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.
这个城市的空气质量实在是太差了！污染指数那么高，以至于我们都已不再希望于外出时戴防毒面具保护自己了。
The air quality in this city is horrendous. The pollution levels are so high that we are not supposed to go outside with a face mask again!
并论证这种空调系统的优点是节能、经济、保护大气环境、改善室内空气质量及气候。
It shows that the advantages of this system are energy saving, air environment protection, amelioration of indoor air quality and climate.
洛克风石棉板有助于改善室内空气质量，进一步保护工人的健康和安全。
Further protecting workers' health and safety, ROCKFON's stone wool ceiling panels help improve IAQ in offices.
BGI采样器将为美国环保署提供相应的空气质量数据，保护环境和当地居民。
BGI samplers will provide the EPA with data to monitor the ambient air quality to protect both the environment and population.
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.
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.
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