Employer obligations under the new Respirable Crystalline Silica standard for construction (Title 8, section 1532.3) of the California Code of Regulations, were scheduled to commence on June 23, 2017. However, Cal/OSHA will not enforce those obligations until September 23, 2017. This synchronizes with federal OSHA's plan to delay enforcement of their corresponding standard. Unlike federal OSHA, 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, already 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. Per Title 8 section 5204, all employer obligations, except as otherwise stated in the standard, commenced on June 23, 2018.
The California Air Resources Board has an updated emissions estimate calculator for 2016-2021 calendar years. See: https://www.arb.ca.gov/cc/semiconductors/calculator/calculator.htm
Revised requirements for Prop 65 Clear & Reasonable language on warning labels will be effective August 30, 2018. See: https://oehha.ca.gov/proposition-65/crnr/notice-adoption-article-6-clear-and-reasonable-warnings for the legal information, and https://oehha.ca.gov/media/downloads/crnr/side-sidearticle6090116.pdf for a side-by-side comparison of the changes
... And finally, FYI for you Harley Riders. The EPA and the DOJ announced a settlement with Harley-Davidson, Inc., that requires them to stop selling and to buy back and destroy illegal tuning devices that increase air pollution from their motorcycles, and to sell only tuning devices that are certified to meet Clean Air Act emissions standards. See: https://www.epa.gov/enforcement/harley-davidson-clean-air-act-settlement