Sir, my son was absolutely fine 8 months back When he started developing dry cough on and off every 2 to 3 days no other complaints , we are basically from hyderabad and presently staying in kerala, he is asymptomatic in hyderabad but as we come to kerala immediately after 2 days he will be developing cough. People of this place say that many children are having this symptoms due to allergic to few trees here. And also we stay in old quaters which has moisture always .presently symptoms are subsiding with cetrizine and ambroxol syrup,Chest x ray done which is also normal, kindly please suggest some permanent solution sir