Concepts and definitions

Key category

The category that is prioritised in the national inventory system because it has a significant influence on the country's total inventory of greenhouse gases in terms of absolute volume or trend of emissions, or both.

Methane (CH4)

Methane is generated when organic matter such as manure, waste water sludge or biodegradable waste is fermented under anaerobic conditions. Methane emissions from landfill sites are the most important single source of CH4.

Nitrous oxide (N2O)

Nitrous oxide is an ozone depleting substance. Despite its low emission volumes, its greenhouse gas impact is over 300 times bigger per unit weight than, for example, that of CO2. The most important sector causing N2O emissions is agriculture and more specifically soil emissions caused by nitrous fertilising.

Referencing instructions:

Official Statistics of Finland (OSF): Greenhouse gases [e-publication].
ISSN=1797-6065. Helsinki: Statistics Finland [referred: 16.10.2021].
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