Collaborated with Ivan Smiljanic, EUMETSAT, with VIIRS imagery of ‘industrial trails’ west of Melbourne, Australia on 5 April 2021. Ivan has included the event on their study of ‘industrial trails’ over Europe: https://www.eumetsat.int/ship-trails-industrial-plumes. Also, provided Ivan an example of ‘volcano trails’ per his request. An example from VIIRS at 05:15:27 UTC 14 April 2021 of the volcano over western Iceland is shown in the figure. (POC: Lewis Grasso, CIRA: Lewis.Grasso@colostate.edu, Don.Hillger@noaa.gov) Funding: JPSS