Does air resistance increase or decrease the acceleration of a falling object

the total acceleration decreases when a body falls until it reaches the value of zero.

Explanation:

In general, resistive forces always oppose the movement of bodies, when a body falls into the air it is subject to two forces, the gravitational attraction and the resistive force of the air that opposes this movement, this force is proportional to the speed and the size of the body increases its value until it equals the acceleration of gravity and from this moment the body moves with constant speed.

In summary, the total acceleration decreases when a body falls until it reaches the value of zero.