Abstract
It is widely accepted that people are more annoyed by noise during the evening and nighttime hours than during the day period. Accordingly, many community-noise rating indices involve a division of the 24-h day into two or three time periods, attaching different weights to events in each. Unfortunately, it has proved very difficult to obtain quantitative measurements of these weightings through social survey studies, and consequently the weightings adopted tend to be based mostly upon intuitive judgments. This paper describes an attempt to obtain direct measurement of relative sensitivity to noise during the three periods. The measurements, which were made as a part of a wider study of the aircraft noise problem, support current estimates of increased sensitivity during the evening, but indicate a surprising immunity to noise during the night.
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