The French capital has placed limits on the number of cars on its roads after suffering from the worst and most prolonged air pollution in at least 10 years.
Angela Merkel has pledged to unlock millions of euros in emergency funds to help clean up air quality in German cities. Authorities meeting at a "diesel summit" in Berlin are hoping to avoid a ban on diesel vehicles.
From rising sea levels to megastorms and drought, how five cities around the world will face their own struggles to adapt to a warming planet.
Dirty air resulted in the premature deaths of more than 500,000 people in the European Union in 2014, the European Environment Agency reports. Pollution needs to be reduced, agency heads and environmentalists agree.
Paris is set to ban all petrol and diesel-fueled cars by 2030. An official told French radio it was part of a long-term strategy to reduce greenhouse gases.
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