Description: <p><span style="font-family:"Arial",sans-serif; color:#4C4C4C; background:white;">Points showing number of ozone exceedance days recorded in
national parks with on-site monitoring (January-May 2023). An exceedance day
occurs when the daily maximum 8-hour ozone average is 71 parts per billion
(ppb) or higher.</span><o:p></o:p></p>
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