This is just something that could help. Have you considered that the cleaners you use could trigger your sons atshma? I have researched this and found that there are studies out there that say that our household chemicals cause allergies, atshma, and linked to cancer as well. This is just a thought. But i switched to cleaners that are all nature. No toxic chemicals in them. I did this cause i kept getting headaches.This might help your son. Just a thought. if you want more info, just let me know. i would be more then willing to help you out.