Lack of oxygen in some buildings....

Of course, you have probably been subjected to overheated and under ventilated buildings worldwise, and for me it can be most uncomfortable. My lung capacity is limited by fire damage, so the fresher the air is, and oxygenated, the better.
Some of the worst buildings are hotels - invariably they are heated to such a high temperature, that one who is accustomed to being cooler in doors - AND with a draught which allows oxygen in stealthily - feels suffocated ! Many modern theatres and concert halls are also somewhat user unfriendly .....
I can remember times when I have slightly opened a window at night in a private house, so that I could sleep better, and the hostess rushing in to slam it closed - "it upsets the central heating programme ... and raises the temperature in other parts of the building !"
My first encounter with lack of oxygen was - at birth ! The umbilical cord was wound firmly around my neck and I was " a nasty colour" as my Mother told me once ... So, I was wrapped up by the midwife - those were the days when hospital maternity facilities were only available in emergency cases, and my emergency was unknown prior to birth.
Pronounced as "still born", my Mother was tended to, and eventually the midwife picked up the lifeless bundle, uncovered me, and gave me a healthy slap on the back - "Hey Presto!" - I let out my first high note !!! In my view, I'm really a ghost - ooooooooooh! Now you know why I consider breathing soooooo important - I jest, but it would improve the lives of many if they took inspiration seriously.
When the respiratory system and lack of physical connection is sluggish - guess what - one feels as one imagines a slug feels, slow and lethargic ......just not so slimy....and imagine being an overheated slug - yuk !
Try to have a walk every day - or sit on a swing; when going backwards and up, take in a nice deep breath, and when you reach the fulcrom - you should have a weightless sensation that is the same as the Italian inhallare feeling - just like "floating in space" momentarily I'm assured....but cheaper to achieve -
t'will expensive with Virgin space flights !!
sincere good wishes - and you know what......k..p b.......g.....