吉尔吉斯斯坦梅鲁苏地区（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
印度拉尼贝特（Ranipet,India）
1.Tannery waste
2.containing hexavelent chromium
3.azodyes
4.consumptions of vehicles
5.consupmtions of plastic bags
伦敦(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