Four of the world’s biggest cities are taking an unprecedented step to battle pollution

Some of the biggest urban-pollution headlines of the past few years haven’t come from likely suspects like Beijing and New Delhi, but rather once-pristine European cities: Paris. Athens. Madrid. Now those three capitals, plus notoriously polluted Mexico City, are taking action by getting rid of all diesel vehicles by 2025. They will be the first major cities to enact such a ban, according to a statement released at the C40 Mayors Summit in Mexico City.
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