南水北调西线工程地处青藏高原，输水线路长达320 km，超长隧洞修建时的施工通风问题尤为突出，现阶段没有高原隧洞施工环境的卫生标准。高原低压、缺氧环境下采用平原地区的隧洞环境卫生标准，势必对施工作业人员的健康产生极大影响，针对高原气候特点，结合国内外隧洞卫生标准，提出了高原条件下隧洞施工环境主要卫生标准，为南水北调西线工程施工提供借鉴。

 West Route of SouthtoNorth Water Transfer Project, located on QinghaiTibet Plateau, has a 320kmlong water transfer route. The construction ventilation of the extralong tunnels of the project is a great concern. So far there is no health standards available in China dedicated for the construction environment in tunnels on high plateaus. If the health standards for tunnels on plain were adopted for tunnels on high plateaus, where the atmospheric pressure is low and the oxygen is insufficient, the health of the workers would be jeopardized. Health standards for the construction environment in tunnels on high plateaus are proposed on basis of the climatic characteristics of high plateaus and the existing health standards for tunnels specified in Chinese and foreign specifications. The proposed health standards can provide reference for the construction of tunnels on West Route of SouthtoNorth Water Transfer Project.