The area should be free of major environmental health hazards such as malaria, onchocerciasis (river blindness), schistosomiasis (bilharzia), or tsetse fly.

• 安置点必须远离重大的环境健康威胁：如疟疾、盘尾丝虫病(河盲症)、血吸虫病(比哈西亚症)或者采采蝇(睡病蝇)。