Hydrogen ozonide () is a radical molecule consisting of a hydrogen atom covalently bonded to an ozonide unit.
It is possibly produced in the reaction of the hydroxyl radical with dioxygen: OH<sup>â¢</sup> + O<sub>2</sub> â HO<sub>3</sub><sup>â¢</sup>.
It has been detected in a mass spectrometer experiment using (protonated ozone) as precursor.