In 2004, 210 cities exceeded the Class 2 limit values of the National AmbientAirQualityStandard (NAAQS) within the total 342 monitored cities.
2004年,受监测的342个城市中有210个城市的空气质量超过了国家环境空气质量标准的二级标准。
2
The reference for formulating Chinese environmental quality standards is provided by analyzing the formulating procedure and process on ambientairqualitystandard in EC.
通过分析欧盟环境空气质量标准的制订过程,为我国环境质量标准的制订提供参考与借鉴。
3
From 2002 to 2004, the quality of ambientair in urban area of Qinzhou city reach national secondary standard.