Hawaii CO₂ Emissions
Hawaii emitted 18 million metric tons of energy-related CO₂ in 2024, 0.4% of the US total. That ranks it 44th among the 50 states and the District of Columbia, at 12.5 metric tons per person.
Data year 2024 · Source: U.S. Energy Information Administration, State Energy Data System (June 2026)
How much CO₂ does Hawaii emit?
Hawaii produced 18 million metric tons of carbon dioxide from burning fossil fuels in 2024. The United States as a whole emitted 4.78 billion metric tons, so Hawaii accounts for 0.4% of the national total.
Per person, that is 12.5 metric tons, close to the US average of 14.1 metric tons. On that measure Hawaii ranks 30th highest of 51.
CO₂ emissions in Hawaii since 1990
Energy-related emissions in Hawaii have fallen by 15% since 1990, from 21 million metric tons to 18 million metric tons. Compared with 2005, the baseline year for many US climate targets and marked on the chart, they have fallen by 22%. Emissions peaked in 2007 at 24 million metric tons and are now 25% below that level.
Emissions by sector
Transportation is the largest source of energy-related CO₂ in Hawaii, at about 63% of the total, followed by electric power at 30% and industrial at 5%.
Emissions by fuel
Petroleum produces about 100% of the state’s energy-related CO₂, natural gas 0%.
How Hawaii compares with other states
These are the states closest to Hawaii in the 2024 ranking by total emissions. See the full ranking of all states.
| # | State | Total (Mt) | Share of US | Per person (t) |
|---|---|---|---|---|
| 42 | Montana | 27.16 | 0.6% | 23.9 |
| 43 | Idaho | 21.11 | 0.4% | 10.5 |
| 44 | Hawaii | 17.95 | 0.4% | 12.5 |
| 45 | Maine | 15.99 | 0.3% | 11.4 |
| 46 | South Dakota | 15.11 | 0.3% | 16.3 |
Frequently asked questions
How much CO₂ does Hawaii emit per year?
Hawaii emitted 18 million metric tons of energy-related CO₂ in 2024, which is 0.4% of the US total of 4.78 billion metric tons.
What are the CO₂ emissions per person in Hawaii?
About 12.5 metric tons per person in 2024, close to the US average of 14.1 metric tons. That ranks 30th highest of 51.
Have emissions in Hawaii fallen since 2005?
They have fallen by 22% since 2005 and fallen by 15% since 1990. Emissions peaked in 2007 at 24 million metric tons and are now 25% below that level.
What is the biggest source of CO₂ in Hawaii?
Transportation is the largest sector, at about 63% of energy-related emissions, followed by electric power at 30%. By fuel, petroleum accounts for 100%.
About the data. Figures are energy-related carbon dioxide emissions: CO₂ from burning coal, natural gas and petroleum, in million metric tons. Emissions from power plants are counted in the state where the electricity is generated, not where it is used. Other greenhouse gases and non-energy sources such as agriculture are not included.
Source: U.S. Energy Information Administration, State Energy Data System, released June 26, 2026. Latest year available: 2024.
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