New Zealand dropped five spots to 19th place out of 176 nations in CNN . Denmark , Denmark , New Zealand , Sweden and Singapore topped the list as the cleanest countries . Somalia , North Korea , China , Sudan and Myanmar ranked at the bottom . In Europe , Greece -- whose ailing economy faces tough austerity measures to meet international standards to get bailout cash -- plummeted to 94th place on the list , down from the 80th spot last year . The United States was ranked 19th in the world , below Japan and the UK .
New Zealand dropped five spots to 19th place out of 176 nations in CNN . Denmark , Denmark , New Zealand , Sweden and Singapore topped the list as the cleanest countries . Somalia , North Korea , China , Sudan and Myanmar ranked at the bottom . The United States was ranked 19th in the world , below Japan and the UK .