Bengal has more than 27 highly polluted areas, including one in the heart of the city.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/lead-pollution-high-bengal-says-jairam
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-kolkata
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolkata
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lead
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mercury
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pesticides
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ganga
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste