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formation of the new Tirupur district had been urged by the exporters of Tirupur. Tirupur city and surrounding region, where there is considerable industrial and business activities, was to be the core area. They believed that a new district would facilitate administration of the region and allow more aggressive development measures. Tirupur district was formed in 2009, carved out of the Coimbatore and Erode districts making it the 32nd district of Tamil Nadu and one of the tenth most industrialised and economically developed districts of TamilNadu. Before the formation of Tirupur district, Avinashi, Madathukulam, Palladam, Tirupur, and Udumalpet were taluks of Coimbatore district; and Dharapuram and Kangeyam were taluks of Erode district. The new taluk Madathukulam was formed after the district was created. Tirupur district lies on the western part of Tamil Nadu bordering the western ghats and hence the district enjoys a moderate climate.The district is surrounded by Coimbatore district in the west,Erode district to the North and northeast and Karur district in the east and Dindigul district in the south east.To the south the district is surrounded by Kerala state(idukki district).The district has an area of 516.12 square kilometers.the southern and south western parts of the district enjoys maximum rainfall,due to the surrounding of western ghats.The rest of the district lies in the rain shadow region of the Western Ghats and experiences salubrious climate most parts of the year,except the extreme east part of the district. The mean maximum and minimum temperatures for Tirupur city during summer and winter vary between 35°C to 18°C . The average annual rainfall in the plains is around 700 mm with the North East and the South West monsoons contributing to 47% and 28% respectively to the total rainfall. The major rivers flowing through the district are Noyyal and Amaravathi. The Amaravati river is the main source of irrigation in the district. Amaravathi Dam, which created Amaravathi Reservoir, is located at Amaravathinagar.Thirumurthy dam which is created by the PAP project is situated in this district.Both Amaravathi dam and Thirumurthy dam are the prime source of irrigation in the district,whereas Uppaar dam is another dam which receives water from seasonal rains. Economic base Tirupur town is one of the export business oriented cities of India and an internationally known town because of its numerous apparel ( Banian ) manufacturing industries spread over the entire town. The hot and cool weather condition in the city is in favour for Hosiery industry. In the 2001 census, Tirupur district had a population of 1,917,033, of which males constituted 976,802 and females constituted 940,231. In the 2001 census, the urban population was 825,006 and the rural population was 1,092,027. Tamil was the principal language spoken in the district, with sizable minorities of Telugu, Malayalam and Kannada speakers. Hindus formed the majority of the population at 90.08% followed by Muslims at 5.33%, Christians at 4.35% and others at 0.24%. In the 2011 census Tirupur district reported a population of 2,471,222, roughly equal to the population of the nation of Kuwait or the US state of Nevada. This gave it a ranking of 176th among districts in India (out of a total of 640). The district had a population density of 476 inhabitants per square kilometer (1,230 /sq mi), up from the 2001 population density of 367 inhabitants per square kilometer (950 /sq mi). Its population growth rate over the decade 2001-2011 was 29.69%. The relatively large growth rate was due to an influx of workers from other parts of India due in turn to Tirupur's rapid industrialization during the period. Tirupur had a sex ratio of 988 females for every 1000 males, and a literacy rate of 79.1%. In 2011 the populace was 38.52% rural and 61.48% urban; this represented an increase in the urban populace of 39.13% from 2001, and a relatively lower increase in rural of 15.37% from 2001. Tirupur was constituted as Municipality during the year 1947. It was upgraded as Special Grade Municipality during 1983 and upgraded as Corporation from 1.1.2008. The total area of the Municipality is 27.19 Sq. Km with 52 wards. Total population as per 2001 census is 3,51,501 the floating population of the Keerthana et al., Sch. J. Eng. Tech., 2013; 1(3):154-168 156 town an average 1,50,000, 85% of the people commute in their own vehicle which creates more and more noise pollution in the main areas. Noise pollution and its impact The city of Amman, Jordan, has been subjected to persistent increase in road traffic due to overall increase in prosperity, fast development and expansion of economy, travel and tourism. The author had investigated traffic noise pollution in Amman. Road traffic noise index l10(1h) was measured at 28 locations that cover most of the city of Amman. Noise measurements were carried out at these 28 locations two times a day for a period of one hour during the early morning and early evening rush hours, in the presence and absence of a barrier. The calculation of road traffic noise (CRTN) prediction model was employed to predict noise levels at the locations chosen for the study. Data required for the model included traffic volume, speed, percentage of heavy vehicles, road surface, gradient, obstructions, distance, noise path, intervening 

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