Remote emission sensing campaigns carried out in three European cities under the CARES project between 2021 and 2022 revealed that average real-world vehicle nitrogen oxides (NO_x) emissions decreased with the introduction of the Pre-RDE Euro 6 standard, dropping from 0.7 g/km to 0.3 g/km for diesel vehicles. However, vehicle emissions continue to exceed type-approval limits, with measurements from the campaigns for both Euro 5 and pre-RDE Euro 6 standards averaging nearly 4 times the respective limit values. Euro 5 diesel vehicles tended to exhibit more extreme measurements, with emissions from some manufacturers between 7 and 8 times the type-approval limit. In contrast, emissions of petrol vehicles were found to generally be closer to the type-approval limits.