The _________ and other agency bodies provide exposure information for chemicals, biologicals, radiation, and changes in climate, land and water use.

• A. National Exposure Research Laboratory
• B. Integrated Risk Information System (IRIS)
• C. Environmental Protection Agency
• D. Office of Research and Development

Answer: (A)

Exposure information is what helps us understand how people and ecosystems come into contact with environmental agents, including chemicals, biologicals, radiation, and how changes in climate, land, and water use alter those exposures. The National Exposure Research Laboratory is the EPA unit that specializes in generating and providing this kind of exposure data and methods, drawing from field measurements, experiments, and modeling to cover chemicals, biologicals, radiation, and environmental change. That focus on measuring and characterizing actual exposures is why it’s the best fit. The other options don’t provide exposure data in the same way: IRIS is a hazard-value database, not a primary source of exposure information; the Environmental Protection Agency is the overarching agency; and the Office of Research and Development is a broader EPA division rather than the specific lab responsible for exposure science.