N2 - Transportation noise is a main source of noise pollution. It is assumed that it consists of recognizable noise events which come from moving aircrafts, trains and boats. The noise of an isolated sound event is assessed by the sound exposure level, LAE. Much legislation and many regulations and guidelines employ the A-weighted time-average sound level, LAeq,T, with the time interval T of one hour or longer. LAE measurements enable an approximation of LAeq,T. The key point is the uncertainty of this approximation. It has been shown that an increase in the number of LAE categories brings about a decrease in uncertainty. For illustrative purposes, LAE measurements of aircrafts taking off and landing were carried out. L1 - http://www.journals.pan.pl/Content/101334/PDF-MASTER/aoa-2016-0013.pdf L2 - http://www.journals.pan.pl/Content/101334 PY - 2016 IS - No 1 EP - 138 DO - 10.1515/aoa-2016-0013 KW - noise propagation A1 - Makarewicz, Rufin A1 - Gołębiewski, Roman PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 41 DA - 2016 T1 - The Uncertainty of Noise Composed of Separate Sound Events SP - 133 UR - http://www.journals.pan.pl/dlibra/publication/edition/101334 T2 - Archives of Acoustics