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"You'd need a car park a little bigger than Wales. If you'd like to know how much stuff is in the world's cars, or how much they emit in a year, watch this great little video from Carbon Visuals."

"Police in Paris set up checkpoints around the city on Monday to enforce a vehicle ban in an effort to cut dangerous pollution levels. All vehicles bearing even-numbered license plates are banned from driving in French capital for the day. The restrictions were introduced after pollutions levels reached dangerous levels for five days in a row"

Thanks largely to vehicle emissions, Mexico City was once the world's most polluted urban centre. But over the past decade, a focus on sustainable alternative transport has persuaded a growing number of citizens to leave their cars at home. A heavily subsidised underground network caters for 22m journeys daily, and conditions on the city's overcrowded roads have improved, with the metro bus system and the introduction of public bicycles contributing significantly to reduced pollution levels

"Eastern China's dangerous levels of air pollution blamed on coal burning, car exhaust, factories and weather patterns"

"Here, we look at two cities where, against the odds, efforts to promote sustainable living are emerging. The first is Iqaluit, a remote indigenous community in the Canadian Arctic that is entirely reliant on imported diesel for power yet at the same time is seeing climate patterns impact its traditional ways of life. The second is Johannesburg in South Africa, where efforts to promote alternatives to private car ownership are slowly bearing fruit. "

"Measures relaxed on Monday night after cars were ordered off streets of Santiago, businesses shut and 7 million residents told to stay indoors"