Our family had been living at high elevation
in a semi-arid country. When we took a trip to
New Delhi (hot, humid, low-lying) my young son had trouble breathing and was diagnosed with asthma. We returned to our mountain aerie and the asthma disappeared. He went with a young friend to Israel (hot, humid, low-lying) and the asthma returned. I have COPD and suffer on humid summer days. Whether this is due emphysema as well as asthma I do not know.