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Chemical pneumonitis in a 9-year-old following chlorine gas exposure. A previously fit and well 9-year-old boy developed shortness of breath and chest pain after playing with friends on a building site where bonfire materials were being collected. Firstline investigations failed to explain his symptoms, which worsened over the next 24 hours, necessitating endotracheal intubation and mechanical ventilation. When public health and the police retraced his steps, they found barrels of sodium hypochlorite and red diesel at the bonfire site, which when mixed had the potential to form chlorine gas leading to the diagnosis of a chemical pneumonitis secondary to chlorine gas inhalation. Supportive care was continued, and he was successfully extubated after 48 hours. At 6-week follow-up, he had no ongoing pulmonary symptoms.