What Are The World's Cleanest Cities?

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As environmental concerns grow, cities around the world fight to keep their air clean. So where are the world's greenest cities?

Learn More:
Smog in China closes schools and construction sites, cuts traffic in Beijing
"Much of the Chinese capital shut down Tuesday after Beijing's city government issued its first red alert for pollution, closing schools and construction sites and restricting the number of cars on the road."

The Green City Index
"More than half of the world's people now live in cities and the figure will rise to more than two thirds by 2050, according to United Nations forecasts."

How Curitiba's BRT stations sparked a transport revolution - a history of cities in 50 buildings, day 43
"Rua Padre Anchieta, as one of the main thoroughfares in Curitiba, Brazil, is a logical focal point for the city's bus network."

Music Track Courtesy of APM Music: "Elevation"

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