...境治理 关键词：美国，室内空气质量，室内空气污染，空气质量标准 [gap=502]Key Words: the United States, Indoor Air Quality, Indoor Air Pollution, Standards for Indoor Air Quality ..
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环境空气质量标准 environmental and air quality standards ; air quality standards ; ambient air quality ; [环境] ambient air quality standard
国家环境空气质量标准 NAAQS ; National Ambient Air Quality Standard ; National Ambient Air Quality Standards
室内空气质量标准 indoor air quality standard ; IAQS
全国环境空气质量标准 National Ambient Air Quality Standards ; NAAQS
人居环境空气质量标准 residential ambient air quality standard
空气质量和排放标准 air quality and emission standards
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.
空气质量标准州与州不同。
这结果至少超过了美国国家空气质量标准的4倍。
That's at least four times greater than exposure standards set by U.S. national air quality standards.
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