Parrots are exquisitely sensitive to toxins, especially those in the air that they breathe. We all remember the stories of canaries being taken into coal mines as sentinels to warn of the accumulation of deadly gases because they were so highly vulnerable to the adverse effects of toxic fumes. The respiratory system of birds is so much more sensitive than ours that they will be harmed by unsafe indoor air long before we become aware of the danger.
This is a must read article for everyone, even if you do not have parrots!!!