This is an old question that is no longer in use.
Images may be missing and the information may be dated.
Which engine emits the most harmful nitric oxides?
“Compared to a petrol driven car, a diesel car causes slightly higher emissions, primarily of nitric oxides” (Swedish Consumer Agency)
Körkortonline.se offers driving licence theory tests. This is an example of an explanation of a test question. English theory test (free demo), Swedish theory test (free demo) and Arabic theory test (free demo).
More examples of explanations: