English ⇄ Chinese English Russian

national ambient air quality standards
earth.sc.	全国环境空气质量标准美国环境保护局
space	全国环境空气质量标准 (美国环保局)
National Ambient Air Quality Standards
auto.	美国家大气质量标准
environ.	美国国家环境空气质量标准
national ambient air quality standard
ecol.	国家环境大气质量标准
tech.	全国环境空气质量标准
wind.	国家环境空气质量标准
English thesaurus
National Ambient Air Quality Standards
abbr., oil	NAAQS (Federal standard that specifies the maximum allowable level, averaged over a specific time period for a certain pollutant in outdoor (ambient) air.)
transp., abbr.	NAAQS
National Ambient Air Quality Standard
ecol., abbr.	NAAQS

national ambient air quality standards: 2 phrases in 1 subject

Ecology

2