[3] The convention has not entered into force due to signatory states not meeting the ratification requirements.
Canada, France, Germany, Greece, the Netherlands, Norway, and Turkey signed the 2010 protocol to the convention.
The protocol was designed to overcome some implementation problems that had discouraged states from ratifying the original convention.
For example, the substances listed under International Maritime Dangerous Goods Code are considered HNS.
[9][15] The HNS convention establishes a two-tier system for compensation in the event of accidents at sea involving hazardous and noxious substances.
Companies that import hazardous and noxious substances in member states of the convention will be required to contribute to this fund.