A total of about 350,000 metric tons of ozone are formed and destroyed daily in the ozone layer. zone never makes more than a small fraction of the g in te ozone layer. In fact, if the entire up atmosphere's ozone were averaged in uniform layer at sea level temperature of 25°C and 1 atm a at a pressure, it would be only 3 thick! This would r an ozone lay of 0.3 atm-cm. The total amount of ozone in the atmosphere above particular location is measured in Dob units (DU). The DU is 0.001 atm-cm so the average ozone layer is about 300 DU.