Twelve months in the equatorial region, the sun's rays fall directly on the heat.
The air swells with heat.
Becomes thinner, occupies more space and climbs up.
So there is a slight pressure of air.
In addition, the equatorial region consists mainly of oceans and dense forests on land.
Due to the intense heat of the sun, water evaporates on a large scale for many months and evaporation takes place in the forests.
So the air here is very humid.
It also lowers the air pressure.
Thus, there is a slight pressure of air in the equatorial regions for many months.