My daughter has almost always cold and coughs a lot (seems a dry cough). Doctors suggest Montair, Ventorlin which works for a time being and again the symptoms begin. I have observed that in our area there is a lot of exposure to dust. She did not have this problem when we went to native where dust was less. Do you think this will continue or with age she will develop immune against this dust exposure? Please suggest next steps that we can take to prevent and cure this.