# The Control of Noise at Work Regulations (Northern Ireland) 2006, Paragraph 2

Extent: N.I.

If the work is such that the daily exposure consists of two or more periods with different sound levels, the daily personal noise exposure level (LEP,d ) for the combination of periods is ascertained using the formula:
LEP,d=10log10[1T0∑i=1i=n(Ti100.1(LAeq,T)i)] where—
n is the number of individual periods in the working day;
Ti is the duration of period i
(LAeq,T)i is the equivalent continuous A-weighted sound pressure level that represents the sound the person is exposed to during period i; and
∑i=li=nTi is equal to Te , the duration of the person’s working day, in seconds.

---
Source: https://www.legislation.gov.uk/nisr/2006/1/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/control-of-noise-at-work-regulations-northern-ireland-2006/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.