OSHA Silica Dust Permissible Exposure Limit News & Opinion

What is the OSHA Silica Dust Permissible Exposure Limit (PEL)?


The OSHA Silica Dust Permissible Exposure Limit (or PEL) went into effect on September 23, 2017. It gives businesses guidelines regarding permissible exposure limits for silica dust inhalation on a job site. The diminutive nature of those limits may surprise you.

Quick Article Summary

  • New compliance date September 23, 2017
  • PEL reduced from 250 micrograms per cubic meter of air over an 8-hour shift to 50 micrograms
  • Over 620,000 construction workers exposed to more than the 50 mg limit

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The Original 2016 OSHA PEL Reduction

A big change occurred in 2016. OSHA updated the respirable crystalline silica Permissible Exposure Limit (PEL) affecting the construction, manufacturing, and fracking industries. The PEL had been an average of 250 micrograms per cubic meter of air over an 8-hour shift. The 2016 OSHA Silica Dust Permissible Exposure Limit reduces that average exposure limit to 50 micrograms per cubic meter. There are at least 1.86 million construction workers exposed to respirable crystalline silica with an estimated one-third exposed to more than 50 micrograms per cubic meter.

What is Silica Dust?

Crystalline quartz, the most common form of silica, is a component of sand, stone, rock, concrete, brick, block, and mortar. One of the oldest known workplace hazards is silica dust inhalation. Chipping, cutting, drilling, and grinding materials that contain crystalline silica releases respirable crystalline silica particles into the air. The dust penetrates the lungs, stomach, and bones and results in silicosis and cancer. It’s also hazardous to inhale wood dust.

OSHA's New Silica Dust Permissible Exposure Limit

OSHA Silica Dust Permissible Exposure Limit: Prevention and Control

There are several ways to prevent dust particle inhalation. Protective respirators and dust masks prevent direct inhalation. Don’t eat in areas where the dust could settle and don’t expose food or tobacco products to dust. Be sure to wash your hands and face after dust exposure before eating. It’s also wise to park in areas where dust can’t settle on vehicles.

Equipment can also limit dust exposure. Bosch (who put together the infographics for this article) offers Speed Clean Bits as part of a comprehensive system that reduces dust while producing precise, clean holes in concrete. The system, also includes dust vacuums, dust shrouds, and dust collection attachments. It not only helps you hit those OSHA PEL limits, but it also reduces silica dust in construction zones.

In short, three overarching methods exist to prevent and control silica dust inhalation:

  1. Wet methods that supply water right where silica dust is made by saws, drills, etc
  2. Dust extraction or other ventilation that removes silica dust at or near the point of production
  3. Enclosures that isolate the work process and/or the worker

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2020 Updates with Respect to Complying with the OSHA PEL for Silica

Employers have needed to be in compliance with all requirements of the OSHA PEL for silica dust standard by June 23, 2018. Upcoming dates and regulations include the following:

  • Employers must offer medical surveillance to employees exposed at or above the action level for 30 or more days a year starting on June 23, 2020. (As of June 23, 2018, employers must offer medical surveillance to employees exposed above the PEL for 30 or more days a year)
  • Hydraulic fracturing operations in the oil and gas industry must implement dust controls to limit exposures to the new PEL by June 23, 2021.

The Bottom Line

The 2016 OSHA Silica Dust Permissible Exposure Limit (or OSHA PEL) reduces silica dust exposure from 250 to 50 micrograms per cubic meter of air. Expect new tools and accessories, like hollow core drill bits, and preventative measures to make their way to safety managers and job sites soon.

If OSHA’s new silica dust permissible exposure limit affects your industry, please be sure to take the required steps to reduce the chances of crystalline silica dust inhalation. If you’re a Pro, how do you manage dust for you and your crew? Tell us about it in the comments below—or join the conversation on Facebook, Twitter, and Instagram!

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Brian Miller

Permissible exposure limit? Just say that no dust is allowed. It would be easier that way.

Mike Treen

I have left a few notes on the empty n95 shelf at the box store regarding needing masks for actual construction

C StMBS

So this study has been in the works for 20 years, now people want to make it political?

tho r

How many trump supporters are going to effected by this.