CCUK
Free Flying
You are being reckless in recommending that someone keeps a pigeon inside. You do know the risk of pigeon fancier lung. It isn't the same as any other animal dander. Pigeons have a higher concentration of proteins in their droppings and dander, that is what causes it. How clean you keep your loft, enclosure, whatever has nothing to do with it. It is in the atmosphere.Its nothing like cigarette smoke. Its just dander like any animal has.