Under new rules introduced April 8, polluting vehicles will be discouraged from entering the ULEZ thanks to a daily charge of £12.50 (around $16) for some cars, vans and motorbikes and £100 ($130) for trucks, buses and coaches. The zone will cover the same area as the existing Congestion Charge -- collected from drivers in the city center -- until 2021, when it will be expanded to cover the area between the major orbital roads known as the North and South Circular.

London gets world's first 24-hour air pollution charge zone