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Emissions Control & Environmental Compliance Flashcards

7 cards from real ABA 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. OSHA's permissible exposure limit (PEL) for occupational noise over an 8-hour workday is:

    Answer: 90 dBA

    OSHA sets the 8-hour TWA PEL at 90 dBA using a 5 dB exchange rate; exposures at or above this level require engineering or administrative controls.

  2. Under OSHA's Hearing Conservation Amendment, employers must implement a hearing conservation program when worker noise exposure reaches or exceeds a TWA of:

    Answer: 85 dBA

    The OSHA action level is 85 dBA TWA; at this level employers must provide audiometric testing, hearing protection devices, and training even though it is below the PEL.

  3. OSHA defines a standard threshold shift (STS) as an average shift of how many dB at 2000, 3000, and 4000 Hz compared to the baseline audiogram?

    Answer: 10 dB

    An STS is a 10 dB or greater average change in hearing threshold at 2000, 3000, and 4000 Hz, which triggers re-evaluation and enhanced hearing protection.

  4. Under OSHA 29 CFR 1910.95, a baseline audiogram must be obtained within how many months of a new employee's enrollment in the hearing conservation program?

    Answer: 6 months

    OSHA allows up to 6 months for the baseline audiogram, provided the employee wears hearing protection devices during that interim period.

  5. According to OSHA, audiometric testing in a hearing conservation program must be performed by or under the supervision of a:

    Answer: Licensed or certified audiologist, otolaryngologist, or physician

    OSHA requires occupational audiograms to be conducted by or under the direct supervision of an audiologist, otolaryngologist, or physician.

  6. NIOSH's recommended exposure limit (REL) for occupational noise differs from OSHA's PEL primarily in that NIOSH recommends:

    Answer: 85 dBA with a 3 dB exchange rate

    NIOSH recommends 85 dBA REL using the 3 dB equal-energy exchange rate, which is more protective than OSHA's 90 dBA PEL with a 5 dB exchange rate.

  7. OSHA requires employers to notify workers in writing of a confirmed persistent standard threshold shift within:

    Answer: 21 days of confirming the shift

    OSHA mandates that workers be notified in writing within 21 days of a confirmed STS determination, and HPD adequacy must be re-evaluated.