NEW DELHI — An Indian court has banned all vehicles older than 15 years from the streets of the capital, New Delhi, in a bid to clean up air that one prominent study this year found to be the world's dirtiest. The ruling hits up to a third of the 8.4 million motorbikes, trucks, cars and auto-rickshaws that ply the traffic-choked roads of Delhi and its surrounding areas, transport officials estimate. Cities across the world are ordering older vehicles off the road or restricting private car use to tackle growing air pollution. Mexico City introduced a ban on older vehicles driving on Saturdays this year, while in March, France briefly enforced the most drastic traffic curbs in 20 years. “It is undisputed and in fact unquestionable that the air pollution of ... Delhi is getting worse with each passing day,” the National Green Tribunal ruled in a judgment last week banning older vehicles from city streets. – Reuters