Description: <span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">Points showing number of ozone exceedance days recorded in national parks with on-site monitoring (January-May 2024). An exceedance day occurs when the daily maximum 8-hour ozone average is 71 parts per billion (ppb) or higher.</span>
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