What is haar?

Haar is a type of fog that is commonly found in coastal areas, especially in Scotland and Ireland. It is formed when warm, moist air moves over a colder surface, which causes the water vapor to condense into small droplets that remain suspended in the air. The fog is often thick and can reduce visibility to just a few meters, making it hazardous for drivers and sailors. Haar is most prevalent during the spring and summer months when the contrast between the warm air and cold sea surface is highest. The word "haar" is derived from the Scots language, and it is also known as sea fog or coastal fog.