Carlsbad Caverns, White Sands rank in bottom 10 of national

A new study of 400 parks found some of the highest levels of ground-level ozone at the two New Mexico sites.

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Las Cruces , New Mexico , United States , White Sands , Ulla Reeves , John Vimont , National Park Service , National Park Service Air Resources Division , National Parks Conservation Association , Carlsbad Caverns , Air Resources ,