
2nd March 2025
80AQI
3rd March 2025
72AQI
4th March 2025
53AQI
5th March 2025
47AQI
6th March 2025
40AQI
7th March 2025
56AQI
8th March 2025
54AQI
9th March 2025
58AQI
10th March 2025
80AQI
11th March 2025
94AQI
12th March 2025
79AQI
13th March 2025
68AQI
14th March 2025
74AQI
15th March 2025
61AQI
16th March 2025
51AQI
17th March 2025
72AQI
18th March 2025
58AQI
19th March 2025
72AQI
20th March 2025
68AQI
21st March 2025
70AQI
22nd March 2025
79AQI
23rd March 2025
81AQI
24th March 2025
72AQI
25th March 2025
67AQI
26th March 2025
65AQI
27th March 2025
61AQI
28th March 2025
68AQI
29th March 2025
44AQI
30th March 2025
39AQI
31st March 2025
34AQI
1st April 2025
32AQI
2nd April 2025
52AQI
3rd April 2025
68AQI
4th April 2025
83AQI
5th April 2025
70AQI
6th April 2025
64AQI
7th April 2025
77AQI
8th April 2025
78AQI
9th April 2025
68AQI
10th April 2025
69AQI
11th April 2025
72AQI
12th April 2025
55AQI
13th April 2025
83AQI
14th April 2025
74AQI
15th April 2025
83AQI
16th April 2025
79AQI
17th April 2025
76AQI
18th April 2025
66AQI
19th April 2025
62AQI
20th April 2025
61AQI
21st April 2025
62AQI
22nd April 2025
56AQI
23rd April 2025
60AQI
24th April 2025
61AQI
25th April 2025
50AQI
26th April 2025
62AQI
27th April 2025
60AQI
28th April 2025
60AQI
29th April 2025
69AQI
30th April 2025
69AQI
1st May 2025
64AQI
2nd May 2025
74AQI
3rd May 2025
68AQI
4th May 2025
74AQI
5th May 2025
68AQI
6th May 2025
65AQI
7th May 2025
52AQI
8th May 2025
62AQI
9th May 2025
46AQI
10th May 2025
36AQI
11th May 2025
37AQI
12th May 2025
52AQI
13th May 2025
58AQI
14th May 2025
57AQI
15th May 2025
45AQI
16th May 2025
54AQI
17th May 2025
45AQI
18th May 2025
39AQI
19th May 2025
37AQI
20th May 2025
34AQI
21st May 2025
32AQI
22nd May 2025
44AQI
23rd May 2025
40AQI
24th May 2025
41AQI
25th May 2025
52AQI
26th May 2025
49AQI
27th May 2025
50AQI
28th May 2025
57AQI
29th May 2025
37AQI
30th May 2025
52AQI
31st May 2025
58AQI
1st June 2025
53AQI
2nd June 2025
37AQI
3rd June 2025
33AQI
4th June 2025
42AQI
5th June 2025
34AQI
6th June 2025
42AQI
7th June 2025
31AQI
8th June 2025
33AQI
9th June 2025
30AQI
10th June 2025
32AQI
11th June 2025
45AQI
12th June 2025
51AQI
13th June 2025
33AQI
14th June 2025
31AQI
15th June 2025
35AQI
16th June 2025
32AQI
17th June 2025
31AQI
18th June 2025
35AQI
19th June 2025
33AQI
20th June 2025
35AQI
21st June 2025
30AQI
22nd June 2025
22AQI
23rd June 2025
23AQI
24th June 2025
26AQI
25th June 2025
28AQI
26th June 2025
26AQI
27th June 2025
25AQI
28th June 2025
29AQI
29th June 2025
32AQI
30th June 2025
35AQI
1st July 2025
38AQI
2nd July 2025
43AQI
3rd July 2025
46AQI
4th July 2025
49AQI
5th July 2025
39AQI
6th July 2025
39AQI
7th July 2025
35AQI
8th July 2025
39AQI
9th July 2025
38AQI
10th July 2025
35AQI
11th July 2025
37AQI
12th July 2025
41AQI
13th July 2025
44AQI
14th July 2025
47AQI
15th July 2025
43AQI
16th July 2025
43AQI
17th July 2025
46AQI
18th July 2025
46AQI
19th July 2025
50AQI
20th July 2025
41AQI
21st July 2025
40AQI
22nd July 2025
41AQI
23rd July 2025
57AQI
24th July 2025
54AQI
25th July 2025
41AQI
26th July 2025
40AQI
27th July 2025
42AQI
28th July 2025
32AQI
29th July 2025
34AQI
30th July 2025
43AQI
31st July 2025
38AQI
1st August 2025
43AQI
2nd August 2025
42AQI
3rd August 2025
42AQI
4th August 2025
39AQI
5th August 2025
47AQI
6th August 2025
48AQI
7th August 2025
48AQI
8th August 2025
51AQI
9th August 2025
44AQI
10th August 2025
37AQI
11th August 2025
38AQI
12th August 2025
45AQI
13th August 2025
43AQI
14th August 2025
36AQI
15th August 2025
38AQI
16th August 2025
40AQI
17th August 2025
37AQI
18th August 2025
38AQI
19th August 2025
38AQI
20th August 2025
37AQI
21st August 2025
39AQI
22nd August 2025
44AQI
23rd August 2025
47AQI
24th August 2025
47AQI
25th August 2025
47AQI
26th August 2025
42AQI
27th August 2025
41AQI
28th August 2025
43AQI
29th August 2025
42AQI
30th August 2025
40AQI
31st August 2025
43AQI
1st September 2025
48AQI
2nd September 2025
46AQI
3rd September 2025
50AQI
4th September 2025
58AQI
5th September 2025
61AQI
6th September 2025
52AQI
7th September 2025
45AQI
8th September 2025
40AQI
9th September 2025
39AQI
10th September 2025
42AQI
11th September 2025
41AQI
12th September 2025
44AQI
13th September 2025
44AQI
14th September 2025
45AQI
15th September 2025
48AQI
16th September 2025
50AQI
17th September 2025
53AQI
18th September 2025
55AQI
19th September 2025
48AQI
20th September 2025
40AQI
21st September 2025
48AQI
22nd September 2025
52AQI
23rd September 2025
45AQI
24th September 2025
47AQI
25th September 2025
52AQI
26th September 2025
78AQI
27th September 2025
71AQI
28th September 2025
78AQI
29th September 2025
59AQI
30th September 2025
51AQI
1st October 2025
52AQI
2nd October 2025
65AQI
3rd October 2025
66AQI
4th October 2025
74AQI
5th October 2025
76AQI
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

69AQI

66AQI

65AQI

66AQI

51AQI

33AQI

42AQI

42AQI

51AQI

67AQI

No. of days

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

202554AQI

31
3
24
1
5
26
2
28
15
16
28
2
29
2
30
1
18
12
5
130
147
1

Highest AQI recorded in

January

69AQI

Lowest AQI recorded in

June

33AQI

202461AQI

2
19
10
2
21
6
2
20
9
1
26
3
3
28
29
31
23
8
14
16
14
17
18
12
8
23
147
190
28

Highest AQI recorded in

March

87AQI

Lowest AQI recorded in

July

31AQI

202362AQI

5
21
5
2
21
5
4
20
7
25
5
7
22
2
21
9
26
5
30
1
12
18
11
18
2
4
24
1
10
17
4
132
201
31

Highest AQI recorded in

April

84AQI

Lowest AQI recorded in

July

36AQI

202258AQI

7
23
10
10
1
4
16
11
6
12
13
18
25
5
18
3
1
7
21
16
13
2
10
18
2
21
10
138
149
16

Highest AQI recorded in

March

91AQI

Lowest AQI recorded in

July

36AQI

202163AQI

4
19
6
1
14
12
1
1
18
12
1
29
21
10
29
1
24
7
26
5
10
18
2
10
18
3
7
22
1
8
22
1
142
183
37
1

Highest AQI recorded in

February

99AQI

Lowest AQI recorded in

June

32AQI

202053AQI

2
8
3
2
16
3
14
4
27
3
27
4
28
3
9
19
2
1
30
5
22
3
15
13
3
130
122
14

Highest AQI recorded in

March

78AQI

Lowest AQI recorded in

July

35AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2021(Avg.)
63AQI
Least Polluted Year Recorded
2020(Avg.)
53AQI

Erlin's annual 2025 AQI (54) shows an average percentage change of -8.6% (improved AQI) compared to previous years: 2020 (53), 2021 (63), 2022 (58), 2023 (62), 2024 (61).