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10 July 2026
Nitrogen deposition
Nitrogen deposition is the amount of nitrogen that falls on an area. In protected Natura 2000 areas, the rule is: the less, the better. In construction projects, expansions and redevelopment, additional nitrogen emissions can lead to a permit problem if the deposition in a Natura 2000 area is too high.
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Regulations
When is an AERIUS calculation required?
Since November 2022, an AERIUS calculation has been mandatory for both the construction phase and the operational phase when applying for permits under the Environmental Code. This is particularly relevant for projects near Natura 2000 areas.
- New construction of residential, commercial or utility buildings
- Expansion of buildings or business activities
- Redevelopment or large-scale renovation
- Construction or demolition projects near Natura 2000 areas
The calculation
What are we calculating, and how?
An AERIUS calculation looks at two phases, each with its own emission profile.
Construction phase. Nitrogen emissions during construction: emissions from construction equipment, trucks and personnel transport to the construction site. A one-time emission for the duration of the project.
Use phase. Annual emissions after completion: traffic to and from the property, heating systems and business activities. A recurring emission as long as the property or business is in use.
We work with the official AERIUS Calculator — the only calculation model that is accepted by the competent authority.
We collect the project data, perform the calculation and deliver a report that you can add directly to your permit application. If the deposit is too high, we will consider reducing measures: cleaner equipment, different construction phases or alternative techniques.
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Meer informatieFrequently asked questions about nitrogen
What is the threshold value for nitrogen deposition?
Projects involving deposition in a Natura 2000 area currently have a strict criterion. In practice, this means demonstrating that the deposition amounts to 0.00 mol per hectare per year, or conducting an appropriate assessment.
How long does an AERIUS calculation take?
We usually deliver a standard calculation within ten working days after the project data is submitted. In more complex projects, this may take longer.
Can you also recommend reduction measures?
Yes. If emissions are too high, we consider practical measures to reduce them. By planning wisely, many projects can still be carried out.