Environment of East Kazakhstan: state and main directions of optimizationТurgai Alimbaev, Bibizhamal Omarova, Bibihadisha Abzhapparova, Kulpash Ilyassova, Kuralay Yermagambetova and Zhanna MazhitovaE3S Web Conf., 175 (2020) 14008DOI: https://doi.org/10.1051/e3sconf/202017514008