The chart shows the average number of days exceeding state and federal ozone standards and health advisory and episode levels for the years 1976-1995 for 17 stations in the Basin with complete data throughout the period. There has been a significant decrease in the average number of exceedances at all levels. The three-year average number of days exceeding decreased by 42% for the federal standard and 28% for the state standard between the years 1976-1978 and 1993-1995.
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