The Hazard Characteristic Code (HCC) designation for DOT Poison-Inhalation Hazard. Hazard Group & Comments: A material, other than a poisonous gas (HCC G1), meeting the definition of UN Class 6.1 (Poisonous Material) under 49 CFR173.132 (a) (1) (iii) and assigned to Hazard Zone A or B in accordance with 49 CFR 173.133(a) and required to be marked or labeled "Inhalation Hazard" under 49 CFR 172.313 or 49 CFR 172.416 or 49 CFR 172.429