Berkeley Lab thermal manikin (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A release nozzle, placed at mouth level, released CO2, a tracer for tracking small respiratory aerosols that travel with air currents in a room. Credit Berkeley Lab Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.