One of the more useful methods of managing with asthma is yoga and breathing exercises. this allows your lungs to expand, melts the pathways due to increased oxygen and accelerates metabolism which is very important for fighting asthma. This is great preventive therapy and will definitely wean you off medicines.

If you want temporary remedies, then try rubbing hot mustard oil on your chest and back. You should do it for around 15 mins which forces circulation to speed up in the area and creates a positive breathing experience. I have seen it work for a lot of people in tropical areas