Weather officials in South Korea have issued a yellow sand warning for nearly all parts of the country, as fine particles from deserts in northern China and Mongolia are blanketing the skies.
The Korea Meteorological Administration issued the warning on Monday after dust brought by northwesterly winds was observed.
Public broadcaster KBS reported that this is the first time in about six years that the warning has been issued for large parts of the country. KBS aired footage of high-rise buildings along the Han River in central Seoul that have been obscured by the dust.
The weather officials forecast that the dust storm will weaken from Tuesday.
But the storm has raised concentrations of the airborne pollutants known as PM 2.5.
The government is urging schools to cancel classes outside buildings and says people with respiratory problems should stay indoors.