Due to the transboundary nature of mercury pollution, between 40 % and 80 % of total mercury deposition in the Union originates from outside the Union.
Mar gheall ar nádúr trasteorann an truaillithe mearcair, tagann idir 40 % agus 80 % d'iomlán dheascadh an mhearcair san Aontas isteach san Aontas ón taobh amuigh.