Study of noise pollution in workshops andnoisemaking jobs in Zone 3 of District 12 of Tehran (Bazar Bozorg) using GIS

In large cities (metropolitan areas) the most important causes of noise pollution are transport systems, urban land uses, including heavy industries, workshop and noisy jobs. The workshops scattered throughout Tehran, such as carpentry, turnery, smoothing and smithery, in the vicinity of residential areas, and educational-healthcare centers can increase and affect the noise pollution level.
To determine the status of industries activities and occupations which are responsible for noise pollution and noise pollution increase in Tehran, an extensive study was carried out. Then the list of all the jobs and activities located within the boundaries of zone 3 of district 12 of Tehran were identified. Classification of noise polluting occupations in the study area was done in A, B groups. According to the results, the noise polluting jobs were identified to be about 1845 in number. The highest number of jobes was related to shoe manufacturing units, molding and casting and the lowest number was related to coppersmithing.
After presenting the SPL and Leq charts and also roviding the GIS maps the amounts SPL and Leq from the workshop in the study area were obtained. The maximum SPL belonged to thinsmithing and coppersmithing units and the maximum Leq belonged to bending units. The turnery workshps, in spite of having low SPL, were identified to be the noisiest units because of their high levels of activity duration and the area used. Considering the high SPL and the area used, bending workshop was ranked in the second place, and the rest of the workshops were ranked subsecuently.