<prompt> Translate the following text to EnglishGharama ya mwisho ya kupunguza SO2 na NOx hadi 2015 ni chini ya 450 na 2,300 kwa tani, kwa mtiririko huo, katika hali zote nne za kupunguza uzalishaji.  <response>: The marginal cost of SO2 and NOx reductions through 2015 are less than 450 and 2,300ton, respectively, in all four multi-emissions reduction scenarios. 