In June 2020, the Danish parliament passed new legislation regarding low emission zones in Denmark. The Danish Environmental Protection Agency has the primary responsibility for enforcing the low emission zone rules, and Sund & Bælt collects vehicle data on behalf of the Danish Enviromental Protection Agency for use in deciding whether to issue a fixed-penalty notice.
In the five low emission zones, a number of checkpoints have been set up, where cameras use license plate recognition technology. The license plate data is compared to the data from vehicle registers in Denmark and abroad. Then it can determine whether vehicles driving in the low emission zone comply with the low emission zone rules.