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What does 'A' mean in Column 1 of the Hazardous Materials Table?

A The material is subject to the HMR only when offered or intended for transport by air unless it is a hazardous substance or hazardous waste.
Explaination
Column 1 tells which shipping mode(s) the entry affects and other information concerning the shipping description. Six different symbols may appear in Column 1 of the table. (A) Means the hazardous material described in Column 2 is subject to the HMR only when offered or intended for transport by air unless it is a hazardous substance or hazardous waste.
B The proper shipping name is appropriate for describing materials for domestic transportation, but may not be proper for international transportation.
C It shows the proper shipping name, hazard class, and packing group to use.