A new Portland State University study shows that even though water quality has improved in South Korea's Han River basin since the 1990s, there are still higher-than-acceptable levels of pollutants
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/study-finds-room-improvement-south-koreas-polluted-river-basin
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/phys
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution-control
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-korea
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/freshwater-ecosystems
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-quality