First aid for carbon dioxide poisoning begins with removing the patient from the poisoned environment, followed by measures including CPR and hyperbaric oxygen therapy as necessary. At the same time, call 120 to give specific information and request medical assistance. 1. Carbon dioxide poisoning patients should be quickly removed from the poisoned environment, if it is a closed environment, it should be ventilated as much as possible, if it is a closed environment and there is continuous carbon dioxide discharge, the rescuer should wear oxygen and mask and then enter the scene, and then transfer the patient to a safe area as soon as possible and then carry on the rescue treatment. 2. Pay attention to keep the respiratory tract of the poisoned person unobstructed, and inhale oxygen as soon as possible. 3. If the heart stops after getting out of the poisoned environment, the patient should be rescued immediately according to cardiopulmonary resuscitation. If the vital signs are stable, the patient should be given oxygen to keep the respiratory tract open and bed rest. If carbon dioxide poisoning occurs, go to the hospital in a timely manner, do not use your own medication, so as not to delay the time of rescue and increase the difficulty of treatment. Should strictly follow the physician’s medical advice, standardized treatment.