HM has various meanings in the Transportation category. Discover the full forms, definitions, and usage contexts of HM in Transportation.
Any solid, liquid, or gas that can harm people, other living organisms, property, or the environment. It may be radioactive, flammable, explosive, toxic, corrosive, biohazardous, an oxidizer, an asphyxiant, a pathogen or an allergen.
TransportationLast updated: