April 7 is observed as the World Health Day. The aim and objective is to make the people aware about their health.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/rising-pollutions-pose-health-hazards
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/pioneer-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution