One of the primary causes of sick building syndrome is
A) high humidity.
B) lack of insulation.
C) poor ventilation.
D) formaldehyde in carpeting.
Question 2
The EPA and the Office of the Surgeon General recommend that homeowners test their homes for radon how often?
A) Every 6 months
B) Once a year
C) Every 2 years
D) Every 3 years