It is possible to have a particulate filter retrofitted if your vehicle is affected by the regulations for driving in low emission zones.

The specific regulations for retrofitting particulate filters for vans are laid down in  

The regulations are written in Danish.

The specific regulations for retrofitting particulate filters for lorries and buses are laid down in

The regulations are written in Danish.

Before the declaration is presented at the vehicle inspection facility, the declaration must be emailed to the Danish Environmental Protection Agency at miljozoner@mst.dk. The Danish Environmental Protection Agency will then assign an identification number, which the owner or user must affix to the declaration.