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I don't understand the calculations to find the answers, the OSHA charts don't read the same as what the teacher

is asking. Advice and direction would be greatly appreciated.

Calculate the exposure concentration in mg/m3 for the aerosols.

Calculate the exposure in parts per million (ppm) for the vapors.

  Hazard Analytical Result Volume (Time)

   Manganese Fume

5 µg

30 L (15-minute)

   Copper Fume

140 µg

960 L (8-hour)

   Lead Fume

40 µg

960 L (8-hour)

   1,2,4 trimethylbenzene

5 µg

48 L (8-hour)


125 µg

48 L (8-hour)


20 µg

48 L (8-hour)

   Metal Working Fluids

500 µg

720 L (8-hour)


The results for the noise sampling in the following table were recorded from your noise dosimeters. All the samples were collected for the full shift using 90 decibels on the A scale (dBA) as the criterion level and a 5 decibels (dB) exchange rate.

  Location Shift Length Result


8 hours

78.3 dBA (Lavg)

   Hydraulic Press

12 hours

93.0 dBA (Lavg)

   Metal Working Line

12 hours

84 dBA (Lavg)

   Robotic Welding

12 hours

80.5 dBA (Lavg)

   Hand Welding

12 hours

81.3 dBA (Lavg)

   Paint Booth

12 hours

79.5 dBA (Lavg)

   QA/QC Laboratory

8 hours

70.0 dBA (Lavg)

   Final Inspection

8 hours

73.5 dBA (Lavg)


Convert the results from dBA to percent.

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