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Marine pollutants are hazardous materials that pose a threat to aquatic life. A severe marine pollutant is one that poses a more serious threat to aquatic life due to its concentration by weight.
Severe marine pollutants transported by water, in any size packaging, are subject to all the applicable requirements.
Marine pollutants transported by highway, rail, or air are subject to the requirements when transported in bulk packages.
The materials listed in Column 2 of the table in Appendix B to 172.101 have been identified by the International Maritime Organization (IMO) as environmentally hazardous or Marine Pollutants. Those considered most hazardous are designated as “Severe Marine Pollutants” and identified by the letters “PP” in Column 1.
Severe marine pollutants are subject to the regulations when in a mixture or solution and packaged in a concentration that equals or exceeds one percent by weight of the mixture or solution.
See Marine pollutant for more information on this topic.