New tests carried out by the Associated Press have found that the waters around Rio de Janeiro are heavily and dangerously contaminated, even 1Km out to sea.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tests-find-olympic-water-rio-de-janeiro-heavily-polluted-raw-sewage
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-business-times
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brazil
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/games
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wastewater-treatment