Hong Kong vs Tonga: Maritime transport CO2 emissions (experimental)
Maritime transport CO2 emissions (experimental) over time
- Hong Kong
- Tonga
How they compare
Hong Kong currently reports 5,669 Tonnes against 3,844 Tonnes in Tonga, a difference of 1,825 Tonnes.
That makes Hong Kong's figure about 1.5 times Tonga's.
Across all 6 years both countries report, Hong Kong has been ahead every year.
Hong Kong ranks 121st and Tonga ranks 124th of 138 countries.
Hong Kong has averaged higher in every one of the 2 decades both report.
Head to head by decade
| Decade | Hong Kong | Tonga | Difference | Ahead |
|---|---|---|---|---|
| 2010s | 64,679 Tonnes | 3,161 Tonnes | 61,518 Tonnes | Hong Kong |
| 2020s | 51,708 Tonnes | 4,490 Tonnes | 47,219 Tonnes | Hong Kong |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher maritime transport co2 emissions, Hong Kong or Tonga?
- Hong Kong, at 5,669 Tonnes against 3,844 Tonnes in Tonga as of 2025.
- What is the difference in maritime transport co2 emissions between Hong Kong and Tonga?
- 1,825 Tonnes, with Hong Kong ahead.
- How many years of comparable data are there for Hong Kong and Tonga?
- 6 years are reported by both, from 2019 to 2025.
- How do Hong Kong and Tonga rank globally for maritime transport co2 emissions?
- Hong Kong ranks 121st and Tonga ranks 124th of 138 countries.
- Where does this data come from?
- Organisation for Economic Co-operation and Development, published as Maritime transport CO2 emissions (experimental). Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
This experimental dataset includes annual, quarterly, and monthly information on carbon dioxide (CO2) emissions from maritime transport based on ship-tracking information collected via Automatic Identification System (AIS) transponders, covering all large vessels (above 300 gross tonnage) around the world, accessed via the United Nations Global Platform, from 2019 onwards. The CO2 emissions are estimated by the OECD, based on a consistent methodology across countries and include emissions from both domestic and international voyages. The CO2 emissions are classified using the ship-type classification used by the International Maritime Organisation (IMO) distinguishing between 19 vessel categories such as bulk carriers, tankers, and cruise ships. The database provides a measure of CO2 emissions on a territory basis for domestic navigation, which is used for reporting in the UN Framework Convention on Climate Change (UNFCCC) inventories; and also on a residence basis, which is used to estimate the emissions of maritime transport (H50 in the International Standard Industrial Classification of All Economic Activities, or ISIC) in the SEEA Air Emission Accounts (AEAs). Seven components of these CO2 emissions measures can be selected from the ‘Vessel emissions ’ filter. In the tables, these are also shown with the letters A, B, C, D, E, F and G. The aggregate measures of CO2 emissions are calculated as: Domestic navigation = A + C International navigation (memo item) = D + G Air emissions accounts: maritime transport (ISIC H50) = A + B + D + E + F For residence based measures, the allocation of emissions to countries is based on the residence of the companies that operate the ships. More information can be found on the dataset webpage