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

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

15 cities in Gangwon-do, South Korea ranked by their average PM2.5 over the 31 days. Worst: Wŏnju at 29.3 µg/m³, #293 of 2,947 cities in the world. Cleanest: Kosong at 20.4. A city needs measurements on 70% of the days to be ranked.

About 169K people in these 4 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.

← Wŏnju 96.6K 90K0
Every city in Gangwon-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. 1Wŏnju
    96.6K
  2. 2Chuncheon
    45.9K
  3. 3Donghae City
    16.3K
  4. 4Cheorwon
    10.5K
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 · Gangwon-do now

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