1. Official site of the Ministry of Natural Resources and Ecology of Kuzbass, Reports on the state and protection of the environment of the Kemerovo region–Kuzbass. http://kuzbasseco.ru/doklady/o-sostoyanii-okruzhayushhej-sredy-kemerovskoj-oblasti/. Cited July 26, 2021.
2. Official site of the Ministry of Ecology of the Chelyabinsk oblast, Reports on the ecological situation in the Chelyabinsk region. http://kuzbasseco.ru/doklady/o-sostoyanii-okruzhayushhej-sredy-kemerovskoj-oblasti/. Cited July 26, 2021.
3. Official site of the Ministry of Natural Resources and Ecology of the Sverdlovsk oblast, State report “On the state and protection of the environment of the Sverdlovsk oblast”. https://mprso.midural.ru/article/show/id/1126. Cited July 26, 2021.
4. Official site of the Ministry of Ecology and Rational Nature Management of the Krasnoyarsk krai, State reports “On the state and protection of the environment in Krasnoyarsk krai”. http://www.mpr.krskstate.ru/envir/page5849. Cited July 26, 2021.
5. Official site of the Department of Natural Resources and Environmental Protection of the Vologda oblast, Reports on the state and protection of the environment in the Vologda oblast. https://dpr.gov35.ru/deyatelnost/deyatelnost-strukturnykh-podrazdeleniy/sostoyanie-okruzhayushchey-sredy/. Cited July 26, 2021.