Indoor air pollutants — caused by 'chulhas' for example — contribute to increased rate of respiratory diseases and low weight among newborns.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/indoor-air-pollution-cause-low-birth-weight-among-newborns-india-doctors
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indoor-air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rural-energy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/firewood
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-council-medical-research-icmr
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chulhas-cookstoves