NOAA global marine-surface annual mean; parts per billion of dry air, 1984–2025.
Global atmospheric methane concentration is tracked from 1984 through 2025 using NOAA’s marine-surface annual mean. Values are dry-air mole fractions measured in parts per billion. The annual mean rises from 1,644.84 ppb in 1984 to 1,935.68 ppb in 2025. That is an increase of 290.84 ppb, or 17.7%, across the record.
Source 1: Global Annual Mean Methane
Publisher: NOAA Global Monitoring Laboratory
Dataset/table: Marine-surface annual mean concentration
Units: ppb
Date checked: 2026-07-17
Evidence: Provides the complete 1984–2025 global annual mean methane series.
The annual mean is a dry-air mole fraction based on NOAA’s global marine-surface network. Recent annual values may be revised.
Eight representative years trace the long-run path in the graphic, while the annual data table contains every NOAA observation from 1984 through 2025. Start, endpoint and change values are taken from that same annual series.
One NOAA Global Monitoring Laboratory series supplies every year with the same global averaging method and parts-per-billion unit.
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