Feedstock Leak Could Delay Ozone Recovery by 7 Years
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- Montreal Protocol includes an exemption allowing ozone‑depleting substances to be used as feedstocks, originally assumed to leak only ~0.5% of the material.
- AGAGE monitoring shows actual feedstock leakage rates have risen to about 3.6% for many chemicals, far higher than original estimates.
- Nature Communications paper by MIT‑led researchers quantifies that at a 3.6% leakage rate, ozone recovery to 1980 levels is delayed from 2065/2066 to 2073, a seven‑year postponement.
- Stefan Reimann (Swiss Federal Laboratories for Materials Science and Technology) says tightening emissions from industrial feedstock processes is essential to preserve the Protocol’s success.
- Susan Solomon (MIT) calls the feedstock exemption a “bug in the system” and notes that thousands of alternative chemicals could replace the current feedstocks.
- Plastic production is projected to grow, making the reduction of feedstock leakage increasingly important for ozone recovery.
Why it matters: The seven‑year delay means additional exposure to harmful UV radiation for the global population, potentially increasing skin‑cancer incidence and other health impacts; the chemical industry and policymakers must act to cut feedstock emissions to preserve the Protocol’s health benefits.
