The European Food Safety Authority (EFSA) was asked by the European Commission to provide scientific assistance with respect to the evaluation of applications received by the European Commission concerning basic substances. In this context, EFSA’s scientific views on the specific points raised during the commenting phase conducted with Member States and EFSA on the basic substance application for ozone are presented. The context of the evaluation was that required by the European Commission in accordance with Article 23 of Regulation (EC) No 1107/2009 following the submission of applications for approval of ozone as a basic substance to be used in plant protection as a bactericide, fungicide, insecticide, nematicide and viricide. The current report summarises the outcome of the consultation process organised by EFSA and presents EFSA’s scientific views on the individual comments received.