Abstract
Long‐term trends in summertime ground‐level ozone—smog that is formed through a series of chemical reactions between nitrogen oxides and volatile organic compounds (VOC) in the presence of sunlight—decreased significantly in the United States′ three largest metropolitan areas—New York, Los Angeles, and Chicago between 1980 and 1995—according to a report published in the January 20 issue of AGU's Journal of Geophysical Research.Researchers from Harvard University, who used data from the nearly 900 ozone monitoring sites in the United States Environmental Protection Agency's nationwide network, also found that despite an estimated 60% increase in vehicle miles traveled during the study period, no significant regional increases in ozone were recorded.
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