Given the following exposures to individual contaminants and their respective PELs, what is the combined exposure...
Given the following exposures to individual contaminants and their respective PELs, what is the combined exposure if the contaminants are considered additive?
Contaminant Exposure (mg/m3) PEL (mg/m3)
X 150 500
Y 225 500
Z 175 500
Is the PEL for the mixture exceeded?
Homework Answers
The combined exposure is calculated by relating the exposure of each pollutant between its PEL, if the sum of these relationships is greater than 1, it exceeds:
(150/500) + (225/500) + (175/500) = 1.1
It is greater than 1, then the PEL of the mixture is exceeded.
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