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Type A : elles représentent l\u2019exposition aux différentes sources de bruit. Elles sont à donner pour les indicateurs Lden et pour le Ln.<\/SPAN><\/P>

Type B : elles représentent les secteurs affectés par le bruit. Ces secteurs sont liés au classement sonore des voies routières et ferroviaires.<\/SPAN><\/P>

Type C : ce sont les cartes des dépassements des valeurs limites réglementaires, pour les indicateurs Lden et Ln. <\/SPAN><\/P>

Lden : Niveau journalier pondéré<\/SPAN><\/P>

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