A new report by the International Council on Clean Transportation (ICCT) shows that the average amount of nitrogen oxides (NOx) present in exhaust emissions from modern diesel passenger cars is more than double the levels from modern trucks and buses.

The difference is attributable in large part to differences in how light-duty and heavy-duty vehicle emissions are regulated, and the contrasting performance highlights the importance of an upcoming decision on strengthening the real-driving emissions (RDE) test for passenger cars in the EU.