NAAQS (National AmbientAirQualityStandards) 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。
2
The reference for formulating Chinese environmental qualitystandards is provided by analyzing the formulating procedure and process on ambientairquality standard in EC.