UN 3478 and UN 3479 refer to fuel cell cartridges.

• A. UN 1950, aerosols
• B. UN 2037, gas cartridges
• C. UN 3478 and UN 3479, fuel cell cartridges
• D. UN 3479, separate

Answer: (C)

UN numbers identify dangerous goods, and sometimes the same item is covered by more than one number to account for different forms or contents. For fuel cell cartridges used in devices, there are two specific UN numbers—3478 and 3479—that apply to the same category of item. This means both designations can appear together to describe the fuel cell cartridge shipments, covering the slight variations in their packaging or contents. That’s why the statement that UN 3478 and UN 3479 refer to fuel cell cartridges is the best fit. The other options point to different UN numbers for aerosols or gas cartridges, which do not describe this item, and claiming only one UN number would miss the dual designation that exists for fuel cell cartridges.