Article 5
Noise indicators and their application 1. Member States shall apply the noise indicators Lden and Lnight as referred to in Annex I for the preparation and revision of strategic noise mapping in accordance with Article 7. Until the use of common assessment methods for the determination of Lden and Lnight is made obligatory, existing national noise indicators and related data may be used by Member States for this purpose and should be converted into the indicators mentioned above. These data must not be more than three years old. 2. Member States may use supplementary noise indicators for special cases such as those listed in Annex I(3). 3. For acoustical planning and noise zoning, Member States may use other noise indicators than Lden and Lnight. 4. No later than 18 July 2005, Member States shall communicate information to the Commission on any relevant limit values in force within their territories or under preparation, expressed in terms of Lden and Lnight and where appropriate, Lday and Levening, for road-traffic noise, rail-traffic noise, aircraft noise around airports and noise on industrial activity sites, together with explanations about the implementation of the limit values.