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

Most polluted cities in Gangwon-do, South Korea

15 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Cheorwon at 13.6 µg/m³, #395 in the world.

About 0 people in these 4 cities breathed unhealthy air on an average day over the last 30 days.

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: 25 measured citiesGyeongsangbuk-do: 17 measured citiesChungcheongnam-do: 14 measured citiesDaejeon: 2 measured citiesGangwon-do: 15 measured citiesNorth Chungcheong: 7 measured cities#15 Kosong: 5.5 µg/m³#14 T’aebaek: 5.7 µg/m³#13 Chuncheon: 6.6 µg/m³#12 Yanggu: 6.7 µg/m³#11 Hwacheon: 6.8 µg/m³#10 Hongch’ŏn: 6.9 µg/m³#9 Jumunjin: 7.1 µg/m³#8 Neietsu: 7.6 µg/m³#7 Pyeongchang: 8.3 µg/m³#6 Gangneung: 9.0 µg/m³#5 Santyoku: 9.1 µg/m³#3 Wŏnju: 9.9 µg/m³#4 Sokcho: 9.9 µg/m³#2 Donghae City: 11.4 µg/m³#1 Cheorwon: 13.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Cheorwon 0 0.750
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. 1Cheorwon 0
  2. 2Donghae City 0
  3. 3Wŏnju 0
  4. 4Chuncheon 0
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, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/kr/region/gangwon-do?w=30d.

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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.