The reason for the thick smoke observed from the flare-up of the refinery in Tehran on Sunday morning, following the observation of thick smoke from the flare-up of the refinery in Tehran, the public relations of this refinery announced that due to electrical and technical problems and in accordance with the safety and stability of the activity, the flame systems of the refinery were activated. The observed smoke is also related to the same safety process and emergency release of gases, and no fire occurred in the refining units. The conditions are under the control of the operational teams and the process is normalizing, no problems have arisen in the continuous fuel production process. Triggering a flare under such conditions is completely natural and part of the standard safety mechanisms of the oil refining industries.