烏煙塵 [乌烟尘]

Jyutping wu1 jin1 can4
Pinyin wū yān chén

Definitions (Wiktionary)
  1. noun, Min-Nan
    soot; cinder
    (syn.) 烟尘, 煙垢, 烟垢, 烟尘乌, 煙塵烏, 煙塵