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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 |
7,000 |
3.25 |
215.5 |
| 1980 |
5,200 |
2.29 |
227.2 |
| 1985 |
3,400 |
1.43 |
237.9 |
| 1990 |
2,700 |
1.08 |
R249.5 |
| 1995 |
1,700 |
0.65 |
262.8 |
| 1996 |
R1,500 |
0.57 |
265.2 |
| 1997 |
1,300 |
0.49 |
267.8 |
| 1998 |
R1,100 |
R0.41 |
270.2 |
| 1999 |
R680 |
0.25 |
272.7 |
| 2000 |
R440 |
R0.16 |
d 282.1 |
| 2001 |
446 |
0.16 |
d 284.8 |
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
DNL 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. 1980–2001 estimates were made by FAA. See the source and accuracy statement
for more details on how exposure estimates are made.
d Population estimates for 2000 and 2001 reflect the results of
the 2000 census. Data prior to 2000 is still based on data from the 1990 census,
but will be updated to reflect the 2000 census in the 2002 edition of the Statistical
Abstract of the United States. Therefore, population estimates for 2000
and 2001 may not be comparable to data that does not reflect the 2000 census.
SOURCES
Exposure:
1975-2001: U.S. Department of Transportation, Federal Aviation Administration,
Office of Environment and Energy (AEE-12), personal communication, Sept. 19,
2002.
Population:
1975-99: U.S. Department of Commerce, Census Bureau, Statistical Abstract
of the United States 2001 (Washington, DC: 2001), table 2.
2000-2001: Ibid., table US-2001EST-01 ("Time Series of National Population
Estimates: Apr. 1, 2000 to July 1, 2001").
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