Daily Personal Exposure Level - LEP,d or LEX,8hr

The LEP,d is a worker's daily exposure to noise at work (normalised to an 8 hour day), taking into account the average levels of noise the time spent in each area. This is the parameter that is used by the Noise at Work Regulations and is essential in assessing a workers exposure and what action should be taken.

Noise Exposure Calculators

How to Get the LEP,d / LEX,8hr

It is not quite so daunting as it looks. The HSE book Guidance on the Noise at Work Regulations gives a good description of how to calculate the LEP,d. By far the easiest ways are:

• Using a Nomogram
• Using a computer program
• Using our online Noise Exposure Calculators

Despite first appearances, the nomogram method is quite simple. The sound level (usually A weighted Leq) is measured using a sound level meter. Using a ruler you make a line between the measured level and the time that the worker is exposed for. The LEP,d value is the point at which the line crosses the LEP,d bar. When a worker is going to be moving between different locations, a fractional exposure is obtained in a similar way at each location. The overall LEP,d can then be calculated.

Click for Example

The data logging instruments such as the CR812C and Pulsar 30 come with software that calculates the LEP,d for you. This is particularly useful when a worker is moving between different locations.

For workers moving between many locations it can be more convenient and often more accurate to use a noise dosemeter like the doseBadge. Dosemeters mount on the worker, measuring the noise exposure throughout the day and calculating to LEP,d for you.

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