If linking to the google chart is too much of an effort, I've added a chart from SCRIBD that has some extra pages of info. It puts washing machine, dishwasher, and refrigerator at 65 dB and electric shaver at 65. How loud is 65 dB DNL? Here's a google docs chart that shows you lots of examples. How does the fact that the decibel scale goes up logarithmically affect an 'average'?) (I'm not sure, I don't know exactly how they calculate. So, from what that definition says, you could have ten minutes of 120 dB per hour and probably still get a 65 dB DNL. So if on average you have ten minutes per hour of jets flying over your house, it would appear that decibel level is averaged with the 50 minutes of quiet. It means the average over a 24 hour period is 65 dB. That doesn't mean the sound level stays below 65 dB. The Metropolitan Airports Commission publishes Aircraft Day-Night Level values as "ADNL" to avoid confusion with other uses of "DNL." While DNL also may be used for non-aviation purposes, the FAA's use of DNL is specific to aircraft noise. The current federally-established threshold of significance is 65 dB DNL. the output is a numeric value in decibels that represents a 24-hour average noise exposure value. The calculation for DNL considers the time of day an aircraft operated and applies a 10-decibel penalty on aircraft arriving or departing between 10 p.m. Environmental Protection Agency as the principal metric for airport noise analyses. "DNL" is the acronym for Day-Night Average Sound Level, which represents the total accumulation of all sound energy, but spread out uniformly over a 24-hour period.ĭNL has been widely accepted as the best available method to describe aircraft noise exposure and is the noise descriptor required by the FAA for use in aircraft noise exposure analyses and noise compatibility planning. The Federal Aviation Administration (FAA) established DNL as the primary metric for aircraft noise analysis and expressing aircraft noise exposure in the United States. Below is a definition of DNL from MACNoise: They don't explain DNL, but I have google working for me. I'd also note there are two major hospitals just east of where I ended the blue dots that definitely are affected. I added the blue dashes to show how far significant (at least) noise goes beyond those red dots. The dotted red lines shows the area labeled: During Construction 65 DNL Noise Contour
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