Simulation Results (IMAGE) University of Bristol Caption These are simulation results showing long-lasting peak in ash concentration (red and orange colours) around 5 km height in the atmosphere, at the flight level of commercial aircraft. Credit University of Bristol 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.