Q. Why are there holes in pizza boxes?

Answer

The holes are located on the side of the boxes in order to serve a secondary function, which is to prevent the food within from being contaminated. Because the boxes are then put in fabric bags, there is a possibility that the pizzas may get contaminated as a result of the restriction of airflow. Because of the openings, there is a continuous flow of air within the box, which helps limit the risk of contamination.