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The EPA defines the AQI median as "Half of daily AQI values during the year were less than or equal to the median value, and half equaled or exceeded it." Undefined AQI represents no data from the EPA.
Hover over a county!
The EPA defines the AQI median as "Half of daily AQI values during the year were less than or equal to the median value, and half equaled or exceeded it." Undefined AQI represents no data from the EPA.