bob体育官方平台，Four of world's biggest cities to ban diesel cars from their centres
The system will be based on a vehicle's licence plate - odd numbers will be allowed on the roads one day, even numbers the next.
Motor vehicles are considered a major source of pollution.
They include taking half of the city's four million private cars off the roads on days when there are serious levels of pollution.
There are exceptions to the ban, such as for mopeds, hybrid cars, those carrying three people or more or used by disabled people. Buses, taxis and emergency vehicles are also exempt.
on health grounds基于健康理由
China's capital, Beijing, has announced measures to combat worsening air pollution, state-run media report.
Cars drive on a motorway towards Madrid, Spain December 28, 2016