CURRENT AUSTRALIAN STANDARDS
The Australian standard for airborne crystalline silica states a mandatory limit of 0.1mg/m3 over an eight hour shift.
The OSHA crystalline silica rule §1926.1153 for the United States of America revises the amount of crystalline silica a worker should be exposed to:
The permissible exposure limit will be set at 50 micrograms per cubic meter of air, averaged over an eight hour shift.
Employers will be required to take measures to control silica, either through using water, dust collection systems, ventilation or providing respirators.
Employers will also be required to limit the amount of time a worker can be exposed to hazardous environments, write an exposure control plan, designate a competent person, offer medical exams to highly exposed workers and train workers on the risks and how to avoid silica dust.
By following the suggestions of the US OSHA standards you can further reduce your crystalline silica dust exposure to less than the current Australian standard.