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Nội dung: <blockquote data-quote="tuan1990" data-source="post: 109981" data-attributes="member: 77737">[f=600]https://d3.violet.vn/uploads/previews/499/2153355/preview.swf[/f][f=600]https://d3.violet.vn/uploads/previews/499/2153430/preview.swf[/f][f=600]https://d3.violet.vn/uploads/previews/499/2153431/preview.swf[/f]7) Read the passage carefully and then answer the questionsIt is the environment in which we breathe that must have changed, and there is plenty of evidence that tells us it has. Plus, we also know that it is airborne pollutants and elements that usually cause asthma attacks and other respiratory problems. Most people believe it is the air outdoors that presents us with the greatest risk. However, it is actually the air inside our houses, schools, and other buildings that is most harmful. According to the Ainerican College of Allergies, 50% of all illnesses is aggravated or caused by polluted indoor air.Today's homes and buildings are built airtight, with energy-efficiency inside. Their airtight construction keep airborne pollutants trapped inside, nature's air cleansing agents outside. Is it any wonder that statistics for asthma problems began rising sharply around the same time that homes and buildings began to be built this way? In fact, a recent study found that the allergen level in super-insulated homes is 200% higher than it is in ordinary homes. Plus, according to Scientific America, a baby crawling on the floor inhales the equivalent of 4 cigarettes a day, as a result of the outgas of carpets, molds, mildews, fungi, dust mites, etc. Most people spend a lot of their time inside. In which case, indoor air is going to impact our health far more than outdoor air. Virtually, everyone is affected, especially asthmatics and others who are particularly sensitive to allergens and contaminants in the air. It is informed that 6 out of 10 houses and buildings are "sick", meaning they are hazardous to your health to occupy, as a result of airborne pollutants. In fact, every house and building is affected by the indoor air quality epidemic to one degree or another, regardless of how clean it may appear. Every home is filled with prime sources that contribute to mass quantities of airborne allergens and contaminants.</blockquote>

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