S138 — The NOAA Ozone Depleting Gas Index: Guiding Recovery of the Ozone Layer

NOAA Global Monitoring Laboratory (2024)

Open original source — gml.noaa.gov

official atmospheric monitoring index environmental_outcome_monitoring

Curated public use: Use for the atmospheric halogen pressure trajectory; do not present the index as an ozone-recovery percentage.

Limitation: Source cards are evidence anchors, not proof that a linked claim is settled.

Source note: Reports the 2024 reactive-halogen trajectory toward the 1980 benchmark; the index is not a percentage measure of ozone-layer recovery.