1985 Helsinki Protocol on the Reduction of Sulphur Emissions

The Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution on the Reduction of Sulphur Emissions or their Transboundary Fluxes by at least 30 per cent is a 1985 protocol to the Convention on Long-Range Transboundary Air Pollution agreement that provided for a 30 per cent reduction in sulphur emissions or transboundary fluxes by 1993. The protocol has been supplemented by the 1994 Oslo Protocol on Further Reduction of Sulphur Emissions.

Source: Wikipedia — 1985 Helsinki Protocol on the Reduction of Sulphur Emissions (CC BY-SA 4.0)