# The Aerodromes (Noise Restrictions) (Rules and Procedures) Regulations 2003, Paragraph 4.2


The assessment of noise exposure (i.e. establishment of noise contours and number of people affected) shall be carried out using at least the common noise indicators Lden and Lnight, where available.

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Source: https://www.legislation.gov.uk/uksi/2003/1742/schedule/2/paragraph/4n3 (the official version)
Page: https://openlegislation.uk/aerodromes-noise-restrictions-rules-and-procedures-regulations-2003/schedule-2/paragraph-4n3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.