a target value of 1 ng/m3 for benzo(a)pyrene, in relation to the BaP content in the PM10 fraction averaged over a calendar year, with which the Member States are to comply by means of practicable measures without incurring excessive costs. The measurement and monitoring of PAH in ambient air is mandatory;
une valeur cible de 1 ng de BaP/m³ dans l'air ambiant qu'il y a lieu de respecter dans la mesure du possible sans que cela n'entraîne des coûts excessifs.
