Question

1. The National ambient air quality standard for sulfur dioxide is 180 μg/m3. Assuming a lifetime exposure (24 hr/day, 365 days/year) for an adult male of average body weight. What is the estimated lifetime CDI for this concentration? Assume the exposure duration equals the lifetime.

2. Find the concentration of polychlorinated biphenyls in drinking water that would result in a 10-6 risk for a 70-kg person who drinks 2L/day throughout his or her entire lifetime.​

Answer 1