A worker was stationed in an area where the concentration of lead was measured a

Question

A worker was stationed in an area where the concentration of lead was measured and found to be 157 micrograms of lead per cubic meter of air. The worker was wearing a MSA air-purifying half mask (half facepiece) respirator with dust and fume cartridges which had been modified to permit air sampling to be done inside the respirator. The level of lead inside the respirator was found to be 18 micrograms of lead per cubic meter of air. What is the actual protection factor for the respirator worn by this worker at this station? Select one: 10 33.4 0.11 50 8.7

Explanation / Answer

Actual Protection factor (APF) = (Concentration found in surrounding) / (Concentration actually exposed to)

So APF = 157/18 = 8.7

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