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1993年4月～9月我们对华北某地一条通风式坑道的空气卫生质量进行调查。1对象和方法1．1对象常年驻守坑道口或经常出人坑道的演练、维修保养人员。采样前数月坑道内无部队进驻。平时进出口敞开或间断性敞开，因风压及内、外温差作用，产生空气流动，形成自然通风换气。多数通道
From April to September 1993, we investigated the air hygiene quality of a ventilation tunnel in a place in North China. 1 objects and methods 1.1 objects stationed perennial pit mouth or constantly out of the tunnel exercises, maintenance personnel. Months before the sampling tunnel no troops stationed. Usually the import and export of open or intermittent open, due to wind pressure and internal and external temperature difference, resulting in air flow, the formation of natural ventilation. Most channels