Tests prove masks dont cause oxygen deficiency & CO2 intoxication

Does wearing a mask hinder breathing—either by reducing oxygen intake or causing carbon dioxide buildup? Some people think so, but these two simple, clinical tests prove otherwise. Masks do not hinder breathing and are an essential part of the effort to reduce coronavirus spread. Pulse oximetry is a simple, noninvasive and painless test often conducted in clinics. A small, clip-like device is attached to a body part, typically a finger, toe or earlobe. It uses infrared light to measure oxygen saturation le