Several years back, OSHA revised their silica dust exposure regulations. They reduced the permissable exposure limit (PEL) by 5X what it originally was at 250 to 50 micrograms per cubic meter of air. Asphalt Contractor magazine wrote an article on some suggested ways to limit silica dust. Some of the items they suggested was putting a written plan in place, properly training your team. For operators of machines, some suggestions included enclosed, positive-pressurized cabs, checking air filters, and the use of a wetting agent to the sweeper water supply.

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