# The Control of Noise at Work Regulations 2005, Paragraph 1


The daily personal noise exposure level, LEP,d, which corresponds to LEX,8h defined in international standard ISO 1999: 1990 clause 3.6, is expressed in decibels and is ascertained using the formula:
where—
T e is the duration of the person's working day, in seconds;
T0 is 28,800 seconds (8 hours); and
L Aeq,Teis the equivalent continuous A-weighted sound pressure level, as defined in ISO 1999: 1990 clause 3.5, in decibels, that represents the sound the person is exposed to during the working day.

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Source: https://www.legislation.gov.uk/uksi/2005/1643/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/control-of-noise-at-work-regulations-2005/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.