The most effective exposure control for occupational hazards is elimination (A), as it removes the hazard completely from the environment.

Hierarchy of Controls (OSHA & ISO 45001):

Elimination (A) – Completely removes the hazard, eliminating risk.

Engineering Controls (C) – Creates barriers but does not eliminate the hazard.

Administrative Controls (D) – Reduces exposure through policies but does not remove the hazard.

Personal Protective Equipment (B) – A last resort; only protects the worker, not the hazard source.