What should a pilot do if they encounter fog during a landing approach?

When a pilot encounters fog during a landing approach, the most prudent action is to abort the landing and circle until visibility improves. Fog significantly reduces visibility, which can greatly hinder a pilot's ability to safely land the aircraft. By circling, the pilot can maintain control of the aircraft and wait for conditions to improve, avoiding the risks associated with attempting to land in poor visibility.

Landing quickly is not advisable, as this approach can lead to dangerous situations if the pilot cannot see the runway or any obstacles. Descending below the fog level might seem like a quick solution, but this could lead to flying into terrain or obstacles that are not visible from the fog-covered altitude. Requesting assistance from other aircraft could be helpful in some situations, but it does not directly address the immediate need for safe landing or visibility improvement during the approach. Therefore, waiting and ensuring that the approach and landing will be safe is the best course of action.