Dust is obscuring vision in Lhasa, capital of Southwest China's Tibet Autonomous Region on Thursday, disrupting flights.

Known as "city of sunshine," Lhasa normally basks under blue skies with barely any foggy day.

Liu Yijun, a senior engineer at the local meteorological observatory, said a sharp drop in temperature, lower pressure and accumulated particulates are the main causes of the murk which is forecast to last for another two days.

The dust cloud first manifested in Lhasa and the neighboring counties of Quxu and Gonggar early on Thursday morning.

Poor visibility at Gonggar Airport in Lhasa meant two flights were canceled and another seven unable to land. The airport had resumed normal operation by 2 pm.