KEY:
– Represents an estimate equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of highly sampling
variability or poor response quality.
NOTE:
Note: Packing Groups I, II, and III reflect the level of hazard associated
with the material being shipped. Packing Group I is the most rigorous.
SOURCE:
Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002
Commodity Flow Survey, Hazmat Data, December 2004.