However, in order to distinguish such engines from engines which are subject to those emission limits, markings should be required in certain cases.
Mar sin féin, d'fhonn innill den sórt sin a idirdhealú ó innill atá faoi réir na dteorainneacha astaíochtaí, ba cheart go mbeadh marcálacha riachtanach i gcásanna áirithe.