It is important to note that marginal cost reflects the additional cost of one more ton of reductions, and not the total cost associated with each pollutant.
Marginal cost can be defined as the total cost that is associated with each pollutant. 
mnli hypothesis: Marginal cost can be defined as the total cost that is associated with each pollutant.  premise: It is important to note that marginal cost reflects the additional cost of one more ton of reductions, and not the total cost associated with each pollutant.