Table 2c. Hazardous Material Shipment Characteristics by Hazard Class for the United States: Percentage of Total for 2012 and 2007
(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys. Because of rounding, estimates may not be additive)
| Hazard class and description | Value | Tons | Ton-miles (1) | |||
|---|---|---|---|---|---|---|
| 2012 | 2007 | 2012 | 2007 | 2012 | 2007 | |
| Total | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Class 1, Explosives | 0.8 | 0.8 | 0.2 | 0.1 | 0.3 | 0.3 |
| Class 2, Gases | 5.4 | 9.1 | 6.4 | 11.2 | 10.8 | 17.1 |
| Class 3, Flammable and combustible liquid | 86.4 | 80.8 | 85.4 | 78.6 | 66.5 | 56.1 |
| Class 4, Flammable solid; spontaneously combustible material; dangerous when wet material | 0.2 | 0.3 | 0.4 | 0.9 | 1.9 | 1.7 |
| Class 5, Oxidizers and organic peroxides | 0.3 | 0.5 | 0.5 | 0.7 | 1.8 | 2.2 |
| Class 6, Toxic materials and infectious substances | 0.7 | 1.5 | 0.3 | 0.5 | 1.2 | 1.8 |
| Class 7, Radioactive material | 0.5 | 1.4 | S | Z | Z | Z |
| Class 8, Corrosive material | 3.2 | 3.6 | 4.9 | 5.1 | 12.3 | 13.7 |
| Class 9, Miscellaneous hazardous material | 2.5 | 2.1 | 2.0 | 2.8 | 5.2 | 7.1 |
KEY: S = Withheld because estimate did not meet publication standards.
Z = Rounds to zero.
(1) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.
NOTES: Value-of-shipments estimates have not been adjusted for price changes. Appendix B tables provide estimated measures of sampling variability. The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design and definitions. Links to this information on the Internet may be found at <www.census.gov/econ/cfs>.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.