LA90 definition

LA90 means the decibel (dB) level exceeded for 90% of each sample period;
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LA90 means the decibel (dB) level exceeded for 90% of each sample period; “Local Planning Authority” means Powys County Council;
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LA90 means the A-weighted sound pressure level that has been exceeded for 90% of the sample period.
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Examples of LA90 in a sentence

  • LAeq (EN) should not exceed LA90 (WEN) by more than 5dB and the L10 (EN) should not exceed L90 (WEN) by more than 5dB in any 1/3 octave band between 40 and 160Hz. [EN = entertainment noise level; WEN = representative background noise level without the entertainment noise, both measured 1m from the façade of a noise-sensitive premises].

  • Baseline noise monitoring for the A-weighted levels LAeq, LA10 and LA90 should be carried out daily for a period of at least two weeks at a minimum logging interval of 30 minutes between 0700 and 1900.

  • The background noise level LA90, 15 minute is to be determined in the absence of noise emitted by the use and be representative of the noise sensitive receiver.

  • The background noise level LA90, 15 minute must be determined in the absence of noise emitted by the use and be representative of the noise sensitive receiver.


More Definitions of LA90

LA90 means the A-weighted sound pressure level that is exceeded for 90 per cent of the time interval considered.
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