Radon poses the greatest potential health risk to people when it is:

a. contained in insulation material used in residential properties during the 1970s
b. found in high concentrations in unimproved land
c. trapped and concentrated in inadequately ventilated areas
d. emitted by malfunctioning or inadequately ventilated appliances


Answer: c. trapped and concentrated in inadequately ventilated areas

Environmental & Atmospheric Sciences

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