Investigation of Noise Level in Trakai City during Day

Abstract

Through the last 10 years noise in the cities grew up meanly 0.5 – 1 dB per year. Noise is having direct impact on human health also on living and recreation environment quality. For our investigation the town of Trakai was chosen. Trakai is the center of a region; also it is very important as historical and as recreation site, where history and nature are combined together as harmony as a whole. That is why, especially in the period of warm season, there are a lot of tourists and guests arriving by different means of transport. To estimate the noise level rate per 24 hours, the levels of noise were measured in 16 places. Noise was measured in July 2007, three times per day (day – 6.00 – 18.00 h, evening – 18.00 – 22.00 h and night 22.00 – 6.00 h). For the measurement of noise levels "Bruel&Kjaer 2260 Mediator" noise level meter was used. From measurement of noise levels during day time we can see, that the highest equivalent noise levels were measured in sites near the main streets of the town and near the night club "Salos". The measured noise levels reached 61 – 64 dB(A), and did not exceed the limit of noise level which is 65dB(A). Measures of noise levels in the evening time determined that the highest levels of noise also as in day time were near main streets of the town and near night club "Salos". Here the levels of noise varied from 57 to 62 dB, and the highest 75 dB equivalent level of noise was measured near the crossroad of the most intensive streets. The limit of noise level during night time exceeded only in one site near the exit of Trakai town, in the other sites the level of noise varied from 45 to 53 dB(A) and did not exceed the limit of noise level (55 dB(A)). To compare the levels of noise in different times of a day, it is seen, that higher level of noise is measured in the evening time was 1,2 dB(A) higher than measures which were made during day time.