Chennai: Sucking in carbon dioxide and replacing it with oxygen is not the only contribution of plants.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/trees-can-clear-dust-reduce-noise
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/trees
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-monoxide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests