MySafetySign Blog

Could silica protection finally enter the 21st century?

Silica dust can be a deadly occupational hazard for many workers, including those who perform concrete repair. (Photo by U.S. Navy Mass Communication Specialist 2nd Class Gary A. Prill.)

Since February 2011, a proposal that would better protect workers from crystalline silica dust – a known carcinogen – has sat in the White House’s Office of Information and Regulatory Affairs. Although the review – required by law – is not to exceed 90 days, and although the proposal merely updates 1970 standards, it received little attention.

But the two-year anniversary of its submittal has sparked awareness, anger and an increased push for its passage from lawmakers, occupational health advocates and labor unions.

Crystalline silica naturally occurs in soil, sand and granite, and workers in industries such as construction, hydraulic fracturing (“fracking”), metal-casting, and brick, pottery, glass and concrete manufacturing can be exposed to high levels of silica dust by cutting, grinding, drilling, chipping or blasting materials that contain it.

Even limited inhalation can cause silicosis – a build-up of scar tissue in the lungs, which is incurable and often fatal. Inhalation also increases a worker’s risk of developing tuberculosis and renal and autoimmune diseases, according to the Occupational Safety & Health Administration (OSHA).

In the proposal, OSHA calls to cut worker’s permissible exposure limit (PEL) to silica dust in half – saying that the current limit for general industry dates back to a 1968 formula, and the PEL for construction and shipyards was derived in 1970 and “based on particle-counting technology which is considered obsolete.”

The standard would also expand on the various precautions required of employers and workers, by enforcing stricter housekeeping requirements (such as the use of local exhaust ventilation), and implementing medical surveillance and exposure monitoring requirements.

The proposed OSHA standard would add monitoring requirements to the existing precautions for silica dust. (Image via

All of the details of the proposal – and the reasons that it’s now been pending for more than 800 days – have received fresh attention over the past several months: