Hi , and thanks for your post and question - it's a good one! I see you've already elicited some pertinent comments from our good community members, @CopdGirl and .
I also have something to contribute. Although this can vary, from patient-to-patient, living at high altitudes may have an effect on one's breathing capabilities, especially with pulmonary disease. This is because the atmosphere is 'thinner' at higher elevations. This means there is a reduced oxygen content in the atmospheric air that is available at that particular altitude. This can affect folks without pulmonary disease, too. As said - it can vary among people.
I thought you might find it helpful to read about high altitude and see how, and if, you think this is applicable to your case. It is from our sister site, asthma.net. I would also suggest that you discuss this at length with your own private medical doctor (PMD).
Here is the link: https://asthma.net/uncategorized/asthma-altitude. I do hope you find the information is helpful in a practical way.
Wishing you well,
Leon (site moderator COPD.net)