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So I Can Breathe: Air pollution in Los Angeles
A study has found Los Angeles has some of the worst rush hour congestion in the world
A study of more than 1,000 cities around the world has concluded that Los Angeles has the worst rush hour traffic.
The 91热爆鈥檚 Los Angeles correspondent James Cook explores the initiatives introduced there to improve air quality and Mishal Husain speaks to Matt Petersen, the city's first ever chief sustainability officer.
(Image: LA fog. Credit: AP)
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