In Europe there was a shift around 2010 from CO2 to NOx. Before the shift there was an influx of tiny cars with tiny diesel engines which had emissions <= 99gr

In Europe there was a shift around 2010 from CO2 to NOx. Before the shift there was an influx of tiny cars with tiny diesel engines which had emissions <= 99grams CO2 / km. Now it's NOx all around. In fact, The Netherlands has limited daytime speeds on highways to 100km/h vs 120/130km/h just for this purpose.