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Old 08-12-2015, 09:30 AM
 
1 posts, read 930 times
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The City of Chicago has a neat trick to hide intense aircraft noise from its residents. It uses an averaging computation called "DNL." Noise intensity is measured in 24 hours increments at various noise detectors around the city. When the noise from aircraft drops at any monitor, due to aircraft using a runway on the other side of the airport, and away from a particular moitor, the city averages in those times and days when heavy jet aircraft are flying and in the vicinity of the monitor. Averaging days when there is little or no aircraft in the area with days and times when heavy jet aircraft are in the vicinity of the monitor always yields a lower DNL or noise intensity calculation. Many thousands of Chicago residents are experiencing aircraft noise above 65 decibels but the DNL computations do not reflect this; the DNL computations make it appear as those residents are experiencing acceptable levels of aircraft noise. Mike in Chicago
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