According to the World Health Organization (WHO), air pollution poses a significant threat to health. Despite technical progress in the development of motor vehicle engines, the transport sector has the highest emissions of particulate matter and nitrogen oxides in particular. In addition, more and more people are exposed to harmful environmental pollution. The reason for this is not only the rising volume of traffic, but also the increasingly dense population growth in cities.

The German Federal Immission Control Act stipulates that harmful environmental impacts on areas in need of protection must be avoided when building public roads.

The legal definition of when a harmful environmental impact exists is set out in the Ordinance on Air Quality Standards and Emission Ceilings (39th BImSchV), which is based on European directives. At present, the immission limits for particulate matter (PM10 and PM2.5) and nitrogen dioxide (NO2) set out in the Ordinance are of particular importance. They are based on WHO recommendations and are frequently exceeded in conurbations at traffic-heavy sites.

In the case of new road construction and expansion planning within the framework of planning approval procedures and feasibility studies, we prepare forecasts regarding air pollution levels. In the event that the immission limit values are exceeded, Möhler + Partner Ingenieure AG proposes measures that ensure compliance with these values.

In order to control the actual air quality on existing roads, we carry out measurements for you and assess them on the basis of the legal requirements.

Besides the protection of human health, nature conservation is also important. Air pollutants from traffic and agriculture result in nitrogen depositions such as ammonia and nitrogen oxides, which reduce species/plant diversity in nature reserves. For your road construction or expansion plans, we can map the effects on fauna and flora habitats (FFH) and evaluate them from an immission control perspective.

Our Scope of Services

  • Calculation and assessment of the effects of air pollutants on surrounding sensitive areas (39. BImSchV, TA Luft)
  • Microscale dispersion calculations for small-scale urban traffic-related planned developments
  • Screening calculations for large urban areas
  • Performance of air immission measurements, especially of particulate matter (PM10, PM2.5) and nitrogen oxides
  • Nitrogen deposition calculations for traffic-related air pollutants
  • Proposal of measures for protection against air pollutants and calculation of effectiveness


  • Bypass of the B300 Diedorf, Augsburg State Building Authority
  • Railroad crossing – Concept Velpe, DB Netz AG
  • Connection of Schleissheimer Strasse to the A99, state capital Munich
  • Bypass Neuburg a. d. Donau, City of Neuburg a. d. Donau
  • 6-lane extension of the A92, Southern Bavaria Autobahn headquarters
  • 3-lane extension of the B16 Weichering, Ingolstadt building authority

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