Again, that is not something that we have done. However, you are referring to something that relates more closely to our well-being than to economic costs. There are models that allow for that type of calculation. There are, no doubt, people who would feel that a clean environment and clean air represent a benefit. It is something that cannot be easily observed.
We must realize that this concept goes beyond economic costs. It involves taking into account a whole host of factors that enhance our well-being.