The proposed rule would require employers to conduct air
monitoring in work areas where there is reason to suspect silica
exposure may exceed 25 micrograms per cubic meter of air as an
eight-hour, time-weighted average. If exposures exceed the
permissible exposure limit of 50 micrograms per cubic meter of air,
employers are required to use engineering controls and work
practices to reduce the exposures unless using these controls is
infeasible or creates greater hazards.
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