You can change the pollution name...but I would change it in the 'labels.txt'. Are you aware of this method? View the file with notepad and look for the word....simple change it to whatever you want. There are alot of cool things to change in there, as well as in the game.txt. Hope that helps.
Anyway, thanks both You and Merc.
Of course, I have changed pollution to something else
in labels. And as long as I can remember, also in menu.
But it didn't work then too!
Perhaps I missed one pollution in menu or didn't move
the altered file to my scenario's folder...
I'll check it.
Changes in the Menu.txt will not always work. Great caution is required or else the scenario might crash. Tried it and speak form frustrating experience.