According to EPA studies of human exposure to air pollutants, the indoor levels of pollutants may be two to five times higher than outdoor levels.

Question

Quizplus · Accepted Answer

EPA studies have shown that indoor levels of pollutants can be higher than outdoor levels due to factors such as poor ventilation and the use of certain products that release pollutants. This can lead to negative health effects for individuals who spend a significant amount of time indoors.

According to EPA Studies of Human Exposure to Air Pollutants