A simple face mask is usually used to deliver a low to moderate amount of oxygen. A simple mask contains holes on the sides to let exhaled air through and to prevent suffocation in case of a blockage.

Simple oxygen masks. Like nasal cannulas, a simple face mask provides a small amount of extra oxygen. These masks can be worn when a nasal cannula isn’t working or isn’t practical, ...

The simple act of wearing a mask amid the ongoing COVID-19 pandemic has become a politically charged topic in the U.S. and across social media.

You should know the safety spiel well by now – “In the event of emergency, put your oxygen mask on first.” But have you ever wondered why the cabin crew is so careful to hammer this ...