In accordance with the law of the Russian Federation, no residential buildings, including standalone residential buildings, landscape and recreation zones, recreation areas, resort areas, etc. shall be placed within the boundaries of control zones established at the Group's production facilities. Within the limits of the control zones and beyond, the levels of physical and chemical exposure comply with the approved standards. The level of noise exposure at the border of the controlled zone is monitored on an annual basis.
To reduce the noise exposure of the environment and nearby residential areas, the Group's facilities undertake to implement and reconstruct the silencers. Sources of noise exposure can be air intakes of blowers, mouths of chimneys, compressor rooms, as well as the steam discharged when the boilers perform shutting down or start-up operations, etc. The assessment of noise exposure of the environment and applicable protection measures are defined at the design stage. The protective measures are implemented during the construction or modernization of production assets.