OSHA Updates Silica Dust Rule - First Time since 1971

March 24, 2016


is an occupational lung disease caused by inhaling of crystalline silica dust. Silicosis inflames and scars tissue in the lungs. The scars take the form of and is marked by inflammation and scarring in the form of fluid-filled nodules (bumps) in the upper lobes of the lungs. Acute Silicosis is characterized by shortness of breath, cough, fever, and cyanosis (bluish skin). Complications can lead to lung cancer.

Construction jobs where silica dust may be found:

Mining, sandblasting, quarry, rock crushing and concrete mixing, demolition, grinding, fracking, brickmason, tunneling operations

“This rule will save lives. It will enable workers to earn a living without sacrificing their health", said U.S. Secretary of Labor Thomas E. Perez. “More than 80 years ago, Labor Secretary Frances Perkins identified silica dust as a deadly hazard and called on employers to fully protect workers. This rule builds upon decades of research and a lengthy stakeholder engagement process – including the consideration of thousands of public comments – to finally give workers the kind of protection they deserve and that Frances Perkins had hoped for them.”

About 2.3 million men and women face exposure to respirable crystalline silica in their workplaces, including two million construction workers who drill and cut silica-containing materials such as concrete and stone, and 300,000 workers in operations such as brick manufacturing, foundries and hydraulic fracturing. Most employers can limit harmful dust exposure by using equipment that is widely available – generally using water to keep dust from getting into the air or a ventilation system to capture dust where it is created.
The final OSHA rule improves worker protection by:

  • Reducing the permissible exposure limit for crystalline silica to 50 micrograms per cubic meter of air, averaged over an eight-hour shift.
  • Requiring employers to:
                Use engineering controls (such as water or ventilation) and work practices to limit worker exposure;
                Provide respiratory protection when controls are not able to limit exposures to the permissible level;
                Limit access to high exposure areas;
                Train workers;
                Provide medical exams to highly exposed workers.
  • Providing greater certainty and ease of compliance to construction employers – including many small employers – by including a table of specified controls they can follow to be in compliance, without having to monitor exposures.
  • Staggering compliance dates to ensure employers have sufficient time to meet the requirements, e.g., extra time for the hydraulic fracturing (fracking) industry to install new engineering controls and for all general industry employers to offer medical surveillance to employees exposed between the PEL and 50 micrograms per cubic meter and the action level of 25 micrograms per cubic meter.

The final rule is written as two standards, one for construction and one for general industry and maritime.  

Construction Deadline: June 23, 2017

Employers covered by the revised  construction standard have until June 23, 2017 to comply with most requirements. Employers covered by the general industry and maritime standard have until June 23, 2018 to comply with most requirements; additional time is provided to offer medical exams to some workers and for hydraulic fracturing employers to install dust controls to meet the new exposure limit.

OSHA estimates that when the final rule on Occupational Exposure to Respirable Crystalline Silica becomes fully effective, it will save more than 600 lives annually and prevent more than 900 new cases of silicosis – an incurable and progressive disease – each year. The agency also estimates the final rule will provide net benefits of about $7.7 billion per year.

Image: Museomed