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Total Number of Ozone Days by County

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Visualization Notes:

This graph shows the number of days when any monitor in the county records an exceedance of the standard (0.075 ppm) for an 8-hour average. This measure helps to even out the discrepancy between counties with one or few monitors and those with many, such as Maricopa County.  Note that Maricopa County still shows the highest number of exceedance days, even when normalizing for the number of monitors.