What is the primary role of local exhaust ventilation (LEV) in protecting workers from hazards?

• A. It increases ambient exposure to monitor air quality.
• B. It is only used for liquid spills.
• C. It captures contaminants at or near the source, reducing ambient exposure.
• D. It eliminates all hazards completely.

Answer: (C)

Local exhaust ventilation is designed to remove hazardous substances right where they’re produced. A hood or enclosure is placed close to the source, and a fan draws air through ductwork to filtration or to exhaust. By capturing the contaminant at the point of release, it prevents it from entering room air and reaching workers’ breathing zones, thereby lowering ambient exposure. This engineering control is a main part of reducing hazards, but it doesn’t eliminate every risk on its own; proper design, placement, and maintenance are essential, and it’s not limited to liquids or spills.