Indicator noise

740,000 people are exposed to harmful or annoying road traffic noise. In addition, 33,000 people are exposed to excessive rail traffic noise and 80,000 to air traffic noise. More than 90% of exposed people to harmful or disturbing traffic noise live in towns or agglomerations.

In order to provide the degree of protection for the population that is stipulated in the Federal Constitution, noise will have to be combated through measures directly at source to an increasing extent. In the area of road transport, the greatest noise abatement effects can be achieved through the use of low-noise road surfaces and quieter tyres, and by optimising traffic flows and adapting speed limits at the local level. To more effectively reduce railway noise, the federal government is already focusing its funding on measures at source and supporting investment in quieter rolling stock. The anticipated technological progress relating to noise protection measures is likely to be offset by increasing urbanisation, the constantly growing demand for mobility and the trend towards a 24-hour society.

• Related indicators
• Noise impacts on health
• Rail transport
• Road traffic
• Subjective noise pollution

sonBASE is a tool for calculating road noise emissions on the basis of available fundamental data (official geodata, statistics, traffic data, etc.). In the noise calculation module (CadnaA) the degree of dissemination and the resulting ambient noise levels are then calculated with the aid of a digital height model, the available building data, emission data (road noise) and the effective emissions (railway noise). With respect to aircraft noise, the available measurements at civil airports and military airfields are adopted as ambient noise levels. The basis for assessing the number of people exposed to road, rail and aircraft noise is the exposure limit level specified in the Swiss Federal Noise Abatement Ordinance (SR 814.41) in relation to the defined sensitivity levels (SL I to IV).