A project to study the impact of pollution on the acoustic quality of birds is being undertaken at the National Zoological Park.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pollution-affecting-birds-sound-du-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/migratory-species
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-security
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/zoos
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment