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目前,美、英、法、西德等国有一种意见,认为小于5～7微米的微粒对肺有选择性作用,因而他们对环境空气中的5～7微米的粉尘微粒实行检查;别的一些国家在规定粉尘标准时亦已注意到粉尘的细小微粒部份。因此,研究粉尘大小对于呼吸器官病理过程的不同作用,已作为一个迫切的问题,引起了广泛注意。 研究不同大小的粉尘微粒对呼吸器官的作用,开始于木世纪20年代。已经查明,环境空气中粉尘微粒的性能,在很大程度上取决于它的大小,吸入气溶胶的危险程度,取决于其分
At present, the United States, Britain, France, West Germany and other countries have a opinion that less than 5 ~ 7 microns of the particles have a selective role in the lungs, so they are 5-7 micron ambient air dust particles to be checked; other Some countries have also noticed the fine particle fraction of dust when setting dust standards. Therefore, studying the different effects of dust size on the pathological process of respiratory organs has drawn a lot of attention as an urgent issue. Studying the effect of dust particles of different sizes on respiratory organs began in the 1920s. It has been ascertained that the performance of dust particles in ambient air depends largely on its size and the degree of risk of inhalation of aerosols depending on its fraction