某卷烟厂具有50年生产史，现有职工402人，接尘工人312人。每年从10月份开始生产，至次年6月份截止，为季节性生产。该厂机械设备老化，防尘设备不够完善，作业环境中烟草粉尘浓度较大，对接尘工人的危害较重。现将本次调查结果报告如下。1二烟草粉尘浓度、粉尘分散度及粉尘中? A cigarette factory has 50 years of production history, the existing staff of 402 people, 312 workers dust. The production starts from October every year until the following June, which is seasonal production. The aging machinery and equipment plant, dustproof equipment is not perfect enough, the working environment, a greater concentration of tobacco dust, dust workers on the more serious harm. Now report the findings as follows. 1 two tobacco dust concentration, dust dispersion and dust?