ANSWER: According to the Environmental Protection Agency, people spend about 90 percent of their time indoors. This means that health risks related to indoor air quality -the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants - may be greater than those caused by outdoor air pollution. In many cases, indoor air quality can be so poor that it causes people to feel sick or contract an illness, contributing to increased absences and lower productivity.
展开▼
