Methodology for estimating emissions from agriculture in the Netherlands: Calculations for CH 4, NH 3 , N 2 O, NOx , NMVOC, PM 10, PM 2.5 and CO2 using the National Emission Model for Agriculture (NEMA) – update 2021

Every year, the Netherlands reports, both nationally and internationally, the quantities of substances that are emitted into the air by its agricultural sector. This entails all the substances originating from agricultural activities that are listed in the Pollutant Release and Transfer Register , e.g. greenhouse gases and substances that cause air pollution, such as ammonia and fine particles. The methods used to calculate the emissions are in accordance with international guidelines. The emissions are calculated using the National Emission Model for Agriculture (NEMA), which is developed in the Netherlands. For example, the NEMA is used to calculate the emissions from stables, manure storages and the application of manure. It is also used to calculate emissions, such as methane, from various animals and manure. The model is updated annually to reflect the latest scientific insights. This time around, the methods used for different substances as well as the implemented adjustments have been described. This time around, among other things, the so-called emission factors for certain low-emission stables have been modified. New insights show that more nitrogen is released from stables than was previously thought. The emission factor for emissions from the fertilisation of grassland, on the other hand, is lower. The emission data is available to the public via the website emissieregistratie.nl. It is used for reports that are mandatory under international treaties such as the Kyoto Protocol, the EU Emission Ceilings (NEC Directive) and the Convention on Long-range Transboundary Air Pollution (CLRTAP). This report also forms the basis for the reviewers who validate the Dutch reports to the European Union and the United Nations.