Country Background
HistoryAQIPM2.5PM10COSO2NO2O3

Cheonan, Chonan, Chungnam, South Korea 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

Cheonan, Chonan, Chungnam, South Korea

2021
2022
2023
2024
2025
AQI
.
Days

AQI Trends: Highest and Lowest

Highest AQI recorded on
12th Aug 2021
92AQI
Lowest AQI recorded on
31st Aug 2022
22AQI

Same Day Analysis (2nd August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 62 of Moderate air quality, showing improvement over 2023 on the same day.

Download 2024 Annual Data

World Air Quality Report

Globe

Day & Night AQI Trend: 2nd Aug - 3rd Aug 2025

Cheonan, Chonan, Chungnam, South Korea

AQI
Day
Night
.

5 AM2nd Aug 2025

7 PM

4 AM3rd Aug 2025

Day time
Avg. Highest Time
12PM2nd Aug

80AQI

Avg. Lowest Time
6AM2nd Aug

55AQI

Night time
Avg. Highest Time
11PM2nd Aug

62AQI

Avg. Lowest Time
3AM3rd Aug

55AQI

In the last 24 hours,

Cheonan's AQI reached its highest point of 80 at 12 PM during the Day, while the lowest point, 55, was recorded at 3 AM during the Night between 2nd Aug and 3rd Aug 2025.

Day & Night AQI Trend : Jul - Aug 2025

Cheonan, Chonan, Chungnam, South Korea

JulAug
04th - 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 - 01st01st - 02nd02nd - 03rd03rd
Day
Night
4th Jul 2025525 AMAQI
4th Jul 2025536 AMAQI
4th Jul 2025537 AMAQI
4th Jul 2025538 AMAQI
4th Jul 2025529 AMAQI
4th Jul 20255310 AMAQI
4th Jul 20255511 AMAQI
4th Jul 20255312 PMAQI
4th Jul 2025491 PMAQI
4th Jul 2025522 PMAQI
4th Jul 2025533 PMAQI
4th Jul 2025424 PMAQI
4th Jul 2025415 PMAQI
4th Jul 2025446 PMAQI
4th Jul 2025437 PMAQI
4th Jul 2025408 PMAQI
4th Jul 2025509 PMAQI
4th Jul 20255010 PMAQI
4th Jul 20255011 PMAQI
5th Jul 20255012 AMAQI
5th Jul 2025511 AMAQI
5th Jul 2025522 AMAQI
5th Jul 2025523 AMAQI
5th Jul 2025514 AMAQI

25°C21/31°C

5th Jul 2025525 AMAQI
5th Jul 2025526 AMAQI
5th Jul 2025527 AMAQI
5th Jul 2025528 AMAQI
5th Jul 2025489 AMAQI
5th Jul 20254310 AMAQI
5th Jul 20253811 AMAQI
5th Jul 20253212 PMAQI
5th Jul 2025381 PMAQI
5th Jul 2025432 PMAQI
5th Jul 2025483 PMAQI
5th Jul 2025484 PMAQI
5th Jul 2025485 PMAQI
5th Jul 2025506 PMAQI
5th Jul 2025507 PMAQI
5th Jul 2025468 PMAQI
5th Jul 2025529 PMAQI
5th Jul 20255110 PMAQI
5th Jul 20255011 PMAQI
6th Jul 20255212 AMAQI
6th Jul 2025511 AMAQI
6th Jul 2025512 AMAQI
6th Jul 2025503 AMAQI
6th Jul 2025494 AMAQI

26°C21/33°C

6th Jul 2025505 AMAQI
6th Jul 2025506 AMAQI
6th Jul 2025507 AMAQI
6th Jul 2025518 AMAQI
6th Jul 2025499 AMAQI
6th Jul 20254810 AMAQI
6th Jul 20254911 AMAQI
6th Jul 20254612 PMAQI
6th Jul 2025501 PMAQI
6th Jul 2025542 PMAQI
6th Jul 2025533 PMAQI
6th Jul 2025524 PMAQI
6th Jul 2025495 PMAQI
6th Jul 2025536 PMAQI
6th Jul 2025527 PMAQI
6th Jul 2025468 PMAQI
6th Jul 2025529 PMAQI
6th Jul 20255210 PMAQI
6th Jul 20255211 PMAQI
7th Jul 20255212 AMAQI
7th Jul 2025511 AMAQI
7th Jul 2025502 AMAQI
7th Jul 2025513 AMAQI
7th Jul 2025524 AMAQI

27°C21/34°C

7th Jul 2025525 AMAQI
7th Jul 2025526 AMAQI
7th Jul 2025527 AMAQI
7th Jul 2025528 AMAQI
7th Jul 2025489 AMAQI
7th Jul 20255610 AMAQI
7th Jul 20255411 AMAQI
7th Jul 20255312 PMAQI
7th Jul 2025561 PMAQI
7th Jul 2025582 PMAQI
7th Jul 2025613 PMAQI
7th Jul 2025644 PMAQI
7th Jul 2025695 PMAQI
7th Jul 2025716 PMAQI
7th Jul 2025717 PMAQI
7th Jul 2025678 PMAQI
7th Jul 2025549 PMAQI
7th Jul 20255410 PMAQI
7th Jul 20255411 PMAQI
8th Jul 20255412 AMAQI
8th Jul 2025541 AMAQI
8th Jul 2025532 AMAQI
8th Jul 2025513 AMAQI
8th Jul 2025524 AMAQI

28°C23/34°C

8th Jul 2025525 AMAQI
8th Jul 2025526 AMAQI
8th Jul 2025527 AMAQI
8th Jul 2025528 AMAQI
8th Jul 2025669 AMAQI
8th Jul 20257910 AMAQI
8th Jul 20257311 AMAQI
8th Jul 20257012 PMAQI
8th Jul 2025621 PMAQI
8th Jul 2025622 PMAQI
8th Jul 2025613 PMAQI
8th Jul 2025624 PMAQI
8th Jul 2025615 PMAQI
8th Jul 2025636 PMAQI
8th Jul 2025627 PMAQI
8th Jul 2025628 PMAQI
8th Jul 2025549 PMAQI
8th Jul 20255410 PMAQI
8th Jul 20255411 PMAQI
9th Jul 20255412 AMAQI
9th Jul 2025541 AMAQI
9th Jul 2025532 AMAQI
9th Jul 2025533 AMAQI
9th Jul 2025544 AMAQI

29°C23/36°C

9th Jul 2025545 AMAQI
9th Jul 2025546 AMAQI
9th Jul 2025547 AMAQI
9th Jul 2025548 AMAQI
9th Jul 2025449 AMAQI
9th Jul 20254410 AMAQI
9th Jul 20254511 AMAQI
9th Jul 20254012 PMAQI
9th Jul 2025481 PMAQI
9th Jul 2025452 PMAQI
9th Jul 2025483 PMAQI
9th Jul 2025464 PMAQI
9th Jul 2025465 PMAQI
9th Jul 2025486 PMAQI
9th Jul 2025507 PMAQI
9th Jul 2025468 PMAQI
9th Jul 2025539 PMAQI
9th Jul 20255310 PMAQI
9th Jul 20255411 PMAQI
10th Jul 20255412 AMAQI
10th Jul 2025541 AMAQI
10th Jul 2025542 AMAQI
10th Jul 2025543 AMAQI
10th Jul 2025544 AMAQI

29°C24/35°C

10th Jul 2025545 AMAQI
10th Jul 2025546 AMAQI
10th Jul 2025547 AMAQI
10th Jul 2025548 AMAQI
10th Jul 2025379 AMAQI
10th Jul 20252610 AMAQI
10th Jul 20253011 AMAQI
10th Jul 20253712 PMAQI
10th Jul 2025461 PMAQI
10th Jul 2025482 PMAQI
10th Jul 2025483 PMAQI
10th Jul 2025464 PMAQI
10th Jul 2025495 PMAQI
10th Jul 2025486 PMAQI
10th Jul 2025477 PMAQI
10th Jul 2025488 PMAQI
10th Jul 2025569 PMAQI
10th Jul 20255810 PMAQI
10th Jul 20255811 PMAQI
11th Jul 20255612 AMAQI
11th Jul 2025591 AMAQI
11th Jul 2025592 AMAQI
11th Jul 2025583 AMAQI
11th Jul 2025594 AMAQI

27°C22/34°C

11th Jul 2025585 AMAQI
11th Jul 2025586 AMAQI
11th Jul 2025547 AMAQI
11th Jul 2025548 AMAQI
11th Jul 2025419 AMAQI
11th Jul 20253810 AMAQI
11th Jul 20254011 AMAQI
11th Jul 20254412 PMAQI
11th Jul 2025481 PMAQI
11th Jul 2025432 PMAQI
11th Jul 2025463 PMAQI
11th Jul 2025524 PMAQI
11th Jul 2025525 PMAQI
11th Jul 2025526 PMAQI
11th Jul 2025527 PMAQI
11th Jul 2025538 PMAQI
11th Jul 2025559 PMAQI
11th Jul 20255510 PMAQI
11th Jul 20255511 PMAQI
12th Jul 20255512 AMAQI
12th Jul 2025551 AMAQI
12th Jul 2025572 AMAQI
12th Jul 2025573 AMAQI
12th Jul 2025574 AMAQI

26°C20/33°C

12th Jul 2025565 AMAQI
12th Jul 2025566 AMAQI
12th Jul 2025567 AMAQI
12th Jul 2025568 AMAQI
12th Jul 2025429 AMAQI
12th Jul 20253910 AMAQI
12th Jul 20253811 AMAQI
12th Jul 20254112 PMAQI
12th Jul 2025481 PMAQI
12th Jul 2025542 PMAQI
12th Jul 2025543 PMAQI
12th Jul 2025544 PMAQI
12th Jul 2025545 PMAQI
12th Jul 2025546 PMAQI
12th Jul 2025517 PMAQI
12th Jul 2025538 PMAQI
12th Jul 2025559 PMAQI
12th Jul 20255510 PMAQI
12th Jul 20255511 PMAQI
13th Jul 20255612 AMAQI
13th Jul 2025561 AMAQI
13th Jul 2025562 AMAQI
13th Jul 2025563 AMAQI
13th Jul 2025564 AMAQI

26°C19/33°C

13th Jul 2025555 AMAQI
13th Jul 2025566 AMAQI
13th Jul 2025557 AMAQI
13th Jul 2025568 AMAQI
13th Jul 2025659 AMAQI
13th Jul 20257710 AMAQI
13th Jul 20257211 AMAQI
13th Jul 20256912 PMAQI
13th Jul 2025611 PMAQI
13th Jul 2025632 PMAQI
13th Jul 2025673 PMAQI
13th Jul 2025654 PMAQI
13th Jul 2025645 PMAQI
13th Jul 2025646 PMAQI
13th Jul 2025677 PMAQI
13th Jul 2025658 PMAQI
13th Jul 2025589 PMAQI
13th Jul 20255810 PMAQI
13th Jul 20255711 PMAQI
14th Jul 20255612 AMAQI
14th Jul 2025551 AMAQI
14th Jul 2025562 AMAQI
14th Jul 2025563 AMAQI
14th Jul 2025564 AMAQI

24°C19/28°C

14th Jul 2025565 AMAQI
14th Jul 2025566 AMAQI
14th Jul 2025567 AMAQI
14th Jul 2025578 AMAQI
14th Jul 2025599 AMAQI
14th Jul 20256010 AMAQI
14th Jul 20256711 AMAQI
14th Jul 20257412 PMAQI
14th Jul 2025691 PMAQI
14th Jul 2025742 PMAQI
14th Jul 2025713 PMAQI
14th Jul 2025654 PMAQI
14th Jul 2025585 PMAQI
14th Jul 2025556 PMAQI
14th Jul 2025497 PMAQI
14th Jul 2025468 PMAQI
14th Jul 2025559 PMAQI
14th Jul 20255510 PMAQI
14th Jul 20255511 PMAQI
15th Jul 20255512 AMAQI
15th Jul 2025561 AMAQI
15th Jul 2025562 AMAQI
15th Jul 2025563 AMAQI
15th Jul 2025564 AMAQI

23°C20/28°C

15th Jul 2025575 AMAQI
15th Jul 2025576 AMAQI
15th Jul 2025577 AMAQI
15th Jul 2025578 AMAQI
15th Jul 2025299 AMAQI
15th Jul 20251410 AMAQI
15th Jul 20251711 AMAQI
15th Jul 20252012 PMAQI
15th Jul 2025361 PMAQI
15th Jul 2025352 PMAQI
15th Jul 2025373 PMAQI
15th Jul 2025384 PMAQI
15th Jul 2025435 PMAQI
15th Jul 2025456 PMAQI
15th Jul 2025467 PMAQI
15th Jul 2025508 PMAQI
15th Jul 2025539 PMAQI
15th Jul 20255210 PMAQI
15th Jul 20255411 PMAQI
16th Jul 20255412 AMAQI
16th Jul 2025551 AMAQI
16th Jul 2025562 AMAQI
16th Jul 2025553 AMAQI
16th Jul 2025554 AMAQI

21°C19/25°C

16th Jul 2025555 AMAQI
16th Jul 2025546 AMAQI
16th Jul 2025547 AMAQI
16th Jul 2025558 AMAQI
16th Jul 2025619 AMAQI
16th Jul 20255610 AMAQI
16th Jul 20255711 AMAQI
16th Jul 20255612 PMAQI
16th Jul 2025601 PMAQI
16th Jul 2025532 PMAQI
16th Jul 2025513 PMAQI
16th Jul 2025444 PMAQI
16th Jul 2025505 PMAQI
16th Jul 2025456 PMAQI
16th Jul 2025387 PMAQI
16th Jul 2025418 PMAQI
16th Jul 2025539 PMAQI
16th Jul 20255310 PMAQI
16th Jul 20255311 PMAQI
17th Jul 20255312 AMAQI
17th Jul 2025541 AMAQI
17th Jul 2025542 AMAQI
17th Jul 2025543 AMAQI
17th Jul 2025544 AMAQI

21°C19/25°C

17th Jul 2025545 AMAQI
17th Jul 2025556 AMAQI
17th Jul 2025557 AMAQI
17th Jul 2025558 AMAQI
17th Jul 2025269 AMAQI
17th Jul 20251610 AMAQI
17th Jul 20251511 AMAQI
17th Jul 20251612 PMAQI
17th Jul 2025261 PMAQI
17th Jul 2025252 PMAQI
17th Jul 2025223 PMAQI
17th Jul 2025234 PMAQI
17th Jul 2025255 PMAQI
17th Jul 2025246 PMAQI
17th Jul 2025257 PMAQI
17th Jul 2025318 PMAQI
17th Jul 2025429 PMAQI
17th Jul 20254210 PMAQI
17th Jul 20254311 PMAQI
18th Jul 20254412 AMAQI
18th Jul 2025471 AMAQI
18th Jul 2025542 AMAQI
18th Jul 2025543 AMAQI
18th Jul 2025534 AMAQI

23°C20/26°C

18th Jul 2025525 AMAQI
18th Jul 2025526 AMAQI
18th Jul 2025527 AMAQI
18th Jul 2025518 AMAQI
18th Jul 2025319 AMAQI
18th Jul 20252610 AMAQI
18th Jul 20252911 AMAQI
18th Jul 20253212 PMAQI
18th Jul 2025381 PMAQI
18th Jul 2025362 PMAQI
18th Jul 2025373 PMAQI
18th Jul 2025384 PMAQI
18th Jul 2025405 PMAQI
18th Jul 2025446 PMAQI
18th Jul 2025467 PMAQI
18th Jul 2025428 PMAQI
18th Jul 2025469 PMAQI
18th Jul 20254610 PMAQI
18th Jul 20254811 PMAQI
19th Jul 20254912 AMAQI
19th Jul 2025501 AMAQI
19th Jul 2025502 AMAQI
19th Jul 2025503 AMAQI
19th Jul 2025504 AMAQI

23°C21/27°C

19th Jul 2025475 AMAQI
19th Jul 2025486 AMAQI
19th Jul 2025477 AMAQI
19th Jul 2025488 AMAQI
19th Jul 2025229 AMAQI
19th Jul 20251310 AMAQI
19th Jul 20251311 AMAQI
19th Jul 20251412 PMAQI
19th Jul 2025181 PMAQI
19th Jul 2025192 PMAQI
19th Jul 2025193 PMAQI
19th Jul 2025214 PMAQI
19th Jul 2025215 PMAQI
19th Jul 2025216 PMAQI
19th Jul 2025217 PMAQI
19th Jul 2025248 PMAQI
19th Jul 2025369 PMAQI
19th Jul 20253610 PMAQI
19th Jul 20253411 PMAQI
20th Jul 20253512 AMAQI
20th Jul 2025431 AMAQI
20th Jul 2025482 AMAQI
20th Jul 2025483 AMAQI
20th Jul 2025464 AMAQI

25°C21/28°C

20th Jul 2025435 AMAQI
20th Jul 2025436 AMAQI
20th Jul 2025437 AMAQI
20th Jul 2025438 AMAQI
20th Jul 2025309 AMAQI
20th Jul 20252210 AMAQI
20th Jul 20252711 AMAQI
20th Jul 20253612 PMAQI
20th Jul 2025381 PMAQI
20th Jul 2025382 PMAQI
20th Jul 2025383 PMAQI
20th Jul 2025394 PMAQI
20th Jul 2025475 PMAQI
20th Jul 2025486 PMAQI
20th Jul 2025507 PMAQI
20th Jul 2025488 PMAQI
20th Jul 2025459 PMAQI
20th Jul 20254610 PMAQI
20th Jul 20254811 PMAQI
21st Jul 20254812 AMAQI
21st Jul 2025441 AMAQI
21st Jul 2025442 AMAQI
21st Jul 2025433 AMAQI
21st Jul 2025434 AMAQI

26°C22/32°C

21st Jul 2025425 AMAQI
21st Jul 2025426 AMAQI
21st Jul 2025427 AMAQI
21st Jul 2025428 AMAQI
21st Jul 2025489 AMAQI
21st Jul 20255410 AMAQI
21st Jul 20255211 AMAQI
21st Jul 20255312 PMAQI
21st Jul 2025491 PMAQI
21st Jul 2025422 PMAQI
21st Jul 2025373 PMAQI
21st Jul 2025384 PMAQI
21st Jul 2025335 PMAQI
21st Jul 2025346 PMAQI
21st Jul 2025347 PMAQI
21st Jul 2025308 PMAQI
21st Jul 2025349 PMAQI
21st Jul 20253410 PMAQI
21st Jul 20253411 PMAQI
22nd Jul 20253412 AMAQI
22nd Jul 2025431 AMAQI
22nd Jul 2025432 AMAQI
22nd Jul 2025433 AMAQI
22nd Jul 2025444 AMAQI

27°C23/31°C

22nd Jul 2025455 AMAQI
22nd Jul 2025466 AMAQI
22nd Jul 2025447 AMAQI
22nd Jul 2025448 AMAQI
22nd Jul 2025329 AMAQI
22nd Jul 20253110 AMAQI
22nd Jul 20253611 AMAQI
22nd Jul 20253412 PMAQI
22nd Jul 2025371 PMAQI
22nd Jul 2025392 PMAQI
22nd Jul 2025333 PMAQI
22nd Jul 2025344 PMAQI
22nd Jul 2025405 PMAQI
22nd Jul 2025356 PMAQI
22nd Jul 2025347 PMAQI
22nd Jul 2025358 PMAQI
22nd Jul 2025399 PMAQI
22nd Jul 20253810 PMAQI
22nd Jul 20253911 PMAQI
23rd Jul 20254112 AMAQI
23rd Jul 2025401 AMAQI
23rd Jul 2025422 AMAQI
23rd Jul 2025433 AMAQI
23rd Jul 2025424 AMAQI

26°C23/30°C

23rd Jul 2025405 AMAQI
23rd Jul 2025406 AMAQI
23rd Jul 2025417 AMAQI
23rd Jul 2025408 AMAQI
23rd Jul 2025469 AMAQI
23rd Jul 20255210 AMAQI
23rd Jul 20255411 AMAQI
23rd Jul 20255612 PMAQI
23rd Jul 2025531 PMAQI
23rd Jul 2025532 PMAQI
23rd Jul 2025523 PMAQI
23rd Jul 2025534 PMAQI
23rd Jul 2025535 PMAQI
23rd Jul 2025546 PMAQI
23rd Jul 2025547 PMAQI
23rd Jul 2025538 PMAQI
23rd Jul 2025529 PMAQI
23rd Jul 20255110 PMAQI
23rd Jul 20255111 PMAQI
24th Jul 20255112 AMAQI
24th Jul 2025421 AMAQI
24th Jul 2025422 AMAQI
24th Jul 2025423 AMAQI
24th Jul 2025434 AMAQI

26°C23/31°C

24th Jul 2025445 AMAQI
24th Jul 2025436 AMAQI
24th Jul 2025437 AMAQI
24th Jul 2025438 AMAQI
24th Jul 2025519 AMAQI
24th Jul 20255410 AMAQI
24th Jul 20255711 AMAQI
24th Jul 20256212 PMAQI
24th Jul 2025601 PMAQI
24th Jul 2025622 PMAQI
24th Jul 2025603 PMAQI
24th Jul 2025614 PMAQI
24th Jul 2025615 PMAQI
24th Jul 2025636 PMAQI
24th Jul 2025627 PMAQI
24th Jul 2025628 PMAQI
24th Jul 2025569 PMAQI
24th Jul 20255910 PMAQI
24th Jul 20255911 PMAQI
25th Jul 20255912 AMAQI
25th Jul 2025601 AMAQI
25th Jul 2025522 AMAQI
25th Jul 2025463 AMAQI
25th Jul 2025484 AMAQI

27°C23/33°C

25th Jul 2025515 AMAQI
25th Jul 2025516 AMAQI
25th Jul 2025507 AMAQI
25th Jul 2025518 AMAQI
25th Jul 2025689 AMAQI
25th Jul 20257410 AMAQI
25th Jul 20257211 AMAQI
25th Jul 20256412 PMAQI
25th Jul 2025541 PMAQI
25th Jul 2025532 PMAQI
25th Jul 2025563 PMAQI
25th Jul 2025524 PMAQI
25th Jul 2025525 PMAQI
25th Jul 2025506 PMAQI
25th Jul 2025527 PMAQI
25th Jul 2025568 PMAQI
25th Jul 2025569 PMAQI
25th Jul 20255810 PMAQI
25th Jul 20256111 PMAQI
26th Jul 20256012 AMAQI
26th Jul 2025531 AMAQI
26th Jul 2025522 AMAQI
26th Jul 2025533 AMAQI
26th Jul 2025534 AMAQI

28°C23/35°C

26th Jul 2025545 AMAQI
26th Jul 2025546 AMAQI
26th Jul 2025547 AMAQI
26th Jul 2025548 AMAQI
26th Jul 2025519 AMAQI
26th Jul 20253810 AMAQI
26th Jul 20253311 AMAQI
26th Jul 20253012 PMAQI
26th Jul 2025331 PMAQI
26th Jul 2025322 PMAQI
26th Jul 2025333 PMAQI
26th Jul 2025314 PMAQI
26th Jul 2025285 PMAQI
26th Jul 2025246 PMAQI
26th Jul 2025277 PMAQI
26th Jul 2025388 PMAQI
26th Jul 2025519 PMAQI
26th Jul 20255110 PMAQI
26th Jul 20255211 PMAQI
27th Jul 20255212 AMAQI
27th Jul 2025531 AMAQI
27th Jul 2025542 AMAQI
27th Jul 2025543 AMAQI
27th Jul 2025534 AMAQI

29°C24/35°C

27th Jul 2025525 AMAQI
27th Jul 2025526 AMAQI
27th Jul 2025527 AMAQI
27th Jul 2025528 AMAQI
27th Jul 2025459 AMAQI
27th Jul 20252810 AMAQI
27th Jul 20252211 AMAQI
27th Jul 20252112 PMAQI
27th Jul 2025231 PMAQI
27th Jul 2025222 PMAQI
27th Jul 2025223 PMAQI
27th Jul 2025204 PMAQI
27th Jul 2025225 PMAQI
27th Jul 2025256 PMAQI
27th Jul 2025327 PMAQI
27th Jul 2025368 PMAQI
27th Jul 2025529 PMAQI
27th Jul 20255410 PMAQI
27th Jul 20255411 PMAQI
28th Jul 20255612 AMAQI
28th Jul 2025531 AMAQI
28th Jul 2025532 AMAQI
28th Jul 2025533 AMAQI
28th Jul 2025524 AMAQI

29°C24/35°C

28th Jul 2025495 AMAQI
28th Jul 2025486 AMAQI
28th Jul 2025497 AMAQI
28th Jul 2025498 AMAQI
28th Jul 2025609 AMAQI
28th Jul 20257010 AMAQI
28th Jul 20257011 AMAQI
28th Jul 20256612 PMAQI
28th Jul 2025641 PMAQI
28th Jul 2025652 PMAQI
28th Jul 2025603 PMAQI
28th Jul 2025534 PMAQI
28th Jul 2025625 PMAQI
28th Jul 2025676 PMAQI
28th Jul 2025647 PMAQI
28th Jul 2025588 PMAQI
28th Jul 2025549 PMAQI
28th Jul 20255810 PMAQI
28th Jul 20255811 PMAQI
29th Jul 20255812 AMAQI
29th Jul 2025541 AMAQI
29th Jul 2025522 AMAQI
29th Jul 2025523 AMAQI
29th Jul 2025534 AMAQI

28°C24/33°C

29th Jul 2025555 AMAQI
29th Jul 2025556 AMAQI
29th Jul 2025557 AMAQI
29th Jul 2025558 AMAQI
29th Jul 2025669 AMAQI
29th Jul 20257310 AMAQI
29th Jul 20257411 AMAQI
29th Jul 20257212 PMAQI
29th Jul 2025701 PMAQI
29th Jul 2025682 PMAQI
29th Jul 2025623 PMAQI
29th Jul 2025504 PMAQI
29th Jul 2025535 PMAQI
29th Jul 2025576 PMAQI
29th Jul 2025787 PMAQI
29th Jul 2025808 PMAQI
29th Jul 2025669 PMAQI
29th Jul 20256510 PMAQI
29th Jul 20256511 PMAQI
30th Jul 20256212 AMAQI
30th Jul 2025551 AMAQI
30th Jul 2025542 AMAQI
30th Jul 2025543 AMAQI
30th Jul 2025564 AMAQI

28°C23/35°C

30th Jul 2025585 AMAQI
30th Jul 2025586 AMAQI
30th Jul 2025587 AMAQI
30th Jul 2025578 AMAQI
30th Jul 2025749 AMAQI
30th Jul 20257610 AMAQI
30th Jul 20257211 AMAQI
30th Jul 20256612 PMAQI
30th Jul 2025601 PMAQI
30th Jul 2025552 PMAQI
30th Jul 2025453 PMAQI
30th Jul 2025384 PMAQI
30th Jul 2025345 PMAQI
30th Jul 2025356 PMAQI
30th Jul 2025377 PMAQI
30th Jul 2025408 PMAQI
30th Jul 2025529 PMAQI
30th Jul 20254810 PMAQI
30th Jul 20255011 PMAQI
31st Jul 20255512 AMAQI
31st Jul 2025571 AMAQI
31st Jul 2025572 AMAQI
31st Jul 2025573 AMAQI
31st Jul 2025574 AMAQI

28°C23/34°C

31st Jul 2025575 AMAQI
31st Jul 2025576 AMAQI
31st Jul 2025577 AMAQI
31st Jul 2025578 AMAQI
31st Jul 2025579 AMAQI
31st Jul 20255710 AMAQI
31st Jul 20254711 AMAQI
31st Jul 20254512 PMAQI
31st Jul 2025511 PMAQI
31st Jul 2025542 PMAQI
31st Jul 2025583 PMAQI
31st Jul 2025594 PMAQI
31st Jul 2025585 PMAQI
31st Jul 2025576 PMAQI
31st Jul 2025587 PMAQI
31st Jul 2025578 PMAQI
31st Jul 2025539 PMAQI
31st Jul 20255410 PMAQI
31st Jul 20255411 PMAQI
1st Aug 20255612 AMAQI
1st Aug 2025541 AMAQI
1st Aug 2025542 AMAQI
1st Aug 2025543 AMAQI
1st Aug 2025554 AMAQI

27°C24/33°C

1st Aug 2025565 AMAQI
1st Aug 2025566 AMAQI
1st Aug 2025567 AMAQI
1st Aug 2025558 AMAQI
1st Aug 2025509 AMAQI
1st Aug 20255710 AMAQI
1st Aug 20255711 AMAQI
1st Aug 20255812 PMAQI
1st Aug 2025581 PMAQI
1st Aug 2025602 PMAQI
1st Aug 2025603 PMAQI
1st Aug 2025634 PMAQI
1st Aug 2025635 PMAQI
1st Aug 2025616 PMAQI
1st Aug 2025587 PMAQI
1st Aug 2025578 PMAQI
1st Aug 2025629 PMAQI
1st Aug 20256210 PMAQI
1st Aug 20255911 PMAQI
2nd Aug 20256012 AMAQI
2nd Aug 2025541 AMAQI
2nd Aug 2025552 AMAQI
2nd Aug 2025553 AMAQI
2nd Aug 2025564 AMAQI

28°C24/34°C

2nd Aug 2025555 AMAQI
2nd Aug 2025556 AMAQI
2nd Aug 2025567 AMAQI
2nd Aug 2025568 AMAQI
2nd Aug 2025769 AMAQI
2nd Aug 20257810 AMAQI
2nd Aug 20257211 AMAQI
2nd Aug 20258012 PMAQI
2nd Aug 2025781 PMAQI
2nd Aug 2025652 PMAQI
2nd Aug 2025643 PMAQI
2nd Aug 2025664 PMAQI
2nd Aug 2025645 PMAQI
2nd Aug 2025666 PMAQI
2nd Aug 2025627 PMAQI
2nd Aug 2025608 PMAQI
2nd Aug 2025609 PMAQI
2nd Aug 20255910 PMAQI
2nd Aug 20256211 PMAQI
3rd Aug 20255612 AMAQI
3rd Aug 2025551 AMAQI
3rd Aug 2025552 AMAQI
3rd Aug 2025553 AMAQI
3rd Aug 2025574 AMAQI

28°C24/32°C

3rd Aug 2025585 AMAQI
5 AM
3rd Aug 2025586 AMAQI
3rd Aug 2025587 AMAQI
3rd Aug 2025588 AMAQI
3rd Aug 2025669 AMAQI
3rd Aug 20257010 AMAQI
3rd Aug 20256611 AMAQI
3rd Aug 20256612 PMAQI
12 PM
3rd Aug 2025681 PMAQI
3rd Aug 2025722 PMAQI
3rd Aug 2025733 PMAQI
3rd Aug 2025684 PMAQI
3rd Aug 2025665 PMAQI
3rd Aug 2025676 PMAQI
3rd Aug 2025647 PMAQI
7 PM
3rd Aug 2025598 PMAQI
3rd Aug 2025589 PMAQI
3rd Aug 20255410 PMAQI
12 AM
4 AM

--°C/°C

Day time
Avg. Highest Time
5 AM - 7 PM

50AQI

15 hours / Day
450 hours / Month
Avg. Lowest Time
5 AM - 7 PM

50AQI

15 hours / Day
450 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 5 AM to 7 PM (Avg. 50), while the lowest AQI was between 5 AM to 7 PM (Avg. 50).
Night time
Avg. Highest Time
12 AM - 4 AM

52AQI

5 hours / Day
150 hours / Month
Avg. Lowest Time
8 PM

49AQI

1 hours / Day
30 hours / Month
In the last 30 days, during the daytime, the highest AQI was between 12 AM to 4 AM (Avg. 52), while the lowest AQI was between 8 PM to 8 PM (Avg. 49).

2025 Days Vs Air Quality

Cheonan, Chonan, Chungnam, South Korea

2025

23%

49

72%

155

5%

10

Total number of days with different AQI categories in last 215 days in 2025 (150 days remaining)

Good
49 Days
Moderate
155 Days
Poor
10 Days
Unhealthy
0 Days
Severe
0 Days
Hazardous
0 Days

Under WHO’s Safe Air Quality Limits: 23%

Health Risk Level:

Very high

In 2025, 23% of 215 days were within WHO’s safe air quality limits. The risk of health issues is Very high, including respiratory issues, heart disease, and stress, particularly affecting vulnerable groups.

Annual Air Quality Insights

Cheonan, Chonan, Chungnam, South Korea

AQI levels in 2025

AQI
PM2.5
PM10
CO
SO2
NO2
O3
Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

1st January 2025
70AQI
2nd January 2025
65AQI
3rd January 2025
59AQI
4th January 2025
59AQI
5th January 2025
65AQI
6th January 2025
92AQI
7th January 2025
59AQI
8th January 2025
66AQI
9th January 2025
40AQI
10th January 2025
60AQI
11th January 2025
62AQI
12th January 2025
84AQI
13th January 2025
89AQI
14th January 2025
95AQI
15th January 2025
57AQI
16th January 2025
69AQI
17th January 2025
84AQI
18th January 2025
79AQI
19th January 2025
85AQI
20th January 2025
119AQI
21st January 2025
137AQI
22nd January 2025
139AQI
23rd January 2025
125AQI
24th January 2025
122AQI
25th January 2025
88AQI
26th January 2025
61AQI
27th January 2025
66AQI
28th January 2025
55AQI
29th January 2025
61AQI
30th January 2025
56AQI
31st January 2025
81AQI
1st February 2025
89AQI
2nd February 2025
96AQI
3rd February 2025
59AQI
4th February 2025
55AQI
5th February 2025
53AQI
6th February 2025
56AQI
7th February 2025
50AQI
8th February 2025
44AQI
9th February 2025
51AQI
10th February 2025
56AQI
11th February 2025
76AQI
12th February 2025
74AQI
13th February 2025
53AQI
14th February 2025
82AQI
15th February 2025
59AQI
16th February 2025
106AQI
17th February 2025
53AQI
18th February 2025
60AQI
19th February 2025
48AQI
20th February 2025
55AQI
21st February 2025
54AQI
22nd February 2025
58AQI
23rd February 2025
53AQI
24th February 2025
55AQI
25th February 2025
50AQI
26th February 2025
72AQI
27th February 2025
59AQI
28th February 2025
78AQI
1st March 2025
93AQI
2nd March 2025
75AQI
3rd March 2025
55AQI
4th March 2025
46AQI
5th March 2025
42AQI
6th March 2025
72AQI
7th March 2025
84AQI
8th March 2025
81AQI
9th March 2025
100AQI
10th March 2025
104AQI
11th March 2025
102AQI
12th March 2025
90AQI
13th March 2025
90AQI
14th March 2025
79AQI
15th March 2025
53AQI
16th March 2025
74AQI
17th March 2025
61AQI
18th March 2025
73AQI
19th March 2025
75AQI
20th March 2025
81AQI
21st March 2025
83AQI
22nd March 2025
96AQI
23rd March 2025
101AQI
24th March 2025
98AQI
25th March 2025
121AQI
26th March 2025
86AQI
27th March 2025
88AQI
28th March 2025
62AQI
29th March 2025
47AQI
30th March 2025
46AQI
31st March 2025
56AQI
1st April 2025
71AQI
2nd April 2025
76AQI
3rd April 2025
77AQI
4th April 2025
79AQI
5th April 2025
68AQI
6th April 2025
64AQI
7th April 2025
64AQI
8th April 2025
70AQI
9th April 2025
62AQI
10th April 2025
69AQI
11th April 2025
78AQI
12th April 2025
57AQI
13th April 2025
62AQI
14th April 2025
41AQI
15th April 2025
54AQI
16th April 2025
56AQI
17th April 2025
63AQI
18th April 2025
73AQI
19th April 2025
49AQI
20th April 2025
63AQI
21st April 2025
50AQI
22nd April 2025
44AQI
23rd April 2025
36AQI
24th April 2025
57AQI
25th April 2025
57AQI
26th April 2025
48AQI
27th April 2025
37AQI
28th April 2025
57AQI
29th April 2025
63AQI
30th April 2025
56AQI
1st May 2025
52AQI
2nd May 2025
48AQI
3rd May 2025
49AQI
4th May 2025
42AQI
5th May 2025
45AQI
6th May 2025
42AQI
7th May 2025
48AQI
8th May 2025
65AQI
9th May 2025
45AQI
10th May 2025
52AQI
11th May 2025
63AQI
12th May 2025
67AQI
13th May 2025
70AQI
14th May 2025
70AQI
15th May 2025
55AQI
16th May 2025
43AQI
17th May 2025
34AQI
18th May 2025
55AQI
19th May 2025
58AQI
20th May 2025
42AQI
21st May 2025
46AQI
22nd May 2025
52AQI
23rd May 2025
59AQI
24th May 2025
48AQI
25th May 2025
50AQI
26th May 2025
62AQI
27th May 2025
74AQI
28th May 2025
72AQI
29th May 2025
77AQI
30th May 2025
75AQI
31st May 2025
80AQI
1st June 2025
88AQI
2nd June 2025
100AQI
3rd June 2025
70AQI
4th June 2025
60AQI
5th June 2025
54AQI
6th June 2025
60AQI
7th June 2025
67AQI
8th June 2025
62AQI
9th June 2025
61AQI
10th June 2025
55AQI
11th June 2025
51AQI
12th June 2025
55AQI
13th June 2025
67AQI
14th June 2025
49AQI
15th June 2025
55AQI
16th June 2025
58AQI
17th June 2025
61AQI
18th June 2025
64AQI
19th June 2025
64AQI
20th June 2025
54AQI
21st June 2025
52AQI
22nd June 2025
51AQI
23rd June 2025
55AQI
24th June 2025
54AQI
25th June 2025
47AQI
26th June 2025
50AQI
27th June 2025
58AQI
28th June 2025
58AQI
29th June 2025
50AQI
30th June 2025
49AQI
1st July 2025
49AQI
2nd July 2025
47AQI
3rd July 2025
53AQI
4th July 2025
49AQI
5th July 2025
48AQI
6th July 2025
51AQI
7th July 2025
56AQI
8th July 2025
58AQI
9th July 2025
51AQI
10th July 2025
50AQI
11th July 2025
53AQI
12th July 2025
53AQI
13th July 2025
60AQI
14th July 2025
58AQI
15th July 2025
48AQI
16th July 2025
52AQI
17th July 2025
41AQI
18th July 2025
44AQI
19th July 2025
33AQI
20th July 2025
42AQI
21st July 2025
41AQI
22nd July 2025
39AQI
23rd July 2025
48AQI
24th July 2025
53AQI
25th July 2025
56AQI
26th July 2025
44AQI
27th July 2025
41AQI
28th July 2025
58AQI
29th July 2025
62AQI
30th July 2025
53AQI
31st July 2025
56AQI
1st August 2025
58AQI
2nd August 2025
62AQI

79AQI

63AQI

78AQI

60AQI

56AQI

59AQI

50AQI

60AQI

No. of days

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

202564AQI

1
25
5
4
23
1
4
23
4
7
23
13
18
5
25
15
16
2
49
155
10

Highest AQI recorded in

January

79AQI

Lowest AQI recorded in

July

50AQI

202460AQI

10
14
7
9
14
5
1
7
19
5
4
23
3
8
22
1
3
27
26
5
11
20
24
6
17
14
9
18
3
7
24
135
206
24
1

Highest AQI recorded in

January

77AQI

Lowest AQI recorded in

July

37AQI

202368AQI

6
17
5
3
17
6
4
1
21
9
2
22
5
1
5
21
5
2
28
17
14
19
12
19
11
12
19
16
12
1
10
15
5
1
109
209
36
8
1

Highest AQI recorded in

February

99AQI

Lowest AQI recorded in

September

43AQI

202274AQI

19
8
3
1
11
6
3
5
15
11
2
12
3
5
25
1
17
13
7
17
1
14
12
2
11
14
6
3
16
9
2
5
22
4
71
176
50
8

Highest AQI recorded in

February

95AQI

Lowest AQI recorded in

August

22AQI

202174AQI

5
19
7
2
16
7
3
3
14
10
2
2
4
23
3
7
20
2
1
1
3
26
1
15
16
15
16
23
7
6
20
5
5
17
6
2
5
15
11
93
209
52
7
3
1

Highest AQI recorded in

March

107AQI

Lowest AQI recorded in

September

44AQI

202062AQI

3
10
6
15
12
6
3
27
20
11
17
14
19
11
7
19
5
4
17
8
1
2
18
10
1
93
148
23
2

Highest AQI recorded in

December

86AQI

Lowest AQI recorded in

July

41AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded
2021(Avg.)
74AQI
Least Polluted Year Recorded
2024(Avg.)
60AQI

Cheonan's annual 2025 AQI (64) shows an average percentage change of -5.2% (improved AQI) compared to previous years: 2020 (62), 2021 (74), 2022 (74), 2023 (68), 2024 (60).