A lot of industrialization is taking place in and around the city of Tiruchirappalli. The number of apartment goes on increasing in Tiruchirapplai due to rapid increase in population and unavailability of sites to construct houses. The crowd in the apartment and their activity lead to enhanced sound level. Exposure to high level of noise may cause severe stress on the auditory and nervous system. The present study aims to monitor the ambient noise level at eleven different apartments at Trichy from 8.00am to 8.00pm in the month of December 2006 to March 2007 and to evaluate traffic noise index.