Seoul city issues first ultrafine dust advisory this winter stocking 0 74 2020.11.16 14:53 https://youtu.be/qiKNDxjBf7Y + 2 올가을 첫 초미세먼지 주의보…오늘도 '나쁨' The first ultrafine dust advisory of the season was issued for Seoul on Monday. According to the National Institute of ...