Environmental problems in the transportation of petroleum products in Kazakhstan Railya Mukhamadeyeva, Ondassyn Orazov, Saule Mazhikeyeva, Omirzhan Seilkhan, Alma Kenzhebayeva, Saltanat Urazbayeva, Kuralay Kassymzhanova, Maratbekovich Islamkhan and Aigerim Sharipova E3S Web of Conf., 402 (2023) 01020 Published online: 19 July 2023 DOI: 10.1051/e3sconf/202340201020