This database includes annual, quarterly and monthly information on CO2 emissions from maritime transport based on ship-tracking information collected via the Automatic Indentification System (AIS). These CO2 emissions are estimated by the OECD, based on a consistent methodology across countries.

SDD.SEEA@oecd.org

The main source used for the estimation of these CO2 emissions is Automatic Indentification System (AIS) ship-tracking data, accessed via United Nations Global Platform, which covers all large vessels (above 300 gross tonnage) around the world. For each vessel, this database includes data collected from location tracking devices, some other dynamic variables on the ship's activity, as well as a unique identifier that can be used to link with other sources of information on the vessel characteristics, including the vessel's technical specifications and information about the company operating the vessel (operator). Other key sources of inputs for the estimation model are results from the monitoring, reporting and verification system for CO2 emissions from ships of the European Union (EU-MRV) and information published by the IMO in the Fourth IMO Greenhouse Gas Study 2020. A complete description of the estimation methodology is provided in the forthcoming OECD Working Paper.

SDD.SEEA@oecd.org

November 2023

This database is updated by the end of the first month of each quarter with new data from the previous quarter. Revisions, where applicable, are made at these same quarterly intervals.

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The estimates include all vessel activitity covered by AIS, as much as feasible. In most cases, the primary activity of the vessel operators is classified in national accounts in alignment with ISIC H50 - Water Transport Services in the International Standard Industrial Classification of All Economic Activities (ISIC) Revision 4. However, in some cases, vessel operators may have a different primary economic activity for recording production, value added, and other economic variables, particularly logistics (H52) or oil and gas exploration and extraction (B06). The emissions should be recorded accoding to the operator's primary activity in the national Air Emission Accounts (AEAs). The estimates include emissions from both domestic and international voyages.

Vessels covered by AIS are classified using the ship-type clasification used by the International Maritime Organisation (IMO), including in the Fourth IMO Greenhouse Gas Study 2020. Allocation to countries is based on the residence of the companies that operate the ships. Vessel-level emissions estimates are linked to information on operators and aggregated for all countries or territories represented in the estimates. Note that aggregated estimates for overseas territories are treated separately and excluded from national totals except for cases where territories are included as part of official national accounts.