# The Lawnmowers (Harmonization of Noise Emission Standards) Regulations 1992, Paragraph 3.3: Surface sound pressure level LpAM


The surface sound pressure level LpAM is the root mean square of the sound pressures recorded on the measuring surface, calculated in accordance with the method set out in 8.4.

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Source: https://www.legislation.gov.uk/uksi/1992/168/schedule/3/paragraph/3.3 (the official version)
Page: https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992/schedule-3/paragraph-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.