Noise level versus number of citizens

In this paper a resume of six years of working and researching on the evaluation of noise pollution in 56 cities of the Valencian Community (Spain) is presented. The main source of this noise pollution is due to urban traffic. The aim of this paper is to establish the possible correlation between the noise level and the official register of citizens in those cities, which are from a wide range of the population; from 1110 to 750000 inhabitants. This could be a good method to obtain conclusions whether a city has the right level of noise according to its population or, on the other hand, whether the noise level is too high or too low.