吉爾吉斯斯坦梅魯蘇地區(qū)（Mailuu-Suu,Kyrgyzstan）
1.highly radioactive waste products
2.protoxide-oxide of uranium
3.high population density
4.other waste
5.contamination of the Mailuu-Suu River
印度拉尼貝特（Ranipet,India）
1.Tannery waste
2.containing hexavelent chromium
3.azodyes
4.consumptions of vehicles
5.consupmtions of plastic bags
倫敦(London)
1.the gas let out by vehicles
2.the frog which usually happens
3.large scale of industry
4.too crowded traffic
5.high pupulation density