Trichloroisocyanuric acid (TCCA) is a commonly used disinfectant that releases chlorine gas when it comes into contact with water. Inhalation of this gas can lead to severe damage to the airways and the development of acute respiratory distress syndrome (ARDS). The described case of a 49-year-old man developed ARDS accompanied by shortness of breath, cough and hypoxia after inhalation of chlorine gas. The patient was treated with non-invasive mechanical ventilation and gradual administration of corticosteroids, which led to an improvement in his condition. During treatment, he developed a secondary pulmonary infection caused by Candida albicans, which was successfully treated with fluconazole and antibiotics. The patient recovered and was discharged after 51 days of hospitalization without further complications. This case highlights the importance of rapid diagnosis and combined treatment of chlorine-induced ARDS, including corticosteroids and noninvasive ventilation[1].