Hi Scooby Doo, and welcome! I see you are a new member here having joined only a couple of hours ago. We are glad to see you already becoming engaged with the community by posting your concern in the forums section.
I am hopeful others in the community will see your inquiry and respond by sharing their own personal anecdotal experiences related to asthma and where they live.
In the meanwhile, I thought you might gain some additional insight from these articles which focus on this very topic.
First, this one, entitled 'where to live': https://asthma.net/coping/where-to-live.
And next, this article, which speaks to the worst places for allergies: https://asthma.net/living/worst-cities-allergies.
I do hope you find the information is helpful for you in a practical way.
Wishing you well,
Leon (site moderator asthma.net)