Official sources indicate that emissions from A-tractors may be much larger than known because the vehicles lack exhaust cleaning requirements. The only previous measurement showed that particle emissions from A-tractors can be up to 1,000 times greater than from regular cars, highlighting potential environmental concerns. However, the exact emission levels of A-tractors compared to other vehicles remain unclear, and it is unknown how many A-tractors are currently in use and what their overall environmental impact is.
A research project is currently underway in Linköping at the Swedish National Road and Transport Research Institute to carefully measure emissions from A-tractors. According to SVT Nyheter, a researcher described the effort as aiming to find out what the emissions from A-tractors look like, noting there is very little knowledge about it, so measurements are taken directly in the exhaust during driving. The findings could inform future policies, but what regulatory changes, if any, are being considered based on the research results has not been specified.