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3. The presence of incompletely identified vapors or gases is indicated by a <br />direct -reading organic vapor detection instrument, but vapors and gases are <br />not suspected of containing high levels of chemicals harmful to skin or <br />capable of being absorbed through the skin. <br />[NOTE: This involves atmospheres with IDLH concentrations of specific substances <br />that present severe inhalation hazards and that do not represent a severe skin <br />hazard; or that do not meet the criteria for use of air -purifying respirators.] <br />III. Level C --Level C protection should be used when: <br />1. The atmospheric contaminants, liquid splashes, or other direct contact will <br />not adversely affect or be absorbed through any exposed skin; <br />2. The types of air contaminants have been identified, concentrations <br />measured, and an air -purifying respirator is available that can remove the <br />contaminants; and <br />3. All criteria for the use of air -purifying respirators are met. <br />IV. Level D --Level D protection should be used when: <br />1. The atmosphere contains no known hazard; and <br />2. Work functions preclude splashes, immersion, or the potential for unexpected <br />inhalation of or contact with hazardous levels of any chemicals. <br />[NOTE: As stated before, combinations of personal protective equipment other than <br />those described for Levels, A, B, C, and D protection may be more appropriate and <br />may be used to provide the proper level of protection.] <br />As an aid in selecting suitable chemical protective clothing, it should be noted that the <br />National Fire Protection Association has developed standards on chemical protective <br />clothing, including: <br />NFPA 1991 --Standard on Vapor -Protective Suits for Hazardous Chemical Emergencies <br />(EPA Level A Protective Clothing) <br />Draft HMMP <br />March, 2000 <br />