New Delhi, with its sprawling metropolitan region of 30 million residents, is regularly ranked among the world’s most polluted capitals. Acrid smog blankets the skyline each winter, when cooler air traps pollutants close to the ground, creating a deadly mix of emissions from crop burning, factories and heavy traffic. Here are some pictures from the Indian capital today. A man moves his boat through foam on the polluted Yamuna river, on a smoggy morning amid ongoing air pollution in New Delhi, India, on November 21. — Reuters A fisherman uses a string to catch fish through foam on the polluted Yamuna river, on a smoggy morning amid ongoing air pollution in New Delhi, India, on November 21. — Reuters Boats move through foam on the polluted Yamuna river, on a smoggy morning amid ongoing air pollution in New Delhi, India, on November 21. — Reuters A fisherman on a boat stands next to a fishing net covered with foam, on the polluted Yamuna river, on a smoggy morning amid ongoing air pollution in New Delhi, India, ...