World Health Organization (WHO) reported (2014) : “25 March 2014 | Geneva - In new estimates released today, WHO reports that in 2012 around 7 million people died - one in eight of total global deaths – as a result of air pollution exposure. This finding more than doubles previous estimates and confirms that air pollution is now the world’s largest single environmental health risk. Reducing air pollution could save millions of lives” (World Health Organization (WHO), “7 million premature deaths annually linked to air pollution”: http://www.who.int/mediacentre/news/releases/2014/air-pollution/en/ ).