Hong Kong Regulations
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FACTORIES AND INDUSTRIAL UNDERTAKINGS (NOISE AT WORK) REGULATION - SCHEDULE
SCHEDULE
[section 2]
DAILY PERSONAL NOISE EXPOSURE OF EMPLOYEES
The daily personal noise exposure (taking no account of the effect of using an ear protector) is expressed in dB(A) and is ascertained using the formula-
 |
|
｛ |
|
∫ |
|
[ |
|
2
] |
|
｝ |
| LEP,d |
|
1
To |
Te
O |
PA(t)
Po |
dt |
|
|
|
|
|
|
where-
L EP,d = level of daily personal noise exposure;
To = 8 hours or 28800 seconds;
Te = the duration (expressed in hours if To, is expressed in hours, and in seconds if To is expressed in seconds) of the person's personal to sound;
Po = 20 mPa; and
PA(t) = the time-varying value of A-weighted instantaneous sound pressure in pascals in the undisturbed field in air at the atmospheric pressure to which the person is exposed (in the locations occupied during the work day), or the pressure of the disturbed field adjacent to the person's head adjusted to provide a notional equivalent undisturbed field pressure.
(Enacted 1992)
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