Saturday, July 30, 2005
Accounting noise pollution
As we revolutionize, our needs, usage and our exhausts increase. Hence the word pollution comes into the scene. It becomes an absolute necessity for cosmopolitan cities to analyze, monitor and mitigate the impact of noise pollution.
This article discusses the effect and the possible solution for the city of Paris
26 million microphones installed at every corner of the cyber city gives enormous acoustic data. With other parameters like volume and variety of traffic in about 1000 miles of roads, size, shape and acoustic property of the buildings, the construction material used for roads a computer equipped with a Geographical Information System utilizes this voluminous data to pattern the city’s Day Night Level (DNL) of noise pollution.
The analysis provided the following results
The pattern of the city acts like a sound amplifier. Sound flows like running water (as shown by the arrow marks) to the center resulting in extremely loud and intolerable noise levels.
Express roads that carry 1.2 million vehicles a day around the city are the prime source of noise pollution. Hence abatement walls were built on either side of the roads to protect the city.
7 % of the population is regularly exposed to noise of intensity more than 70 decibels. This is like hearing the noise form a vacuum cleaner for 16 hours.