In early March, Sweden's Transport Administration published a report indicating that the methodology for calculating emissions from road traffic had been updated, resulting in revisions to historical emissions data. However, a deeper explanation for the recalibration was not provided. Dagens Nyheter has now uncovered the significant details behind these adjustments.

An unpublished report commissioned from IVL Swedish Environmental Research Institute shows that the emissions of nitrous oxide from heavy diesel trucks are vastly larger than previously thought by authorities. For the year 2024 alone, the emissions from Swedish trucks have been revised from 216 tons to 1,744 tons, marking an increase of over 700%. This surge is attributed to the new technology implemented for truck exhaust purification that uses urea, known as AdBlue, to meet the EU's stricter regulations on harmful nitrogen oxides emissions.

While the use of AdBlue is beneficial for health by reducing harmful emissions, it has resulted in a significant increase in nitrous oxide emissions, which poses a threat to Sweden's ability to meet its climate obligations under EU regulations. This revelation raises concerns about the effectiveness of current emissions strategies and highlights the complexities involved in balancing public health with climate goals.