
I suppose the which-clause is a non-defining one, so it should have commas around it - I would suggest "mentioned" instead of "said": "... pollution, which was mentioned before, you ..." - I realize the sencond comma is there, but you forgot the first one - happens so easily - Buona giornata!

i changed it, thanks
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added by Guybrush88, July 10, 2013
edited by Guybrush88, July 12, 2013