Sox and nox ? how to control the same ? MARPOL which annex ?

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FOLLOW

SOx (oxides of sulphur) in ships' exhaust are controlled by controlling the sulphur content in the fuels. The current suphur cap is 4.5% and IMO is looking to reduce it gradually to 0.5% by the year 2020. In SECA areas it is presently 1% and is planned to be reduced to 0.1% by 2015.
The control of NOx is taken care of while designing the engine.

Both are governed by Marpol annex VI