PSA: if you have chronic, low-level respiratory/sinus problems, there is a good chance it is caused by poor air quality in your place of residence. There are a lot of possible causes, including mold, bad carpeting, and poorly maintained HVAC systems.

I may be especially vulnerable, but I've experienced significant respiratory problems caused by bad air in several different apartments over the years. A couple of years ago, I was going through a particularly bad episode, and I thought I had simply developed adult-onset allergies to standard allergens (pollen, etc) but I noticed that when I spent a week away on a family visit, the symptoms almost went away. Then I moved out of the place with bad air, and the problems disappeared in a matter of weeks.

The good news is: it should be easy to tell if your apartment is causing problems, by staying elsewhere for a couple of days and noticing changes in the symptoms. The bad news is, if you'd prefer to fix the problem instead of moving to a different place, it might be hard to do, or even to identify the problem exactly.