SmogRank / World / South Korea / Gyeonggi-do / October 2025

Most polluted cities in Gyeonggi-do, South Korea, October 2025

26 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Pyeongtaek at 11.9 µg/m³, #428 of 2,564 cities in the world. Cleanest: Wabu at 4.6. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Pyeongtaek 3% 3%0

Every city in Gyeonggi-do, South Korea ranked for October 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

1Pyeongtaek
3%
1Pubal
3%
3Icheon-si
3%
4Anseong
3%
5Hwaseong-si
3%
6Gimpo-si
0%
7Hwado
0%
7Gwangmyeong
0%
9Suwon
0%
10Ansan-si
0%
11Uijeongbu-si
0%
12Bucheon-si
0%
13Goyang-si
0%
14Osan
0%
15Munsan
0%
16Guri-si
0%
17Yeoju
0%
17Gwangju
0%
17Anyang-si
0%
20Hanam
0%
21Seongnam-si
0%
21Namyangju
0%
23Yangp'yŏng
0%
24Yangju
0%
25Gapyeong
0%
26Wabu
0%

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, October 2025 · All cities in South Korea, October 2025 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, October 2025, smogrank.com/kr/region/gyeonggi-do/history/2025-10 (accessed 7 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.