Treatment of over 16,000 vehicles emitting smoke in Tehran.
Lt. Col. Firoz Kashir, explaining the steps taken by the traffic police to reduce air pollution and organize traffic in the capital city, said: "The technical inspection is a tool to help the environment, regardless of whether all vehicles must receive it." New vehicles that burn gasoline up to four years and new diesel vehicles whose fuel is diesel fuel up to two years do not need to receive a technical inspection certificate; But all drivers must pass a periodic inspection of their vehicles.