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  3. A useful definition of an air pollutant is a compound added directly or indi

A useful definition of an air pollutant is a compound added directly or indi

游客2025-03-25  15
问题     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled — a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.
    Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature.  As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis nature’s output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city.
    In this localized region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious (有毒的) chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0. 08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm. [br] The passage is mainly about ______.
选项 A、what constitutes an air pollutant
B、the serious impact of air pollution
C、how much harm air pollutants can cause
D、the effects of compounds added to the atmosphere
答案 A
解析 本题是主旨题。文中第一段讲述了人们对什么是空气污染物质的认识和理解一直在并且会继续发生变化。第二段讲述了自然界存在的空气污染物质以及它们在控制空气污染中的作用和数量。第三段讲述了在局部地区由于人的活动而产生的空气污染物的危害。因此四个选项中能正确概括文章大意的是A选项。
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