Exhaling carbon dioxide (IMAGE) University of Colorado at Boulder Caption Because infectious people exhale CO2 and viruses together, tracking carbon dioxide levels indoors is an inexpensive and powerful way to monitor the risk of people getting COVID-19, according to a new CU Boulder study. Credit Image courtesy of Spanish newspaper El Pais: https://tinyurl.com/c2jsb8r9 Usage Restrictions Image credit is required. 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.