What substance is considered a contributor to indoor air pollution due to its widespread use in households?

Formaldehyde is widely recognized as a significant contributor to indoor air pollution primarily due to its common presence in various household products and materials. It is frequently found in items such as furniture, pressed wood products, paint, and many building materials. When these products are used or during temperature changes, formaldehyde can be released into the air, leading to elevated concentrations indoors.

This compound is particularly concerning because it can cause a range of health issues, including respiratory problems and irritation of the eyes and throat. The pervasive use of products containing formaldehyde in many homes leads to its accumulation within indoor environments, making it a key contributor to the deterioration of indoor air quality.

Household cleaners may also contribute to indoor air pollution, but they tend to vary widely in their composition, and not all are harmful. Fresh air, while benefiting indoor environments by diluting pollutants, does not contribute to indoor air pollution. Carbon dioxide, although a byproduct of human respiration and various household activities, is generally not classified as an indoor air pollutant to the same extent as formaldehyde.