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and public works and the neighbourhood‘ (WHO, 1999).Environmental noise is increasingly becoming a community concern internationally . Considerable efforts have been made over about the last four decades to reduce noise impacts from transportation sources such as road and rail traffic and aircraft. Nonetheless, many of the benefits of these efforts have been lost due to increased traffic volumes (by all modes) for longer periods of the day and evening. At the same time increases in urban population have resulted in greater exposure of a larger percentage of the population to the increased noise levels. World Health Organization stated that ―Noise must be recognized as a major threat to human well-being. According to the USEPA, there are direct links between noise and health. Also, noise pollution adversely affects the lives of millions of people. Noise pollution can damage physiological and psychological health. High blood pressure, stress related illness, sleep disruption, hearing loss, and productivity loss are the problems related to noise pollution. It can also cause memory loss, severe depression, and panic attacks. In this paper a study of traffic noise in Tirupur city has been done in the busy areas of the city which have high traffic flow in peak hours, results obtained in the study shows that the whole city is affected heavily by noise pollution more during the evening hours when compared to morning hours and in almost 90% of the area prevailing noise level is more than the ambient noise level. It has been found that in many areas the noise level prevailing averages around 85 db at 90% of the busy points of the city. Most of the noise is generated only due to horns of vehicles like rickshaws, buses, wagons & trucks etc., Tirupur being a small and congested city, creates chronic issues related to noise pollution. The city is rapidly developing, more and more vehicles are being used regularly which adds thrust on noise level in the city which in turn will create many health issues. Since the traffic noise is increasing more in this city day by day so this has to be analysed and controlled so that no health hazards pose. Keywords: Noise pollution, noise data, noise monitoring, noisemodelling INTRODUCTION Besides with the growing level of air and water pollution, road traffic noise pollution has been recognized rising as a new threat to the inhabitants of cities. The urban environmental quality of developing countries ―cities‖ has been deteriorated by an unlimited increase of vehicles, infrastructure, and population. Consequently, the continuous increased intensity of traffic noise level due to the population has degraded urban quality of life. Road traffic noise is the big challenge for urban planners and environmental engineers to overcome road traffic noise in cities [1]. Continuous high level of noise can cause serious stress on the auditory and non-auditory, and nervous system of the city dwellers [2,3]. It is also leading cause of great annoyance for exposed population due to the poor conditions of engine, exhaust etc. [4]. In addition, there are various studies carried out on road traffic noise pollution, which effect severe health problems such as, physical and psychological, irritation, human performance and actions, hypertension, heart problems, tiredness, headache and sore throat respectively[5]. Noise is an unwanted sound; it causes social effects, feelings of disturbance, stress reactions, sleep disorders, some hormonal changes, increased blood pressure, increased risk of myocardial infarction, impairment of well-being and general quality of life. The effects of noise has been studied on humans [6-9], animals [10] and plants [11]. and buildings. Noise is a major factor that should be considered in the design and construction of new transport systems, as well as when improvements are made to existing systems [12] (AboQudais et al., 2007). In addition, local authorities and environmentalists recognise the importance of monitoring trends in noise pollution when developing mitigating plans. As such, there is an obvious need to Keerthana et al., Sch. J. Eng. Tech., 2013; 1(3):154-168 155 measure and model noise pollution. Non-auditory physical health effects that are biologically plausible in relation to noise exposure and annoyance from noise exposure include changes in blood pressure, Heart rate, and levels of stress hormones [7]The biological mechanism linking noise to hypertension is thought to be mediated through sympathetic and endocrine stress response with subsequent acute changes in vascular tension. The hypothesis is that long-time exposure to noise could result in lasting cardiovascular changes such as atherosclerosis, and increase cardiovascular risk as well as hypertension.[8, 7]. The present work analysis the vehicular traffic noise during the morning peak hours and evening peak hours. A large number of set of data were recorded at different data in a random manner in order to account for statistical temporal variations in traffic flow condition. The noise measurement parameters recorded was using sound level meter (SL-4001) The study reports community noise levels measured in fast developing semi- urban areas of Tirupur city, which is one of the rapidly developing industrial city in Tamilnadu supporting millions of people for their livelihood[13] MATERIAL AND METHODS Study area details Since the 1990s, the 

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