Prior to 1 January 2012 it is 4. 5% m/m (measurement by mass). On and after 1 January 2012 it is 3. 5% m/m and; and on and after 1 January 2020 it is 0. 5% m/m. (Reg. 14. 1) This limit is sometimes called the “global sulphur cap”.
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