If you see a green diamond with the number 1005 on a transportation vehicle, what is likely inside the tank?

The green diamond with the number 1005 indicates that the vehicle is transporting ammonia, which is a colorless gas with a distinct, pungent smell. The proper classification number for ammonia is indeed 1005, as set by the U.S. Department of Transportation's Hazardous Materials Table. This number helps first responders and others identify the potential hazards associated with the substance in the event of an accident or leak.

Other options feature substances with different identification numbers and classifications, such as propane and natural gas, which do not match the identifier 1005. Recognizing these codes is crucial for safety and emergency response, ensuring that the appropriate handling and safety measures can be taken when dealing with the specific substances transported in such vehicles.