1. Urban Population Growthhttp://www.who.int/gho/urban_health/situation_trends/urban_population_growth_text/en/#
2. World Bank Tasa de Crecimiento de la Poblaciónhttp://www.worldbank.org/depweb/spanish/modules/social/pgr/print.html
3. WHO Website. Climate Change and Healthhttp://www.who.int/mediacentre/factsheets/fs266/en/
4. WHO Website. Ambient (Outdoor) Air Quality and Healthhttp://www.who.int/mediacentre/factsheets/fs313/en/
5. WHO Website. 7 Million Premature Deaths Annually Linked to Air Pollutionhttp://www.who.int/mediacentre/news/releases/2014/air-pollution/en/