In this Chapter:
"daily noise exposure level" expressed as (LEX, 8h) (dB(A) re. 20μPa) means the time-weighted average of the noise exposure level for a nominal eight-hour working day as defined by international standard ISO (International Organization for Standardization) 1999: 1990, point 3.6, covering all noises present at work, including impulsive noise;
"exposure action values" mean the daily noise exposure level or peak sound pressure level which, if exceeded for any employee, requires specified action to be taken to reduce risk;
"exposure limit value" means the level of daily noise exposure or peak sound pressure which must not be exceeded for any employee;
"noise" means any audible sound;
"peak sound pressure" expressed as (p peak) means the maximum value of the "C"-frequency weighted instantaneous noise pressure;
"weekly noise exposure level" expressed as (LEX, 8h) means the time-weighted average of the daily noise exposure levels for a nominal week of five eight-ho
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