Last year, the World Health Organization named New Delhi the world's most polluted city. Twelve other Indian cities ranked among the world's most polluted 20.On Sunday, most of the city's government-run air monitors were showing "very poor" readings, providing an extra challenge for the more than 30,000 people taking part in the annual half marathon.
Still, the event proceeded in a carnival atmosphere, with Ethiopia's Birhanu Legese and Kenya's Cynthia Limo winning the men's and women's elite categories, respectively.
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