GAO-10-748SP: Aviation and the Environment: Survey of Airport Officials on Airport Environmental Issues, an E-supplement to GAO-10-50

U.S. Government Accountability Office

Q5. During this period, did your airport use supplemental noise metrics, other than Day/Night Average Sound Level (DNL), to monitor these noise levels?
(Total Population)

Yes
(percent)		 No
(percent)		 No answer
(percent)		 Number
of respondents
65.1 34.9 0.0 83

Q5. During this period, did your airport use supplemental noise metrics, other than Day/Night Average Sound Level (DNL), to monitor these noise levels?
(Large and Medium Hubs)

Yes
(percent)		 No
(percent)		 No answer
(percent)		 Number
of respondents
64.0 36.0 0.0 50