SmogRank / World / South Korea / Gyeonggi-do / March 2026

Most polluted cities in Gyeonggi-do, South Korea, March 2026

26 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Pubal at 36.2 µg/m³, #180 of 2,947 cities in the world. Cleanest: Gapyeong at 27.0. A city needs measurements on 70% of the days to be ranked.

About 3.3M people in these 20 cities breathed unhealthy air on an average day of March 2026.

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 597K 500K0
Every city in Gyeonggi-do, South Korea ranked for March 2026 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
    597K
  2. 2Bucheon-si
    384K
  3. 3Goyang-si
    377K
  4. 4Hwaseong-si
    310K
  5. 5Ansan-si
    281K
  6. 6Seongnam-si
    266K
  7. 7Pyeongtaek
    212K
  8. 8Anyang-si
    192K
  9. 9Uijeongbu-si
    108K
  10. 10Osan
    108K
  11. 11Guri-si
    75.6K
  12. 12Gimpo-si
    72.2K
  13. 13Hanam
    65.7K
  14. 14Icheon-si
    63.3K
  15. 15Yeoju
    46.9K
  16. 16Yangju
    46.4K
  17. 17Namyangju
    29.3K
  18. 18Yangp'yŏng
    26.9K
  19. 19Gwangju
    23.7K
  20. 20Munsan
    15.3K
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, March 2026 · All cities in South Korea, March 2026 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, March 2026, smogrank.com/kr/region/gyeonggi-do/history/2026-03 (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.