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s.� <br /> r . <br /> r <br /> -� ETHYLENE DIBROMIDE <br /> Airborne Concentration <br /> of Ethylene Dibromide Respiratory Protection <br /> ky <br /> Background levels Level D <br /> ;tea 0 ppm to 20 ppm Level D <br /> 20 ppm to 160 ppm Level C <br /> t <br /> 160 ppm and above Level B <br /> , a <br /> - <br /> TOTAL ORGANIC VAPORS <br /> E <br /> f <br /> Airborne Concentration <br /> of Total Organic Vapors Respiratory Protection <br /> +•` <br /> Background levels <br /> �- Level D <br /> t <br /> Y <br /> " 0 ppm to 100 ppm (lowest TLV listed <br /> in Table 1,excluding benzene and <br /> ethylene dibromide) Level D <br /> 100 ppm to 800 ppm (40 percent of <br /> the lowest MLl-l.listed in Table 1, <br /> excluding benzene and ethylene <br /> -_ dibromide) Level C <br /> 800 ppm and above Level B <br /> Respiratory Protection Levels <br /> Level D Operations Requirements <br /> f:Y'M <br /> • No respiratory protection. <br /> E-3 <br /> 172.1910 3/4191 <br />