They have advised people to adjust their levels of outdoor activity, according to the guidelines of the National Institute for Public Health, the NIJZ.

They have also recommended monitoring air quality on a regular basis to check particle levels.

Large plumes of Saharan dust and sand can spread across Europe at any time but usually depend on the season. From late spring to early autumn, the Saharan Air Layer carries dust high up into the atmosphere.

Large dust storms in the Sahara usually coincide with southerly winds.

Foto: EPA
Foto: EPA