SmogRank / South Korea / Gangwon-do / Sokcho
Sokcho, month by month
Sokcho has a measured daily mean on 911 days since 24 March 2024. Its worst month was April 2024, at 83 US AQI (26.3 µg/m³), 109th of 2,520 cities on that month's world ranking. Its cleanest was October 2025, at 21 US AQI (3.8 µg/m³). 2025 averaged 55 US AQI (11.3 µg/m³), against 61 US AQI (14.6 µg/m³) in 2024.
Every month since 2024
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
Months without a mean, and why
1 month
| Month | Why |
|---|---|
| Mar 2024 | 8 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Sokcho's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| April 2024 | 8326.3 µg/m³ | 109thof 2,520 | Japan and South Korea, April 2024 South Korea, 6 to 9 April 2024 |
| March 2026 | 7924.0 µg/m³ | 462ndof 2,971 | Japan and South Korea, March 2026 South Korea, 15 to 18 March 2026and 1 more |
| June 2024 | 7723.2 µg/m³ | 72ndof 2,563 | South Korea, June 2024 South Korea and Japan, June 2024 |
| February 2026 | 6918.6 µg/m³ | 613thof 2,866 | South Korea and Japan, 19 to 21 February 2026 South Korea and Japan, 10 to 15 February 2026and 1 more |
| May 2024 | 6717.5 µg/m³ | 197thof 2,684 | – |
| June 2026 | 6516.8 µg/m³ | 291stof 2,497 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Sokcho's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Apr 2024 | 16068.4 µg/m³ | Japan and South Korea, April 2024 |
| 18 Apr 2024 | 15763.5 µg/m³ | Japan and South Korea, April 2024 |
| 24 Mar 2026 | 15662.2 µg/m³ | Japan and South Korea, March 2026 |
| 25 Mar 2026 | 15561.4 µg/m³ | Japan and South Korea, March 2026 |
| 16 Apr 2024 | 15256.3 µg/m³ | Japan and South Korea, April 2024 |
| 14 Feb 2026 | 15156.2 µg/m³ | South Korea and Japan, 10 to 15 February 2026 |
| 26 Mar 2026 | 14553.2 µg/m³ | Japan and South Korea, March 2026 |
| 13 Feb 2026 | 14453.0 µg/m³ | South Korea and Japan, 10 to 15 February 2026 |
| 20 Jan 2025 | 12645.6 µg/m³ | Japan and South Korea, 17 to 24 January 2025 |
| 11 Jun 2024 | 10938.6 µg/m³ | South Korea and Japan, June 2024 |
Daily means, the highest since 24 Mar 2024; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Sokcho, South Korea, 24 Mar 2024 – 12 Oct 2026. Monitor data from Korea Air Ministry of Environment via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/kr/sokcho/history (accessed 12 Oct 2026).
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.
Sokcho now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).