Has he had to have nebulizer treatments at the doctor's office or at the ER? In the U.S. they make small, portable ones that run around $100. You can even use it in your car. I have to carry an epi pen because of the severity of my asthma and I don't leave home without my nebulizer. I am always prepared. I still have a lot of living I want to do.
Maybe bringing up some statistics of how many people die each year, maybe even how many children, do you think that would make a difference to him. When I get some spare time, I will see what I can find. Remind me next week.