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Leq - Equivalent Sound Level

Equivalent Sound Level - Leq - quantifies the noise environment to a single value of sound level for any desired duration

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The Environmental Protection Agency - EPA - has adopted a system of four "sound descriptors"

to summarize how sound is heard and measured, and to determine the impact of noise on health and welfare.

Equivalent Sound Level - Leq

Equivalent Sound Level - Leq - quantifies the noise environment to a single value of sound level for any desired duration. This descriptor correlates well with the effects of noise on people. Leq is also sometimes known as Average Sound Level - LAT.

Equivalent Sound Level - Leq - can be calculated by integrating the sound pressure level over a time period as:

Leq = 10 log [(1/T) ∫ (pA / pref)2 dt ]                               (1)


Leq = equivalent sound level (dB)

T = time period (s)

pAsound pressure (Pa, N/m2)

pref = reference sound pressure ( 2 10-5  Pa, N/m2)

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  • en: equivalent sound level
  • es: nivel de sonido equivalente
  • de: gleichwertigen Schallpegel
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