Noise is not just noise
Traffic, business and recreational activities like motorsport or outdoor music concerts all contribute to spoiling a city and harming its inhabitants. The source of most outdoor noise worldwide is construction and transportation systems.
Often a large number of different sources contribute to the ambient noise at any particular point. The impact of each specific noise source must be evaluated. When measuring noise, the type of noise determines the parameters to measure, the equipment to use, and the duration of the measurement.