Respiratory Protection for Silica Dust Toolbox Talk

Respirable crystalline silica is generated during many construction activities, including cutting, grinding, drilling, crushing, coring, and demolishing concrete, brick, stone, and masonry materials. Engineering controls such as water suppression and local exhaust ventilation should always be the primary methods used to reduce airborne silica dust. When these controls alone do not adequately reduce exposure, appropriate respiratory protection is required as determined by the employer's exposure assessment and respiratory protection program.

This toolbox talk reviews the proper selection, use, inspection, and maintenance of respirators used to protect workers from respirable crystalline silica.

Why This Matters

• Respirable crystalline silica can cause silicosis, lung cancer, chronic obstructive pulmonary disease (COPD), and kidney disease.
• Silica dust particles are extremely small and often cannot be seen with the naked eye.
• Respirators help reduce inhalation exposure when required, but they do not eliminate the hazard.
• Improper respirator use can significantly reduce the level of protection provided.
• Respiratory protection is most effective when combined with engineering controls and safe work practices.

Common Hazards

• Performing silica-generating work without required respiratory protection.
• Using the wrong type of respirator for the exposure.
• Poor respirator fit caused by incorrect sizing or facial hair interfering with the face seal.
• Damaged respirators, filters, valves, or straps.
• Removing respirators while still inside silica exposure areas.
• Improper cleaning, storage, or maintenance of reusable respirators.
• Relying on respirators instead of implementing required engineering controls.
• Continuing work after dust control equipment has failed.

Safety Checklist

Before Work Begins

• Identify tasks that may generate respirable crystalline silica.
• Verify engineering controls such as water suppression or local exhaust ventilation are operating properly.
• Wear the respirator required by the employer's exposure assessment and respiratory protection program.
• Inspect the respirator, filters, straps, valves, and facepiece before each use.
• Complete required fit testing, medical evaluations, and user seal checks in accordance with the respiratory protection program.
• Replace damaged or defective respirators and filters before beginning work.

During the Workday

• Wear the respirator continuously whenever required during silica-generating work.
• Do not modify, remove, or bypass respirator components.
• Continue using engineering controls throughout the task.
• Leave the exposure area before removing your respirator.
• Report respirator damage, breathing resistance, poor fit, or equipment problems immediately.
• Clean, inspect, and store reusable respirators according to the manufacturer's instructions and company procedures after use.

Crew Talking Points

• Which tasks today require respiratory protection?
• What engineering controls are being used in addition to respirators?
• How do you perform a user seal check before entering the work area?
• When should respirator filters or cartridges be replaced according to company procedures or the manufacturer's instructions?
• What should you do if your respirator becomes damaged or no longer fits properly?
• Speak up immediately if you notice excessive dust, respirator problems, or ineffective dust control measures.

Stop Work If

• Required respiratory protection is unavailable, damaged, or cannot be used correctly.
• Engineering controls are missing, damaged, or not functioning properly.
• Airborne silica dust cannot be effectively controlled.
• Your respirator no longer provides an adequate seal or becomes difficult to use safely.
• Workers are performing silica-generating tasks without the required exposure controls.
• You are unsure how to safely perform the assigned silica-generating task.

Final Reminder

Respiratory protection is an important part of controlling silica exposure, but it should always be used together with engineering controls and safe work practices. Inspect your respirator before each use, ensure it fits properly, wear it whenever required, and report any equipment or exposure concerns immediately. Protecting your lungs today helps protect your health for years to come.