国家环境空气质量标准 NAAQS ; National Ambient Air Quality Standard ; National Ambient Air Quality Standards
本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
环境质量标准、污染物排放标准分为国家标准和地方标准。
The environmental quality standards and pollutant discharge or emission standards are divided into state standards and local standards.
重点城市的空气和地面水达到国家规定的环境质量标准。
Air and surface water quality in major cities should meet both national and environmental quality standards.
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