How does the increased pressure play a role?

Under normal atmospheric conditions (1 ATA or sea level) we are subjected to approximately 14.7 pounds per square inch (psi) of pressure and the air we breathe is composed of 21% oxygen and 79% nitrogen. During HBOT the pressure can be increased up to three times normal atmospheric pressure (3 ATA) creating a higher partial pressure or concentration of oxygen.

• If you breathe air at 2 ATA, you would be breathing an equivalent of 42% oxygen
• If you would breathe 100% oxygen at  2 ATA, you would be breathing an equivalent of 200% oxygen
• 1 ATA = Sea Level, 2 ATA = 33 feet of depth, 3 ATA = 66 feet of depth