Imminent Hazard 1 : An act or condition that is judged to present a danger to persons or property that is so urgent and severe that it requires immediate corrective or preventive action
NFPA 1521 Standard for Fire Department Safety Officer, 2002 ed. http://www.nfpa.org/assets/files/AboutTheCodes/152 1/1521-A2002-rop.pdf, (Std: Fr Dept Sf Officer - Amer) {400 NFC}