No visible inhalation injury: no carbon deposits, erythema, edema, bronchorrhea, or obstruction0
Mild injury: minor or patchy erythema, carbon deposits, bronchorrhea, or mild bronchial obstruction+1
Moderate injury: moderate erythema, carbon deposits, bronchorrhea, or bronchial obstruction+2
Severe injury: severe inflammation with friability, copious carbon deposits, bronchorrhea, or obstruction+3
Massive injury: mucosal sloughing, necrosis, or endoluminal obstruction+4
