We know, maximum rays of the sun reach the equator and minimum at the poles making the equator hot compared to poles where it is colder. This causes the air in these regions to remain relatively cold, thereby creating a high-pressure region. The air between the 30° to 60° latitude belts is warmer in comparison to the air near the poles. Hence, this warm air rises up and cold air from the Polar Regions rush in to fill the empty space.