Which statement about VOCs is true?

VOCs, or volatile organic compounds, are indeed harmful chemicals found in a variety of household items, such as paints, cleaning products, and air fresheners. These compounds can easily evaporate at room temperature, leading to their presence in the air we breathe indoors. Exposure to VOCs can cause a range of health issues, including respiratory problems, headaches, and even long-term effects on the liver and nervous system. Understanding the prevalence and impact of VOCs is crucial for maintaining a safe and healthy indoor environment, highlighting the importance of proper ventilation and the use of low-VOC products when possible.

The other statements do not accurately reflect the nature of VOCs. They do not improve indoor air quality; rather, they can degrade it. VOCs are commonly found in indoor settings rather than being limited to outdoor environments, and they are not used for cooling homes but rather are byproducts of various chemical processes used in household products.