safe health level 安全保健水平
He points proudly at one of the screens, which shows that pollution in the city is better than the level considered to be safe by the World Health Organisation.
他非常骄傲地指着其中一个屏幕，屏幕上显示着在这个城市的污染水平比起世界健康组织界定的安全污染水平要好很多。
The level of human resource management plays a central role in the production of safe and effective health service in hospital.
医院人力资源管理水平的高低对医院能否产出安全有效的卫生服务有着重大影响。
The World Health Organization (WHO) considers PM2.5 readings of 25 micrograms per cubic metre as the maximum safe level.
世界卫生组织（WHO）将PM2.5每立方米25微克的指数认定为最大安全值。
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