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8. Face shield.(1) Footnote(1) Optional, as applicable. Part B. The types of hazards for which levels A, B, C, and D protection are appropriate are described below: I. Level A - Level A protection should be used when: The hazardous substance has been identified and requires the highest level of protection for skin, eyes, and the respiratory system based on either the measured (or potential for) high concentration of atmospheric vapors, gases, or particulates; or the site operations and work functions involve a high potential for splash, immersion, or exposure to unexpected vapors, gases, or particulates of materials that are harmful to skin or capable of being absorbed through the skin, Substances with a high degree of hazard to the skin are known or suspected to be present, and skin contact is possible; or Operations must be conducted in confined, poorly ventilated areas, and the absence of conditions requiring Level A have not yet been determined. II. Level B protection should be used when: The type and atmospheric concentration of substances have been identified and require a high level of respiratory protection, but less skin protection. The atmosphere contains less than 19.5 percent oxygen; or The presence of incompletely identified vapors or gases is indicated by a direct-reading organic vapor detection instrument, but vapors and gases are not suspected of containing high levels of chemicals harmful to skin or capable of being absorbed through the skin. Note: This involves atmospheres with IDLH concentrations of specific substances that present severe inhalation hazards and that do not represent a severe skin hazard; or that do not meet the criteria for use of air-purifying respirators. III. Level C - Level C protection should be used when: The atmospheric contaminants, liquid splashes, or other direct contact will not adversely affect or be absorbed through any exposed skin; The types of air contaminants have been identified, concentrations measured, and an air-purifying respirator is available that can remove the contaminants; and All criteria for the use of air-purifying respirators are met. IV. Level D - Level D protection should be used when: The atmosphere contains no known hazard; and Work functions preclude splashes, immersion, or the potential for unexpected inhalation of or contact with hazardous levels of any chemicals. 15