Research about “Harmonized gap-filled datasets from 20 urban flux tower sites” was published on 22 November 2022 in Earth System Science Data journal with the contribution of University of Reading (Mathew Lipson, Sue Grimmond), University of Freiburg (Andreas Christen) and Foundation for Research and Technology – Hellas (Nektarios Chrysoulakis) urbisphere members as well as other researchers. This article is part of the Volume 14, Issue 11 of the journal.