OSHA recently published to help employers control exposure to respirable crystalline silica at construction sites. 

The new fact sheets provide information for employers and workers who operate handheld grinders, angle grinders, jackhammers, rotary hammers, stationary masonry saws, handheld masonry saws or vehicle-mounted drilling rigs.

For more information, visit OSHA's and read OSHA's educational publication on (PDF).