Hong Kong's Orient Overseas Container Line (OOCL) says it has once again attained certification on the integrity and disclosure of its 2012 environmental data by adopting Clean Shipping Index (CSI) verification standards. OOCL was accredited the Verification Certification after an audit conducted by DNV GL by using an internationally recognized and accepted verification guideline to check OOCL vessels on a wide variety of scoring parameters, including emissions of carbon dioxide, sulphur oxides, nitrogen oxides and particulate matter, wastes handling, chemicals usage, and wastewater control.