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Total Ozone Estimated Exceedances in Reporting Arizona Counties

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Visualization Notes:

Maricopa County has the highest number of ozone exceedances by a large margin over other counties in Arizona. This is a result of actual ozone exceedances along with the higher number of monitoring stations in Maricopa County. Hot, dry cities are especially prone to high levels of ozone, which is created when heat causes a chemical reaction between substances from vehicle exhaust and industrial emissions.