
3M Personal Safety Division Regulations Update
Example #1: Assume the sampled mechanized mining unit (MMU) or designated area (DA) is on a /m3 dust standard. Suppose a valid representative dust sample with an equivalent concentration 3of mg/m contains % of quartz dust, which corresponds to a quartz concentration of 138 µg/ concentration exceeds the 100 µg/m3 limit for quartz.