国家环境空气质量标准 meaning in English
naaqs
national ambient air quality standards
Examples
- At the same time , cities in the region will generally meet the relevant national air quality objectives except for certain time periods and monitoring stations
同时，除个别时段及部分监测点外，区内各城市将基本达到适用的国家环境空气质量标准，区内烟雾现象亦会明显改善。