120. In this Chapter:

F28[‘daily noise exposure level’ expressed as (LEX, 8h) (dB(A) re. 20Pa) means the timeweighted 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 (L_{EX, 8h}) means the time-weighted average of the daily noise exposure levels for a nominal week of five eight-hour working days as defined by international standard ISO 1999: 1990, point 3.6 (note 2).