OSHA and employers can continue to use theĭorr-Oliver cyclone to evaluate compliance against the final PEL of 50 µg/m 3. Would depend on the cyclone and flow rate used. The minimum recommended air volume isĤ00 L and the maximum is 1000 L. Respirable dust method to include any sampler designed to meet the Method 7500 also allowsįor the use of an aluminum cyclone at 2.5 L/min. Of 1.7 L/min for the Dorr-Oliver 10-mm nylon cyclone and 2.2 L/min for
Have also adopted the ISO/CEN convention with flow rate specifications NIOSH sampling and analysis methods for crystalline silica ( Method 7500, Method 7602, Method 7603) The OSHA Action Level is the same as the ACGIH TLV-TWA of 0.025 mg/m 3 for respirable quartz and cristobalite. Therefore, employees with 8-hour TWA exposures at or above the OSHA Action Level of 25 µg/m 3 should be included in Limits may be hazardous to workers, even when the exposure levels are That exposures above some of these alternative occupational exposure OSHA recommends that employers consider using theĪlternative occupational exposure limits because the Agency believes With other selected occupational exposure limits, such as the ACGIH Recognizes that many of its PELs are outdated and inadequate forĮnsuring protection of worker health. OSHA Action Level and the OSHA PEL-TWA, specific requirements of the OSHA RespirableĬrystalline Silica standards for General Industry and Construction are
Indicate that employee exposures to crystalline silica exceed the Silica at or above the OSHA Action Level. Or may reasonably be expected to be exposed to respirable crystalline Initial air monitoring is necessary to identify those employees who are
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