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Industrial Hygiene & Exposure Monitoring Flashcards

6 cards from real CESCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which organization publishes Threshold Limit Values (TLVs) used as guidelines for airborne chemical exposure in the workplace?

    Answer: American Conference of Governmental Industrial Hygienists (ACGIH)

    ACGIH publishes TLVs annually as voluntary exposure guidelines; OSHA uses legally enforceable Permissible Exposure Limits (PELs), which are different values.

  2. The hierarchy of controls for occupational hazards lists which method as the MOST effective way to protect workers?

    Answer: Elimination

    Elimination — physically removing the hazard from the workplace — is the most effective control because it permanently removes the risk rather than managing it.

  3. An 8-hour time-weighted average (TWA) exposure measurement is used to compare against which OSHA exposure limit type?

    Answer: Permissible Exposure Limit (PEL)

    OSHA PELs are 8-hour TWA values; STELs apply to 15-minute exposures and ceiling limits must never be exceeded at any instant.

  4. Noise-induced hearing loss is a permanent condition. At what OSHA action level (8-hr TWA) must employers implement a Hearing Conservation Program?

    Answer: 85 dBA

    OSHA's Hearing Conservation Amendment (29 CFR 1910.95) requires a hearing conservation program when employee noise exposure equals or exceeds 85 dBA as an 8-hr TWA.

  5. Which sampling method is used to determine personal airborne chemical exposure during a work shift?

    Answer: Personal breathing zone (lapel) sampling

    Personal breathing zone sampling, where a collection device is worn near the nose and mouth, best represents the air a worker actually inhales during a shift.

  6. What does the term 'biomonitoring' mean in the context of industrial hygiene?

    Answer: Measuring chemical concentrations in biological specimens such as blood or urine

    Biomonitoring assesses actual internal dose by measuring the chemical or its metabolites in biological specimens, reflecting absorbed exposure from all routes.