oxygenating 

deep breathing

the guy was oxygenating when he had an athsma attack

oxygenating by campy October 28, 2003

oxygenation nation 

A nation that has acceptable levels of air pollution.

In a science-fiction comedy I am reading, the United States of America is flatteringly called "oxygenation nation."

oxygenation nation by but for December 6, 2017

oxygenation 

rejuvenating a room with fresh air or oxygen. Usually with a fan.

We need some oxygenation in your room.

oxygenation by iolive May 23, 2022