Source Control

  • • Elimination
  • • Substitution
  • • Redesign
  • • Isolation
  • • Ventilation
  • • Lockout
  • • Automation

Control along the Path from the Hazard to the Worker

Hazards that cannot be isolated, replaced, enclosed, or automated can sometimes be removed, blocked, absorbed, or diluted before they reach workers. Usually, the further away a control keeps hazards from workers, the more effective it is.


A hazard can be blocked. For example, proper equipment guarding can protect workers from coming into contact with moving parts. Screens and barriers can block welding flash from reaching workers. Machinery lockout systems can protect maintenance workers from physical agents such as electricity, heat, pressure, and radiation.


Baffles can block or absorb noise. Local exhaust ventilation can remove toxic gases, dusts, and fumes where they are produced.


Some hazards can be diluted or dissipated, for example, general (dilution) ventilation.

Control at the Level of the Worker

Control at the level of the worker usually does not remove the risk posed by a hazard.

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