TY JOUR TI OCCUPATIONAL RISK ASSESSMENT FOR WORKERS AT CHEMICALLY HAZARDOUS SITES IN NITROGEN FERTILIZER PRODUCTION FACILITIES KW risk KW risk assessment KW chemically hazardous site KW hazardous chemical KW failure KW accident KW occupational sickness rate JO Problems of risk management in the technosphere AU Kudryavtsev, S.S. PY 2025 IS 2025 PB Saint-Petersburg University of State Fire Service of Emercom of Russia