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. -� <br /> ' <br /> r. <br /> .r.: ,� <br /> / <br /> | <br /> | 1| <br /> How does Fig. 12 apply to airports? It helps predic reaction , yet <br /> q�N <br /> makes clear that , as we said prev1uuoly , you can eope t a range of <br /> responses from the people who live around airports . For | ample , yoran <br /> ' <br /> NEF 25, you can expect responses ranging from to <br /> "widespread complaints or single threat of legal action.I Many Dactoro <br /> influence people's reaction and account for the range of reactions found <br /> at a single <br /> levelnfezpooure ' The factors include a ttitiu d <br /> e about the <br /> airport ( such as economic dependence because of a job) , i'mportance of <br /> outdoor activities , and political sophistication . 1 <br /> | <br /> � i <br /> Time-above-threshold can also be used to predict community response <br /> . to noise control . TA is useful to describe to people the Change in the <br /> " duration of sounds at those levels that would result various <br /> alternative noise control actions . This information uu plemeotm the <br /> � information contained in the cumulative noise doonriptOrn . When TA <br /> information is presented , it may be related to specific o/ fectw by the <br /> qualitative descriptors in Table 5. Neither a cumulative e er�ymeaeur* <br /> m�� <br /> nor a cumulative time ' <br /> . ve mw meaaore such as TA alone can provide a complete ��� <br /> � <br /> � <br /> description of the noise environment around airport . b provides <br /> some useful ioformation ~ but not ell . You need cu descriptors <br /> •� for land use planning and predictions nfcommunity reaction . You need <br /> 1 <br /> . TA for data on sound levels useful for analyzing speech interference and <br /> ; other activity interference and to provide an answer t particular <br /> question "How loud?" Don` t substitute one measure other in an <br /> effort to simplify analysis . <br /> ' i <br /> TABLE 5, QUALITATIVE DESCRIPTORS APPLICABLE TO RESIDENTIAL AREAS. <br /> | <br /> _________ <br /> Threshold Speech Communication Outdoor JUdgments <br /> � <br /> Exceeded Disturbance Indoors | of 5ingl Event <br /> ! [d8/�\l ___ __- - -� M�xi <br /> Windows Windows | <br /> � ! <br /> , Open Closed | <br /> -1 ._l_. <br /> -~~-� .. <br /> , 65 just noticeable none | quiet <br /> , T5 moderate just ooticeatIe m,enrrolly ucceptable <br /> | 85 severe moderate noisy 1 �Q�. <br /> � �NNw <br /> / <br /> 95 extreme severe excessively noisy <br /> � - -- ------ '- i --- <br /> ' <br /> 31 <br /> . <br /> / <br /> ' � <br />