Allergic of Dust

Have you ever heard that a person can have an allergic of dust? I think my son have this kind of allergic. At least, this was the first diagnose from his pediatric when we visited her this morning. Every morning, my son has a little cough and slam and I am a bit worried about this. That's why I brought him to visit the pediatric to have a medical check up. The doctor said that there are few reasons that can caused this cough and slam on my son. She mentioned few things and one of it is about dust. The room where the children normally play is covered with carpet. This can be the reason of the dust. Now, I have to see if we have a budget to change the carpet with normal floor.