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· The official measure of noise, leq, (see glossary, page 3) does not take sufficient account of the increased number of aircraft.
· There is no cut-off point at the 57 leq contour. Even as far from the airport as about 15 miles east or west, at least 10% of people say they are ‘very annoyed’ by aircraft noise.
· For the same amount of aircraft noise, people are more annoyed now than at the time of the last survey in 1982. At the same noise level (57 leq) the level of annoyance has gone up from ‘little annoyed’ in 1982 to somewhat higher than ‘moderately annoyed’ now. That is attributed to a higher expectation of acceptable living conditions, higher average incomes, and a greater willingness to be critical of officialdom.
· Aircraft noise at night is more annoying than during the day, especially between 2300-0300 when people find it 80% more annoying, thus justifying limits on night flights.
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