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

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

26 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Pubal at 32.5 µg/m³, #249 of 2,809 cities in the world. Cleanest: Hwado at 16.7. 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 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 518K 500K0
Every city in Gyeonggi-do, South Korea ranked for March 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
    518K
  2. 2Goyang-si
    445K
  3. 3Bucheon-si
    357K
  4. 4Seongnam-si
    295K
  5. 5Ansan-si
    261K
  6. 6Hwaseong-si
    248K
  7. 7Anyang-si
    231K
  8. 8Uijeongbu-si
    170K
  9. 9Pyeongtaek
    141K
  10. 10Osan
    100K
  11. 11Gimpo-si
    85.3K
  12. 12Hanam
    82.1K
  13. 13Icheon-si
    76K
  14. 14Guri-si
    75.6K
  15. 15Yangju
    58K
  16. 16Yeoju
    46.9K
  17. 17Gwangju
    34.3K
  18. 18Yangp'yŏng
    32.3K
  19. 19Namyangju
    26.4K
  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 2025 · All cities in South Korea, March 2025 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, March 2025, smogrank.com/kr/region/gyeonggi-do/history/2025-03 (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.