SmogRank / World / Asia / South Korea / Gyeonggi-do

Most polluted cities in Gyeonggi-do, South Korea

26 measured cities, this year; 26 above the WHO annual guideline. Worst: Pubal at 21.5 µg/m³, #330 in the world.

About 789K people in these 20 cities breathed unhealthy air on an average day so far this year.

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.

Seoul: 2 measured citiesIncheon: 2 measured citiesGyeonggi-do: 26 measured citiesGyeongsangbuk-do: 17 measured citiesChungcheongnam-do: 14 measured citiesGangwon-do: 15 measured citiesNorth Chungcheong: 7 measured cities#26 Yangju: 14.0 µg/m³#25 Yangp'yŏng: 15.5 µg/m³#24 Seongnam-si: 15.8 µg/m³#22 Gapyeong: 16.2 µg/m³#23 Namyangju: 16.2 µg/m³#21 Gwangju: 16.4 µg/m³#20 Uijeongbu-si: 16.5 µg/m³#19 Munsan: 16.6 µg/m³#18 Hanam: 16.8 µg/m³#15 Suwon: 17.2 µg/m³#16 Anyang-si: 17.2 µg/m³#17 Anseong: 17.2 µg/m³#14 Goyang-si: 17.3 µg/m³#12 Hwaseong-si: 17.4 µg/m³#13 Wabu: 17.4 µg/m³#9 Bucheon-si: 17.7 µg/m³#10 Osan: 17.7 µg/m³#11 Icheon-si: 17.7 µg/m³#8 Ansan-si: 17.9 µg/m³#7 Guri-si: 18.1 µg/m³#6 Pyeongtaek: 18.4 µg/m³#5 Hwado: 18.8 µg/m³#4 Gwangmyeong: 19.1 µg/m³#3 Gimpo-si: 19.6 µg/m³#2 Yeoju: 19.7 µg/m³#1 Pubal: 21.5 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Suwon 129K 100K0
Every measured city in Gyeonggi-do, South Korea 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 129K
  2. 2Goyang-si 92K
  3. 3Bucheon-si 88.7K
  4. 4Seongnam-si 75.7K
  5. 5Hwaseong-si 74.7K
  6. 6Ansan-si 60.8K
  7. 7Anyang-si 49.3K
  8. 8Pyeongtaek 43.4K
  9. 9Uijeongbu-si 32.9K
  10. 10Osan 24.1K
  11. 11Gimpo-si 19K
  12. 12Icheon-si 17.6K
  13. 13Hanam 17.4K
  14. 14Guri-si 16.9K
  15. 15Yangju 12.3K
  16. 16Yeoju 10.3K
  17. 17Namyangju 6.96K
  18. 18Yangp'yŏng 6.81K
  19. 19Gwangju 6.59K
  20. 20Munsan 3.97K
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

Estimated: cities without a monitor

Gyeonggi-do cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Gunpo≈ 10 µg/m³Moderate
Uiwang≈ 10 µg/m³Moderate

Bad-air episodes in Gyeonggi-do

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/kr/region/gyeonggi-do?w=year.

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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.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.