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At 54% even in London, car-owning households are in the majority, and while the rules are to be tightened in cities including Birmingham and Leeds as well as the capital, for now it seems that telling unemployed parents off for being badly presented, or pregnant women for drinking, or fat people for being fat, are all more acceptable than asking the drivers of Britain’s 30m cars if sometimes, instead of driving, they might get on their bikes.
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http://www.theguardian.com/commentisfree/2016/feb/04/car-fumes-air-pollution-ban-motorists