Table 4-53: Number of People Residing in High Noise
Areas around U.S. Airportsa,b,c
(within 65 dB DNL noise level contours)
Excel | CSV
1975 |
7.0 |
3.2 |
215.5 |
1980 |
5.2 |
2.3 |
227.2 |
1985 |
3.4 |
1.4 |
237.9 |
1990 |
2.7 |
1.1 |
249.4 |
1995 |
1.7 |
0.6 |
262.8 |
1996 |
1.6 |
0.6 |
265.2 |
1998 |
R0.7 |
R0.3 |
R270.2 |
1999 |
0.6 |
0.2 |
272.7 |
KEY: dB = decibels; DNL = day night sound level; R = revised.
a Noise-level contours are graphical representations
of noise levels on a map, similar to elevation contours on a topographic map.
Noise-level contours are lines that join points of equal sound levels. Areas
between given noise-level contour lines would have a noise level between the
two contour values. The U.S. Department of Transportation, Federal Aviation
Administration (FAA) has identified FNL 65 dB as the highest threshold of airport
noise exposure that is normally compatible with indoor and outdoor activity
associated with a variety of land uses, including residential, recreational,
schools, and hospitals.
b Estimates are for areas surrounding airport property
of 250 of the largest civil airports with jet operations in the United States.
They exclude exposure to aircraft noise within an airport boundary.
c 1975 exposure estimates were made by the U.S. Environmental
Protection Agency. 1980–99 estimates were made by FAA. See the source and accuracy
statement for more details on how exposure estimates are made.
SOURCES:
Exposure:
U.S. Department of Transportation, Federal Aviation Administration,
Office of Environment and Energy (AEE-12), personal communication, Nov. 15,
2001.
Population:
U.S. Department of Commerce, Census Bureau, Statistical Abstract
of the United States 2000 (Washington, DC: 2001), table 2.
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