Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.1706.1711CelenI. H.ArinS. 122003619In this study, a digital sound level meter was used to measure noise levels surrounding the tractor operator and in open air. Tractor, equipment and environmental conditions were taken into consideration as sources of noise pollution. Intensity of noise pollution caused by those sources was determined at the point where drivers and assistant driver stood. The influence of engine speeds and transmission gears on noise levels were determined. The level of annoyance depends not only the level of the noise but also operators position and the duration. The levels of the noise when the tractor was in neutral were also measured. Maximum noise level was measured in exhaust as 91.7 dBA while the minimum noise level was at the surrounding of the tractor operator as 79.7 dBA. An increasing of 3 dBA was measured for engine speed changes from 1000 to 2000 rpm.]]>Arin, S. and I.H. Celen,19951995Meyer, R.E., C.V. Schwab and C.J. Bern,19933610491056Sabanci, A. and C. Ozsahinoglu,19851985Sabanci, A. and E. Uz,19841984Sabanci, A., C. Ozsahinoglu, F. Ozguven and R. Ozsoy,19841984Suggs, C.W.,19871987Thrumann, A.,1990TSE Standards,1991Broste, S.K., D.A. Hansen, R.L. Strand and D.T. Stueland,198979619622