I live in Alabama and boy do we have humidity - I do find it difficult to breathe when it is very humid.
I was not diagnosed with asthma until I was about 40, all my life I had suffered with allergies and had bronchitis a lot. Since I can remember, I couldn't breathe in hot wet places - saunas were the worst. The health club I belonged to had a sauna, couldn't breathe in there, some friends also had a sauna and by 1977 I had figured out to avoid all saunas and try to stay inside when it was really humid.
When I was diagnosed with asthma, it was Memorial Day weekend and had rained for several days, I will always be 'sick' in the spring and again in the fall. This time I had spent most of Saturday night sitting up on the couch trying to breathe, Sunday night it got even worse, I just went in and told my husband I was going to the ER I thought I had pneumonia. When I got there
and was reading the signs that said "Please do not come to ER if you think you have something that can wait until the Doctor's office opens" I decided that I had pneumonia and should go ahead. The nurse that processed me in could hear no chest sounds, she called someone else in and tried again - they gave me one breathing treatment and a shot, don't remember what it was, and then tried again, this time you could hear wheezing. Long story short, I ended up staying the night because you can't leave until your oxygen level is something and you can blow at least 150 on the flowmeter. The doctor could not believe I had never been diagnosed before, but as I said I always just suffered through and because of allergies just thought that was life.
My asthma is allergy induced - when I went to an allergist I tested positive for: dust mites, grass, ragweed, pollens, cats and dogs. Dust mites are more active in humid air, the doctors explanation: humid air is heavier and you breathe in more allergens with each breath. Since I am allergic to most of the things outside my house I have never been able to sleep with the windows open, even before I knew I had asthma. Another thing to do that can control dust mites is wash your sheets in hot water at least once a week, this kills the dust mites. When my husband saw the list of things to do to prevent allergies he asked if there was any comfort left. I am sure most of you have those lists: No rugs, no curtains, plastic pillow covers, no plants, no pets.
Now I am on Singulair, Advair and have albuterol, everything stays pretty much under control and have not had to have an emergency room visit for about 3 years now.