Noise Immission Control – Analysis and Solution of Sound-related Challenges from Urban Land Use Planning to Noise Protection Expertise

Noise emissions, especially from traffic and industry-related sources, are a relevant negative environmental impact. Many citizens complain about strong noise pollution. In the context of urban development planning, there is therefore a field of tension between the protection of the population on the one hand and the economic and cultural development of the city on the other. This conflict is further intensified by increasing urbanization and rising traffic volumes.

Against this background, the planning of new traffic routes and industrially and commercially used areas as well as the development of residential areas requires a comprehensive analysis and detailed forecasts. In order to avoid conflicts and high additional costs caused by subsequent noise abatement measures, it is essential to identify potential exceedance of limit values at an early stage and to develop innovative solutions.

As a measuring institute for the determination of emissions and immissions of noise, accredited according to DIN EN ISO/IEC 17025:2018 and announced according to § 29b BImSchG, we support you in all questions of noise immission control. For noise calculation, we use our own developed software IMMI.

Our service portfolio in the field of noise immission control

We measure noise immissions with the most modern measuring technology, conduct propagation simulations and are available to advise on legal and technical questions regarding immission control. In addition, we develop optimized and legally compliant solutions for noise problems in the following areas:

  • Construction noise
  • Workplace noise
  • Traffic noise – from individual construction projects to supraregional feasibility studies
  • Commercial and industrial noise – according to TA Lärm
  • Sports and leisure noise

We have many years of experience and provide legally compliant expert opinions in urban land use planning, noise allotment and noise monitoring.

Immission Control in the Field of Traffic Noise

Caused by cars, trucks, trains and airplanes, traffic noise has long been one of the biggest problems in immission control, especially in conurbations. According to a survey conducted by the Federal Environment Agency in 2018, 75 percent of the German population feels disturbed or annoyed by road traffic noise, 42 percent by air traffic noise and 35 percent by rail traffic noise. In addition to the declining quality of life, there are also health risks. Permanently high levels of exposure can lead to cardiovascular diseases, for example.


There are different regulations and guidelines for the different types of traffic noise. For example, the immission limits laid down in the Traffic Noise Protection Ordinance (16th BImSchG) must be observed during the construction and major alterations of existing roads and railroads. Existing traffic routes are not covered by this. Nevertheless, noise abatement programs are available in many places.

Protection against traffic noise starts with the individual and on a small scale. However, in order to significantly reduce noise pollution, various measures must be combined. As a rule, the first step is to avoid noise sources. If this is not possible, it is examined whether the noise source can be shifted in time or space. Then, measures to reduce the noise  such as lower speeds  have to be developed. The final step is to take compensatory measures for those affected. These include noise protection windows or compensation.

Our service portfolio in the field of traffic noise: We provide noise forecasts and calculations as well as noise immission reports for road, rail and aircraft noise

We get to the bottom of traffic noise by making noise and noise sources visible. Based on this, we develop effective measures for noise reduction.

Calculation of road traffic noise according to RLS-19

Since 2019, a revised calculation rule has been available for road traffic noise, which, among other things, takes into account new, low-noise surface layer and better reflects today's noise pollution. We have been waiting a long time for this, so that we can now calculate the noise even more accurately.

Calculation of rail traffic noise according to Schall 03

Since 2015, rail traffic noise has been calculated according to the revised Schall 03. In view of the significantly higher noise levels we are now faced with, we are obliged to plan considerably better noise protection measures  we are well prepared for this.

Calculation of aircraft noise

We calculate aircraft noise according to national and international regulations:

  • Aircraft noise protection zones according to the Aircraft Noise Act (AzB/AzD)
  • Noise maps according to EU Environmental Noise Directive (BUF) and European Directives (ECAC. CEAC. Doc. 29)
  • Noise pollution at landing sites and special landing areas (helicopters) according to DIN 45684 and the instructions of the German State Committee for Immission Control (LAI)

In addition, we optimize flight routes according to noise pollution criteria as a basis for assessment procedures and have extensive experience in the field of aircraft noise monitoring.

Wölfel was also involved in the Federal Environmental Agency's research project "Evaluation of Flight Routes under Noise Impact Aspects". Together with the partners Lärmkontor, OTSD and konsalt a procedure for the noise impact assessment of flight routes was developed. Read the final report on the website of the German Federal Environmental Agency.

Noise Mapping and Noise Action Planning According to the Environmental Noise Directive 2002/49/EC

According to the Environmental Noise Directive (Directive 2002/49/EC), the competent authorities have to determine, visualize and evaluate the current noise situation for agglomerations, major roads, major railroads and major airports. According to § 5 para. 1 of the Noise Mapping Ordinance (34th BImSchV), the exposure is not measured but calculated with the help of validated methods  once for the whole day (24 hours, LDEN) and once for the night (LNight). The results are displayed in different colors in so-called noise maps, so that it is clear at first glance where limit values are exceeded. Such noise maps must be prepared separately for each of the individual noise types  road, rail, air traffic and industrial noise  and reviewed at regular intervals or revised as necessary.

On the basis of these noise maps, strategies and measures for noise reduction/noise control and the protection of quiet areas are then developed with the participation of the public. With the help of these noise action plans, “noise hot spots”  areas in which the quality of life and health of the residents are impaired  are to be avoided. The results can also be incorporated into urban planning.

Our service portfolio in the field of noise mapping and noise action planning

We have many years of experience in noise mapping according to the Environmental Noise Directive 2002/49/EC for road traffic noise, rail traffic noise, industrial noise and aircraft noise

  • in Germany, in accordance with the requirements of the Noise Mapping Ordinance (34th BImSchV) in conjunction with § 47 BImSchG according to the current calculation regulations BUB, BEB and BUF
  • EU-wide according to national regulations.

We advise state authorities, municipalities and metropolitan areas on the procurement of input data, create calculation models, calculate noise maps/pollution and support you in reporting to the EU and in coordination with the public authorities.

As part of the noise action planning, we determine the focus of exposure, develop approvable reduction concepts in close cooperation with the planning committees, demonstrate the effectiveness of measures and plan quiet areas.