This paper presents a kind of measurement instrument for meteorologicalvisibility and lighting visibility using visible laser.
介绍了一种基于透射表原理的可见激光测量气象能见度和灯光能见度的仪器。
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The Beijing Meteorological Center on Sunday afternoon issued a code yellow alert to warn about fog in the capital, saying visibility would drop to less than 500 meters in most parts of the city.
北京气象中心周日下午发布了大雾黄色预警称，绝大部分地区的能见度将不足500米。
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The municipal meteorological station issued the city's first orange fog warning Sunday morning due to decreased visibility caused by the heavy smog.