Abstract
The present study documents noise pollution levels measured for the most common cars used by people in Saudi Arabia. The noise levels were measured following standard procedure by using calibrated sound pressure level meter at all sides of the car front, rear, right and left sides. This investigation has been conducted to measure the noise pollution level from Toyota car Model 2002 because it used for most Saudi people. Measurements of the noise level from this car at stationary and motion situation have been carried out. The noise levels produced by variable engine speed ranged from750 to 4000rpm were recorded. The sound level found to be 59.45 dBA when the vehicle in motion at normal speed. When the vehicle at idle speed 750rpm the maximum noise level measured at the back exhaust 50.4 dBA where the minimum level recorded at the right side 40.8dBA. When the car parked or at stationary state and the engine at 2500rpm the maximum noise level at the back exhaust is 53dB A whereas the minimum level showed from the left side. For maximum engine speed 4000rpm the back exhaust area has a maximum noise level58.2 dBA where as the right side at 51.2 dBA. The maximum sound level recorded near the engine at speed of 4000rpm was 57 dBA but the minimum level recorded at 1000rpm. From the recorded results it can be seen these measured noise level are under the acceptable ranges due to the progress and development of vehicles emission reduction and the environment protection issues. Based on the study findings it can be inferred that there is an urgent need to set up noise standards in the country to control the noise pollution level from vehicles as well as to keep clean environment.