<span style="color: #222222;">Local sources of pollution such as traffic, construction and domestic heating contribute significantly to the Delhi National Capital Region's high concentrations of harmful air pollutants. </span><br />” <br />” <span style="color: #222222;">A new comprehensive study from the University of Surrey in UK said, that given the dominance of local sources, efforts to control pollution are needed throughout the year and not just during winters, when the problem reaches its peak.<br />” <br />” The researchers said, according to the World Health Organisation (WHO), air pollution is estimated to cause nearly 4.2 million premature deaths worldwide in 2016. They said in India, around 600,000 deaths annually are attributed to air pollution, and some of the world's highest levels can be found in Delhi city.<br />” <br />”<br />”The study, published in the journal Sustainable Cities and Society, gathered four years of pollution data from 12 sites across Delhi, Haryana and Uttar Pradesh.</span><br />