TY JOUR TI TECHNOGENIC FIRES IN COAL MINING AS SOURCES OF ENVIRONMENTAL RISK KW coal mining KW hard and brown coals KW endogenous fires KW fine suspended particles KW aerosols KW smoke-forming capacity KW black carbon KW soot KW environmental risks JO Problems of risk management in the technosphere AU Timofeeva, S.S. AU Smirnov, G.I. AU Zueva, V.A. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia