Respirable Crystalline Silica Standard for Construction

Important Update

Employer obligations under the new Respirable Crystalline Silica standard for construction, found in the California Code of Regulations, Title 8, section 1532.3, commenced on June 23, 2017. Cal/OSHA began enforcing those obligations on September 23, 2017. During the first 30 days of enforcement, Cal/OSHA was available to assist employers that were making good faith efforts to meet the new standard, to ensure understanding and compliance. Effective October 23, 2017, Cal/OSHA is fully enforcing all appropriate provisions of the standard. This follows federal OSHA's approach regarding enforcement of their corresponding standard.

Please note: Cal/OSHA's new permissible exposure limit for respirable crystalline silica of 0.05 milligrams per cubic meter (0.05 mg/M3), found in Title 8 section 5155, Table AC-1, went into effect on October 17, 2016. In addition, employers must continue to meet the requirements of Title 8 section 1530.1 to control employee exposures to dust created by operations conducted on concrete or masonry materials.

Revised October 23, 2017