PPM = Inhalation Hazard.

• A. Inhalation hazard
• B. Temperature hazard
• C. Radiation hazard
• D. Contact hazard

Answer: (A)

Parts per million (ppm) is a way to express how much contaminant is present in the air by volume. This concentration measure directly relates to inhalation hazard because it tells you how much of a toxic gas, vapor, or aerosol a person could breathe in. The higher the ppm, the greater the potential for inhalation injury, since breathing in that concentration can produce health effects. PPM is specifically about airborne concentration, not about how hot or cold the material is (temperature hazard), how much energy or radiation it emits (radiation hazard), or how it might affect you through skin contact (contact hazard). So when you see ppm, you’re looking at the inhalation risk. For example, a leak of a hazardous vapor at a measured ppm level signals the need for respiratory protection and proper ventilation to reduce inhalation exposure.