Thanks Sue for your excellent list. All of these pro-active care measures are just habit now.
I use an I.Q. Air Filter in my apartment. On hot days, I run an air conditioner.. yes, clean the filters regularly.
And, what I think has proved very helpful is wearing a mask every time I go outside. Have done this for 15 years. Did drop my lung infection flare-ups greatly; from 4 to 5 a year to one to 2.