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能见度对航空、航海等交通安全和研究大气污染等方面具有重大意义,对民航机场尤为重要,它是决定机场开放或关闭的一个极为重要的气象要素,也是飞行的气象标准之一。据统计,建国以来因气象原因引起的民航客机机毁人亡的重大
Visibility is of great significance to traffic safety in aviation and navigation, research on air pollution and so on. It is particularly important to Civil Aviation Airport. It is an extremely important meteorological element that determines the opening or closing of an airport. It is also one of the meteorological standards for flight. According to statistics, since the founding of the People’s Republic of China due to weather caused by civil aircraft crash machine major