Hi,
For Astma, I found some info here =>
Fakta om astma - NAAF
There is also a dedicated department in Stavanger hospital called "lungeseksjon". Here is their phone number: 0047 51 51 85 24.
I've been living in Stavanger for 5 years so if you have question you can ask and I'll try to answer :-).
Not a lot to say appart that you should be prepared for a terrible weather and an amazing nature!