Diesel vehicles will be removed from Paris, Mexico City, Madrid and Athens by 2025, as part of unprecedented effort by mayors to improve the quality of air for their citizens. These pioneering cities also pledged to incentivise alternative vehicles and promote walking and cycling infrastructure. The market-shifting commitment was made today at the C40 Mayors Summit in Mexico City. Worldwide, 3 million deaths each year are linked to exposure to outdoor air pollution according to WHO, with the vast majority of these deaths occurring in cities.

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Photo credit: tim (Flickr)