Hi chris1,
When you start a new game I think you can disable pollution.
Another way to disable pollution when you have already started a game could be to open the cheat menue and make a little modification, you should have a message warning you that the pollution feature will be disable, etc... do the said change, quit the cheat menue and you should now play without pollution unabled. Reload slic (just in case though I don't know if it will really have any effect) after this and it should be OK. Let me know if it works.
Try this map:
When you start a new game I think you can disable pollution.
Another way to disable pollution when you have already started a game could be to open the cheat menue and make a little modification, you should have a message warning you that the pollution feature will be disable, etc... do the said change, quit the cheat menue and you should now play without pollution unabled. Reload slic (just in case though I don't know if it will really have any effect) after this and it should be OK. Let me know if it works.

Try this map:
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