A thick blanket of smoke is seen against the setting sun as young ragpickers search for reusable material at a garbage dump in New Delhi, India, Friday, Oct. 17, 2014. India launched the Air Quality Index Friday to measure air quality across the nation that is home to some of the most polluted cities in the world. It will measure eight major pollutants that impact respiratory health in cities with populations exceeding 1 million in the next five years and then gradually the rest of the country, Environment Minister Prakash told reporters. The World Health Organization said earlier this year that the Indian capital had the worst air quality in the world, surpassing Beijing, a statement that New Delhi has vehemently disputed. (AP Photo/Altaf Qadri), APTOPIX