Final answer:
The Annual Limit of Intake (ALI) is the maximum amount of a substance that can be inhaled in a year without adverse health effects. Derived Air Concentration (DAC) is the concentration of a substance in the air that corresponds to the ALI.
Step-by-step explanation:
The Annual Limit of Intake (ALI) and Derived Air Concentration (DAC) are terms used in assessing the exposure to hazardous substances in the air. ALI represents the maximum amount of a substance that a person can inhale in a year without experiencing adverse health effects. DAC, on the other hand, is the concentration of a substance in the air that corresponds to the ALI.
For example, let's say the ALI for a specific substance is 10 milligrams. The DAC would then be the concentration of that substance in the air that, if inhaled continuously for a year, would result in an intake of 10 milligrams.