In the UK, the introduction of Ultra Low Emission Zones (ULEZ) and Clean Air Zones (CAZ) has been rolled out in key cities. With more to follow suit in the coming months.
The hope for these zones is to reduce pollution. Mainly by discouraging the use of old and more polluting vehicles. This is particularly true of city centres. Where there are the most pedestrians.
Early research into this has begun to show promising results.
Understanding Emission Standards
The ULEZ in London requires vehicles to meet specific emission standards.
If they do not, the owner is required to pay a daily charge.
For diesel cars, the required standard is Euro 6. While petrol cars and vans must meet the Euro 4 standards