Question 1 
What two main factors make an air pollutant emitted indoors usually much more serious from a health standpoint than when the same quantity of pollutant is emitted outdoors?

Question 2
Explain why the definition of exposure presented in this chapter can apply to both human and nonhuman species plants and animals and even to inanimate objects, such as buildings. Give several examples of nonhuman targets besides those mentioned in this chapter.

Question 3:
Suppose a woman takes a multi-vitamin pill containing 10 mg of zinc. The volume of the pill is 200 mm^33. What is the exposure concentration of zinc in mg/mm^3 and in mg/m^3? Please show all work.