Global Air Quality An Imperative for Long-Term Observational Strategies (2001) / Chapter Skim
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Introduction
Introduction
Pages 5-9
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From page 5... ...
These gases and particles are relatively short-lived, remaining in the atmosphere for only days to months near the surface. Ozone and PM are of particular concern because their atmospheric residence times are long enough to influence air quality in regions far from their sources and because they also contribute to climate change.
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From page 6... ...
pollutant emissions affect global air quality, and to develop realistic and effective air quality management plans for the coming decades. Answering the questions posed above requires a research strategy that integrates atmospheric observations covering a wide range of parameters and spatial and temporal scales together with diagnostic, global, and regional models (see Figure 1-1~.
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From page 7... ...
Predictions about air quality changes in the 21st century are highly uncertain, in part because of the limited observational record of changes in the atmospheric concentration of short-lived gases and aerosols since the pre-industrial era. Recent technical advances have greatly enhanced the possibilities for obtaining needed observations; the challenge now is to make a national commitment to developing and maintaining comprehensive observational programs that will utilize these technologies.
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From page 8... ...
Without this type of evaluation, our understanding will be incomplete and the value of model predictions will remain highly uncertain. For all of these reasons, a commitment to long-term observational strategies emerges as imperative for understanding global air quality changes in the 21st century.
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From page 9... ...
· Chapter 4 contains an analysis of our current capabilities for observing atmospheric chemical changes related to global air quality concerns. Chapter 5 contains the committee's key findings and recommendations.
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