India’s sporting ambition gets stronger by the day. It will host the 2030 Commonwealth Games and is bidding for the 2036 Olympics, amid dreams of gold medals and proposals of world-class infrastructure projects. Grand sporting spectacles and freeze-frames of the nation’s young standing proud on podiums are healthy markers of national aspiration. But India’s big dreams are in danger of turning foggy because of the toxic air that hangs over its sporting hubs. At the India Open badminton tournament in New Delhi last week, a top international player pulled out because of the capital city’s exceptionally high levels........

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