"Where is yellow dust coming from?"
Translation:황사는 어디에서 옵니까?
Yellow dust is a weather phenomenon in East Asia. It starts in the Gobi desert and picks up air pollution as it passes over industrial areas. This is why you see pictures of people wearing masks. The etymology of the word comes from two hanja characters. 황 Which translates to yellow. And 사 which translates to dust or sand.
I think this is referring to the phenomenon where wind blows yellow dust from China to the Korean peninsula, which causes poor air quality at times.
I don't know if you could use it to refer to yellow dust in general, but I'm just learning too, so I don't know how broadly it may be used.
On another note, I'd advise not using simplified Hanzi here. Simplified is NOT in any way shape or form part of Korean
Its a term for the sand (tiny particles&pollution) picked up from the asian deserts and cities by tje spring winds blowing from the west. https://en.m.wiktionary.org/wiki/%E9%BB%83%E7%A0%82