At 11:00 on December 24 the message that in 09:37 24.12.2018 there was poisoning with carbon monoxide of 4 people, from them 2 children came to ODS FKU "CCCS of the Ministry of Emergency Situations of Russia of the Republic of Tatarstan" from the senior emergency doctor of Kazan. The preliminary cause of the accident – independent overlapping by hosts of an air vent the sheet of paper.