TY JOUR TI USING GREEN ROOFS TO ENSURE ENVIRONMENTAL SAFETY IN THE URBAN AIR ENVIRONMENT KW ensuring the environmental safety of the urban air environment KW «green» roofs KW distribution of PM pollutants in the air KW solid suspended particles PM2.5 and PM10 KW methods for studying the composition of dust JO Problems of risk management in the technosphere AU Sysoeva, E.V. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia