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.
About 38.8K people in these 20 cities breathed unhealthy air on an average day of October 2025.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Hwaseong-si 20.7K
- 2Pyeongtaek 11.8K
- 3Icheon-si 6.33K
- 4Gimpo-si 0
- 5Suwon 0
- 6Ansan-si 0
- 7Uijeongbu-si 0
- 8Bucheon-si 0
- 9Goyang-si 0
- 10Osan 0
- 11Munsan 0
- 12Guri-si 0
- 13Yeoju 0
- 13Gwangju 0
- 13Anyang-si 0
- 16Hanam 0
- 17Seongnam-si 0
- 17Namyangju 0
- 19Yangp'yŏng 0
- 20Yangju 0
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
Use this board
SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, October 2025, smogrank.com/kr/region/gyeonggi-do/history/2025-10 (accessed 6 Oct 2026).
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.