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Rickshaws travel along a road shrouded in smog in New Delhi, India, on Monday, Jan. 11, 2016. A 2-judge Delhi High Court panel headed by Chief Justice G. Rohini allowed the odd-even traffic restrictions to continue. The measure by Delhi Chief Minister Arvind Kejriwal is the most concerted effort by the government yet to reduce the number of exhaust-belching automobiles in the world's most polluted metropolitan area as discontent among the city's 16.8 million residents grows. Photographer: Prashanth Vishwanathan/Bloomberg via Getty Images

Rickshaws travel along a road shrouded in smog in New Delhi, India, on Monday, Jan. 11, 2016. A 2-judge Delhi High Court panel headed by Chief Justice G. Rohini allowed the odd-even traffic restrictions to continue. The measure by Delhi Chief Minister Arvind Kejriwal is the most concerted effort by the government yet to reduce the number of exhaust-belching automobiles in the world's most polluted metropolitan area as discontent among the city's 16.8 million residents grows. Photographer: Prashanth Vishwanathan/Bloomberg via Getty Images