Global average atmospheric abundance of nitrous oxide 2001-2025, by month

Published by Ian Tiseo, Jun 6, 2025

Monthly mean atmospheric nitrous oxide (N₂O) concentrations reached a record high of 338.5 parts per million (ppm) in February 2025. This represents an increase of roughly seven percent when compared to average N₂O levels in January 2001. Globally-averaged annual atmospheric nitrous oxide concentrations reached a new record high in 2024. Nitrous oxide is a potent greenhouse gas with a global warming potential (GWP) 300 times greater than carbon dioxide.

Globally-averaged, monthly mean atmospheric nitrous oxide (N₂O) abundance from January 2001 to February 2025 (in parts per billion)

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Release date

2025

Region

Worldwide

Survey time period

January 2001 to February 2025

Supplementary notes

Atmospheric N₂O based on globally averaged marine surface data.
N₂O expressed as a mole fraction in dry air, nanomol/mol, abbreviated as ppb

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