One in eight deaths from pollution are attributed to fuel burned indoors for cooking—a common practice in the developing world.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/who-report-indoor-air-pollution-greatest-environmental-health-risk
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/national-geographic-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indoor-air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biomass
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/developing-countries
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/firewood
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lung-cancer
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heart-diseases
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asia
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe