Radiation fog often forms in late fall and winter nights, especially in lower areas, because cold and heavy air moves downhill, and gathers in valleys.
辐射雾经常形式在深秋和冬天的夜晚，特别是在较低的地区，因为寒冷和沉重的空气流动下坡，并收集在山谷。
The electric tar-trapper was improved and perfected in all sides. The distinguished results of higher operation rate, small content of tar fog in gas and lower operation cost have got.
对于电捕焦油器系统进行了全面的改进和完善，取得了开工率高、煤气中焦油雾含量低、运行费用少的显著效果。
The total ion concentration in the snow water is much lower than that of the heavily polluted fog water observed in the Beijing area.
与污染较重的雾水相比，雪水中的诸离子浓度远低于北京地区雾水所测值。
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