In a situation where you expect to encounter airborne hazardous substances but do not need skin protection, the appropriate level of full-body protection is Level C. Level C protection is used when airborne contaminants are known, and respiratory protection is required, but skin hazards are not significant enough to require full-body encapsulation. This level typically includes an air-purifying respirator (such as a full-face air-purifying respirator) and chemical-resistant clothing that provides less skin protection than Levels A or B, which are used when skin protection is necessary

. To clarify the differences:

• Level A : Highest respiratory and skin protection (fully encapsulating suit and SCBA) - used when skin exposure is a risk

• Level B : High respiratory protection but less skin protection than Level A - used when respiratory hazards are high but skin contact is less likely

• Level C : Moderate respiratory protection (air-purifying respirator) and minimal skin protection - suitable when airborne hazards exist but skin protection is not needed

• Level D : Minimal protection, typically work clothes - not suitable when airborne hazards requiring respiratory protection are present

Therefore, when airborne hazardous substances are expected but skin protection is not needed, Level C PPE is the correct choice.