最近《今日美国》对全国学校附近的空气质量进行调查，挑出了那些在加州伯克利绿色小镇沾沾自喜的学校，人们的反应可想而知。
So you can imagine the reaction when a recent USA Today investigation of air quality around the nation's schools singled out those in the smugly green village of Berkeley, Calif.
根据环境保护部对全国338个城市的调查，2016年，只有四分之一的中国城市达到了国家的空气质量标准。
In 2016, only one fourth of Chinese cities met the country's air quality standards, according to a survey of 338 cities nationwide from the Ministry of Environmental Protection.
环保局说，现有的全国各地空气中铅的监测系统都还不够好—足以用来检测空气质量是否达到新的标准，他们将不得不重新设计。
The EPA said that the existing lead in air monitoring systems around the country are not good enough to detect whether air quality is meeting the new standard and they will have to be redesigned.
国家环境空气质量标准规定了全国的二氧化硫浓度限值来保护人民健康。
NAAQS (National Ambient Air Quality Standards) define attainment and protect human health by setting a limit on SO2 concentration nationwide.
本标准适用于全国范围的环境空气质量评价。
The standard is available for air quality assessment all of the country.
本标准适用于全国范围的环境空气质量评价。
The standard is available for air quality assessment all of the country.
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