Consider the following observed concentrations of air contaminants:
$\begin{array}{lcc}
&\text { TWA } &\text { PEL } \
\text { Isopropyl ether } & 200 \mathrm{ppm} & 500 \mathrm{ppm} \
\text { Ethyl benzene } & 40 \mathrm{ppm} & 100 \mathrm{ppm} \
\text { Chlorobenzene } & 25 \mathrm{ppm} & 75 \mathrm{ppm} \
\text { Chlorobromomethane } & 50 \mathrm{ppm} & 200 \mathrm{ppm}
\end{array}$
Perform calculations to determine whether this atmosphere exceeds the PEL, the AL, or both.

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The Answer of Consider the following observed concentrations of air contaminants:
$\begin{array}{lcc}
&\text { TWA } &\text { PEL } \
\text { Isopropyl ether } & 200 \mathrm{ppm} & 500 \mathrm{ppm} \
\text { Ethyl benzene } & 40 \mathrm{ppm} & 100 \mathrm{ppm} \
\text { Chlorobenzene } & 25 \mathrm{ppm} & 75 \mathrm{ppm} \
\text { Chlorobromomethane } & 50 \mathrm{ppm} & 200 \mathrm{ppm}
\end{array}$
Perform calculations to determine whether this atmosphere exceeds the PEL, the AL, or both.

Consider the Following Observed Concentrations of Air Contaminants Perform Calculations to Determine Whether This Atmosphere Exceeds the PEL