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

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

25 cities in Gyeonggi-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Pubal at 19.0 µg/m³, #304 of 2,852 cities in the world. Cleanest: Yangju at 11.3. A city needs measurements on 70% of the days to be ranked.

About 296K people in these 20 cities breathed unhealthy air on an average day of May 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.

← Hwaseong-si 42.7K 40K0
Every city in Gyeonggi-do, South Korea ranked for May 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. 1Hwaseong-si
    42.7K
  2. 2Suwon
    39.8K
  3. 3Goyang-si
    34.3K
  4. 4Seongnam-si
    29.5K
  5. 5Bucheon-si
    27.4K
  6. 6Ansan-si
    20.1K
  7. 7Anyang-si
    19.2K
  8. 8Uijeongbu-si
    15.5K
  9. 9Pyeongtaek
    11.8K
  10. 10Hanam
    8.21K
  11. 11Osan
    7.7K
  12. 12Gimpo-si
    6.56K
  13. 13Icheon-si
    6.54K
  14. 14Yangju
    6.43K
  15. 15Guri-si
    6.3K
  16. 16Yeoju
    3.61K
  17. 17Yangp'yŏng
    3.09K
  18. 18Namyangju
    2.93K
  19. 19Gwangju
    2.64K
  20. 20Munsan
    1.44K
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, May 2026 · All cities in South Korea, May 2026 · Gyeonggi-do now

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SmogRank, most polluted cities in Gyeonggi-do, South Korea, PM2.5, May 2026, smogrank.com/kr/region/gyeonggi-do/history/2026-05 (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.