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

31 years are reported by both, from 1993 to 2023.

Where does this data come from?

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

Portugal vs Slovakia: Methane (CH4) emissions from Waste (Mt CO2e), per square kilometre

Portugal

0.0001 Mt CO2e per square kilometre

in 2023

Slovakia

0.0001 Mt CO2e per square kilometre

in 2023

Portugal rank

40th

Slovakia rank

39th

Methane (CH4) emissions from Waste (Mt CO2e), per square kilometre over time

Portugal
Slovakia

How they compare

Slovakia currently reports 0.0001 Mt CO2e per square kilometre against 0.0001 Mt CO2e per square kilometre in Portugal, a difference of 0 Mt CO2e per square kilometre.

The two have swapped places 1 time across 31 shared years of data; in 1993 it was Portugal ahead.

Portugal ranks 40th and Slovakia ranks 39th of 203 countries.

Across the 4 decades both report, Portugal averaged higher in 3 and Slovakia in 1.

Head to head by decade

Decade	Portugal	Slovakia	Difference	Ahead
1990s	0.0001 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2000s	0.0001 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2010s	0.0001 Mt CO2e per square kilometre	0.0001 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Portugal
2020s	0.0001 Mt CO2e per square kilometre	0.0001 Mt CO2e per square kilometre	0 Mt CO2e per square kilometre	Slovakia

Averages of every year both report within each decade.

Frequently asked questions

Which has higher methane (ch4) emissions from waste (mt co2e), per square kilometre, Portugal or Slovakia?: Slovakia, at 0.0001 Mt CO2e per square kilometre against 0.0001 Mt CO2e per square kilometre in Portugal as of 2023.
What is the difference in methane (ch4) emissions from waste (mt co2e), per square kilometre between Portugal and Slovakia?: 0 Mt CO2e per square kilometre, with Slovakia ahead.
How many years of comparable data are there for Portugal and Slovakia?: 31 years are reported by both, from 1993 to 2023.
How do Portugal and Slovakia rank globally for methane (ch4) emissions from waste (mt co2e), per square kilometre?: Portugal ranks 40th and Slovakia ranks 39th of 203 countries.
Where does this data come from?: Statizoid (derived), published as Methane (CH4) emissions from Waste (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 Slovakia: Methane (CH4) emissions from Waste (Mt CO2e), per square kilometre. Statizoid, drawing on Statizoid (derived). Retrieved 21 September 2026, from https://environment.statizoid.com/compare/methane-ch4-emissions-from-waste-mt-co2e-per-square-kilometre/portugal/slovak-republic/

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<a href="https://environment.statizoid.com/compare/methane-ch4-emissions-from-waste-mt-co2e-per-square-kilometre/portugal/slovak-republic/">Portugal vs Slovakia: Methane (CH4) emissions from Waste (Mt CO2e), per square kilometre</a> — Statizoid

About this data

Indicator: Methane (CH4) emissions from Waste (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: 250 places, 12,804 data points, 1970–2023
Last refreshed: 21 September 2026

Methane (CH4) emissions from Waste (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.