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

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

26 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 30 days. Worst: Hwado at 14.8 µg/m³, #336 of 3,052 cities in the world. Cleanest: Wabu at 4.0. 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.

← Hwado 0% 0.75%0

Every city in Gyeonggi-do, South Korea ranked for September 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.

1Hwado
0%
2Pyeongtaek
0%
3Hwaseong-si
0%
4Gimpo-si
0%
5Icheon-si
0%
6Gwangmyeong
0%
7Ansan-si
0%
8Osan
0%
9Suwon
0%
10Bucheon-si
0%
10Goyang-si
0%
12Pubal
0%
13Uijeongbu-si
0%
14Anyang-si
0%
15Guri-si
0%
16Hanam
0%
17Munsan
0%
18Gwangju
0%
19Namyangju
0%
20Seongnam-si
0%
21Anseong
0%
22Yeoju
0%
22Yangp'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, September 2025 · All cities in South Korea, September 2025 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, September 2025, smogrank.com/kr/region/gyeonggi-do/history/2025-09 (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.