Environment of East Kazakhstan: state and main directions of optimization Тurgai Alimbaev, Bibizhamal Omarova, Bibihadisha Abzhapparova, Kulpash Ilyassova, Kuralay Yermagambetova and Zhanna Mazhitova E3S Web Conf., 175 (2020) 14008 Published online: 29 June 2020 DOI: 10.1051/e3sconf/202017514008