Pigeons make the very air you breathe highly toxic with bacteria and spores. Doctors say that pigeon droppings, loose feathers and the dust they shake when fluttering their wings is the cause of an alarming spread of Asthma and upper respiratory illnesses. In case of Pigeon netting we use net size of mesh 2” (40/50 mm). Our netting is very fine & is hardly visible. Our netting doesn’t harm birds it just acts as a barrier for them from entering.