We report the visible light mediated synthesis of β chloro ketones from aryl cyclopropanes, oxygen, hydrochloric acid and nitric acid. The operationally simple and catalyst free method uses cheap standard lab reagents and displays a broad functional group tolerance. Moreover, scale up of the reaction and late stage functionalization of bioactive compounds is possible, providing the opportunity to utilize the cyclopropane ring as a masked β chloro ketone in a reaction sequence. We propose a light‐driven radical chain reaction initiated by the reaction of diluted hydrochloric and nitric acid producing small quantities of molecular chlorine. The mechanistic hypothesis is supported by 18O labelling and UV‐VIS experiments, cyclovoltammetry and several control reactions.