‘alert threshold’ shall mean a level beyond which there is a risk to human health from brief exposure for the population as a whole and at which immediate steps are to be taken by the Member States;
„häiretase” — tase, mille ületamisel kujutab lühiajaline kokkupuude saastatud õhuga ohtu inimeste tervisele ja mille puhul liikmesriigid peavad viivitamata meetmeid võtma;