The information in the CSI database comes from
 ship-owners who submit details of their fleet to the Index.
 They have completed a comprehensive questionnaire
covering the relevant environmental parameters.


Certificates will be issued to vessels that have been verified by a third party. Ship-owners can approach verification companies that have been accredited by the Clean Shipping Index; DNV GL, Bureau Veritas, Class NK, Lloyds Register, Korean Register, Rina Services and Verifavia.

The certificate is valid for at maximum 2,5 years plus or minus 6 months, following the regular class Inspection surveys. Emissions of CO2, SOx and Particulate Matter need to be verified annually by an office audit. Costs for certification are a matter between the ship operator and the classification company. If you would like to read about the detailed audit procedure, download our Verification guidelines.

Click here to download an example certificate