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

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

26 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Pubal at 37.5 µg/m³, #60 of 2,426 cities in the world. Cleanest: Gapyeong at 22.1. A city needs measurements on 70% of the days to be ranked.

About 1.75M people in these 20 cities breathed unhealthy air on an average day of January 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.

← Suwon 279K 200K0
Every city in Gyeonggi-do, South Korea ranked for January 2025 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Suwon
    279K
  2. 2Goyang-si
    240K
  3. 3Bucheon-si
    165K
  4. 4Seongnam-si
    148K
  5. 5Ansan-si
    141K
  6. 6Anyang-si
    115K
  7. 7Pyeongtaek
    106K
  8. 8Hwaseong-si
    103K
  9. 9Uijeongbu-si
    77.3K
  10. 10Icheon-si
    69.6K
  11. 11Osan
    53.9K
  12. 12Yeoju
    43.3K
  13. 13Gimpo-si
    39.4K
  14. 14Guri-si
    37.8K
  15. 15Yangp'yŏng
    29.6K
  16. 16Yangju
    29K
  17. 17Hanam
    24.6K
  18. 18Gwangju
    21.1K
  19. 19Namyangju
    14.6K
  20. 20Munsan
    9.76K
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, January 2025 · All cities in South Korea, January 2025 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, January 2025, smogrank.com/kr/region/gyeonggi-do/history/2025-01 (accessed 6 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.