According to officials at the Environmental Protection Agency (EPA), the air inside buildings is typically the safest as it is free from pollution.

Question

Quizplus · Accepted Answer

While it is true that indoor air can be cleaner than outdoor air in some cases, it is not necessarily true that it is always free from pollution. Indoor air can be contaminated by a variety of sources including mold, gases such as radon, and volatile organic compounds (VOCs) emitted by products such as cleaning supplies and furniture.

According to Officials at the Environmental Protection Agency (EPA), the Air