I've noticed that in recent years a new acronym PCF has been referred to and it has come over from North America. PCF stands for Processed Chlorine Free. The term is used to describe papers made using some portion of recycled content (minimum 30%) which meets EPA (Environmental Protection Agency) guidelines. An important point is that PCF papers have not been re-bleached with chlorine containing compounds, but it is unknown if the recycled content was bleached with chlorine or chlorine compounds. You can read more here: www.chlorinefreeproducts.org
As far as I am aware, there are no PCF accredited products available in Europe.
If you are interested in this subject, there's a great book titled: 'Paper Trails - From Trees to Trash, the true cost of paper' by Mandy Haggith. This not only covers forestry but also the bleaching angle.