OSHA has proposed a revised silica regulation. Key changes include a reduction to the silica Permissive Exposure Level to 50 micrograms per cubic meter of air (50 μg/m3) as well as other engineering, administrative and PPE changes. Refer to OSHA for more information: https://www.osha.gov/silica/.
NIOSH and OSHA reference a paper published in Occupational Medicine supporting the silica causes lung cancer in humans. This supports the International Agency for Research on Cancer (IARC) 1997 classification of silica as a human carcinogen.
Contractors demolishing, repairing, installing, and maintaining concrete, brick, block or other silica containing materials may have a respirable silica exposure when these processes generate dust.
OSHA has released a new hazard alert outlining the significant silica hazards for workers involved in manufacturing, finishing, and installing natural and manufactured stone countertops. See the OSHA Hazard Alert for silica here: https://www.osha.gov/Publications/OSHA3768.pdf.