Conclusion: measurement of the concentration of dust inside the building, E3B measurements were found to be lower than the standard OSHA (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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