Comparing Exposure Results to OSHA's Limit
1926.1153(a), Scope and application, applies to all occupational exposures to respirable crystalline silica in construction work, where employee exposure averages 25 micrograms or more per cubic meter of air (25 μg/m3) over 8-hours.
It is important to know there is not one crystalline silica exposure limit for all cases. Rather, the limit is derived from a calculation that takes into account the percentage of quartz, cristobalite, tridymite, and respirable dust specific to your particular worksite.
OSHA regulation 29 CFR 1910.1000 Table Z-3 is used to determine the exposure limits for crystalline silica. Though this regulation is under the General Industry Standard, crystalline silica exposures in the Construction and Maritime Industries are subject to this same limit.
You can find more information on calculating the degree of exposure to which employees are exposed at OSHA’s Sampling and Analysis webpage.
Knowledge Check Choose the best answer for the question.
2-5. OSHA Standard 1925.1153 applies where employee exposure averages 25 micrograms or more per cubic meter of air _____.
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