Abstract
The 24‐h noise data now being acquired at a number of airports are providing information on the day‐to‐day variations in noise environment. Community noise equivalent level (CNEL) data acquired at four airports (three civil and one military), based on measurements at 16 positions and for periods ranging from 13 to 193 days, show trends that may be useful for planning purposes. Plots of the standard deviation for the daily values (weekdays only for the military airport) versus the logarithm of a typical distance from the aircraft to the monitoring position show that the variability increases slowly with distance from the aircraft. The standard deviations at positions under the landing path (distances of approximately 400 ft) are of the order of 2 dB. The standard deviations increase to the order of 3 dB at a distance of 3000 feet. The weekday and weekend noise environment near the military airport shows distinct differences reflecting the large reduction of operations on weekends. Correlation of daily nois...
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