The use of multi-model ensembles in atmospheric dispersion applications is becoming more and more popular. Methodologies for the combination of model results explored in the past are being adopted even in the operational or pre-operational contexts. However several questions remain unanswered like these relating to the way in which the ensemble should be set up. In other words, which criteria should be adopted to guarantee that the ensemble results will always be superior to those of any individual member? By means of mathematical formalism the paper tries to address this problem.
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