Examine the role of long-term high-altitude atmospheric observatories in supporting global environmental governance.

Environmental treaties set targets on paper; atmospheric observatories check them in the air. Article 3 of the Vienna Convention (1985) asks parties to set up "systematic observation of the state of the ozone layer" [1]. High-altitude background stations such as Switzerland's Jungfraujoch (~3,580 m) sit above local pollution and record the baseline atmosphere [3]. They are part of the evidence base of global governance, though they have limits.

Role in supporting governance

• Setting baselines and detecting trends: Jungfraujoch's infrared solar spectra from 1951 and 1984–92 showed N₂O close to pre-industrial levels until about 1951 and rising faster afterwards [3]. Such evidence feeds climate assessments.
• Checking treaty compliance independently: after 2012, CFC-11 declined more slowly than expected. AGAGE observations traced about 7 Gg/year of extra emissions to eastern China (Shandong, Hebei), at least 40–60% of the global rise [5]. Countries' own reports had missed this.
• Showing that enforcement worked: after action was taken, eastern China's emissions fell back to pre-2013 levels by 2019. This probably prevented a substantial delay in ozone-layer recovery [6].
• Building cooperative networks: AGAGE and its predecessors have measured continuously since 1978, and Jungfraujoch joined in 2000 [4]. Its NDACC instruments (FTIR, and SAOZ since 1990) track stratospheric change [2]. The shared data works as a global public good.

Limitations

• Spatial blind spots: stations can only trace emissions from nearby regions. The CFC-11 study could not rule out emissions from regions with few measurements [5].
• Fragile continuity: Jungfraujoch's infrared record has a 33-year gap [3]. Each instrument change (in 2024 a new Bruker 125HR replaced a 120HR used since 1994 [2]) has to be cross-calibrated, or the record will show false jumps.
• Funding mismatch: a useful trend needs decades of steady funding, but research grants run for a few years. The data also only points to a source; it has no enforcement power.

Long-term observatories turn treaty commitments into figures that can be checked, as the CFC-11 episode showed. The way forward is to place stations where coverage is thin, including in South Asia and the Himalaya, and to fund them for the long term. India can use such data to verify its Kigali Amendment HFC phase-down independently. This would strengthen evidence-based multilateralism under SDG 13 and SDG 17.