Name of the city which become 1st City in the world to use Pollution Charge Zone.

London (capital city of the UK) is the first city in the world to implement a 24-hour, seven day a week Ultra Low Emission Zone (ULEZ), inside which vehicles will have to meet tough emissions standards or face a charge. Introduction of the ULEZ aims to reduce toxic air pollution and protect public health, according to a press release from the office of Sadiq Khan, mayor of London. Vehicles are responsible for around half of harmful nitrogen oxide air emissions in the British capital.