Which of the following is a common indoor source of air pollution?

Household cleaning products are a significant indoor source of air pollution because they often contain volatile organic compounds (VOCs) that can evaporate into the air and contribute to indoor air quality issues. When these products are used, they can release various chemicals that may irritate the respiratory system, cause headaches, or lead to other health problems, especially in poorly ventilated spaces. Common examples of such products include sprays, detergents, and air fresheners.

In contrast, forests, traffic emissions, and outdoor vegetation primarily influence outdoor air quality rather than indoor environments, making them less relevant in the context of indoor air pollution sources. Forests and outdoor vegetation may improve air quality by absorbing carbon dioxide and other pollutants, while traffic emissions are linked to outdoor air contaminants. Hence, household cleaning products stand out as a prominent contributor to indoor air pollution.