To mitigate aircraft noise in the surrounding areas of by mzq79210


									To mitigate aircraft noise in the surrounding areas of Kadena Air Base and Futenma
Air Station


         In February 1988, areas around both Kadena Air Base and Futenma Air
Station in Okinawa were designated as places that should pursue Japanese
environmental quality standard for aircraft noise.
         The surrounding areas were categorized into two types. Areas of Category I are
the areas exclusively used for residential purposes and those of Category II are the
areas that requires normal living conditions, but do not fall into Category I. WECPNL,
or “noise index”, of 70 or less is specified for type I areas and 75 or less for type II areas.
(see page 1)

Result from monitorings at Kadena Air Base

         2002 monitoring results at Kadena Air Base shows WECPNL values exceeded
at 9 out of 14 sites for monitoring. Especially, 89.9 WECPNL was recorded at Sunabe,
83.0 at Yara B and 82.7 at Mihara, largely exceeding the Japanese standard levels. (see
page 5)
         If compared with the result from prior year 2001, the latest result of 2002 can
be summarized that the values slightly decreased or stayed the same. However it
should be noted that in 2001, frequency of noise occurrences rapidly increased for
night-to-early morning hours and the noise occurrences are still frequent, not
succeeding in mitigating the situation back to the levels of 1997 through 2000. (see
pages 7 and 8)
         Therefore, the aircraft noise emitted from Kadena Air Base gives enormous
impacts to the living environment of the surrounding communities.

Result from the monitorings at Futenma Air Station

         2002 monitoring results at Futenma Air Station shows WECPNL values
exceeded at 4 out of 9 sites. Especially at Ueojana, the value was 81.1 and at Nodake at
76.1, showing that the noise environment were largely away from the normal standard
set in Japan. (see page 10)
         For frequency of noise occurrences, the values largely exceeded at Aragusuku,
jumped from 24.6 times of prior year to 77.3 times in the latest result.
         For night-to-early morning hour frequency levels of noise occurrences,
recordings at Ueojana showed a tendency of frequency increasing, which resulted in the
value over 100 times/month in 2002. (see page 11)
         Therefore, noise emission from Futenma Air Station gives large impacts to
living quality of the surrounding communities.


With the explanation above, we think that it is necessary to strictly abide by the
abatement measure for aircraft noise agreed by the two governments, in order to create
a fine and sound living environment for the surrounding communities around the two
air stations.
Figure F1 Monitoring Results of Aircraft Noise around Futenma
          Air Station

                                   boundary of areas subjected to
                                   the environmental categorization

                                    Aragusuku 72.6
                                             5          1 Nodake 76.1
                  Oyama 69.4
         Mashiki 70.1           Futenma Air Station
                           7                        2 Aichi 63.9
         Ueojana 81.8 4                  6 Ginowan 67.9

                                       3 Ganeko 66.9

  Ahacha 68.8

                                                              *Unit : WECPNL
                 boundary of areas subjected to
                 the environmental categorization                       stations with values
                                                                      exceeded the standard

                                                                   : Category    (70 or less)

                                                                   : Category    (75 or less)

                                                    0                                 5km


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