High Resolution Characterization of Ozone Data for Sites Located in Forested Areas of the United States |
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| Authors: | Allen S Lefohn John E Pinkerton |
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| Institution: | 1. A. S. L. &2. Associates , Helena , Montana , USA;3. The National Council of the Paper Industry for Air and Stream Improvement, Inc. , New York , New York , USA |
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| Abstract: | Eight years of ambient monitoring data (1978-1985) were used to characterize O3 concentrations in eight forested areas of the United States. The analysis focused on the annual number of occurrences of hourly averaged O3 concentrations ≥0.07, 0.08, and 0.10 ppm during the growing season (April-October) as well as during the early (April-June) and late (July-October) portions of the growing season. On the average, within those areas studied, elevated O3 concentrations occurred more often in the Piedmont/Mountain/Ridge-Valley and Ohio River Valley areas than elsewhere. In the eastern United States, 1978, 1980, and 1983 were generally the years with the most occurrences of elevated O3 concentrations. In these years, the later part (July-October) of the growing season experienced more elevated concentrations than the earlier part. The results presented in this analysis were used to develop recommendations for future O3 effects research with respect to forested areas and related exposure regimes. |
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