Which of the following is NOT a type of fog?

Monsoon is not classified as a type of fog. Fog is typically defined as a collection of tiny water droplets or ice crystals suspended in the air near the Earth's surface that reduce visibility. There are several recognized types of fog based on the mechanisms of their formation.

Upslope fog occurs when moist air rises over terrain such as hills or mountains, cooling and condensing to form fog as it ascends. Advection fog develops when warm, moist air moves horizontally over a cooler surface, allowing the air to cool and condense into fog. Radiation fog forms under clear skies during calm and cool nights when the ground loses heat, cooling the air close to the surface and resulting in condensation.

Monsoon, on the other hand, refers to a seasonal wind pattern characterized by a marked shift in prevailing winds, often bringing significant changes in precipitation. It is not a type of fog, but rather a climatic phenomenon that influences weather patterns, particularly in regions affected by monsoonal systems.