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Big-City Problems In The National Parks

Yosemite_and_Half_Dome.jpg
Thomas Wolf, www.foto-tw.de, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=60192449
/
Yosemite National Park.

Our national parks are supposed to be places left in something like their original state.  But the fact that so many people visit them, and in warm seasons of the year, means air pollution is on the rise. 

A recent study found that ozone levels in national parks are on par with ozone levels in big U.S. cities. 

Which raises some issues about whether visits to the parks should be capped, or if vehicle traffic, the main source of ozone, should be sharply curtailed.  David Keiser at Iowa State University, the lead author of the study, is our guest.   
 

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Geoffrey Riley is a graduate of the University of Missouri School of Journalism and has hosted the Jefferson Exchange on JPR since 2009. He's been a broadcaster in the Rogue Valley for more than 35 years, working in both television and radio.