Sulphur Emissions Reduction Protocol
Sulphur Emissions Reduction Protocol is a protocol that aims at reducing the emission of Sulphur by at least 30%. It came into force in 1987 and had 22 parties. It was succeeded by another protocol in 1998 which aims to further reduce the Sulfur emissions. The new protocol has 23 parties. India is not a party.
Here is the Text of the Protocol