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The article I find is Indoor Air Pollutants and Toxic Materials, which agrees that more and more scientific evidence in the last several years has indicated that the “air within homes and other buildings can be more seriously polluted than the outdoor air. (Chapter 5) Moreover, according to article, “if not enough outdoor air is brought in to dilute emissions from indoor sources and to carry indoor air pollutants out of the home”, the levels of air pollutant in the home increase. In addition, high temperature and humidity levels are another reason that increases the concentration of some pollutants. (Chapter 5) I think this is an important issue because with the growing economy, people pay more attention on their living environment, so they spent more money on house decoration and appliances; however, these objects contain a lot of environmental air pollutants, which lead to toxic threat risk for human. This article explains that some kinds of air pollution exist in our homes and impact us. For example, carbon monoxide is a colorless, odorless gas that can cause sudden illness and death, it is often due to heating and cooking equipment, and the most common symptoms of CO poisoning are dizziness, headache, vomiting, nausea, weakness, chest pain, and confusion. Then ozone, which is created by ion generators or the exposure of polluted air to sunlight or ultraviolet light emitters, if consumer inhaling it that can damage the lungs. Small amounts of ozone will bring about coughing, shortness of breath, chest pain, and throat irritation. Carbon monoxide is a serious problem, especially for children, who will be hurt more seriously and have worse symptoms than adults. “Ozone can also exacerbate chronic respiratory diseases such as asthma.” (Chapter 5) So I hope people can be aware of what risk that exists in their rooms and what symptom these will cause in order to make preparation in advance and have the ability to protect them.