# The Mona Offshore Wind Farm Order 2025, Paragraph 17: Control of noise during operational stage

Extent: E+W

(1) The noise rating level for the operational lifetime of Work No. 22a must not exceed 34db at Tan y Bryn Uchaf (301667, 372765) at a position representative of the façade, in free-field conditions, of any building authorised or lawfully occupied for residential or accommodation purposes at the date of the granting of this Order.
(2) The noise levels set out in sub-paragraph (1) are to be measured—
(a) in accordance with British Standard BS4142:2014+A1:2019, methods for rating and assessing industrial and commercial sound; and
(b) with a microphone placed 1.5 metres above the ground in free-field conditions (being at least 3.5 metres from the nearest vertical reflecting surface).

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Source: https://www.legislation.gov.uk/uksi/2025/870/schedule/2/paragraph/17 (the official version)
Page: https://openlegislation.uk/mona-offshore-wind-farm-order-2025/schedule-2/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.