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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 |
3.24 |
216.0 |
1980 |
5,200 |
2.29 |
227.2 |
1985 |
3,400 |
1.43 |
237.9 |
1990 |
2,700 |
1.08 |
249.6 |
1995 |
1,700 |
0.64 |
266.3 |
1996 |
1,500 |
0.56 |
269.4 |
1997 |
1,300 |
0.48 |
272.6 |
1998 |
1,100 |
0.40 |
275.9 |
1999 |
680 |
0.24 |
279.0 |
2000 |
440 |
0.16 |
282.2 |
2001 |
411 |
0.14 |
285.1 |
2002 |
294 |
0.10 |
288.0 |
2003 |
289 |
0.10 |
290.8 |
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. 1980-2003 estimates were made by FAA.
SOURCES
Exposure:
1975-2003:
U.S. Department of Transportation, Federal Aviation Administration, Office of
Environment and Energy (AEE-12), personal communications, Sept. 19, 2002 ,
Jan. 18, 2004, and Mar. 15, 2005.
Population:
1975-85: U.S. Department of Commerce, Census Bureau, Historical National Population Estimates, Internet site
http://www.census.gov/popest/archives/1990s/popclockest.txt as of Mar. 17,
2005.
1990-99: Ibid., National Intercensal
Estimates, Internet site
http://www.census.gov/popest/archives/EST90INTERCENSAL/US-EST90INT.html as of
Mar. 17, 2005.
2000-2003: Ibid., Monthly Population
Estimates for the United States, Internet
site http://www.census.gov/popest/national/NA-EST2004-01.html as of Mar. 16,
2005.
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