Conclusion: measurement of the concentration of dust, dust and General access to and accumulated in the parenchyma of the Lung in the building are all measuring E3B 2 is a document printer (printer) Class 3 to class 4 and class 3 is a typical dust and dust form can be accessed and accumulated in parenchyma of lungs, one point and four have a dust and dust that can access and accumulated in parenchyma of lungs, one point has found a result lower than OSHA standard (Occupational Safety. And Health Administration) can't summarize which measurements inaccurate measurement result, it may come from a variety of causes, such as the temperature of the point scale filter paper dust, with temperatures at the point of measurement of the dust, then there is a different temperature, due to the humidity of the air affect the weighing of filter paper, so the result of the measurement of dust, so there is a negative value.
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