Ultrafine dust levels 'bad' for first time in 110 da… stocking 0 165 2020.10.21 11:24 https://youtu.be/APKynmrgdY4 + 12 110일만에 찾아온 초미세먼지... 다음 달부터 본격화 Ultrafine dust reached 'bad' levels in Seoul on Tuesday,… for the first time since July. Experts forecast the ...