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Decisions to upgrade personal protection will be based on sustained <br /> breathing zone TOV that exceeds background levels. Breathing zone <br /> refers to the area from the top of the shoulders to the top of the head. <br /> Specific criteria for upgrading personal protection is based on TOV and <br /> has been established according to the carcinogenicity and teratogenicity <br /> of DBCP is presented in Table 2.. <br /> TABLE 2 CRITERIA FOR UPGRADING PERSONNEL PROTECTION <br /> Sustained Breathing <br /> (Zone TOV) Level of protection <br /> Background+1 ppm Level-D <br /> No respiratory protection <br /> Not Applicable Level-C <br /> Half-face air purifying respiratory <br /> equipped with organic <br /> vapor/HEPA cartridges <br /> Not Applicable Level-C <br /> Full face air purifying respirators <br /> equipped with organic <br /> vapor/HEPA cartridges <br /> Above 1 ppm Level-B <br /> Supplied air respirators <br /> 5-2 <br /> x <br />