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Early in the summer, A carbon monoxide poisoning accident occurred inside the car that was stopped on the shoulder of the road. The windows were closed and the air conditioning was turned on. All five passengers was unconscious. Their blood carbon monoxide-hemoglobin(CO-Hb) content was 31.0 %~ 39.5 % range. If they were a little more exposure to carbon monoxide, All of them would have died. The carbon monoxide concentrations were measured in the indoor 0.073 % and in the trunk 0.136 %. The concentration was higher in the trunk than indoor. The exhaust gas pipe was bent to the inside of the rear bumper due to an accident. The car's exhaust gases does not spread into the air, and spread to the inside of bumper. The air passage in the trunk is damaged, the exhaust gas flow in easily, and spread into the indoor.