Which term describes the decrease in air circulation due to obstacles?

The most accurate term that describes the decrease in air circulation due to obstacles is air obstruction. Air obstruction refers to the physical barriers that interfere with the free flow of air, leading to a reduction in ventilation or circulation in an area. In mining contexts, this could relate to various factors such as equipment, structural elements, or natural formations that hinder the movement of air within the mine.

Selecting air resistance might lead to some confusion as this term commonly refers to the forces opposing the motion of an object through air. While air turbulence might suggest disruptions in airflow, it does not specifically indicate a decrease in overall circulation due to obstacles. Air filtration pertains to the process of removing particulates or contaminants from air, which is unrelated to the concept of obstacles affecting airflow. Thus, air obstruction is the term that best encapsulates the described phenomenon.