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Emission of Smog Ingredients From Trees Is Increasing Rapidly |
| Section: NATURAL SCIENCE / SCIENCE AND SOCIETY |
| Author: By a United Press International staff writer |
| Publication: The world & I online |
| Issue Date: 2/1/2005 |
| Size: 955 Words, 6,347 Characters |
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Changes in U.S. forests caused by land-use practices may have inadvertently worsened ozone pollution, according to a study led by Princeton University scientists. The study examined a class of chemicals that are emitted as unburned fuel from automobile tailpipes and as vapors from industrial chemicals, but also which are emitted naturally from tree leaves. These chemicals, known collectively as VOCs (volatile organic compounds), react with other pollutants to form ozone, a bluish, irritating, and pungent gas that is a major form of smog in the lower atmosphere.
While clean-air laws have reduced the level of man-made VOCs, the tree-produced varieties have increased dramatically in some parts of the country, the study found. The increase stems from intensified tree farming and othe...
. . .
...etation."), the authors conclude: "The results reported here call for a wider recognition that an understanding of recent, current, and anticipated changes in biogenic VOC emissions is necessary to guide future air-quality policy decisions; they do not provide any evidence that responsibility for air pollution can or should be shifted from humans to trees."
© 2004 United Press International
(799 of 6,347 characters)
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