1994 Oslo Protocol on Further Reduction of Sulphur Emissions
The Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution on Further Reduction of Sulphur Emissions is an agreement to provide for a further reduction in sulphur emissions or transboundary fluxes. It is a protocol to the Convention on Long-Range Transboundary Air Pollution and supplements the 1985 Helsinki Protocol on the Reduction of Sulphur Emissions.
Source: Wikipedia — 1994 Oslo Protocol on Further Reduction of Sulphur Emissions (CC BY-SA 4.0)