烟雾指数
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。
It did not say when the photographs of clear blue skies were taken: days of heavy smog that were off the charts started in late November, producing levels beyond the measure of the air-quality index.
这些照片中的天空清澈湛蓝,拍摄时间没有披露:破纪录的重度雾霾从11月下旬就开始出现,其严重程度超出了空气质量指数的测量范围。
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