This page contains some items related to a presentation by Helge R. Olesen at the 15th International conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes  (Madrid, Spain, May 6.9, 2013).

• The Delta Tool web site is http://aqm.jrc.ec.europa.eu/DELTA/
• John Irwin's web site called Atmospheric Transport and Diffusion Archive has a section on model evaluation, which contains interesting material.

A video was shown illustrating what stability means to dispersion. This video is available through the link http://envs.au.dk/borex