卫生防护距离，是从产生职业性有害因素的生产单元（生产区、车间或工段）的边界至居住区边界的最小距离。
在氮肥厂环境评价中，确定卫生防护距离是非常必要的，而相关的研究、介绍却较少。
It is very necessary to determine the health protection zone in environmental impact assessment for nitrogenous fertilizer plant, but the research and introductions are less.
卫生防护距离的确定对于新建工业企业的选址和现有工业企业的环境管理起着至关重要的作用。
Determination of health protection zone is crucial for selecting the site of new industrial enterprises and environment management of existing industrial enterprises.
采用地面浓度反推法，计算出氨的无组织排放量，从而确定出可行的大型氮肥厂卫生防护距离。
The discharge of uncontrollable ammonia was determined by the antiinferenee of ground consistency. A practical and feasible health protection zone was determined.
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