Workers in the Municipality of Tehran expose to high level of noises. The major sources of noise are the vehicles for garbage collection, Asphalt production and its usage in construction of pavements, Repairing motor vehicles, technical and constructive implementation including road and building construction , Forging, Concrete planning, Welding, Building structure and  etc.Although most of such activities are performed by Contractors, many workers are exposed to high levels of noise during such processes. Since hearing conservation program is a duty for the Municipality, we have managed to use some new protocols to prepare a convenient and quiet environment for workers that is going to be discussed here in the present article