چكيده لاتين :
The results of a study on the environmental noise pollution of the city of Arak, Iran are presented. A preliminary classification of the territory into the five acoustically homogeneous urban areas classes where noise standards have been provided by Iranian regulation was adopted for the investigation. On the basis of the resultant acoustic zoning 18 sites were selected for an experimental survey. This last has been carried out by extensive measurements of the main indices for noise pollution (Leq, L1, L10, L50, L90). Results indicate that: (a) main roads of Arak are overloaded by traffic flow during day-time period and that in all the examined sites daily average sound levels due to road traffic exceeded environmental standards by about 10 dBA; (b) environmental noise exhibits a certain degree of spatial variance resulting primarily from the peculiar geo-morphological structure of the town and from the transport infrastructure and (c) more than 30% of residents should be highly disturbed by road traffic noise.
