The successor BMT OZONE EXPOSURE SYSTEM OES 1.1
is based on the experiences made with the OES 1.0. The most important feature of the OES 1.1 is two-channel inspiratory pneumotachometry for both subjects. The pneumotachometers continuously measure the mass flow rate of the inspired air/ozone. For each subject the average inspired air/ozone (per minute) is calculated and displayed, and additionally the total inspired air/ozone from the beginning of the experiment. This important information now provides the prerequisite for comparable results of ozone breathing experiments performed by different researchers at different places on earth.