Global Air Quality An Imperative for Long-Term Observational Strategies (2001) / Chapter Skim
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The Effects of Changing Global Atmospheric Composition on Air Quality
The Effects of Changing Global Atmospheric Composition on Air Quality
Pages 14-19
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From page 14... ...
The following is a discussion about some of the current and possible future effects of cross-border and intercontinental transport of air pollutants, with an emphasis on assessing the potential implications for U.S. air quality.
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From page 15... ...
Analysis of ozone data from U.S. air quality monitoring networks reveals that the low end of the ozone probability distribution has been increasing over the past two decades, which investigators attribute to rising levels of background pollution transported from outside the United States (tin et al., 2000~.
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From page 16... ...
In this study it was also estimated that the current Asian contributions to episodic ozone events over the western United States are in the range of 3-10 ppb, and that future ozone episodes along the U.S. west coast could have Asian contribution as high as 40 ppb (based on a "worst case" emission scenario wherein Asian NOX emissions increase by a factor of four from 1990 to 2020~.
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From page 17... ...
The "A" scenarios represent materially oriented development, whereas the "B" scenarios involve a transition to information and service-oriented economies. The "1" scenarios represent globally oriented development, and the "2" scenarios represent locally and regionally oriented development.
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From page 18... ...
It should be emphasized, however, that alternatives to this high-end emission scenario do not lead to such large-scale air quality changes. Moreover, although all models predicted significant responses of ozone to changes in precursor emissions, estimates of the overall magnitude and geographical distribution of these impacts varied widely.
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From page 19... ...
THE EFFECTS OF CHANGING GLOBAL ATMOSPHERIC COMPOSITION 19 stratosphere and the impacts of climate and land-use change on biogenic emissions of ozone precursors. Nevertheless, these studies illustrate that changes in air pollution emissions occurring over the next several decades could potentially have impacts far beyond the regions in which they are emitted, and that in the 21St century, a global perspective may be needed to meet regional air quality objectives.
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