Take a deep breath.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/nowhere-hide-city-poison-air
[2] http://admin.indiaenvironmentportal.org.in/category/author/jayanta-basu
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/telegraph-kolkata
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0