I moved here from the UK about 3 months ago, and my asthma's vastly improved. My main trigger is house dust mites, and I think being in a house with no carpets is very good for me. I'm also allergic to cats, horses, that sort of thing, but just pop an anti-histamine if I know I'll be near them for any length of time.

Breath training exercise: breathing normally but steadily, exhale all the air in your lungs. Then stop. Hold your breath. Count how many seconds until you need to breath in again. Apparently 'normal' non-asthma people can hit at least a minute, whereas I feel like I'm imploding after 30 seconds. Your rate improves with practise - something to do with the way your body processes carbon dioxide, I think.

kodokan