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NOISE LEVEL

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A measure of SOUND PRESSURE LEVEL, given the symbol L. Various subscripts define the nature of the measurement, most commonly as follows:

L₁₀: sound level exceeded 10% of the time (PEAK LEVEL)

L₅₀: sound level exceeded 50% of the time (average or mean level)

L₉₀: sound level exceeded 90% of the time (ambient level); see AMBIENT NOISE LEVEL

L_A: sound level in DECIBELs measured on the A scale; see SOUND LEVEL METER

L_eq: EQUIVALENT ENERGY LEVEL

L_NP: NOISE POLLUTION LEVEL

L_dn or L_DN: day-night equivalent noise level; see EQUIVALENT ENERGY LEVEL

See: LOUDNESS LEVEL, NOISE, PERCEIVED NOISE LEVEL, SOUND LEVEL, TRAFFIC NOISE INDEX. Compare: DAMAGE-RISK CRITERIA, HEARING LEVEL.

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