Monitoring data showed the Air Quality Index in most parts of the capital reached 500, the maximum pollution level, on Sunday, the third consecutive day of severe smog.
监测数字显示，周日，首都北京大部分地区的空气质量指数均达到500，即污染程度的最高上限，北京的雾霾天气已持续三天。
When determining air demand for tunnel ventilation, the air demand is taken from the bigger one between calculation of CO concentration index and smog concentration index.
隧道通风需风量的确定是取CO浓度指标和烟雾指标计算出来的较大者作为需风量。
When determining air demand for tunnel ventilation, the air demand is taken from the bigger one between calculation of CO concentration index and smog concentration index.
隧道通风需风量的确定是取CO浓度指标和烟雾指标计算出来的较大者作为需风量。
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