Mathew Johnsson, University of Copenhagen (IMAGE) University of Copenhagen Caption This is a picture of the researcher and inventor of new air cleaning technology. Mathew Johnsson from the University of Copenhagen. Credit University of Copenhagen Usage Restrictions None License Licensed 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.