A NASA image, rendered Feb. 7, shows a large plume of smoke spreading southward from fires, outlined in red, burning west of Churchill in Victoria's Gippsland region.

As the latest sandstorm moved southeast, south Korea's national weather agency issued a yellow dust advisory for Seoul and other parts of the country.

Substantial rainfall will hit most of the area to the south of the Huaihe River in 3 days after the Qingming Festival, according to the China Meteorological Administration.