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

Most polluted cities in Gangwon-do, South Korea

15 measured cities, this year; 15 above the WHO annual guideline. Worst: Cheorwon at 18.4 µg/m³, #405 in the world.

About 46.3K people in these 4 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 citiesDaejeon: 2 measured citiesGangwon-do: 15 measured citiesNorth Chungcheong: 7 measured cities#15 Kosong: 10.2 µg/m³#14 T’aebaek: 11.6 µg/m³#13 Gangneung: 12.1 µg/m³#12 Jumunjin: 12.2 µg/m³#11 Hwacheon: 12.9 µg/m³#10 Yanggu: 13.1 µg/m³#9 Chuncheon: 13.5 µg/m³#8 Neietsu: 13.9 µg/m³#5 Sokcho: 14.9 µg/m³#6 Santyoku: 14.9 µg/m³#7 Hongch’ŏn: 14.9 µg/m³#4 Pyeongchang: 15.2 µg/m³#3 Donghae City: 15.4 µg/m³#2 Wŏnju: 17.7 µg/m³#1 Cheorwon: 18.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Wŏnju 26.7K 20K0
Every measured city in Gangwon-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. 1Wŏnju 26.7K
  2. 2Chuncheon 13.6K
  3. 3Cheorwon 3.09K
  4. 4Donghae City 2.91K
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

Bad-air episodes in Gangwon-do

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

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SmogRank, most polluted cities in Gangwon-do, South Korea, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/gangwon-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 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.