早在公元七、八世纪时,我们的祖先在生产实践中,对人类环境中有害因素与疾病的关系就有了认识。如对产生有毒气体的地点、浓度变动规律、测知方法以及消除措施,已开始有较系统的观察。明代伟大医药学家李时珍在《本草纲目》一书中, As early as the seventh and eighth centuries AD, our ancestors recognized the relationship between the harmful elements and disease in the human environment in their production practice. For example, the place where toxic gas is generated, the law of concentration variation, the method of detection and the elimination measure have begun to have a more systematic observation. Ming Dynasty great medical scientist Li Shizhen in “Compendium of Materia Medica,” a book,