Western physiological norms for breathing were established about 100 years ago. Typical CO2 concentrations in the lungs andarterial blood were about 5.5-6%, with a lung ventilation of about 5-6 l/min. The usual CPs of ordinary people were in a range from 40 to 50 s. The CPs of people nowadays are about 25-30 s. We breathe more air and have lower CO2 concentrations. We also have less oxygen in our vital organs. Why? Modern civilization has brought about some negative changes affecting our breathing and health.Let us look at them again in more details.

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