Ldn definition

Ldn means licensed dietitian/nutritionist.

Ldn. (day-night average level) means the average equivalent A-weighted sound level during a twenty four (24) hour day, obtained after the addition of ten (10) decibels to sound levels in the night after 10 p.m. and before 7 a.m. Reserved for future use.

Ldn means a day-night average sound level and serves as a basic measure for quantifying noise exposure, namely, the A-weighted sound level averaged over a twenty-four hour time period, with a ten decibel penalty applied to nighttime (ten p.m. to seven a.m.) sound levels.

Examples of Ldn in a sentence

• Prior to issuance of a building permit, the applicant shall submit a report to the Building and Safety Division and the Zoning Officer by a qualified acoustic engineer certifying that the interior residential portions of the project will achieve interior noise levels of no more than 45 Ldn (Average Day-Night Levels).

• The Leq is the foundation of the composite noise descriptors such as Ldn and CNEL, as defined above, and shows very good correlation with community response to noise.

• However, where it is not possible to reduce noise in an outdoor activity area to 60 dB Ldn /CNEL or less using a practical application of the best-available noise-reduction measures, an exterior noise level of up to 65 dB may be allowed, provided that available exterior noise-level reduction measures have been implemented and interior noise levels are in compliance with applicable standards.

• When determinations on land use compatibility using Table 1 of appendix A differ between Ldn 65–70 dB and Ldn 70–75 dB, the determinations should ei- ther use the more conservative Ldn 70–75 dB column or reflect determinations based on local needs and values.

• The day night noise level (Ldn) is based on the Leq, and is used to measure the average sound impacts for the purpose of guidance for compatible land use.

More Definitions of Ldn

Ldn means the 5 day “Day Night Average Sound Level” as defined in NZS6801:1999 and is the night-weighted sound exposure level in A-frequency weighted decibels. (An additional 10 dBA is added to the Leq for the period from 10 pm to 7 am.) It is measured for 24 hours from midday to midday.

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB imposed on the equivalent sound levels for night time hours between 10:00 P.M. and 7:00 A.M.

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB imposed on the equivalent sound levels for night time hours between 10 PM and 7 AM.

Ldn means the directly measurable sound level quantity using the day-night average sound level methodology developed for the United States environmental protection agency for estimating noise impacts at both civil and military airports.

Ldn means Lyden, Dolan, Nick & Co., LLC, a New York limited liability company.

Ldn means Day-Night Equivalent Noise Level. “LOS” means level of service.