降塵 [－尘]

Jyutping gong3 can4
Pinyin jiàng chén

Definitions (CC-CEDICT)
  1. dust fall
  2. fallout (volcanic, nuclear etc)
  3. particulate matter
Definitions (Wiktionary)
  1. noun
    dust which has fallen from the air
  2. verb
    to make dust in the air fall to the ground