Transboundary smoke from China worsens Korea's air quality, impacting U.S. supply chains.
Air quality remains a concern on Wednesday as smoke from wildfires burning in China is pulled toward the Korean Peninsula by northerly winds. The Seoul metropolitan area and parts of South Chungcheong Province are under an ultrafine-dust disaster warning, with emergency measures aimed at reducing fine-dust emissions in the capital region. Incheon is under an ultrafine-dust advisory. Forecasters say the central and western regions can expect poor air quality through the day.
Authorities say the cause is air pollutants originating in China as wildfire smoke travels across the border. The pollutants are tracing into Korea on a persistent north wind, driving high concentrations of fine dust in the capital region and surrounding areas. Officials have urged residents to limit outdoor activity and wear masks when outdoors.
Temperature trends are also notable. In Seoul, the current temperature is about 2.3 degrees Celsius, roughly the same as yesterday, and frost is expected to form over inland areas of the central and Honam regions.
During the daytime, a moderating southwesterly breeze is expected to lift temperatures, with Seoul reaching around 15 degrees and Gwangju about 18 degrees Celsius at midday. The milder conditions come after a period of brisk morning levels and chilly starts.
Looking ahead to Wednesday, a rain system will sweep across the country. Rain amounts inland are expected to be modest, but the southern coast and Jeju Island are forecast to receive heavier rainfall, with Jeju’s mountainous areas potentially exceeding 70 millimeters in places.
Air quality is expected to remain poor inland in the central region tomorrow, with continued health advisories for respiratory conditions. Residents are advised to take precautions, especially for outdoor activities, and to monitor local updates as conditions can change with the weather system.
Why this matters for the United States: transboundary air pollution from East Asia can affect regional health and markets beyond Korea. Poor air quality can influence productivity in Korea’s large electronics and semiconductor industries, which are integral to global supply chains, including U.S.-based manufacturers and consumers. The evolving weather and pollution patterns also inform U.S. policymakers and industry on regional climate and environmental collaboration, and they can affect travel, tourism, and international commerce between the United States and Korea.