Daily noise exposure L(EX,8h) = L + 10·log₁₀(T/8) It is normalized to 8 hours. For example, 4 hours of work at 90 dB(A) means ≈ 87 dB(A) exposure. Action values: lower 80, upper 85, limit 87 dB(A).

L(EX,8h) = L + 10·log₁₀(T / 8) [dB(A)]
Example calculation: 4 hours in a 90 dB(A) environment → LEX,8h = 90 + 10·log(4/8) ≈ 87 dB(A) → exposure limit value; technical measures + PPE are mandatory.

Daily Noise Exposure (LEX, 8h)

Calculate the daily noise exposure, normalized to 8 hours, from the measured noise level and exposure time, and compare it to the action values.

LEX, 8h
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Notes: LEX, 8h = L + 10·log₁₀(T/8). Action values (Regulation on the Protection of Workers from Risks Related to Noise / 2003/10/EC): lower action 80, upper action 85, exposure limit value 87 dB(A) (The limit value applies to the ear, including PPE). This is for a single noise source; a combined calculation is required for different levels.
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How is it calculated?

  1. Enter the measured noise level (dB(A)).
  2. Enter the exposure time (in hours).
  3. Press Calculate; the normalized exposure and action value status will be displayed.

Frequently Asked Questions

What is the noise exposure limit in dB?
According to the legislation on the protection of workers from noise (2003/10/EC): lower action value 80, upper action value 85, exposure limit value 87 dB(A).
What happens if 85 dB(A) is exceeded?
The use of ear protection becomes mandatory, hearing tests (audiometry) are performed, and a noise reduction program is implemented.
Why is LEX,8h normalized to 8 hours?
To make exposure times and levels different, daily exposure is converted to an 8-hour reference period.

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