New research shows that ozone concentrations at Carlsbad Caverns National Park frequently exceed Environmental Protection Agency health standards, likely due to oil and natural gas development in the Permian Basin and surrounding region. New research shows that ozone concentrations at Carlsbad Caverns National Park frequently exceed Environmental Protection Agency health standards, likely due to oil and natural gas development in the Permian Basin and surrounding region. Earth Sciences Environment Phys.org – latest science and technology news stories