Being the commercial and administrative capital cities of Sri Lanka Colombo and Sri Jayawardhanapura and their suburbs accommodate many industries, residences and commercial and administration institutions and infrastructure. As a result this urban area has become one of the most polluted areas in Sri Lanka.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/heavy-metal-pollution-drainage-network-colombo-city-and-suburbs-sri-lanka
[2] http://admin.indiaenvironmentportal.org.in/category/author/pradeep-n-ranasinghe
[3] http://admin.indiaenvironmentportal.org.in/category/author/y-p-shamalie-siriwardana
[4] http://admin.indiaenvironmentportal.org.in/category/author/vindya-r-wanasinghe
[5] http://admin.indiaenvironmentportal.org.in/category/journal/chinese-journal-geochemistry
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-metals
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drainage
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sri-lanka
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/colombo