Prince
If you're refering to yesterday's wonderful "so chunky, you could carve it" 700m viz, as TAD's memory was correct, the wind was basically 320/5 most of the day, bringing down the sh1te from "up there".
Today it went round to the east blew it all back again.
Don't worry, all the factories will close down for a couple of weeks over CNY and you'll be able to breathe again.
Then again, don't hold your breath.