HAZMAT Table 14b,,,,,,
"Hazardous Material Shipment Characteristics for Toxic by Inhalation (TIH): Percent of Total for 2002 and 1997
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"[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]
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Description,Value (percent),,Tons (percent),,Ton–miles (percent),
,2002,1997,2002,1997,2002,1997
Total,100.0,100.0,100.0,100.0,100.0,100.0
Toxic by Inhalation,1.1,1.4,1.2,1.3,2.0,3.5
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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.     
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NOTE:
Toxic by inhalation (TIH) gases and volatile liquids that are toxic when inhaled.",,,,,,
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SOURCE:
Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.      
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