有害物质的英语是 "hazardous substances"。它们可以来自自然界，也可以是人为制造的。下面是一些例句：

The waste disposal facility is responsible for safely disposing of hazardous substances.

废物处理设施负责安全处理有害物质。

The workers were exposed to hazardous substances while cleaning the chemical spill.

工人在清理化学泄漏时接触了有害物质。

The company is required to label all containers of hazardous substances in the warehouse.

公司被要求在仓库中标记所有装有害物质的容器。