Exposure to railway noise was calculated for all addresses using
SoundPLAN, with implementation of NORD 2000. Input variables were
geographical coordinate, railway link swith information on annual average
daily train lengths, train types, travel speed; building polygons with
building heights and noise barriers along the railway. Railway traffic
noise was expressed as Lden at the most exposed facade. The noise impact
from all Danish airports and airfields was determined from information
about noise zones (5 dB categories) obtained from local
authorities and transformed into digital maps and linked to each
address.