How many years of comparable data are there for Portugal and Tonga?

54 years are reported by both, from 1970 to 2023.

Where does this data come from?

Statizoid (derived), published as Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square kilometre. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Portugal vs Tonga: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square

Portugal

0 Mt CO2e per square kilometre

in 2023

Tonga

0 Mt CO2e per square kilometre

in 2023

Portugal rank

82nd

Tonga rank

85th

Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square over time

Portugal
Tonga

How they compare

Portugal currently reports 0 Mt CO2e per square kilometre against 0 Mt CO2e per square kilometre in Tonga, a difference of 0 Mt CO2e per square kilometre.

That makes Portugal's figure about 1.1 times Tonga's.

The two have swapped places 2 times across 54 shared years of data; in 1970 it was Portugal ahead.

Portugal ranks 82nd and Tonga ranks 85th of 194 countries.

Across the 6 decades both report, Portugal averaged higher in 5 and Tonga in 1.

Head to head by decade

Decade	Portugal	Tonga	Difference	Ahead
1970s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
1980s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
1990s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2000s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2010s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2020s	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Tonga

Averages of every year both report within each decade.

Frequently asked questions

Which has higher methane (ch4) emissions from transport (energy) (mt co2e), per square, Portugal or Tonga?: Portugal, at 0 Mt CO2e per square kilometre against 0 Mt CO2e per square kilometre in Tonga as of 2023.
What is the difference in methane (ch4) emissions from transport (energy) (mt co2e), per square between Portugal and Tonga?: 0 Mt CO2e per square kilometre, with Portugal ahead.
How many years of comparable data are there for Portugal and Tonga?: 54 years are reported by both, from 1970 to 2023.
How do Portugal and Tonga rank globally for methane (ch4) emissions from transport (energy) (mt co2e), per square?: Portugal ranks 82nd and Tonga ranks 85th of 194 countries.
Where does this data come from?: Statizoid (derived), published as Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square kilometre. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Portugal vs Tonga: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square. Statizoid, drawing on Statizoid (derived). Retrieved 21 September 2026, from https://environment.statizoid.com/compare/methane-ch4-emissions-from-transport-energy-mt-co2e-per-square-kilometre/portugal/tonga/

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<a href="https://environment.statizoid.com/compare/methane-ch4-emissions-from-transport-energy-mt-co2e-per-square-kilometre/portugal/tonga/">Portugal vs Tonga: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square</a> — Statizoid

About this data

Indicator: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per square kilometre
Unit: Mt CO2e per square kilometre
Source: Statizoid (derived)
Licence: Derived by Statizoid from the sources named on the page
Coverage: 241 places, 12,381 data points, 1970–2023
Last refreshed: 21 September 2026

Methane (CH4) emissions from Transport (Energy) (Mt CO2e) divided by Land area (sq. km), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.