Day-night time normal degree, DNL or LDN: This measurement assesses the cumulative exposure to sound to get a 24-hour period (Leq about 24 hrs) in the year, by using a 10 dB(A) penalty or body weight extra to nighttime noise measurements supplied the increased sensitivity to noise in the evening. https://soundinsulation13455.therainblog.com/31048579/how-quiet-living-can-save-you-time-stress-and-money