Safety processes, the reason for the observation of thick smoke from the ignition of the refinery in Tehran Oil refinery in Tehran: The smoke observed in the refinery space was caused by the activation of ignition systems following the occurrence of electrical and technical problems and in order to comply with safety instructions and evacuation of gases in an emergency. No fire occurred in the refining units. The situation is under the control of the operational teams and the necessary measures are being taken to return the systems to a normal state. There was no interruption in the production process and continuous supply of petroleum products and fuel production continues without interruption. Rank in social networks.